Composite Structures最新文献

{"title":"An experimental study on the delamination fracture of a unidirectional thermoplastic composite under different in-plane loading modes using acoustic emission","authors":"Javane Karami ,&nbsp;Dimitrios G. Aggelis ,&nbsp;Ali Shivaie Kojouri ,&nbsp;Jérémy Chevalier ,&nbsp;Danny Van Hemelrijck ,&nbsp;Kalliopi-Artemi Kalteremidou","doi":"10.1016/j.compstruct.2025.119333","DOIUrl":"10.1016/j.compstruct.2025.119333","url":null,"abstract":"<div><div>In laminated composites, delamination is one of the most detrimental mechanisms capable of considerably compromising the load-bearing capacity of structures. One of the parameters that is crucial in evaluating the propagation of a delamination crack is the mode mixity, which defines the relative contribution of mode II strain energy release rate. Due to its structural applications, the in-plane delamination behaviour of PEKK-FC, commercially known as APC, is of high importance and thus considered in this study by using non-destructive techniques including Acoustic Emission (AE) and Digital Image Correlation (DIC). Besides the meticulous delamination fracture characterization of APC, the potential of AE in predicting the mode mixity in symmetrical and unidirectional specimens, for which theoretical solutions for calculating the decomposed strain energy release rate values are available, is assessed. A supervised classification model is trained using the AE activity of the delamination tests under mode I and mode II loading and then successfully evaluated by considering the data coming from different mode mixity values. At the end, the AE activity of mode I versus mode II is further scrutinized, and it is shown that for the case of APC, the attenuation of AE waves is more pronounced under mode I.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119333"},"PeriodicalIF":6.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213086","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":"Problem-Independent Machine Learning (PIML) enhanced 3D lattice composite structures optimization via moving morphable components approach","authors":"Wu Xu ,&nbsp;Chang Liu ,&nbsp;Yilin Guo ,&nbsp;Mengcheng Huang ,&nbsp;Xu Guo","doi":"10.1016/j.compstruct.2025.119330","DOIUrl":"10.1016/j.compstruct.2025.119330","url":null,"abstract":"<div><div>Lattice structures are increasingly adopted in various engineering fields due to their superior mechanical properties. This paper presents a novel methodology for designing and optimizing three-dimensional lattice structures based on the moving morphable components approach, integrating machine learning techniques to improve computational efficiency. The method models lattice structures with spatially varying material distributions, leveraging components with explicit geometric parameters. A gradient effect is achieved through partitioned coordinate mapping based on B-Spline basis function, enabling the adjustment of strut thickness, cellular shape, and local orientation while maintaining perfect connectivity. To address the computational challenges associated with large-scale finite element analysis, a problem-independent machine learning model is employed to capture the mechanical responses of complex structures. Numerical results validate that the proposed method can produce graded lattice structures with smooth topological transitions across adjacent microstructures under various boundary conditions, notably improving the load-bearing capacity compared to periodic lattices. Moreover, the problem-independent machine learning method significantly enhances computational efficiency in complex lattice composite structure design and provides promising insights for the future application of machine learning in large-scale structural optimization.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119330"},"PeriodicalIF":6.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213049","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":"Exploring the potential energy landscape of square bistable laminates bonded with piezoelectric macro fiber composites","authors":"Danish Bashir ,&nbsp;P.M. Anilkumar ,&nbsp;B.N. Rao","doi":"10.1016/j.compstruct.2025.119239","DOIUrl":"10.1016/j.compstruct.2025.119239","url":null,"abstract":"<div><div>The concept of the asymmetric nature of a bistable composite laminate involves tailoring the potential energy landscape to achieve tunable behavior, which is crucial for optimizing its performance in various morphing and energy harvesting applications. A conventional square cross-ply laminate exhibits perfectly symmetric behavior with equal potential minima. The addition of smart materials, like piezoelectric macro fiber composite (MFC) actuators for morphing and energy harvesting applications, induces an asymmetric nature in the overall potential energy landscape of the resulting bistable-MFC structure. This asymmetric energy landscape plays a significant role in the difference between snap-through and snap-back characteristics, suppression of cross-well vibrations, and the tailoring of energy harvesting capabilities. This paper aims to systematically investigate the asymmetric nature of an MFC-bonded active square bistable laminate, where MFCs are used for shape morphing and energy harvesting actions. A Rayleigh–Ritz-based semi-analytical model and a fully nonlinear finite element (FE) framework have been used to predict the bistable behavior of MFC-bonded active bistable laminates. The FE model has been further utilized for parametric studies to examine the influence of the geometrical parameters of MFC layers in altering the energy landscape. Additionally, the influence of replacing conventional cross-ply laminates with variable stiffness (VS) laminates, generated from curvilinear fiber alignments, on the potential energy landscape has been examined on the best-identified laminate–MFC configuration from the initial FE parametric study. As an outcome, an optimum VS laminate–MFC configuration has been proposed for future investigations.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119239"},"PeriodicalIF":6.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167538","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":"Adjustable stiffness of chain mail fabrics","authors":"Miao Miao Yuan ,&nbsp;Bo Hua Sun","doi":"10.1016/j.compstruct.2025.119237","DOIUrl":"10.1016/j.compstruct.2025.119237","url":null,"abstract":"<div><div>Adjustable stiffness chain mail fabrics, composed of interlocking 3D single-cell particles, attract significant interest for their flexibility, impact resistance, and controllable stiffness. This study aims to investigate the mechanical properties of in-vacuo chain mail fabric through a combination of experimental and numerical simulation methods. First, three different chain mail fabrics composed of various single-cell particles were produced. Subsequently, different external pressures were applied to the fabric to transform it into a load-bearing structure. Finally, three-point bending tests were conducted on the in-vacuo chain mail fabric, and numerical simulations were performed using the finite element software ABAQUS. The research shows that the apparent bending modulus, peak load, and energy absorption capacity of the in-vacuo chain mail fabric increase with the external pressure. When the external pressure reaches 64.5 kPa, the in-vacuo fabric’s apparent elastic bending modulus, peak load, and energy absorption capacity increase by 6 times, 16 times, and 15 times, respectively. Notably, when the three-dimensional particles is square, the in-vacuo fabric exhibits higher load-bearing capacity. Combining the experimental results and numerical simulation results show that the ”tensile contact” and ”compressive contact” between interlocking particles have a significant impact on the overall mechanical properties of the chain mail fabric.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"368 ","pages":"Article 119237"},"PeriodicalIF":6.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147444","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":"Effect of delamination defects on buckling and growth characteristics in composite laminates","authors":"S.S. Venkat ,&nbsp;S. Scheffler ,&nbsp;P.M. Anilkumar ,&nbsp;E. Baranger ,&nbsp;R. Rolfes","doi":"10.1016/j.compstruct.2025.119245","DOIUrl":"10.1016/j.compstruct.2025.119245","url":null,"abstract":"<div><div>Delaminations pose a critical threat to the safety and reliability of composite structures due to increased risk of buckling and further growth under compressive loads. Understanding the interplay between how even seemingly minor interface defects can amplify the risk of buckling and how buckling in turn can affect the growth characteristics of existing delaminations is therefore crucial during the design phase of the structure. In this study, we focus on the column buckling case to get an understanding of growth characteristics of pre-existing delamination under compression. A quasi-static “Effect of Defect” study has been conducted using geometrically nonlinear finite element (FE) simulations. The study has been performed by maintaining a constant applied load while incrementally increasing the delamination length in the models. Different through thickness delamination configurations have been investigated in a generic quasi-isotropic laminate and the configuration with delamination near the laminate surface has been found to be most critical. It is observed that as the delamination length is increased, the laminate initially experiences local buckling. This is followed by unstable growth and a mixed local/global buckling failure when the delamination length reaches a critical size. For this near-surface configuration, the influence of laminate dimensions has been investigated and a comparison has been made between the original quasi-isotropic laminate and a stiffer, zero-dominant laminate. It has been demonstrated that in the stiffer laminate, under the same applied load, local buckling occurs without leading to unstable growth, even for very large delamination sizes. Therefore, in this case, if growth occurs under a service load equalling the applied load, it is expected to remain stable without transitioning to unstable growth. By understanding these distinct growth characteristics within the context of delamination buckling, designers can more effectively develop inspection strategies that improve the monitoring of damage growth.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119245"},"PeriodicalIF":6.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144167537","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 three-component volume coordinate system generalized mixed element for piezoelectric composite structures","authors":"Zhicheng Yong,&nbsp;Yanhong Liu,&nbsp;Weiming Guo,&nbsp;Guanghui Qing","doi":"10.1016/j.compstruct.2025.119318","DOIUrl":"10.1016/j.compstruct.2025.119318","url":null,"abstract":"<div><div>This paper combines the three-component volume coordinate system with the non-conforming generalized mixed element to develop an element for analyzing the static characteristics of piezoelectric composite structures. The element adopts volume coordinates as local coordinates, significantly alleviating the ill-conditioned relationship between local and Cartesian coordinates in traditional isoparametric elements under mesh distortion, thus reducing the sensitivity of the element to mesh distortion. Furthermore, the calculation of the Jacobian inverse matrix is avoided. On the other hand, this element retains the advantage of the mixed method that enables the concurrent consideration of displacement and stress boundary conditions, thereby facilitating an objective and rational description of the finite element model. Additionally, the discontinuity of in-plane stresses between layers is resolved by using a partial mixed method to separately solve the in-plane and out-of-plane stresses. Numerical examples demonstrate that the proposed element has excellent performance in the analysis of piezoelectric composite structures.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"368 ","pages":"Article 119318"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147448","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":"Investigating mechanical enhancement and vibrational response of additive manufactured PLA scaffolds with carbon nanotube and graphene oxide: Fabrication and multi-scale simulation","authors":"Sajad Niazi Angili ,&nbsp;Mohammadreza Morovvati ,&nbsp;Yashar Vatandoust ,&nbsp;Mohammad Fotouhi ,&nbsp;Mahdi Bodaghi","doi":"10.1016/j.compstruct.2025.119320","DOIUrl":"10.1016/j.compstruct.2025.119320","url":null,"abstract":"<div><div>This paper investigates the relationship between nanomaterials concentration, scaffold topologies, and mechanical and vibrational performance of additive manufactured Polylactic Acid (PLA) scaffolds reinforced with Graphene Oxide (GO) and Carbon Nanotube (CNT). Three different scaffold topologies namely Cube, Diamond, and Lattice Diamond were designed. Every scaffold comprised PLA reinforced with GO and CNT at different concentration levels of 0 wt%, 0.2 wt%, 0.4 wt%, and 0.6 wt%. The mechanical performance of scaffolds was evaluated via compressive testing. A representative volume element (RVE) model, evaluated using periodic boundary conditions, was developed and successfully validated against experimental results, with a deviation between 13.5 % to 23 %. The novelty of the work lies in incorporating GO and SWCNT agglomeration within the RVE models, enabling a more accurate comparison with 3D-printed composite test samples. Additionally, a comprehensive evaluation of scaffold shapes, geometry, vibrational response, and reinforcement concentration, provides valuable insights into their performance. Experimental and RVE results indicated that the PLAs reinforced with 0.6 wt% GO and 0.6 wt% CNT experience agglomerations. Finite element simulations using the Mooney-Rivlin hyperelastic model showed that the compressive strength of the structures followed this order: Diamond &gt; Cube &gt; Lattice Diamond. The results showed that increasing GO and CNT content from 0 wt% to 0.4 wt% led the Diamond scaffold to exhibit the greatest improvement in compressive strength and elastic modulus, with increases of 79.3 %, 26 %, 165.9 %, and 129 %, respectively. It was found that the additive manufactured modified PLA Diamond scaffold displays the best mechanical performance among the other scaffold topologies. The finite element analysis using the Lanczos Eigensolver revealed that mechanical enhancements and structural topology directly impact natural frequency variations, making them major parameters to consider for specific applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119320"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166079","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":"Efficient genetic optimization strategy for high temperature broadband absorption/transmittance rasorber","authors":"Shaozhuo Ding,&nbsp;Yiping Li,&nbsp;Rubing Zhang","doi":"10.1016/j.compstruct.2025.119328","DOIUrl":"10.1016/j.compstruct.2025.119328","url":null,"abstract":"<div><div>Frequency-selective-rasorber (FSR) radomes have demonstrated remarkable capabilities in transmitting and absorbing electromagnetic waves. However, with an increase in aircraft flight speeds, FSR radomes struggle to withstand the high-temperature environments generated during flights. Meanwhile, traditional high-temperature frequency-selective-surface (FSS) radomes will fail in stealth against multi-base station radar detection systems. To address these challenges, this paper presents the innovative development of a high-temperature resistant integrated casting quartz fiber matrix. A topological pattern and slit square ring pattern were integrated using an enhanced genetic algorithm, resulting in a transmittance above 70 % within the range of 1.67–2.19 GHz at a thickness of 4.6 mm; its absorptivity within the range of 9.25–18 GHz exceeded 90 %. Notably, the absorption bandwidth of 11 GHz (&gt;80 %) and the passband bandwidth of 2.38 GHz (&gt;50 %) at 700 °C were achieved, leading to the development of a thin FSR that integrates high-temperature resistance, absorption, and transmission. Consequently,<!--> <!-->this study creates avenues for the integration of military communication and stealth technology, presenting a promising application prospect for the development of new stealth radomes.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"369 ","pages":"Article 119328"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166077","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":"Numerical analysis of ultrahigh velocity impact of micro abrasive particles on Cf/SiC composites","authors":"Hankun Bao ,&nbsp;Dun Liu ,&nbsp;Yifei Zhang ,&nbsp;Hongtao Zhu ,&nbsp;Chuanzhen Huang ,&nbsp;Yue Dai ,&nbsp;Jize Zhao ,&nbsp;Ruyi Zhao ,&nbsp;Weijie Zhang","doi":"10.1016/j.compstruct.2025.119322","DOIUrl":"10.1016/j.compstruct.2025.119322","url":null,"abstract":"<div><div>The present study provides an innovative finite element modeling approach to investigate the material removal behavior of distinct shaped abrasive particles impacting different regions and damage mechanisms of C<em>_f</em>/SiC under ultrahigh velocity abrasive particles impact. The simulation results indicate that among the four investigated abrasive shapes, the polygonal prisms abrasives exhibit the best material removal capability, achieving removal rates of 0.440, 0.538, and 0.589 in the matrix region, fiber region, and fiber–matrix interface region, respectively-all exceedingly twice those of spherical abrasives. The study analyzed the reasons why polygonal prisms abrasives exhibit optimal material removal capability from two perspectives: the sphericity and roundness of abrasive particles, and the stress contour plots during abrasive impact on the material. Additionally, compared to pure fiber and matrix regions, the interface between fiber and matrix is more prone to material damage, particularly when using spherical abrasives. Further analyses‌‌ reveal that the main reason for crack damage along the fiber bundle direction is that the C<em>_f</em>/SiC interface layer increases energy dissipation through crack deflection.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"368 ","pages":"Article 119322"},"PeriodicalIF":6.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139248","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":"Study on ballistic protection and flame retardant insulation properties of modified aramid based on metal-ion bridge linkage","authors":"Ke Yan ,&nbsp;Xingyu Shen ,&nbsp;Mengqi Yuan ,&nbsp;Zixuan Fan ,&nbsp;Shaobo Qi ,&nbsp;Hao Wu ,&nbsp;Haoshi Sun ,&nbsp;Yazhuo Qian","doi":"10.1016/j.compstruct.2025.119319","DOIUrl":"10.1016/j.compstruct.2025.119319","url":null,"abstract":"<div><div>By combining macro grafting behavior with the evolution of micro bridging structure, the study explored the fundamental mechanical properties, impact resistance, flame retardancy, and thermal insulation properties of MPP-Cu-MAF. Additionally, the impact resistance, flame retardancy, and thermal insulation mechanisms of MPP-Cu-MAF fabric composites were analyzed. Characterization experiments revealed changes in the chemical structure of the fiber before and after metal ion coordination and MPP grafting modification using the metal ion coordination bridging method. The successful preparation of MPP-Cu-MAF was confirmed, maintaining the integrity of the original material’s crystal structure. Yarn pull-out tests demonstrated a 3.2-fold increase in tensile strength for MPP-Cu-MAF compared to AF, along with improved friction performance. Ballistic tests indicated that MPP-Cu-MAF could increase the ballistic limit velocity (V₅₀) of AF from 51 m/s to 97 m/s, with significant enhancements in SEA and η values. Multi-layer laminated modified composite fiber materials exhibited strong bulletproof performance. Flame retardancy and thermal insulation experiments revealed the mechanisms behind these properties, showing that MPP-Cu-MAF outperformed AF in both aspects. These findings offer theoretical support and an experimental basis for the development and application of MPP-Cu-MAF as new protective materials in engineering practice.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"368 ","pages":"Article 119319"},"PeriodicalIF":6.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147445","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}