Composite Structures最新文献

{"title":"A novel explicit porous structure design method","authors":"Lixue Fang ,&nbsp;Mingxiao Shi ,&nbsp;Kang An ,&nbsp;Huichao Jiao ,&nbsp;Yongtai Han ,&nbsp;Xuan Wang ,&nbsp;Chunxiu Wang","doi":"10.1016/j.compstruct.2025.119232","DOIUrl":"10.1016/j.compstruct.2025.119232","url":null,"abstract":"<div><div>Porous Structures(PS) distinguished by their exceptional lightweight, elevated strength, and superior thermal insulation properties, which motivate researchers to find advanced PS based on traditional topology optimization(TO). However, large number of design variables, additional manufacturing constraints, and the lack of geometric information are challenging issues in PS design. To address this, a novel explicit porous structure design method is proposed in this paper. Not only utilizing traditional circular and B-spline(BS) boundary parametric equation, but also proposing adaptive polygonal parametric equation to characterize pore boundary explicitly. As a result, the pore geometry is directly controlled via fewer design variables, and the optimization mathematical model is established without any extra manufacturing or connectivity constraint. The sensitivity of the design variable is derived based on Boundary Evolution Theory(BET). The numerical examples are optimized and simulated to substantiate the effectiveness and capacity of the proposed method.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119232"},"PeriodicalIF":6.3,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917974","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}

{"title":"Braiding-process-induced damage and deformation of three-dimensional braided preform: A numerical investigation","authors":"Mengyuan Zhang ,&nbsp;Xingzhong Gao ,&nbsp;Shixuan Gao ,&nbsp;Hong Chen ,&nbsp;Jindan Wu ,&nbsp;Liwei Wu","doi":"10.1016/j.compstruct.2025.119223","DOIUrl":"10.1016/j.compstruct.2025.119223","url":null,"abstract":"<div><div>Three-dimensional braided composites (3DBC) are widely used in aerospace due to their excellent impact resistance and structural integrity. The excellent mechanical performance of 3DBC can be achieved by ensuring precise dimensions, stable structure and low-damage fabrication technology for the 3D braided preform. In this research work, we developed <em>meso</em>-scale and micro-scale finite element models to numerically analyze the damage and deformation behavior of braided structures during the fabrication process of 3D braided preform. The deformation and damage mechanism of fibers at different scales during 3D braiding process are first analyzed. The results show that stress always concentrates at the interlaced regions and is affected by the beating-up process. The outer yarns are more easily damaged during the braiding process. In the beating-up process, when the beater reaches the highest point, the first broken fiber is generated, and the broken fiber is located in the interlaced area. The damage caused by the beating-up motion is greater than that caused by fiber movement. The damage to the elements is mainly caused by shear stress. The greater the friction coefficient between fibers and the higher of the beating-up height, the more severe fiber deformation in the interlaced area. These results can provide valuable guidance for the fabrication of high-quality 3D braided preforms.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119223"},"PeriodicalIF":6.3,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908137","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}

{"title":"Experimental and numerical investigation on mechanical properties and failure modes of SiC/SiC tapered laminates: Effects of ply drop location","authors":"Chenyang Liu ,&nbsp;Sheng Zhang ,&nbsp;Xu Zhang ,&nbsp;Chengqian Dong ,&nbsp;Fang Wang ,&nbsp;Xiguang Gao ,&nbsp;Yingdong Song","doi":"10.1016/j.compstruct.2025.119241","DOIUrl":"10.1016/j.compstruct.2025.119241","url":null,"abstract":"<div><div>Aerospace laminated composite structures often require thickness variations along one or more directions in order to satisfy weight and aerodynamic efficiency requirements. Thickness variation is achieved by introducing dropped plies at appropriate locations. However, the influence mechanism of the ply drop location has not been adequately elucidated. In this work, the effect of ply drop location on the mechanical properties of tapered laminates has been investigated by experiment and simulation. Three different ply-drop configurations of tapered laminates were subjected to quasi-static tensile tests. The main failure modes are delamination and ply damage. Delamination can significantly reduce the load-bearing capacity of the structure. The simulation results are in good agreement with the test results in terms of failure load, load–displacement response, and delamination regions. The results demonstrate that the ply drop location affects the order of occurrence of the main failure modes of tapered laminates and the propagation path of ply damage cracks, thereby influencing their mechanical properties.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119241"},"PeriodicalIF":6.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913226","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}

{"title":"Enhancing compressive mechanical properties of anisotropic shell-based architected materials","authors":"Xinghao Wang ,&nbsp;Ziming Yan ,&nbsp;Shu Guo ,&nbsp;Yizhi Zhang ,&nbsp;Chenxu Liu ,&nbsp;Zhanli Liu","doi":"10.1016/j.compstruct.2025.119240","DOIUrl":"10.1016/j.compstruct.2025.119240","url":null,"abstract":"<div><div>Anisotropic architected materials offer significant advantages in expanding the design space of mechanical properties. However, anisotropic design for tailored compressive mechanical properties has remained limited due to the lack of comprehensive studies on large compressive deformation of anisotropic architected materials. In this paper, we designed and fabricated shell-based spinodoid architectures with highly tunable anisotropic mechanical properties and explored the mechanisms by which anisotropy affects the scaling laws for compressive mechanical properties. The results show that anisotropy can regulate the material arrangement within the architectures respect to load direction, enabling a wide range of scaling law exponents from 1.03 to 1.77. Further deformation analysis reveals that architectures with high anisotropy undergo global buckling, while direction-independent architectures exhibit localized deformation during compression. Architectures with specific anisotropic properties exhibit a broad design space at a fixed relative density and demonstrate superior effective modulus across a wide range of relative densities compared to traditional direction-independent lattice and shell-based architectures. Finally, by quantifying the geometrical anisotropy using the Mean Intercept Length (MIL) method, a generalized scaling law is derived to predict the compressive mechanical properties of anisotropic architected materials. This work offers innovative solutions for expanding the design space and enabling direction-dependent applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119240"},"PeriodicalIF":6.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903579","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}

{"title":"Creep behaviour and lifespan of flax fibre composites with different polymer matrices","authors":"Jianqun Hao ,&nbsp;Stepan V. Lomov ,&nbsp;Carlos A. Fuentes ,&nbsp;Aart Willem Van Vuure","doi":"10.1016/j.compstruct.2025.119246","DOIUrl":"10.1016/j.compstruct.2025.119246","url":null,"abstract":"<div><div>Despite the promising structural applications of thermoplastic polymer composites (TPCs) reinforced with natural fibres, their long-term performance remains insufficiently understood, which often results in the overdesign of composite structures. This work aims to gain a deeper understanding of the long-term creep behaviour of flax fibre-reinforced TPCs for load-bearing applications, focusing on selecting an optimal thermoplastic polymer among four different thermoplastic polymers − polypropylene, polyoxymethylene, polyamide 11, and polylactic acid, using epoxy as a benchmark. Short-term creep tests on the neat polymers and the composites reveal that the fibre/matrix interface plays a more important role in the creep response of the composites than the matrix itself, despite the polymer’s viscoelastic nature being the primary source of creep. “Run to failure” tests were performed using a custom-designed flexural creep set-up. The creep lifespan was analysed using an energy-based creep rupture model. Acoustic emission and scanning electron microscope were used to analyse creep damage evolution and rupture mechanisms, respectively. The longest lifespan among the four TPCs was observed in flax/polylactic acid composite, attributed to its superior interface properties, enhanced creep resistance, higher stored energy limit, and slower damage development. When compared with flax/epoxy composite under a same stress of 150 MPa, the four TPCs demonstrated a significantly shorter lifespan (one to three orders of magnitude shorter). Under a same stress ratio of 80 %, however, the four TPCs exhibited less disparate creep lifespan compared to flax/epoxy composite, suggesting their potential applications for low to medium load-bearing structural components.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119246"},"PeriodicalIF":6.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917976","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}

{"title":"The influence of void and fractured fiber defects on the ultrafine Z-pin and Mode I fracture toughness of CFRP laminates","authors":"Yihan Fu ,&nbsp;Weidong Zhu ,&nbsp;Shuran Li ,&nbsp;Mengze Li ,&nbsp;Jing Xiao ,&nbsp;Ling Yan ,&nbsp;Liang Cheng ,&nbsp;Yinglin Ke","doi":"10.1016/j.compstruct.2025.119243","DOIUrl":"10.1016/j.compstruct.2025.119243","url":null,"abstract":"<div><div>To minimize the damage caused by Z-pin insertion to the in-plane properties of the laminate, researchers have initiated investigations into the utilization of fine Z-pins and reduced insertion densities. However, the manufacturing process of fine Z-pins introduces voids and fiber fracture defects, leading to a decline in Z-pin quality and consequently affecting the efficacy of interlaminar toughening. In this research, defects in the Z-pin preparation process were identified through extensive experiments, and pre-stressing is applied during the curing of the Z-pin, leading to the successful development of the high-quality 80 μm and 90 μm diameter Z-pins. Furthermore, this research extensively examines the impact of these two defects on the quality of Z-pins and provides a model to determine the optimal Z-pin size corresponding to various insertion depths under the existing processing conditions. For example, according to the model, the optimal Z-pin size for laminates with a thickness of 4 mm is 90 μm. This ensures that the Z-pin’s failure mode remains at the critical transition between pull-out and fracture, thereby maximizing its tensile strength utilization. The research findings are validated through experimental verification, thus providing insights for the application of ultrafine Z-pins.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119243"},"PeriodicalIF":6.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902277","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}

{"title":"An impact localization method for composite structures based on time series features and machine learning","authors":"Minghua Wang ,&nbsp;Yuxuan Yan ,&nbsp;Weixuan Zhang ,&nbsp;Yi Zhang ,&nbsp;Di Wu ,&nbsp;Yue Wang ,&nbsp;Xinlin Qing ,&nbsp;Yishou Wang","doi":"10.1016/j.compstruct.2025.119242","DOIUrl":"10.1016/j.compstruct.2025.119242","url":null,"abstract":"<div><div>Aircraft composite structures are susceptible to visually undetectable internal damage from low-velocity impacts. However, their anisotropy and complex geometry lead to intricate impact signals, making localization highly challenging. In this paper, a two-step impact localization method based on time series features (TSF) and machine learning is proposed. The first stage of this methodology transforms impact response sequences from different zones into a spectrum of TSF sets, including recursive quantized features (RQF), recursive plot features (RPF) and gridded representation features (GPF). This is achieved using a time series image-based representation approach. Subsequently, three distinct convolutional neural networks (CNNs) are constructed, namely RQF-1DCNN, RPF-2DCNN and GPF-2DCNN. These networks are employed to mine and learn deep-level features of time-series data, thereby transforming the impact localization task into a time-series feature classification task, specifically impact zone identification. The second step aims to precisely identify the impact location within the zone by utilizing impact response data and geometric center-of-mass algorithms at known locations within the identified impact zone. The proposed method is validated through low-velocity impact tests on composite honeycomb panels and aircraft wing structures. Additionally, differences in impact localization accuracy among various network models are analyzed. This method offers a cost-effective solution, achieving high accuracy with fewer sensors and less training data. Test results demonstrate that the RPF-2DCNN and GPF-2DCNN models, which are based on image features, outperform the RQF-1DCNN for impact monitoring in composite structures, achieving reliable impact localization with data from a single sensor. Moreover, compared to GPF, RPF, with its deeper time response sequence, is more appropriate for impact monitoring on wing structures with complex structural characteristics.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119242"},"PeriodicalIF":6.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908136","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}

{"title":"A simplified fatigue characterization of defective CFRP laminates with infrared thermography","authors":"José Vicente Calvo,&nbsp;Norberto Feito,&nbsp;Eugenio Giner","doi":"10.1016/j.compstruct.2025.119228","DOIUrl":"10.1016/j.compstruct.2025.119228","url":null,"abstract":"<div><div>Fiber misalignment and out-of-plane waviness are defects encountered in composite material laminates. These defects are particularly prone to occur when adapting the laminate to angular or complex geometries. Using these defective laminates in aerospace applications can undermine their structural integrity and impact their mechanical properties. This work involves a study of applying infrared thermography techniques to estimate the fatigue limit based on the energy dissipated during tensile testing. Defect-free CFRP laminates and laminates with several out-of-plane waviness distributed along the sample and through the thickness are tested at various stress levels. Estimation of their fatigue limit using thermography is performed, and the results show a significant agreement to those obtained through <em>S-N</em> curves, with less than 2% error for defect-free specimens and 13% for defective ones. A reduction in mechanical properties and service life is observed in the material with defects compared to defect-free material, with a decrease of 16% of the ultimate strength and 40% of the fatigue limit. The study supports the application of thermography as a simple and rapid technique to detect and locate this type of defect and characterize the fatigue limit of the CFRP laminate.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119228"},"PeriodicalIF":6.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921616","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}

{"title":"On the influence of material property uncertainties for a phenomenological progressive damage in composite laminated coupons: A sensitivity analysis approach","authors":"Pedro Bührer Santana ,&nbsp;Herbert Martins Gomes ,&nbsp;António J.M. Ferreira ,&nbsp;Volnei Tita","doi":"10.1016/j.compstruct.2025.119209","DOIUrl":"10.1016/j.compstruct.2025.119209","url":null,"abstract":"<div><div>The current demand for lightweight and high-strength materials in various engineering applications makes the understanding of the inherent uncertainties in composite behavior crucial. This paper introduces for the first time a comprehensive framework to study the effect on the structural performance of uncertainties related to potential variation in the mechanical properties of laminated fiber-reinforced composite materials. The new framework for stochastic modeling incorporates probabilistic approaches to quantify uncertainties in material properties and their influence on damage progression. One of the advantages of the proposed methodology is the comparison of numerical results with experimental ones on a series of bending tests. Our findings demonstrate that the integration of uncertainty quantification into the analysis of composite materials can lead to more robust engineering solutions, identifying the uncertainty in the damage parameters and material properties,explaining variability in the experimental data sets.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119209"},"PeriodicalIF":6.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898952","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}

{"title":"Electromechanical coupling Voronoi cell finite element method for simulating interface debonding in piezoelectric particulate composites","authors":"Zhiyi Wang,&nbsp;Rui Zhang,&nbsp;Ran Guo","doi":"10.1016/j.compstruct.2025.119226","DOIUrl":"10.1016/j.compstruct.2025.119226","url":null,"abstract":"<div><div>This<!--> <!-->study develops an electromechanical coupling Voronoi Cell Finite Element Method (VCFEM) for analyzing perfect bonding and debonding interfaces in piezoelectric particulate composites. Homogenization theory fails to accurately capture stress concentrations in composites with large-scale random particle distributions, while<!--> <!-->the traditional finite element method suffers from excessive computational demands due to mesh density requirements. The proposed<!--> <!-->VCFEM effectively addresses these issues. This study establishes electromechanical coupling Voronoi element models for inclusions. Meanwhile, based on the Voronoi cell finite element method, a modified functional is proposed that reflects the continuity conditions at the bonding interface and the generalized traction being zero at the debonding interface. In each element, stress and electric displacement fields are independently defined in matrix and inclusion subdomains, while displacement and electric potential fields are prescribed on external boundaries and matrix-inclusion interfaces. The VCFEM enables concurrent modeling of mechanical and electric field concentrations and progressive interface debonding within individual Voronoi cells. Several numerical examples are used to validate the accuracy and efficiency of the proposed method, and.</div><div>they further simulate the debonding evolution in piezoelectric composites under electromechanical loading.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119226"},"PeriodicalIF":6.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896115","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}