Composite Structures最新文献

{"title":"Three-dimensional annular negative stiffness honeycomb structure design and performance study","authors":"Yangyang Dong,&nbsp;Fangzhi Yan,&nbsp;Zijian Zhang","doi":"10.1016/j.compstruct.2025.119229","DOIUrl":"10.1016/j.compstruct.2025.119229","url":null,"abstract":"<div><div>This paper introduces a novel three-dimensional annular negative stiffness honeycomb (ANSH) structure. Initially, a variety of center angles were used to design a negative stiffness honeycomb (NSH) structure, based on NSH theory principles. Finite element methods were applied to analyze its negative stiffness and mechanical properties under compression, identifying the optimal angle for unit structure. Subsequently, multiple layers were stacked to develop the three-dimensional ANSH structure. Quasi-static compression simulations and experiments with different layer counts demonstrated that the new NSH structure’s mechanical properties and energy absorption capabilities improve with increasing layer count. Moreover, for three-layer honeycomb structures with identical unit numbers, the three-layer NSH structure can withstand a maximum force threshold 1.55-fold higher than the three-layer OH structure when beam thickness is constant, and its energy absorption increases by 1.43-fold. Despite a 2.57-fold increase in beam thickness for the three-layer OH structure under the same mass, the mechanical properties and energy-absorption performance of the three-layer NSH structure remain comparable, and cyclic experiments indicate that it has superior repeatable energy-absorption characteristics. The printed structure shows self-recovery after deformation and effective shock absorption under various loading conditions, ensuring traversal capability and maintaining motion performance post-obstacle crossing, indicating significant potential for engineering applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119229"},"PeriodicalIF":6.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908139","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 enhanced shear-lag model considering temperature-dependent whisker fracture and de-bonding mechanism for TiB whisker-reinforced titanium matrix composites","authors":"Jiahui Guo ,&nbsp;Wenzhen Chen ,&nbsp;Yong Hou ,&nbsp;Ke Wei ,&nbsp;Changjing Zhang ,&nbsp;Jiabin Hou ,&nbsp;Yi Cao ,&nbsp;Guorong Cui ,&nbsp;Wencong Zhang ,&nbsp;Myoung–Gyu Lee","doi":"10.1016/j.compstruct.2025.119222","DOIUrl":"10.1016/j.compstruct.2025.119222","url":null,"abstract":"<div><div>Accurately evaluating whisker contributions to high-temperature strength is crucial for advancing TiB whisker-reinforced titanium matrix composites (TMCs). A key challenge lies in quantitatively characterizing temperature-dependent whisker fracture and interfacial de-bonding. This study enhances the shear-lag model by incorporating micromechanical analysis of distinct failure modes and systematically investigates the tensile failure behaviors of TiBw/TC4 TMCs over the temperature range of 25–700 °C. Experimental results reveal a transition from whisker fracture below 260 °C to de bonding above 450 °C, with mixed failure modes observed between 260 °C and 450 °C. Complete failure occurs at 650 °C. The enhanced model effectively captures these transitions with varied temperatures. In fracture and mixed failure regions below 500 °C, whisker strengthening factors of 11 14 and strengthening efficiencies of 30–70 MPa/vol.% were quantified, highlighting the significant role of whiskers in reinforcement. Moreover, increasing the whisker aspect ratio in de-bonding regions preserves strengthening efficiency and identifies critical fracture aspect ratios as the optimal whisker size for performance enhancement. The model’s accuracy and predictive capability are validated against tensile experiments and literature data. This study provides a simple effective method for strength prediction, offering valuable guidance for high-temperature property design and advanced composite development.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119222"},"PeriodicalIF":6.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892062","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":"Investigation of the evolution and movement of volatile bubbles in the process of curing polyimide composites by in-situ observation","authors":"Tao Yang ,&nbsp;Jing Zhou ,&nbsp;Yingguang Li ,&nbsp;You Shi ,&nbsp;Xicheng Heng ,&nbsp;Xiaozhong Hao ,&nbsp;James Gao","doi":"10.1016/j.compstruct.2025.119224","DOIUrl":"10.1016/j.compstruct.2025.119224","url":null,"abstract":"<div><div>Polyimide composites offer the unique characteristics of excellent thermal resistance required for aerospace structures. However, in the process of curing polyimide composites, large amounts of volatiles are generated, which cause many voids in the cured composites. Understanding the mechanism of bubble evolution and movement caused by volatiles during composite curing processing is important for removing voids. This research developed an experimental platform for in-situ observation and investigated the complicated bubble evolution process (nucleation, growth, coalescence, and rupture) in polyimide resin and composites under both atmosphere and vacuum conditions. It revealed that the evolution and movement of bubbles mainly happened in narrow channels between fibers, and bubbles moved outward violently along fiber direction under vacuum condition, even causing fiber buckling. Based on the experiments, a new idea of introducing additional flow channels into polyimide composites was proposed, which greatly facilitated the removal of volatile bubbles and reduced voids in cured composites.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119224"},"PeriodicalIF":6.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898831","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":"Regularisation in Direct FE2 multiscale modelling of fused-filament fabricated parts","authors":"Rahul Singh Dhari ,&nbsp;Wayne Hall ,&nbsp;Stefanie Feih ,&nbsp;Zia Javanbakht","doi":"10.1016/j.compstruct.2025.119180","DOIUrl":"10.1016/j.compstruct.2025.119180","url":null,"abstract":"<div><div>This study investigated regularisation methods in Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> failure analysis of fused-filament fabricated (FFF) parts modelled as fibre-reinforced composites. Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> technique offers simplicity with moderate computational cost by incorporating microstructural variations of FFF parts into macroscopic constitutive behaviour. However, similar to conventional FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> methods, loss of positive-definiteness in tangent stiffness matrix occurs at structural level because of the material-level strain localisation and softening behaviour. Further numerical complexity is added when element deletion technique (EDT) is employed; an aspect which remains unexplored for Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>. To address these issues, three regularisation methods (fracture energy, viscous, and combined schemes) were implemented in Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> analyses with EDT and their performance was evaluated in predicting the stiffness, strength, and deformation modes of poly(lactic) acid FFF parts with varying ductility. The results of Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> numerical analyses were compared to regular FE predictions and experimental tensile samples manufactured with different raster angles. It was found that unregularised Direct FE<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> simulations suffered from convergence issues and the effectiveness of the regularisation method depended on material ductility, i.e., while some regularisation schemes could alleviate instabilities, others made an unrealistic prediction of failure mechanism. The combined regularisation approach was most effective in predicting ductile (0°) and moderately-ductile (mixed-mode, 45°) behaviour whereas fracture energy approach was best-suited for brittle failures (90°). The viscous regularisation tended to initiate EDT prematurely while combined regularisation provided more realistic depiction of microstructural deterioration.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119180"},"PeriodicalIF":6.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892061","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":"Constitutive modelling of time-dependent polymer matrix composites: Incorporating a visco-hyperelastic model into the micromechanical framework","authors":"Wenlong Li ,&nbsp;Shiyu Wu ,&nbsp;Jianguo Zhu ,&nbsp;Lili Zhang ,&nbsp;Jing Zheng ,&nbsp;Haojing Wang ,&nbsp;Yaping Qiu ,&nbsp;Guihua Xie ,&nbsp;Cheng Li","doi":"10.1016/j.compstruct.2025.119220","DOIUrl":"10.1016/j.compstruct.2025.119220","url":null,"abstract":"<div><div>Accurately modelling the stress–strain response of carbon fiber reinforced polymer composites (CFRPs) at high strain rates remains challenging due to the nonlinear time-dependent behavior of the polymer matrix. In this work, we develop and validate a new micromechanics-based constitutive model that, for the first time, integrates a single-relaxing-component visco-hyperelastic formulation, also called internal state variable model, into the method of cells (MoC). To account for the effects of shear stress concentration at the fiber–matrix interface, a scaling parameter is introduced in the matrix overstress term. For brittle thermoset matrices, a degraded pseudo tensile yield stress is implemented to represent interface de-bonding during the early loading stage. To capture the pronounced nonlinear stress–strain characteristics of CFRPs, a monotonically increasing resistant stress term is employed in the matrix flow rule. The proposed model successfully predicts the off-axis tensile responses at various strain rates for three kinds of composites, including both thermoplastic and thermoset matrix composites, with carbon fiber moduli ranging from 200 GPa to 300 GPa. This favourable validation indicates that a more comprehensive visco-hyperelastic formulation with multiple relaxing components for the polymer matrix can be readily incorporated into the current framework, thus enabling accurate predictions for CFRPs at higher strain rates.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119220"},"PeriodicalIF":6.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898661","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":"Development of an effective modelling method for the mechanical analysis of submarine power cables under bending","authors":"Pan Fang ,&nbsp;Xiao Li ,&nbsp;Xiaoli Jiang ,&nbsp;Hans Hopman ,&nbsp;Yong Bai","doi":"10.1016/j.compstruct.2025.119198","DOIUrl":"10.1016/j.compstruct.2025.119198","url":null,"abstract":"<div><div>The complex interplay of numerous helical components within submarine power cables (SPCs), especially those with significant contact issues due to initial residual stress, complicates their modelling and limits our understanding of these structures. In this paper we proposed an effective modelling method designed for the local mechanical analysis of SPCs under bending. The method was developed based on three key aspects: (1) constructing appropriate finite elements to reduce the number of elements required; (2) employing contact damping to address the effects of initial residual stress at contact interfaces; and (3) applying periodic boundary conditions on a repeated unit cell (RUC) to reduce the model size. The accuracy of this method was validated through extensive testing on both single-core and three-core SPC samples, and its efficiency was confirmed by comparing these results with those obtained from traditional full-scale models. Following validation, the model was employed to illustrate the local mechanical behaviours of SPCs under bending, both at the overall level and at the component level. This model serves as a powerful tool for cable engineers, offering deeper insights into the internal interplays of SPCs. All relevant codes developed in this paper are freely available at <span><span>https://pan-fang.github.io/Codes/</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119198"},"PeriodicalIF":6.3,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873905","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":"Biomimetic polypropylene-carbon intra-ply hybrid 3D woven composite with enhanced impact resistance","authors":"Anna Weatherburn ,&nbsp;Callum Montgomery ,&nbsp;George Scott ,&nbsp;Calvin Ralph ,&nbsp;John Girkin ,&nbsp;Cormac McGarrigle ,&nbsp;Alistair McIlhagger ,&nbsp;Edward Archer ,&nbsp;Stefan Szyniszewski","doi":"10.1016/j.compstruct.2025.119177","DOIUrl":"10.1016/j.compstruct.2025.119177","url":null,"abstract":"<div><div>In this study, a nacre-inspired carbon-polypropylene 3D woven composite is developed. The biomimetic ‘brick-and-mortar’ design is implemented by interlacing softer polypropylene yarns with brittle carbon fibres. This novel composite was benchmarked against a standard carbon fibre 3D woven composite with identical weave architecture, examining tensile properties, impact resistance, and shear strength. The comparative analysis was supported by micrographs and <span><math><mi>μ</mi></math></span>CT scans. Results showed that the hybrid composite absorbed 16% more impact energy in the weft direction than its purely carbon counterpart. The presence of polypropylene yarns increased crimp within the weave contributing to reduced tensile and shear properties. The study identifies the bulk factor of polypropylene yarns as critical in minimising crimp and structural flaws in the hybrid design. In summary, this work presents a nature-inspired hybrid composite, with an increased impact resistance but with trade-offs in tensile and shear properties.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119177"},"PeriodicalIF":6.3,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903750","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":"Reinforcing shell elements for fiber-reinforced composites undergoing large deformations and general motion","authors":"Yanhu Li ,&nbsp;Yongjie Lu ,&nbsp;Jibo Song ,&nbsp;Linao Zhang","doi":"10.1016/j.compstruct.2025.119195","DOIUrl":"10.1016/j.compstruct.2025.119195","url":null,"abstract":"<div><div>Fiber-reinforced composites offer excellent mechanical properties and lightweight advantages in multibody systems. However, their significant anisotropy and geometrical and material nonlinearities present challenges for accurate modeling and simulation. In this paper, two new types of reinforcing shell elements are developed within the Absolute Nodal Coordinate Formulation framework. The first type assumes that each fiber behaves as an Euler beam with only tensile and bending stiffness, making it suitable for simulating reinforcing fibers with arbitrary orientations and nonuniform materials and cross-section areas. The second type employs elastic force formulation based on Kirchhoff–Love theory or continuum mechanics. It is suitable for simulating reinforcing fibers that appear in a layered form with unique orientation, material, and cross-section area. The fibers and matrix are described independently in these new reinforcing elements, coupled through consistent deformation compatibility conditions. This approach allows different material models and element formulations for the fibers and matrix to be used. Furthermore, multiple fibers (or layers) can be embedded within a single reinforcing shell element, providing more accurate representations of the actual physical structure. The effectiveness of the developed reinforcing elements is validated through several benchmark problems. Numerical results demonstrate that both types of reinforcing shell elements are locking-free and can automatically capture the reinforcing effects of the fibers and the coupled deformation modes. This investigation enriches the element library of the Absolute Nodal Coordinate Formulation and provides an effective tool for the accurate simulation and optimal design of fiber-reinforced composites in multibody systems.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119195"},"PeriodicalIF":6.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867943","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":"Design and analysis of the thick-wall cylindrical origami metamaterials based on tessellation principles","authors":"Zihang Ma ,&nbsp;Keyao Song ,&nbsp;Jaehyung Ju ,&nbsp;Yongbin Wang ,&nbsp;He Jia ,&nbsp;Xiang Zhou","doi":"10.1016/j.compstruct.2025.119182","DOIUrl":"10.1016/j.compstruct.2025.119182","url":null,"abstract":"<div><div>Origami structures with embedded creases provide predesigned deformed paths that could enhance the mechanical properties upon loading. Nature has provided hints from the cross-section of the hexagon-filled tessellation pattern of the bamboo and the porous protective layer of the pomelo peel, but the design method of the mechanical metamaterials that combines both energy absorption and protection capacities remains unknown. Inspired by this, the novel design method of the thick-wall cylindrical origami-based metamaterials (TCOM) derived from different tessellation patterns is provided, and both capacities are studied under two loading cases. The main parameters, such as layer heights ranging from <span><math><mrow><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></math></span> to <span><math><mrow><mn>10</mn><mspace></mspace><mi>mm</mi></mrow></math></span> and rotation angles of 1°, 3°, and 5°, are varied to investigate their influence on these two capacities. The results show that these two capacities are generally incompatible, and the mixed polygon tessellation patterns stand out. We found that the specific energy absorption (SEA) capacity could be inversely programmable from the parametric study results, hence an optimization method based on the Gaussian Process Regression is provided as a design tool by a simple input of a user-preferred SEA value, hence providing a programmable energy-absorption capacity design tool for the future applications of the cylindrical origami-based mechanical metamaterials. The research here sheds light on the effects of tessellation design principles on origami-based mechanical metamaterial design.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"366 ","pages":"Article 119182"},"PeriodicalIF":6.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876951","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":"Microstructural shape optimization method for natural vibration design of laminated porous shell structures","authors":"Ayu Kamiya ,&nbsp;Masatoshi Shimoda ,&nbsp;Musaddiq Al Ali","doi":"10.1016/j.compstruct.2025.119184","DOIUrl":"10.1016/j.compstruct.2025.119184","url":null,"abstract":"<div><div>In this paper, we propose an optimization method for designing the microstructural geometry of a laminated shell structure to maximize its vibration eigenvalue. The material properties of the porous components are determined using the homogenization method, resulting in multiple homogenized elastic tensors and densities, which are applied to the corresponding subdomains of the laminated shell structure. To avoid the issue of repeated eigenvalues, we introduce the KS (Kreisselmeier and Steinhauser) function during the maximization process. We formulate the area-constrained microstructure optimization as a distributed-parameter optimization problem, deriving the shape gradient function theoretically using the Lagrange multiplier method, the adjoint variable method and the material derivative method. The microstructures are then optimized with the H¹ gradient method utilizing the derived shape gradient function. The effectiveness of the proposed method is verified through numerical examples. Numerical results demonstrate that the optimized microstructural shapes lead to increased vibration eigenvalues. Also, in order to confirm the validity of the optimization results obtained by numerical calculation, prototypes that combine removal processing using a laser and additive processing using adhesive are fabricated, and experimental evaluations are performed.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119184"},"PeriodicalIF":6.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908138","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}