Проектирование композитных конструкций произвольной формы /Design of freeform composite structures тема диссертации и автореферата по ВАК РФ 00.00.00, кандидат наук Москалева Анастасия Викторовна
- Специальность ВАК РФ00.00.00
- Количество страниц 173
Оглавление диссертации кандидат наук Москалева Анастасия Викторовна
Contents
1 Introduction
2 The state of the art
2.1 What are freeform structures?
2.2 Fiber reinforced polymer composites
2.3 Applications of FRP composites in freeform structures
2.4 Freeform structures created by using the geometric approach
2.4.1 What is the geometric approach?
2.4.2 Geometrical composite freeform structures: case studies
2.5 Freeform structures created by using the biomimetic approach
2.5.1 What is biomimetic approach?
2.5.2 Biomimetic composite freeform structures: case studies
2.6 Freeform structures created by using the form-finding approach
2.6.1 What is form-finding approach?
2.6.2 Numerical form-finding methods
2.6.3 Form-found composite freeform structures: case studies
2.7 Discussion and future trends
3 Composite freeform shell structures: design, construction and testing
3.1 Form-finding of the composite shell structure
3.2 Manufacturing of the composite shell structure
3.3 Mechanical testing of the composite shell structure
3.3.1 Testing of test coupons
3.3.2 Testing of prototype shells
3.4 Finite element analysis
3.5 Comparison of the structural behavior with other structural shapes
3.6 Discussion and outlook
4 Evolving design workflow: optimization of rib patterns for a freeform composite structure
4.1 Methods
4.2 Results
4.3 Discussion and outlook
5 Stiffening patterns for freeform composite shell structures
5.1 Design of rib patterns
5.2.1 Regular rib pattern
5.2.2 Biomimetic rib pattern
5.2.3 Cross-vault rib pattern
5.2.4 Topology optimized rib patterns
5.2 Manufacturing
5.4 Mechanical testing
5.5 Finite element analysis
5.6 Asymmetric loading scenarios
5.7 Integration of stiffening patterns
5.8 Discussion and future research
6 Conclusion
Acknowledgements
List of abbreviations
List of symbols
List of figures
List of tables
Bibliography
The author's publications on the dissertation topic:
Appendix A. Algorithm for post-processing of the Cross-vault and Optimization stiffening patterns, realized on the Grasshopper platform
Appendix B. Algorithm for generation of the Voronoi stiffening pattern, realized on the Grasshopper platform
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Введение диссертации (часть автореферата) на тему «Проектирование композитных конструкций произвольной формы /Design of freeform composite structures»
1 Introduction
The pursuit of freeform shell structures, or complex geometry shells with double curvature, is driving advancements at the intersection of structural engineering and modern design innovation. In the realm of construction, a primary goal is the deployment of progressive building constructions that minimize material consumption and labor while reducing both the cost and duration of building projects. As international experience has shown over recent decades, among the most progressive are shell structures, known for their efficiency in roofing systems for various types of buildings. These structures not only contribute to the creation of buildings with a distinct architectural identity but also address significant spatial challenges. Nonetheless, their construction requires a calculated approach leveraging the latest advancements in structural mechanics. The incorporation of composite materials, notably fiber-reinforced polymers (FRPs), into the design of these freeform structures presents a strategic innovation. FRPs bring a new dimension to structural capabilities with their superior strength-to-weight ratios, durability, and design flexibility. Their application in freeform shells offers the potential to push beyond traditional limits, providing engineers and designers with the tools to realize structures that were once considered unfeasible. Consequently, an in-depth understanding of the behavior of composites under varied loading conditions is crucial.
Relevance of research topic. In constructing buildings with expansive halls covered by various shell structures, these coverings represent a considerable share of material use and labor. Consequently, advancements in the structural designs of these coverings are pivotal for progress across the construction industry. There is a critical need to develop innovative structural forms and leverage new materials that can reduce labor requirements on construction sites, cut costs, and expedite building timelines. Moreover, challenges in modeling and calculating thin-walled structures with complex shapes are prevalent not only in construction, but in various industrial sectors, such as aviation, aerospace, shipbuilding, and others. This research is driven by the urgent need to develop comprehensive methodologies to enhance the stiffness and stability of freeform shell
structures, particularly given their vulnerability to load changes, buckling, and environmental stresses. The emergence of fiber-reinforced polymers provides new opportunities for both architectural and structural design by combining superior mechanical properties with material versatility. Integrating FRPs into the design of freeform structures represents a strategic approach to overcoming the analytical and design challenges these structures present. While traditional form-finding methodologies lay the groundwork for defining the initial contours of freeform architectures, they often fall short in addressing the complexities of structural performance under diverse loading conditions. This gap highlights the need for innovative solutions that extend beyond mere form generation to include structural optimization and reinforcement as core elements of the design process. Addressing these challenges necessitates a comprehensive approach that transcends the limitations of traditional design methodologies, which typically focus only on the form-finding stage. This research aims to contribute significantly by offering a design methodology that integrates form finding with subsequent optimization and reinforcement under various loading conditions. By doing so, it strives to reconcile aesthetic aspirations with structural necessities, ensuring that the resulting structures are not only visually impressive but also meet the highest standards of structural performance.
Research development status. The design and realization of freeform structures, characterized by their complex geometries, represent a significant challenge within the construction industry. These structures, often embodying forms with double curvature or sculptural qualities unattainable through traditional methods, necessitate a fusion of highlevel structural analysis, design ingenuity, and advanced construction techniques. Despite the potential for architecturally expressive and spatially efficient large-span roofing structures, the reliance on conventional materials such as reinforced concrete or steel has historically limited the architectural and structural ambitions of such designs. Fiber-reinforced polymers opened new possibilities in this realm, offering superior mechanical and insulating properties that can significantly expand the application and functionality of shells and other freeform structures. The distinctive challenges of designing shell structures, which demand intricate analysis and a nuanced understanding of material
behavior under complex loading conditions, underscore the need for innovative approaches that go beyond mere form generation to encompass structural optimization and reinforcement. Traditionally, the design of freeform structures has been anchored in geometric, biomimetic, and form-finding methodologies. While effective in defining initial forms, these approaches often fall short in addressing the nuanced demands of structural performance, particularly under varied and dynamic loading conditions. The gap between initial form-finding and subsequent structural optimization and reinforcement is notable, highlighting an area ripe for development.
Moreover, the integration of FRPs within these design frameworks remains underexplored, with current applications mostly limited to experimental projects and a few pioneering constructions. This nascent field of inquiry promises to harness the unique properties of FRPs — such as high elasticity and the ability to form complex, optimized shapes through form-finding methods — to revolutionize freeform architectural design. The distinction between force-active and force-passive structural systems, as applied to freeform structures, further illustrates the nuanced considerations necessary for designing these complex geometries. Force-active systems, which adapt their shape in response to external loads, and force-passive systems, which maintain their form under loading, require tailored approaches to design and optimization that can leverage the benefits of FRPs. In essence, the current status of research and application in the field of freeform structures is at a pivotal juncture, where the potential for innovation is immense, yet the path forward requires a comprehensive strategy that not only embraces advanced materials like FRPs but also integrates cutting-edge design methodologies. This strategy must address the full spectrum of design considerations, from initial form generation and structural analysis to optimization and reinforcement, to realize the full potential of freeform structures in contemporary architecture.
The primary aim of this research is to elevate the structural efficacy of freeform shell structures through the integration of fiber-reinforced polymers and advanced form-finding methodologies. This effort seeks to balance the aesthetic and functional requirements of contemporary architecture by delivering solutions that enhance the
durability, stability, and sustainability of these constructions under different factors. In order to achieve this goal, the following tasks have been defined:
- To establish a complex methodology that combines experimental and theoretical research on composite shells formed through advanced shape-finding techniques. This should accurately reflect their structural behavior under load and the impact of various factors on the strength, stability, and deformability.
- To develop a systematic design workflow, that integrates form-finding, optimization, and reinforcement strategies. This objective focuses on crafting a methodology that ensures that the freeform shells achieve optimal structural performance. The workflow should be designed to adaptively respond to varying structural and environmental conditions.
- To investigate the potential of fiber-reinforced polymers in enhancing the structural design of freeform shells. This includes exploring innovative applications of FRPs to exploit their superior mechanical properties, such as high strength-to-weight ratios and corrosion resistance, which are critical for improving the durability of structures.
- To perform detailed structural analyses and empirical testing to validate the effectiveness of the proposed design methodologies. This objective involves rigorous testing of prototypes and scaled models under varied loading scenarios to empirically confirm their structural integrity, safety, and performance capabilities.
- To optimize the design of freeform shells to maximize their structural efficiency, performance and sustainability. This includes developing intelligent reinforcement strategies and using optimization algorithms to reduce material use and waste, thereby promoting sustainability in architectural design.
The scientific novelty of the work is the following:
First, this research critically examines freeform structures from the perspectives of form generation and conceptual design, and discusses the influential role of FRP composites in the design process. This analysis extends to both a scientific literature review and a historical overview of constructed projects, underscoring the transformative potential of FRPs in construction innovation.
Second, the study introduces a novel classification system for freeform composite structures, anchored in the methodologies employed in the conceptual design stage. This classification, which includes geometric, biomimetic, and form-finding approaches, provides a structured framework for understanding and navigating the diverse strategies underlying freeform design. It also highlights the unique challenges and potentials of each approach.
Next, this study addresses the research gap in the use of FRP materials with form-finding for shell structures. While there is some research done in the field of form-finding of structures with composite materials, this area remains narrowly explored. This work significantly contributes to filling this research gap, focusing on the integration of form-finding processes with FRP materials to create efficient freeform shell structures.
Further, a novel comprehensive design algorithm is presented that encapsulates the full spectrum of the design process from initial form finding to structural optimization and reinforcement. This algorithmic approach represents a methodological advance in creating designs that balance aesthetic appeal with structural integrity, emphasizing intelligent reinforcement strategies to maximize stiffness and stability.
Finally, a significant part of this work involves the development and implementation of reinforcement strategies that employ complex rib patterns for improving buckling resistance and overall stability of freeform shell structures. By applying geometric, biomimetic and topological optimization approaches, this research has developed solutions that not only address structural weaknesses, but also contribute to the sustainability and material efficiency of architectural designs.
Together, these contributions signal a shift toward a more integrated and innovative approach to the design and construction of freeform structures. By using the synergies between advanced materials such as FRPs, advanced form-finding techniques, and strategic reinforcement methods, this research paves the way for a new era of sustainable and efficient designs.
From a theoretical perspective, the value of this work investigates the analysis of freeform structures, examining them through the dual lenses of form generation and
conceptual design. It explores the revolutionary impact of fiber-reinforced polymer composites on design processes, weaving together historical insights and contemporary challenges to expand the academic discourse on material innovation. Moreover, by introducing a novel classification system based on the methodologies employed at the conceptual design stage, the study provides a structured framework that sheds light on various design strategies. This framework not only facilitates a deeper understanding of these strategies but also highlights the distinct challenges and opportunities presented by geometric, biomimetic, and form-finding approaches. Furthermore, the research addresses a notable gap in the integration of FRP materials with form-finding processes for shell structures, thereby contributing to a richer theoretical understanding of how materials can influence and elevate the architectural form and function.
The practical value of the dissertation is the development of a comprehensive design algorithm that spans from initial form-finding through to structural optimization and reinforcement. This algorithm equips architects and engineers with practical tools for creating structures that are both aesthetically pleasing and structurally sound. By emphasizing intelligent strategies to enhance stiffness and stability, the algorithm addresses the complex challenges associated with designing intricate geometries. Additionally, the study's focus on developing and implementing innovative reinforcement strategies using complex rib patterns provides practical solutions for improving the buckling resistance and overall stability of freeform shell structures. The effectiveness of these strategies, derived from geometric, biomimetic, and topology optimization approaches, underscores their potential to significantly improve structural performance. This practical contribution is of particular value to professionals seeking sustainable and material-efficient design options. Finally, the research plays a crucial role in bridging the gap between the conceptual design and the construction stages. The dissertation narrows the divide between creative aspirations of initial design and technical requirements of structural feasibility. It presents a validated framework for realizing freeform shell structures, supported by empirical evidence of enhanced performance and sustainability.
This dissertation work used the following research methods:
• Literature Review: A thorough examination of relevant literature, focusing on advancements in freeform shell structure design, optimization techniques, and smart design strategies. This review establishes the research foundation and identifies gaps in existing knowledge.
• Form-Finding Methods: Application of specific form-finding methods to establish the initial shapes of shell structures, emphasizing the use of:
- Force Density Method (FDM): Utilized for generating equilibrium shapes based on predefined force densities.
- Topological Mapping (TM): Used for generating initial geometric configurations, allowing for the flexible adaptation of structure topology to meet design and performance criteria.
• Optimization Methods: Application of sophisticated optimization algorithms to refine structural designs for enhanced performance, involving:
- Topology Optimization: Performed using the Abaqus/CAE Optimization module with a general (sensitivity-based) algorithm, focusing on optimizing material distribution within the structure for improved structural efficiency.
- Parametric Optimization: Executed within the Grasshopper environment, enabling the dynamic adjustment of design parameters to achieve optimal structural performance based on specific criteria.
• Verification: Verification of the optimized designs through:
- Numerical Simulations: Employing computational models to verify the designs against established performance criteria and ensure they meet structural efficiency requirements. Analysis of the structural integrity, stiffness, and stability of the designed shapes under various loading conditions, using finite element analysis (FEA) in Abaqus software suite.
- Physical Prototyping and Testing: Fabrication of scale models or prototypes for empirical testing, validating the computational models and optimization outcomes through real-world experiments.
In this dissertation, the author defends the following statements:
1. Development of an integrated design methodology: this dissertation introduces a comprehensive workflow that seamlessly integrates form-finding, optimization, and reinforcement strategies to tailor freeform shell structures for high structural performance. The approach is demonstrated through a case study where finite element analysis validates the structural integrity and response under applied loads. The workflow encompasses initial geometric configurations using topological mapping and force density methods to optimize the structural form, ensuring that both aesthetic qualities and functional demands are met efficiently. Notably, the iterative design process reflects in how modifications in the form-finding phase influence subsequent optimization steps, enhancing the overall stability and load-bearing capacity of the structures.
2. Innovative use of fiber-reinforced polymers in form-found shells: the dissertation provides novel insights into using fiber-reinforced polymers to overcome traditional material constraints in freeform architecture. The empirical data includes mechanical properties derived from extensive testing, which underpin the simulation models used to predict structural behavior accurately. The use of FRPs enabled the creation of designs that were previously unachievable, offering enhanced durability and resilience while maintaining lightweight properties.
3. Advancements in structural optimization techniques: advancements were made by introducing sophisticated optimization techniques combining topology and parametric optimization within the design process. the effectiveness of these techniques was illustrated through finite element models that displayed improved distribution of material and stress, leading to structures that maximize structural integrity while minimizing material use. Case studies detailed in the dissertation show how these optimized structures perform under simulated physical conditions, confirming their efficiency and the effectiveness of the optimization algorithms.
4. Smart reinforcement strategies: this dissertation advances the development of smart reinforcement strategies that utilize complex rib patterns, engineered to
significantly improve buckling resistance and structural stability in freeform shell structures. Through detailed finite element analysis, the research demonstrated how these reinforcements strategically improve load-bearing capacities without compromising the design's integrity. Case studies included in the dissertation illustrate how different reinforcement configurations affect structural performance, providing a deep understanding of the interactions between material properties, geometric configurations, and reinforcement strategies.
The author's personal contribution consists in setting the objectives, planning the experimental activities, systematization and analysis of literature data. The author conducted an extensive literature review and classification of composite freeform structures. The author conducted manufacturing of shell prototypes, mechanical testing of shells and finite element analysis, processing and interpretation of the obtained scientific results. The author participated in the preparation and presentation of oral and poster presentations at scientific conferences, writing articles for international peer-reviewed scientific journals.
Reliability and validation of the research results. The robust methodological framework of this dissertation, combined with empirical testing and validation through peer-reviewed publications, ensures the reliability and applicability of its findings. The research has been evaluated through the publication of four scientific papers in highranking international journals [228 - 231], indexed in Scopus and Web of Science. The scientific results were presented at four international conferences:
- 25th International Conference on Composite Structures. 19-21 July 2022. Faculty of Engineering, University of Porto, Portugal.
- The 13th International Conference on Key Engineering Materials. 24 - 26 March 2023. Istanbul University, Istanbul, Turkey.
- The 14th International Conference on Key Engineering Materials. 6 - 8 March 2024, Dubai, UAE.
- The 4th International Workshop of Advanced Manufacturing Technologies. 15-16 April 2024, Skolkovo Institute of Science and Technology, Moscow, Russia.
The research contributions have been critically reviewed by experts. Additionally, the integration of empirical testing with advanced simulation techniques, provides a solid foundation for the practical implementation of the proposed solutions.
Volume and structure of the dissertation. The dissertation consists of an abstract, six chapters, list of symbols and abbreviations, list of 231 references, and two appendices comprising of 7 figures. The dissertation is illustrated by 55 figures and 9 tables. The full volume of the dissertation is 174 pages.
The first chapter substantiates the relevance and significance of the dissertation topic. New provisions introduced by the author into the development of the problem of form-finding of complex geometry composite structures are outlined, the main results of the work that are submitted for defense are listed, their scientific significance and practical value are noted. Information on the implementation of research results is provided.
The second chapter provides the results of theoretical studies of the state of the art in the freeform composite structures, describes the methods which are used in the design of freeform structures, and provides the classification of these methods according to the methodology used at the first conceptual design stage. We define three general approaches: geometric approach, biomimetic approach, form-finding (equilibrium) approach. In geometric approach, the shapes of the structures are created as mathematically described surfaces, independently from the flow of forces acting in them. Biomimetic approach implies the analysis and understanding of natural processes and phenomena, and the creative implementation of natural principles to solve the challenges in other areas of science and technology. Form-finding approach is a design process when the defined shape of the structure follows the forces acting in it. In other worlds, it is a finding the shape in equilibrium under design loads. Also, this chapter analyses world experience in the design, structural analysis and construction of freeform composite structures, designed by each of these methodologies. Moreover, numerical form-finding methods used in the dissertation, are also discussed in the second chapter.
The third chapter details the adaptation of form-finding methods, particularly the force density method and topological mapping, for design of composite shell structures. This approach, though previously unused for composite shells, was adapted to generate the equilibrium shape. The model used for the experimental study is a square-plan, double-curvature shell supported at four points, made from carbon fiber-reinforced polymer. The initial design involved setting up support points, followed by defining the network topology and finding the equilibrium shape, which was then refined using Rhinoceros software to generate a non-uniform rational B-spline (NURBS) surface for manufacturing. The prototype shells were fabricated using vacuum infusion with two layers of biaxial carbon fabric. In total six shell prototypes were tested. The tests were conducted using two types of boundary conditions: unconstrained and constrained supports. A special test assembly was developed, with samples loaded centrally under displacement control. Digital image correlation was used to analyze the strain distribution on the surface of the shells during the tests. Finally, finite element simulations were conducted using ABAQUS software, replicating the mechanical tests to compare experimental data with numerical results. The simulations considered geometric nonlinearity and used the material properties derived from mechanical tests of elementary samples. Load-displacement curves demonstrated close agreement between the physical tests and the simulations, confirming the reliability of the adapted form-finding method for designing freeform composite shells. Strain analysis also showed a high degree of correlation between experimental and simulated results.
Chapter 4 presents an algorithm that integrates form-finding, structural analysis, and optimization to improve the stiffness and stability of freeform shell structures. The workflow involves several steps: defining the design boundaries, conducting form-finding, performing structural analysis, and applying optimization to improve performance, particularly under various load conditions. A case study demonstrates how a composite shell structure is optimized by incorporating a rib pattern. The design starts with the initial shell structure described in the previous chapter. To increase stiffness, a topology optimization was carried out using Abaqus, which generated an optimized
material distribution. The results were translated into rib patterns via parametric optimization in Grasshopper. The ribs were integrated into the finite element model for further analysis. The results showed significant improvements in structural performance. Even with the addition of ribs constituting just 10% of the original shell volume, the maximum buckling load increased from 600N to 1100N, and with 25% rib volume, it reached 2394N. The shell's rigidity also improved, with reduced displacement under loading when ribs were introduced. The reinforced designs underwent finite element analysis under the same conditions as the original, non-optimized shell, demonstrating the substantial benefits of rib reinforcement.
Chapter 5 explores methods to improve the structural integrity of form-found shells using rib-based reinforcements. It compares five different rib configurations: a regular rectangular grid pattern, a biomimetic Voronoi pattern, two patterns derived from topology optimization, and a historically inspired design based on the rib vaults of the Cathedral of Granada. The goal was to improve the stiffness and strength of the shell described in Chapter 3, while maintaining the constraint of using no more than 50% of the original shell's, ensuring a fair comparison between all designs. Rib thickness and material volume were standardized to ensure comparability. The regular stiffening pattern was designed using a 6x6 rectangular rib grid, inspired by coffered ceilings. The biomimetic Voronoi pattern was generated by placing 32 points on the shell surface to initiate a natural rib layout, achieving a material volume close to the other designs. The historically inspired rib pattern mirrored the rib pattern on one of the vaults in the Cathedral of Granada, with adjustments made to rib dimensions to fit the volume constraints. Two additional patterns were created using the Abaqus topology optimization module. In the first case, the shell itself is the design space for optimization, and in the second case, two shells were interconnected using tie constraint, while only the lower shell was the optimization design space. Prototypes for these designs were manufactured using carbon fiber reinforced polymers with vacuum infusion technology. CNC-milled rib patterns were bounded to the shells from below as a reinforcement with VK-9 glue under vacuum. These prototypes were tested under similar conditions to those described
in Chapter 3, using an Instron testing machine. Results showed that all rib patterns significantly improved the critical buckling load compared to the unreinforced shell, with the topology optimized patterns providing the highest increase. The most effective design achieved a maximum load of 2853 N, over 4.5 times greater than the unreinforced shell's capacity. Finite element simulations were performed to validate these results. The simulations confirmed the experimental findings, showing close alignment between the physical and numerical tests. The simulations also demonstrated the advantage of strategic rib reinforcement over simply increasing shell thickness: a thicker, unreinforced shell of equivalent mass was also analyzed and performed much worse than the rib-reinforced designs. The study also considered the performance of these patterns under asymmetrical loading. All rib-reinforced shells showed a reduction in performance under these conditions, but the value of reduction varied significantly. Finally, a new rib design was created by combining the optimized rib layout (designed by second optimization case) with a Voronoi pattern (which showed the least reduction in performance), inspired by the hierarchical structure of dragonfly wings. This biomimetic approach resulted in a pattern that performed well under both central and asymmetrical loading, highlighting the potential of integrating natural design principles into structural optimization.
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6 Conclusion
This dissertation has addressed key challenges in the design and optimization of freeform composite shell structures by focusing on four main areas: the development of an integrated design methodology, the innovative use of fiber-reinforced polymers in form-found shells, advancements in structural optimization techniques, and the development of smart reinforcement strategies. The research critically examined freeform structures from the perspectives of form generation and design, highlighting the transformative role of FRP composites in the design process. This analysis encompassed a comprehensive literature review and a historical overview of constructed projects, underscoring the innovative potential of FRPs in this field and the scientific gap of applications of FRPs in structures designed with form-finding. Also, the study introduces a novel classification system for freeform composite structures, anchored in the methodologies employed at the conceptual design stage. This system categorizes designs into geometric, biomimetic, and form-finding approaches, providing a structured framework for understanding and navigating diverse design strategies while highlighting the unique challenges and opportunities each approach presents.
Below is a summary of the main contributions of the dissertation:
1. Development of an integrated design methodology. An integrated design workflow was developed that seamlessly combines form-finding, structural analysis, optimization, and verification processes. This methodology allows for the efficient design of freeform shell structures that meet both aesthetic and structural requirements. The approach was demonstrated through the design and analysis of a composite shell structure, where form-finding techniques were integrated with finite element analysis and structural optimization to achieve the most effective structural form. The validity of this methodology was confirmed with a case study through both numerical simulations and physical experiments.
2. Innovative use of fiber-reinforced polymers in form-found shells. The research explored the potential of fiber-reinforced polymers in improving the structural design of
form-found shells. By integrating FRPs and form-finding design process, the study demonstrated significant improvements in stiffness and structural performance compared to traditional forms. The use of FRPs enabled the creation of lightweight structures with better durability and resilience. Experimental results confirmed that such shells exhibit superior performance, validating the innovative application of composite materials in freeform shell structures. Comparative analysis showed that the form-found shell exhibited higher stiffness compared to other traditional shapes such as spherical and cylindrical vaults.
3. Advancements in structural optimization techniques. Significant progress was made in integrating topology and parametric optimization into the design process. Topology optimization was performed using ABAQUS software, and a parametric algorithm was developed for post-processing of raw optimization results to align with real-world manufacturing constraints and functional requirements. This approach facilitated the transition from theoretical models to practical, manufacturable solutions. The optimized rib patterns developed through this process significantly improved the structural performance of the shells, increasing the maximum buckling load by up to four times compared to unreinforced structures. These findings demonstrate the effectiveness of integrating advanced optimization techniques into the design process.
4. Smart reinforcement strategies. The dissertation advanced the development of smart reinforcement strategies utilizing complex rib patterns engineered to improve buckling resistance and structural stability. Five different rib patterns were designed based on geometric, biomimetic, and topology optimization approaches, each adhering to a 50% volume constraint relative to the original shell. Mechanical testing and FEA of the reinforced shells demonstrated significant increases in stiffness and buckling resistance. The most effective pattern, derived from topology optimization, achieved a maximum load before buckling of 2853 N, over 4.5 times that of the unreinforced shell. Through finite element analysis and physical testing, it was shown that these reinforcements significantly improve buckling resistance and load-bearing capacity without compromising design integrity. The case studies demonstrated how different rib
configurations impact structural performance, providing valuable insights into how reinforcements can be strategically applied to improve the stability of freeform shells.
Looking forward, several promising directions for further development of this dissertation have been identified, and work has already begun on them:
1. One significant area is the integration of rib patterns at the form-finding stage, thereby affecting the overall shape of the shell. By incorporating reinforcement strategies early in the design process, the form of the structure can be inherently optimized for both load distribution and material efficiency.
2. Further perspective studies are investigating the scalability of the design algorithms and reinforcement strategies developed in this dissertation, focusing on the transition from small-scale prototypes to full-scale constructions and addressing the challenges of manufacturing and assembly in diverse architectural applications. Addressing issues such as material behavior at larger scales, connection design, and practical construction methods for complex geometries are crucial for real-world implementation.
3. Furthermore, an important direction for future research is the deeper exploration of hierarchical structures observed in nature to improve the biomimetic approach to rib pattern design. While this dissertation has begun to apply biomimetic concepts — such as the variable thickness and cross-sectional geometry of fibers in dragonfly wings — there remains significant potential for advancement. By conducting more in-depth studies, including precise measurements of thicknesses, cross-sections, and the hierarchical organization of load-resisting biological structures, we can further develop and refine our biomimetic strategies. This deeper understanding would enable the creation of reinforcement patterns that offer improved performance under a wider range of loading conditions. Advancing this biomimetic approach could lead to shells with better mechanical properties, adaptability, and resilience, pushing the boundaries of current structural design methodologies.
Список литературы диссертационного исследования кандидат наук Москалева Анастасия Викторовна, 2024 год
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