Composite Structures最新文献

英文中文

Stress-related multi-material structures topology optimization with gradient interfaces

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-17 DOI: 10.1016/j.compstruct.2025.119176

Xiaomei Huang, Yun Chen, Liang Hou, Congmin Miao, Yuan Li

Aerospace components, such as turbine disks, endure complex loads and extreme thermal conditions. Stress-related multi-material topology optimization (MMTO) allows for the superior performance design of these components. Additionally, most studies on MMTO focus on continuous or single-gradient interfaces, multi-gradient design remains largely unexplored. This study proposes a stress minimization topology optimization method for multi-material structures with gradient interfaces. A multi-gradient material interpolation is established based on the standard solid isotropic material with penalization (SIMP) method and piecewise Heaviside projection, and the quantity and properties of gradient materials are defined by the gradient ratios of parent materials. Notably, the proposed method requires only a single set of density variables. The global stress is evaluated using the p-norm function, and element sensitivity is calculated with the adjoint method. Design variables are filtered. Turbine disk and L-bracket examples are presented to validate the effectiveness of the proposed approach. The results demonstrate that multi-material structures with gradient interfaces can be effectively described and optimized. The quantity and mechanical properties of gradient materials can be precisely defined. The maximum stress in single-gradient and double-gradient structures is lower than that in non-gradient structures, indicating that topology design with gradient interfaces enhances structural strength. The proposed method effectively reduces the stress level by distributing multi-gradient materials across multi-material interfaces.

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引用次数: 0

Exact solutions for the linear hardening elastoplastic model in functionally graded spherical shell

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-17 DOI: 10.1016/j.compstruct.2025.119208

Jun Xie , Xiaofan Gou , Pengpeng Shi

As functionally graded materials (FGMs) technology advances, there has been a growing emphasis on the mechanical analysis of FGMs structures. Exceeding the yield strength in FGMs structures often leads to irreversible plastic deformation in localized regions under applied loads. An analysis of the linear hardening elastoplastic model is necessary to assess accurately the load-carrying capacity of these structures. It is assumed that the elastic modulus of FGMs spherical shell varies with the thickness distribution of the structure according to a power function. This paper provides the exact solutions for the linear hardening elastoplastic model in the FGMs spherical shell under mechanical loads, including purely elastic, partially plastic, and fully plastic deformation states. The elastoplastic theory is employed to analyze the linear hardening elastoplastic model, and each deformation state is thoroughly analyzed. A significant contribution of this research is the presentation of comprehensive exact solutions for the linear hardening elastoplastic model in FGMs spherical shell, addressing all deformation regions. The findings demonstrate that the radial variation in material properties significantly influences the elastoplastic model analysis of the FGMs spherical shell. These conclusions are expected to aid in the design of FGMs spherical shells to mitigate yielding under high circumferential stress.

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引用次数: 0

Energy absorber inspired by spider webs

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-15 DOI: 10.1016/j.compstruct.2025.119160

Koray Yavuz , Seymur Jahangirov , Recep M. Gorguluarslan

The spider orb web has evolved to efficiently absorb the energy of flying insects colliding with it. In this study, a novel three-dimensional lattice structure inspired by the specific structural characteristics of the spider orb web was designed and optimized to create a new lattice design. The design was optimized for energy absorption and energy absorption efficiency using a size optimization procedure with numerical modeling based on beam elements under quasi-static compression loading. This optimized lattice was additively manufactured and subjected to quasi-static compression testing. Numerical results for energy absorption and compression behavior showed good agreement with experimental findings. Additionally, numerical analysis of the optimized lattice was performed using solid elements to predict the energy absorption behavior more accurately, and the results showed even better agreement with experimental data. The resulting lattice also demonstrated improved energy absorption performance compared to existing lattice structures.

引用次数: 0

Ultra-high temperature mechanical behavior and microstructural evolution of needle-punched carbon/carbon composites under time-varying thermo-mechanical coupling conditions

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-15 DOI: 10.1016/j.compstruct.2025.119192

Boyi Wang, Songhe Meng, Bo Gao, Kunjie Wang, Chenghai Xu

Carbon/carbon (C/C) composites are extensively employed in the thermal protection systems of hypersonic vehicles, and the precise acquisition of critical process information is vital for the reliable design of such vehicles. Consequently, this research introduces a high-temperature repeated loading testing protocol for needle-punched C/C composites, aimed at characterizing the mechanical behavior of re-entry vehicles in intricate thermal–mechanical coupling environments. Initially, an ultra-high-temperature speckle pattern was prepared using plasma spraying and laser etching techniques, which is suitable for the temperature range of this study (room temperature to 2000 °C). Subsequently, under time-varying temperature and load conditions, the local strain field and tensile properties were investigated. In the single-loading test, at 1500 °C, the stress–strain curve slope decreased by up to 58 %. In the cyclic loading test, at 2000 °C, the slope increased by up to 46 % with the number of cycles, while the specimen strength decreased by up to 27.1 % compared to the standard test. By examining fracture morphology and internal structure at both macroscopic and microscopic scales, the study elucidated how interfacial performance and the level of graphitization contribute to the tensile behavior. The results indicate that as the number of loading cycles increases, the stress–strain curve slope is primarily influenced by interfacial properties and carbon fiber graphitization, with each playing a dominant role at different loading stages. Additionally, tensile strength decreases with the rise in loading cycles, positively correlating with interfacial performance and inversely with carbon fiber graphitization.

{"title":"Ultra-high temperature mechanical behavior and microstructural evolution of needle-punched carbon/carbon composites under time-varying thermo-mechanical coupling conditions","authors":"Boyi Wang, Songhe Meng, Bo Gao, Kunjie Wang, Chenghai Xu","doi":"10.1016/j.compstruct.2025.119192","DOIUrl":"10.1016/j.compstruct.2025.119192","url":null,"abstract":"<div><div>Carbon/carbon (C/C) composites are extensively employed in the thermal protection systems of hypersonic vehicles, and the precise acquisition of critical process information is vital for the reliable design of such vehicles. Consequently, this research introduces a high-temperature repeated loading testing protocol for needle-punched C/C composites, aimed at characterizing the mechanical behavior of re-entry vehicles in intricate thermal–mechanical coupling environments. Initially, an ultra-high-temperature speckle pattern was prepared using plasma spraying and laser etching techniques, which is suitable for the temperature range of this study (room temperature to 2000 °C). Subsequently, under time-varying temperature and load conditions, the local strain field and tensile properties were investigated. In the single-loading test, at 1500 °C, the stress–strain curve slope decreased by up to 58 %. In the cyclic loading test, at 2000 °C, the slope increased by up to 46 % with the number of cycles, while the specimen strength decreased by up to 27.1 % compared to the standard test. By examining fracture morphology and internal structure at both macroscopic and microscopic scales, the study elucidated how interfacial performance and the level of graphitization contribute to the tensile behavior. The results indicate that as the number of loading cycles increases, the stress–strain curve slope is primarily influenced by interfacial properties and carbon fiber graphitization, with each playing a dominant role at different loading stages. Additionally, tensile strength decreases with the rise in loading cycles, positively correlating with interfacial performance and inversely with carbon fiber graphitization.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"365 ","pages":"Article 119192"},"PeriodicalIF":6.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-body dynamic transfer matrix modeling and validation for full-scale wind turbine blades in biaxial fatigue testing systems

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-15 DOI: 10.1016/j.compstruct.2025.119205

Yi Ma, Aiguo Zhou, Yutian Zhu, Jinlei Shi, Shiwen Zhao, Jianzhong Wu

Continuous advancements in wind turbine technology, driven by the pursuit of increased power generation and extended blade dimensions, have heightened the demand for reliable biaxial fatigue testing of full-scale blades. Such testing is critical for evaluating long-term structural integrity under realistic loading conditions. This study presents a novel multi-body dynamic transfer matrix methodology to address the modeling and analysis challenges inherent in full-scale biaxial testing systems for large wind turbine blades. The proposed approach discretizes the heterogeneous blade structure into beam elements and employs transfer matrix theory to derive system matrices encompassing spatial beam dynamics, mass distribution, damping characteristics, and elastic properties. Through the systematic formulation of the dynamic transfer equations and subsequent numerical solutions of the characteristic equations, this method enables comprehensive vibration analysis of the multi-body test system. Comparative validation through finite element simulations and experimental measurements demonstrates that the equivalent model achieves prediction discrepancies below 7% across multiple blade configurations. The developed framework provides an effective multibody transfer matrix model for investigating vibration characteristics and bending moment distributions in blade fatigue testing systems, establishing theoretical foundations for dynamic characterization and optimized design of full-scale biaxial fatigue testing platforms.

{"title":"Multi-body dynamic transfer matrix modeling and validation for full-scale wind turbine blades in biaxial fatigue testing systems","authors":"Yi Ma, Aiguo Zhou, Yutian Zhu, Jinlei Shi, Shiwen Zhao, Jianzhong Wu","doi":"10.1016/j.compstruct.2025.119205","DOIUrl":"10.1016/j.compstruct.2025.119205","url":null,"abstract":"<div><div>Continuous advancements in wind turbine technology, driven by the pursuit of increased power generation and extended blade dimensions, have heightened the demand for reliable biaxial fatigue testing of full-scale blades. Such testing is critical for evaluating long-term structural integrity under realistic loading conditions. This study presents a novel multi-body dynamic transfer matrix methodology to address the modeling and analysis challenges inherent in full-scale biaxial testing systems for large wind turbine blades. The proposed approach discretizes the heterogeneous blade structure into beam elements and employs transfer matrix theory to derive system matrices encompassing spatial beam dynamics, mass distribution, damping characteristics, and elastic properties. Through the systematic formulation of the dynamic transfer equations and subsequent numerical solutions of the characteristic equations, this method enables comprehensive vibration analysis of the multi-body test system. Comparative validation through finite element simulations and experimental measurements demonstrates that the equivalent model achieves prediction discrepancies below 7% across multiple blade configurations. The developed framework provides an effective multibody transfer matrix model for investigating vibration characteristics and bending moment distributions in blade fatigue testing systems, establishing theoretical foundations for dynamic characterization and optimized design of full-scale biaxial fatigue testing platforms.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"365 ","pages":"Article 119205"},"PeriodicalIF":6.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fatigue response and fracture mechanisms of polymer matrix composites under dominance of the self-heating effect

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-14 DOI: 10.1016/j.compstruct.2025.119207

Andrzej Katunin , Tomasz Rogala , Jafar Amraei , Dominik Wachla , Marcin Bilewicz , Łukasz Krzemiński , Paulo N.B. Reis

The self-heating effect in polymer matrix composites (PMCs) can be dangerous due to dominance of the fatigue process and its significant acceleration. Therefore, investigation of its influence on structural behavior and thermomechanical response is crucial for safe and reliable operation of PMCs. Due to lack of standardization of criteria of determination of fatigue properties, such as fatigue limit, during various modes of fatigue loading, the investigation of fatigue response attracts special attention. In some loading scenarios when the process is dominated either by mechanical fatigue degradation or self-heating effect, the classical approaches to determine fatigue limit may fail. This implies the need to establish new criteria for fatigue limit determination, also considering stress relaxation. In this study, the authors demonstrated that fatigue behavior is represented by bi-linear S-N curve, which reveals different thermomechanical responses and damage mechanisms under specific loading conditions. Moreover, it was demonstrated the existence of a transition point on the intersection of these S-N curves, where dominance of self-heating effect and mechanical degradation was clearly noticeable. The fatigue process for both mentioned regimes was characterized in terms of self-heating temperature evolution and acoustic emission, which was validated by microscopic analysis and X-ray computed tomography after fatigue failure.

{"title":"Fatigue response and fracture mechanisms of polymer matrix composites under dominance of the self-heating effect","authors":"Andrzej Katunin , Tomasz Rogala , Jafar Amraei , Dominik Wachla , Marcin Bilewicz , Łukasz Krzemiński , Paulo N.B. Reis","doi":"10.1016/j.compstruct.2025.119207","DOIUrl":"10.1016/j.compstruct.2025.119207","url":null,"abstract":"<div><div>The self-heating effect in polymer matrix composites (PMCs) can be dangerous due to dominance of the fatigue process and its significant acceleration. Therefore, investigation of its influence on structural behavior and thermomechanical response is crucial for safe and reliable operation of PMCs. Due to lack of standardization of criteria of determination of fatigue properties, such as fatigue limit, during various modes of fatigue loading, the investigation of fatigue response attracts special attention. In some loading scenarios when the process is dominated either by mechanical fatigue degradation or self-heating effect, the classical approaches to determine fatigue limit may fail. This implies the need to establish new criteria for fatigue limit determination, also considering stress relaxation. In this study, the authors demonstrated that fatigue behavior is represented by bi-linear <em>S</em>-<em>N</em> curve, which reveals different thermomechanical responses and damage mechanisms under specific loading conditions. Moreover, it was demonstrated the existence of a transition point on the intersection of these <em>S</em>-<em>N</em> curves, where dominance of self-heating effect and mechanical degradation was clearly noticeable. The fatigue process for both mentioned regimes was characterized in terms of self-heating temperature evolution and acoustic emission, which was validated by microscopic analysis and X-ray computed tomography after fatigue failure.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"365 ","pages":"Article 119207"},"PeriodicalIF":6.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of grinding parameters on material failure mechanisms of 2D silicon carbide fiber-reinforced silicon carbide composites 磨削参数对二维碳化硅纤维增强碳化硅复合材料失效机理的影响

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-14 DOI: 10.1016/j.compstruct.2025.119175

Yao Liu , Zhaokun Zhang , Jiahao Li , Jinzhu Guo , Jinjie Zhou , Chunlei K. Song

The Silicon Carbide Fiber-Reinforced Silicon Carbide (SiC_f/SiC) composite is widely used in ultra-high-temperature applications due to its exceptional properties, but its brittleness makes machining, especially grinding, challenging. This study investigates the failure modes of fibers and the matrix during grinding of 2D SiC_f/SiC composites under varying process parameters, such as wheel speed, feed rate, grinding depth, and surface structure. The results show that transverse fibers undergo ductile removal, shear fracture, bending fracture, and tensile fracture, while longitudinal fibers primarily experience ductile removal, tensile fracture, and bending fracture and normal fibers mainly exhibit shear and bending fractures. The matrix exhibits ductile, brittle, powdery, and peel-off removal modes. Grinding the woven surface (WS) leads to higher grinding forces and surface roughness than the stacking surface (SS), due to differences in fracture mechanisms. The primary material removal mechanisms of grinding wheel are friction wear and grit breakage, resulting from the high hardness of SiC_f/SiC. Increasing wheel speed reduces both grinding force and surface roughness by promoting ductile removal, which is attributed to decreased undeformed chip thickness and enhanced strain toughness. The optimal grinding conditions are high wheel speed and sharp grit on the SS, yielding the best surface quality.

{"title":"Effects of grinding parameters on material failure mechanisms of 2D silicon carbide fiber-reinforced silicon carbide composites","authors":"Yao Liu , Zhaokun Zhang , Jiahao Li , Jinzhu Guo , Jinjie Zhou , Chunlei K. Song","doi":"10.1016/j.compstruct.2025.119175","DOIUrl":"10.1016/j.compstruct.2025.119175","url":null,"abstract":"<div><div>The Silicon Carbide Fiber-Reinforced Silicon Carbide (SiC<sub>f</sub>/SiC) composite is widely used in ultra-high-temperature applications due to its exceptional properties, but its brittleness makes machining, especially grinding, challenging. This study investigates the failure modes of fibers and the matrix during grinding of 2D SiC<sub>f</sub>/SiC composites under varying process parameters, such as wheel speed, feed rate, grinding depth, and surface structure. The results show that transverse fibers undergo ductile removal, shear fracture, bending fracture, and tensile fracture, while longitudinal fibers primarily experience ductile removal, tensile fracture, and bending fracture and normal fibers mainly exhibit shear and bending fractures. The matrix exhibits ductile, brittle, powdery, and peel-off removal modes. Grinding the woven surface (WS) leads to higher grinding forces and surface roughness than the stacking surface (SS), due to differences in fracture mechanisms. The primary material removal mechanisms of grinding wheel are friction wear and grit breakage, resulting from the high hardness of SiC<sub>f</sub>/SiC. Increasing wheel speed reduces both grinding force and surface roughness by promoting ductile removal, which is attributed to decreased undeformed chip thickness and enhanced strain toughness. The optimal grinding conditions are high wheel speed and sharp grit on the SS, yielding the best surface quality.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"365 ","pages":"Article 119175"},"PeriodicalIF":6.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Topology optimization of hard-magnetic soft laminates for wide tunable SH wave bandgaps

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-12 DOI: 10.1016/j.compstruct.2025.119157

Zeeshan Alam, Atul Kumar Sharma

The periodic laminates made of hard-magnetic soft materials (HMSMs) have recently received increasing attention due to their tunable phononic bandgap characteristics—ranges of frequencies at which sound and vibrations cannot propagate, which can be controlled remotely through magnetically induced finite deformations. In this work, we present a gradient-based topology optimization framework for determining the optimum distribution of laminate phases to optimize the anti-plane shear wave (SH wave) bandgap characteristics. In particular, by employing the method of moving asymptotes (MMA), we maximize the bandgap width when the laminate is subjected to external magnetic fields. The Gent material model of hyperelasticity, in conjunction with the ideal HMSMs model, is used to describe the constitutive response of the laminate phases. To extract the band structure of the hard-magnetic soft laminate, we employ an in-house finite element model. To demonstrate the capability of the developed numerical framework, a parametric study exploring the effect of the applied external magnetic field on the optimized bandgap characteristics and the design of the periodic laminated composite unit cell is presented. The optimization framework presented in this study will be helpful in the design and development of futuristic tunable wave manipulators.

{"title":"Topology optimization of hard-magnetic soft laminates for wide tunable SH wave bandgaps","authors":"Zeeshan Alam, Atul Kumar Sharma","doi":"10.1016/j.compstruct.2025.119157","DOIUrl":"10.1016/j.compstruct.2025.119157","url":null,"abstract":"<div><div>The periodic laminates made of hard-magnetic soft materials (HMSMs) have recently received increasing attention due to their tunable phononic bandgap characteristics—ranges of frequencies at which sound and vibrations cannot propagate, which can be controlled remotely through magnetically induced finite deformations. In this work, we present a gradient-based topology optimization framework for determining the optimum distribution of laminate phases to optimize the anti-plane shear wave (SH wave) bandgap characteristics. In particular, by employing the method of moving asymptotes (MMA), we maximize the bandgap width when the laminate is subjected to external magnetic fields. The Gent material model of hyperelasticity, in conjunction with the ideal HMSMs model, is used to describe the constitutive response of the laminate phases. To extract the band structure of the hard-magnetic soft laminate, we employ an in-house finite element model. To demonstrate the capability of the developed numerical framework, a parametric study exploring the effect of the applied external magnetic field on the optimized bandgap characteristics and the design of the periodic laminated composite unit cell is presented. The optimization framework presented in this study will be helpful in the design and development of futuristic tunable wave manipulators.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119157"},"PeriodicalIF":6.3,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visco-elastoplastic constitutive modeling of coated woven fabrics — Impact of inelastic response on structural analysis

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-11 DOI: 10.1016/j.compstruct.2025.119164

L. Makhool, D. Balzani

A constitutive model for the highly nonlinear, anisotropic, and inelastic behavior of coated woven fabrics is proposed by suitably combining different model components from the literature. The material model accounts for viscoelasticity and plastic anisotropy at finite strains and thus, enables the geometrically nonlinear simulation of engineering constructions including prestretch processes and history-dependent load protocols. The formulation is adjusted to experimental data, specifically designed to isolate the individual aspects of the model, and it shows a decent agreement with the data. A numerical integration procedure is provided and the utilization of the model in a computational setting is addressed. Through an exemplary boundary value problem replicating a simplified roof construction, the impact of the individual features of the model on the structural response are analyzed and compared with the linear elastic model commonly used in engineering practice and a competitive hyperelastic model from the literature. As a result, the model shows significant differences to the simpler formulations and is thus found beneficial for the numerical analysis of structural problems.

{"title":"Visco-elastoplastic constitutive modeling of coated woven fabrics — Impact of inelastic response on structural analysis","authors":"L. Makhool, D. Balzani","doi":"10.1016/j.compstruct.2025.119164","DOIUrl":"10.1016/j.compstruct.2025.119164","url":null,"abstract":"<div><div>A constitutive model for the highly nonlinear, anisotropic, and inelastic behavior of coated woven fabrics is proposed by suitably combining different model components from the literature. The material model accounts for viscoelasticity and plastic anisotropy at finite strains and thus, enables the geometrically nonlinear simulation of engineering constructions including prestretch processes and history-dependent load protocols. The formulation is adjusted to experimental data, specifically designed to isolate the individual aspects of the model, and it shows a decent agreement with the data. A numerical integration procedure is provided and the utilization of the model in a computational setting is addressed. Through an exemplary boundary value problem replicating a simplified roof construction, the impact of the individual features of the model on the structural response are analyzed and compared with the linear elastic model commonly used in engineering practice and a competitive hyperelastic model from the literature. As a result, the model shows significant differences to the simpler formulations and is thus found beneficial for the numerical analysis of structural problems.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"365 ","pages":"Article 119164"},"PeriodicalIF":6.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the flexural creep stiffness of chopped basalt fiber reinforced asphalt using finite elements and mean field homogenization

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-04-11 DOI: 10.1016/j.compstruct.2025.119197

Xing Wu , Gabriele Milani , Aihong Kang , Pengfei Liu

The aim of the paper is to study the flexural creep stiffness of chopped basalt fiber reinforced asphalts (CBFRAs) using both the finite element (FE) and the mean field homogenization (MFH) method. First, a reliable three-dimensional FE model of a chopped basalt fiber reinforced asphalt is artificially generated with Matlab. Two FE models, in which wire and solid elements are used to mesh fibers, are numerically tested in bending and compared, validating them against experimental results. Then, two different mean field homogenization analytical models based on the Mori-Tanaka approach, which consider the random fiber orientations are developed and applied to predict the flexural creep stiffness of CBFRAs. Third, different fiber approximation methods are considered to carry out MFH computations. Fourthly, the MFH-amending-coefficient (MFHAC) method is proposed to amend MFH predictions, to improve convergence towards FE results. Finally, the MFH methods are compared with several traditional micro-mechanical models available. The results show that there is a significant difference between the results obtained using wire and solid elements, the solid FE model being more reliable. Particular attention should be paid to the values adopted for the fiber simplification number, to match correctly with experimental evidence. The flexural creep stiffness predicted by the two proposed MFH analytical models are closely aligned one each other. The fiber approximation methods adopted during the MFH analysis affect the results, with predictions more accurate when the actual fiber bundle is represented as an ellipsoidal inclusion based on the same-volume-radius criterion. The MFH-amending-coefficient method, combined with the results provided by MFH, can correctly predict the flexural creep stiffness of CBFRAs, allowing a reduction of the computational burden and an increase of computational efficiency when compared with standard FE simulations. It is finally shown how the MFH methods proposed are more accurate than existing methods available in literature.

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