Composite Structures最新文献

{"title":"Investigation on failure behavior of 2.5D woven composites in temperature environments by a novel multiscale mechanical-thermal elastoplastic model","authors":"Wenyu Zhang ,&nbsp;Junhua Guo ,&nbsp;Huabing Wen ,&nbsp;Weidong Wen ,&nbsp;Chun Guo ,&nbsp;Yifan Zhang ,&nbsp;Zhirong Yang ,&nbsp;Wantao Guo","doi":"10.1016/j.compstruct.2025.118956","DOIUrl":"10.1016/j.compstruct.2025.118956","url":null,"abstract":"<div><div>2.5D woven composites (2.5DWC) are widely used in aerospace and are often accompanied by complex thermal environments, and many multiscale mechanical models have been proposed to predict the mechanical response and damage behavior in thermal environments. Existing multiscale models make it difficult to consider nonlinear mechanical problems at the yarn level, especially plastic behavior in thermal environments. Herein, a novel multiscale mechanical-thermal elastoplastic progressive damage model for 2.5DWC is proposed to predict the mechanical properties under temperature environment. Different from the traditional hierarchical multiscale approach, this model treats the yarn at mesoscale as a transverse isotropic elastoplastic material, and mechanical-thermal progressive damage models are developed for resin, yarn and carbon fibers, respectively, to characterize the mechanical behaviors of the components at microscale and mesoscale. Subsequently, the effect of temperature on the mechanical properties of 2.5DWC is analyzed based on a homogenization approach, in which the RVE with different volume fractions is used as a bridge to convey the plastic behavior of microscale and mesoscale yarns. Finally, the fracture morphology and stress–strain relationship of the material in a real temperature environment are used to verify the reasonability of the prediction results. This work provides support for advancing the in-depth application of 2.5DWC in aerospace.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118956"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420922","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":"Unified nonlocal surface elastic-based thermal induced asymmetric nonlinear buckling of inhomogeneous nano-arches subjected to dissimilar end conditions","authors":"Saeid Sahmani ,&nbsp;Timon Rabczuk ,&nbsp;Jeong-Hoon Song ,&nbsp;Babak Safaei","doi":"10.1016/j.compstruct.2025.118961","DOIUrl":"10.1016/j.compstruct.2025.118961","url":null,"abstract":"<div><div>The prime ambition of the current exploration is to signify the consequence of surface elasticity together with the nonlocality on the thermal induced asymmetric nonlinear buckling aspects of reinforced functionally graded (FG) porous arches at nanoscale dominated by dissimilar end conditions. The reinforced FG porous nano-arches are subjected to a concentrated load at different locations in conjunction with a thermal surrounding. In this regard, the Gurtin-Murdoch theory (GMT) besides the nonlocal theory (NT) of continuum elasticity are recruited within the exponential shear bendable curved beam formulations to embrace the consequences of the surface Lame parameters along with the surface residual and nonlocal stresses. In order to track down the unified GMT + NT elastic-based nonlinear equilibrium plots attributed to the asymmetric nonlinear buckling of FG porous nano-arches, the isogeometric type of numerical technique is engaged encompassing the knot insertion together with the knot multiplication peculiarities. It is released that for a nano-arch with smaller thickness, the effect of GMT of elasticity embellishes more appreciable, and the quantities of concentrated mechanical loads allocated to all introduced critical points intensify. However, by taking the unified GMT + NT elastic-based model into account, due to the softening consequence of the nonlocality, the role of GMT of elasticity reduces, even for a very thick nano-arch, an opposite feature is observed. Also, it is extrapolated that increasing the temperature does not affect the number of limit points. However, the influence of size dependencies in the both GMT elastic-based and unified GMT + NT elastic-based concentrated mechanical loads at the introduced critical points seems to become more pronounced after inducing the temperature rise.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118961"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Behavior of pultruded I-section GFRP profiles under restrained torsion","authors":"Peng Feng ,&nbsp;Juntian Tang ,&nbsp;Shuxin Liao ,&nbsp;Yuwei Wu ,&nbsp;Yu Bai","doi":"10.1016/j.compstruct.2025.118959","DOIUrl":"10.1016/j.compstruct.2025.118959","url":null,"abstract":"<div><div>This work focused on restrained torsion performance and calculation methods of pultruded GFRP I-section profiles. Material shear properties were tested by V-notched tests, showing significant material nonlinearity. Restrained torsion tests were conducted for six I-section profiles. Three I-section failure modes were found: local buckling failure caused by restrained normal stress at the end, shear failure of the flange-web junction at the midspan and compression failure at the end. Subsequently, finite element analysis was conducted. UMAT based on Puck model was utilized to consider the nonlinearity of shear properties, and simulations and experiments agreed well. Shear property nonlinearity had little influence on the I-section restrained torsion behavior. Vlasov theory was extended to orthotropic materials. The formula of local buckling caused by restrained normal stress was developed based on energy theory. Furthermore, calculation methods to predict restrained torsion failure were proposed and compared; the proposed methods were the most effective.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118959"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421121","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":"Isogeometric topology optimization for innovative designs of the reinforced TPMS unit cells with curvy stiffeners using T-splines","authors":"Xiao Zhang ,&nbsp;Mi Xiao ,&nbsp;Wei Luo ,&nbsp;Liang Gao ,&nbsp;Jie Gao","doi":"10.1016/j.compstruct.2025.118955","DOIUrl":"10.1016/j.compstruct.2025.118955","url":null,"abstract":"<div><div>The parametric designs for the Triply Periodic Minimal Surfaces (TPMS) have been widely discussed due to flexible adjustments of structural performance using mathematical equations. However, the only change of structural shape and thickness in TPMS using few parameters extensively poses more challenges on the improvement of concerned performance. In the current work, the main intention is to propose an innovative design method for TPMS unit cells with the reinforced performance using a combination of the T-splines-oriented Isogeometric Topology Optimization (T-ITO) method and the double offset strategy. Firstly, the T-splines with powerful capability and superior flexibility are applied to model structural geometries of TPMS unit cells accurately, which can effectively remove the limitations of previous B-splines. Secondly, the IGA (IsoGeometric Analysis) with T-splines, which can effectively ensure the consistency of structural geometry and numerical analysis, is adopted to implement the shell analysis of TPMS unit cells to maintain the high-precision, even if complex geometries are considered. Thirdly, the T-ITO formulation is developed to improve the loading-capability of TPMS unit cells, in which materials can be reasonably distributed within the design domain of unit cells. Fourthly, the double offset strategy is employed to construct a series of reinforced TPMS unit cells enhance structural performance as much as possible, where the curvy stiffeners can be rationally generated based on T-ITO method in the reinforcement layer of unit cells. Finally, several numerical examples are addressed to demonstrate the effectiveness of the proposed innovative design method for TPMS, which clearly show the reinforced TPMS unit cells with shell-plate-beam combined designs have preferable stiffness, yield strength and energy absorption characteristics.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118955"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395393","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":"Kresling origami structure: Mechanical and aerodynamic drag characteristics","authors":"Ji Zhang ,&nbsp;Shuai Liu ,&nbsp;Tianyu Gao ,&nbsp;Changguo Wang","doi":"10.1016/j.compstruct.2025.118962","DOIUrl":"10.1016/j.compstruct.2025.118962","url":null,"abstract":"<div><div>This study explores the design and application of Kresling origami structures for efficient one-way airflow control in intelligent ventilation and air flow regulation. The mechanical properties of the Kresling origami structure were examined using the finite particle analysis and the finite element method. The Kresling origami configuration of shape memory polymer was fabricated using 3D printing technology, followed by the execution of mechanical experiments, and the finite element analysis results were juxtaposed with experimental data to elucidate the mechanism. Then, the analysis of the flow field characteristics of the Kresling origami structure includes examination of the drag force properties of both single cell and array structures. The comparison shows that array structures offer better flow resistance than single-cell configurations. Additionally, the impact of the ventilation mechanism and double-layer structure on the drag force is investigated. Results indicate that Kresling origami structures exhibit varying drag force properties depending on folding states and wind direction, enabling efficient airflow regulation. The integration of non-reciprocal structures with double-layer Kresling origami is examined, demonstrating the potential of origami structures in intelligent ventilation, offering valuable insights for their application in fluid mechanics.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118962"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403731","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":"Lightweight design of tensegrity Michell truss subject to cantilever loads","authors":"Xiaolong Bai ,&nbsp;Muhao Chen","doi":"10.1016/j.compstruct.2025.118925","DOIUrl":"10.1016/j.compstruct.2025.118925","url":null,"abstract":"<div><div>This study introduces an analytical design approach for lightweight cantilever tensegrity structures based on the Michell truss pattern. The topological configuration is determined by generating the parameters of Michell spirals, including structural complexity and geometric parameters. The static equilibrium analysis reveals that the force per unit load for each member is determined by the direction angle of the load, the outer and inner radii of the spiral pattern, and the structural complexity. A minimal mass optimization algorithm is employed to compute the optimal complexity of the cantilevered system, subject to yielding and buckling failure constraints. Numerical calculations are conducted to verify the lightweight design theory for cantilevered structures in relation to load magnitude, load direction, lever arm distance, and material choices. The results not only validate the design methodology for tensegrity structures but also advocate for an innovative structural design approach that integrates parametric theoretical analysis and numerical optimizations for diverse loading scenarios.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118925"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387986","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":"Deflation constraints for global optimization of composite structures","authors":"Sankalp S. Bangera ,&nbsp;Saullo G.P. Castro","doi":"10.1016/j.compstruct.2025.118916","DOIUrl":"10.1016/j.compstruct.2025.118916","url":null,"abstract":"<div><div>The study presents deflation constraints that enable a systematic exploration of the design space during the design of composite structures. By incorporating the deflation constraints, gradient-based optimizers become able to find multiple local optima over the design space. The study presents the idea behind deflation using a simple sine function, where all roots within an interval can be systematically found. Next, the novel deflation constraints are presented: hypersphere, hypercube and hypercuboid; consisting of a combination of Gaussian and sigmoid functions. As a test case, the developed constraints are applied to the optimization of a double-cosine function, where all the 13 minima points could be found with 24 deflation constraints. It is shown that a new optimum is encountered after each deflation constraint is added, with the optimization subsequently re-started from the same initial point, or resumed from the last found minimum, being the latter the recommended approach. The new deflation constraints are then used in heuristic-based direct search methods, where a genetic algorithm optimizer is able to find new optimum individuals for straight-fiber composites. Lastly, variable-stiffness composites were designed with the deflation constraints applied to the multimodal optimization problem of recovering fiber orientations from a set of optimum lamination parameters.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118916"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical and experimental study on natural vibration and Snap-Through of piezoelectric bistable asymmetric laminated composite cantilever plates under hygroscopic influence","authors":"Y.D. Jiang ,&nbsp;W. Zhang ,&nbsp;Y.F. Zhang ,&nbsp;X.T. Guo ,&nbsp;A. Amer","doi":"10.1016/j.compstruct.2025.118952","DOIUrl":"10.1016/j.compstruct.2025.118952","url":null,"abstract":"<div><div>This paper investigates the influence of the hygroscopic stress field on the natural vibration and snap-through dynamics of the piezoelectric bistable asymmetric laminated composite (BALC) cantilever plates. A theoretical model considering the hygroscopic effects is established and validated through the finite element (FE) method and experiments. The impacts of the moisture absorption and geometric parameters on the vibration responses of the piezoelectric BALC cantilever plates are analyzed. The third-order shear deformation theory and von Kármán nonlinear strain–displacement relationships are utilized for the modeling, and the energy equation is established. The multi-parameter polynomial, Chebyshev polynomial and Rayleigh-Ritz method are employed to determine the static configurations and modes of the piezoelectric BALC cantilever plates. The force–displacement relationship is derived by using the principle of the virtual work for the static snap-through analysis. The results indicate that the moisture ingress affects the natural characteristics, bistable characteristics, reducing curvature and altering critical load thresholds. Notably, at high humidity levels, piezoelectric BALC cantilever plates exhibit a configuration inversion phenomenon. This paper provides a theoretical foundation and practical guidance for designing and applying the piezoelectric BALC cantilever plates in variable moisture environments.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"358 ","pages":"Article 118952"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427548","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 novel numerical methodology for the simulation of unstable debonding growth in aerospace stiffened composite panels","authors":"R. Castaldo,&nbsp;A. Russo,&nbsp;V. Acanfora,&nbsp;A. Riccio","doi":"10.1016/j.compstruct.2025.118957","DOIUrl":"10.1016/j.compstruct.2025.118957","url":null,"abstract":"<div><div>The growth of interlaminar damage under various loading conditions can be a significant factor in the integrity of aerospace composite components. This phenomenon can be extremely dangerous under cyclic loading conditions, potentially leading to structural collapse due to the rapid decrease in strength and stiffness of the material with loading cycles. In order to enhance comprehension of the mechanisms underlying damage evolution and interaction in composite materials, a combination of numerical and experimental methodologies is frequently employed. This approach facilitates the development of safe composite components for aerospace applications. Indeed, the most advanced fatigue numerical tools simulate the evolution of damage in composite structures by adopting static analyses in conjunction with appropriate material properties degradation rules. The numerical analyses are typically conducted under load control, thereby accounting for the cyclical nature of the applied load. This simulation approach is often inadequate when dealing with unstable interlaminar damage growth phenomena, which are related to sudden variations in geometry and damage status. An accurate simulation of unstable damage growth necessitates the utilisation of a tool that accounts for dynamic effects, including mass and damping matrices, which are typically incorporated into transient analysis. However, transient analyses are computationally expensive and may require a considerable investment of time to complete. The current methodologies for simulating interlaminar damage evolution have yet to achieve a satisfactory level of robustness and effectiveness for this highly dynamic event. Accordingly, the objective of this research is to simulate a dynamic phenomenon, such as the propagation of fatigue-driven unstable delaminations, using a more efficient static approach. In particular, this study aims to introduce an efficient numerical methodology that can overcome the issues related to the sudden variations of geometry and damage status. The proposed methodology employs the Virtual Crack Closure Technique (VCCT) and the Paris’ law to utilise a series of nonlinear iterations, with a hybrid displacement-load control approach, in order to emulate the highly dynamic behaviour associated with unstable interlaminar damage growth. The proposed methodology has been implemented in the ANSYS FEM software via the parametric APDL language and has been successfully preliminary tested on an artificially debonded composite stiffened panel under compression-compression fatigue loading conditions.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118957"},"PeriodicalIF":6.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421048","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":"High-performance W-Cu composite with a layered hierarchical structure","authors":"Yijing Wang ,&nbsp;Yaochuan Sun ,&nbsp;Tielong Han,&nbsp;Zhi Zhao,&nbsp;Chao Hou,&nbsp;Yurong Li,&nbsp;Xiaoyan Song","doi":"10.1016/j.compstruct.2025.118954","DOIUrl":"10.1016/j.compstruct.2025.118954","url":null,"abstract":"<div><div>Conventional tungsten-copper (W-Cu) composites typically exhibit a homogeneous distribution of tungsten phase. However, there usually exists an trade-off between their mechanical properties and conductivity, thereby significantly limiting their potential applications. In this study, a novel approach was proposed to concurrently enhance the compressive strength, wear resistance, and electrical conductivity by constructing a layered hierarchical structure consisting of alternating copper layers and nano W-Cu layers. Compared with the uniform-structured W-Cu, it was found that the layered hierarchical W-Cu had an enhanced stress partitioning of the tungsten phase and a more concentrated distribution of current density in the copper layer. This resulted in improvements in both strength and conductivity. Furthermore, the development of a homogeneous oxide mixture layer on the wear scar surface contributes to a reduction in friction coefficient. When combined with the exceptional strength of the nanostructured W-Cu layer, the wear resistance of the layered hierarchical W-Cu was enhanced. This study highlights the pivotal role of multilevel structural design in development of high-performance bimetallic composites.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"357 ","pages":"Article 118954"},"PeriodicalIF":6.3,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387983","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}