Composite Structures最新文献_第10页

Mode I delamination propagation of thermoplastic composite laminate at different temperatures: Experimental and numerical simulation

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

Composite Structures

Pub Date : 2025-03-19 DOI: 10.1016/j.compstruct.2025.119096

Zhaoxin Yun , Shaowei Zhu , Liming Chen , Xin Pan , Jianqiang Deng , Hangyu Fan , Weiguo Li

Thermoplastic composites, appreciated for their lightweight, high specific strength, excellent energy absorption, and crash resistance, are gaining popularity in aerospace, automotive, and marine industries. High-temperature environments can lead to the degradation of inter-laminar stresses and component performance. To assure the credible application of thermoplastic composites during service environments, an in-depth analyze of the relationship between the inter-laminar properties and temperature is essential. In this study, the effect of temperature on the process of delamination propagation in thermoplastic composite structures was analyzed by performing delamination propagation tests of double cantilever beam (DCB) at different temperatures. The results show that temperature has an important effect on fracture toughness, delamination propagation rate, delamination propagation resistance curve (R-curve), and the number of fiber bridges. The bridging traction at the interface of the thermoplastic composite plate decreases with increasing temperature. The fracture toughness

G_{I}

were reduced by 67.5%, 72.4% and 85.1% at temperatures of 40℃, 60℃ and 80℃, respectively, compared to the room temperature. Finally, the obtained traction-separation relationship was integrated into trilinear cohesive zone mode considering the effect of temperature. The numerical results were agreement with the experimental results, evidencing that the proposed trilinear cohesive zone mode was suitable for modeling the delamination propagation of thermoplastic composite laminates at high temperatures.

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引用次数: 0

Impact of delamination on mechanical performance of glass fiber-reinforced composites by experiments and data-driven model

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

Composite Structures

Pub Date : 2025-03-19 DOI: 10.1016/j.compstruct.2025.119068

Zhang Senlin , Wu Zhen , Xu Lingbo

Delamination is usually induced by the manufacturing process and extreme external loads, which significantly threaten the load-bearing capacity of the structures. To reduce the influence of delamination, it is desired to investigate the influencing mechanism of delamination on the mechanical performance of the composite laminates. To this end, 14 types of glass fiber-reinforced polymers (GFRP) unidirectional composite plates with or without circular delamination are fabricated, in which the delaminations are designed in different diameters and locations along the thickness. Subsequently, the static three-point bending tests are performed, in which the test techniques including high-speed camera, digital image correlation (DIC), scanning electron microscope (SEM), and metallographic microscope are employed to measure the damage behaviors. When delamination is close to the upper surface, the experiments show that the layers between the delamination and the upper surface will occur local buckling with the increase of the delamination scale. Local buckling will accelerate delamination growth, whereas such an issue is scarcely reported in the published literature. In addition, the fiber bridging phenomenon can also be observed, which should be considered in the numerical analysis. Compared to the intact specimen, the bending strengths of the specimens with delamination at the location close to the upper surface are reduced by between 12.22% and 30.46%, while those of the specimens with delamination at the location close to the bottom surface are reduced by between 4.56% and 17.08%. To explore more influences of delamination on bending behaviors, an artificial neural network model (ANNM) has been constructed, which can quickly and accurately predict the bending strength of such structures. Such a method will be employed to investigate the bending strength degradation with different delamination sizes.

分层通常由制造过程和极端外部载荷引起，严重威胁结构的承载能力。为了减少分层的影响，我们希望研究分层对复合材料层压板机械性能的影响机理。为此，我们制作了 14 种带或不带环形分层的玻璃纤维增强聚合物（GFRP）单向复合材料板，其中的分层被设计成不同的直径和沿厚度方向的位置。然后进行静态三点弯曲试验，利用高速相机、数字图像相关（DIC）、扫描电子显微镜（SEM）和金相显微镜等试验技术测量损伤行为。实验表明，当分层靠近上表面时，分层与上表面之间的层会随着分层尺度的增大而发生局部屈曲。局部屈曲会加速分层的增长，而这种问题在已发表的文献中鲜有报道。此外，还可以观察到纤维架桥现象，这在数值分析中应加以考虑。与完整试样相比，在靠近上表面位置出现分层的试样的抗弯强度降低了 12.22% 至 30.46%，而在靠近下表面位置出现分层的试样的抗弯强度降低了 4.56% 至 17.08%。为了探索分层对弯曲行为的更多影响，我们构建了一个人工神经网络模型（ANNM），该模型可以快速准确地预测此类结构的弯曲强度。这种方法将用于研究不同分层尺寸下的弯曲强度退化。

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引用次数: 0

Collaborative control of crack guiding and trapping in bioinspired interfaces on effective toughness

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

Composite Structures

Pub Date : 2025-03-18 DOI: 10.1016/j.compstruct.2025.119094

Shihan Man , Hongjun Yu , Jianshan Wang

Interface phases are frequently employed to allow deformation and energy absorption to improve the toughness of biological materials. To explore the design space, a combination of the phase field model and 3D printing is adopted to investigate the fracture behaviors of the interface phase and the effective toughness of bioinspired materials. For the heterogeneous interface phase with smooth Young’s modulus, the period number of the smoothing modulation of Young’s modulus is positively correlated with the far-field J while it has a slight influence on the near-tip J. It indicates that effective toughness can be enhanced by increasing the period number of Young’s modulus. In the case where two Young’s moduli alternate along the interface, the effective toughness is highly dependent on the inclined angle of the compliant-to-stiff interface due to stress fluctuations caused by mismatched elastic parameters and crack nucleation. The experimental test of a 3D-printed bioinspired gradient interface indicates that weak interface phases guide crack propagation while strong interface phases trap cracks. For the structured interface phase, interlocking regions prevent the crack from continuing to propagate and the effective toughness exhibits the directional asymmetry. In all, crack guiding and trapping in the interface phase collaboratively control the effective toughness.

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引用次数: 0

Microstructure formation and friction and wear properties of WC steel matrix configuration composites with different matrices

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

Composite Structures

Pub Date : 2025-03-18 DOI: 10.1016/j.compstruct.2025.119098

Zulai Li , Yifan Shi , Fei Zhang , He Wei , Zhixiang Yang , Lin Yang , Quan Shan

The impact of diverse matrices on the microstructure and friction wear characteristics of WC matrix composites has been the subject of investigation. In this study, three types of WC matrix composites with different matrices compositions were prepared using the casting infiltration method. The matrices employed were high manganese steel, high chromium cast iron, and high carbon steel. The microstructure and phase composition of the WC steel composites with different matrices have been investigated using a range of analytical techniques, including scanning electron microscopy (SEM), energy spectroscopy (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and field transmission electron microscopy (HRTEM). This paper presents the findings of an investigation into the friction and wear properties of different matrices WC steel matrix composites. The high manganese steel sample is primarily composed of α-Fe, Fe₃W₃C, and Cr₇C₃, while the high chromium cast iron and high carbon steel specimen are predominantly constituted by α-Fe, Fe₆W₆C, and Cr₇C₃. The Fe₆W₆C phase formed in the high carbon steel sample exhibits both [1, 1, −1] and [-1,1–6] as the zone axis. The hardness, friction coefficient and wear rate of the high carbon steel samples were superior, with values of 751.13 HV, 0.60 and 10.31*10^-5mm³/(N*m) respectively. Under identical conditions, the wear resistance is fourfold that of the high manganese steel sample and 70 % that of the high chromium cast iron sample. The superior wear resistance of the high carbon steel specimen is likely attributable to the distinctive shape and orientation of the Fe₆W₆C composite zone.

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引用次数: 0

The R-functions combined with the Ritz method: An assessment on the integration schemes

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

Composite Structures

Pub Date : 2025-03-18 DOI: 10.1016/j.compstruct.2025.119066

R. Vescovini

This work introduces a method based on the combination of the R-functions and the Ritz method for the static and free vibration analysis of plates, overcoming several limitations commonly associated with Ritz-based approaches. The proposed method enables the study of arbitrary geometries, boundary conditions, and loading configurations while also allowing for the analysis of plates with spatially varying stiffness distributions. The study focuses on the integration techniques employed to construct the governing equations, proposing a novel sub-cell representation method. This approach ensures both robustness and simplicity in implementation, while providing an accurate domain representation and enhanced computational efficiency. Through a series of representative numerical examples and comparisons with benchmark solutions, the influence of integration techniques on solution accuracy and the Ritz upper bound property is examined. The results demonstrate the superior performance of the proposed methodology compared to existing techniques, establishing it as a promising alternative for structural analysis applications.

引用次数: 0

Simulation of biodegradable behaviour of magnesium wire/polylactic acid composite for bone fracture healing under human body environment

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

Composite Structures

Pub Date : 2025-03-17 DOI: 10.1016/j.compstruct.2025.119075

Jia-le Che, Ho-Seok Lee, Seung-Hwan Chang

This study was aimed at developing a technique for simulating the material degradation of a biodegradable composite comprising magnesium wires as reinforcement and polylactic acid as the matrix using a phosphate-buffered saline (PBS) solution in a simulated human body environment. For accurate simulation, parameters like the diffusion coefficients of each component of the composite were considered by referring to previous researches on degradation experiments of magnesium alloy and PLA in human body environment. The chemical reaction with the PBS solution and material dissolution were also simulated, utilising element deletion under the appropriate criteria. The PBS uptake rate and changes in mechanical properties were estimated by finite-element analysis, and the diffusion coefficients for each component were calibrated using experimentally acquired data, such as the PBS uptake rate of the composite specimen. A bone plate with screw holes for fastening fractured bones was simulated, and the degradation in material and mechanical properties was estimated to assess the serviceability, such as the load-carrying capacity, of the biodegradable composite as prostheses.

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引用次数: 0

Cross-dataset semantic segmentation for composite crack detection using unsupervised transfer learning

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

Composite Structures

Pub Date : 2025-03-16 DOI: 10.1016/j.compstruct.2025.119071

Pengchao Zhao , Wenyuan Xu , Dawei Qi , Bo Yuan

Deep learning-based segmentation has emerged as a powerful tool for pixel-level crack detection in composite and concrete structures. However, the width and orientation of fine cracks may be stealthily altered due to domain shifts, over-adaptation, and uncontrolled feature mapping across labeled and unlabeled datasets. This study proposes an unsupervised framework that integrates hybrid feature- and instance-based transfer learning techniques, investigating transfer directions and data reconstruction. Specifically, a Cycle Generative Adversarial Network is employed to align features without annotating target data. Additionally, a U-Net architecture enhanced with Squeeze-and-Excitation attention mechanisms—establishing weight relationships through channel-wise feature mapping—is utilized to improve crack feature extraction and segmentation accuracy. Experimental results demonstrate that bidirectional feature transfer from both source and target datasets to shared auxiliary feature spaces enforces the independent and identically distributed data structure, effectively mitigating over-adaptation and feature loss in hierarchical networks. The proposed framework exhibits strong scalability, accuracy, and adaptability across diverse datasets, making it a promising solution for structural health monitoring in composite and concrete materials.

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引用次数: 0

Parametric modeling on warp and weft tensile strength prediction and progressive damage evolution of 3D angle-interlock woven composites

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

Composite Structures

Pub Date : 2025-03-16 DOI: 10.1016/j.compstruct.2025.119072

Yi-xuan Sun , Tian-lei Yao , Xue Yang , Dian-sen Li , Lei Jiang , Hong-mei Zuo , Stepan V. Lomov , Frederik Desplentere

Considering the yarn extrusion and actual spatial structure of 3D angle-interlock woven composites(3DAWCs), a geometric equation is proposed and a parametric finite element model(FEM) is established to investigate the mesoscale tensile behavior. The results demonstrate the accurate prediction of tensile properties and progressive damage of 3DAWCs by the finite element model, with experimental data validating the effectiveness. Moreover, it is revealed that the tensile behavior exhibits a strong correlation with yarn density and loading direction. Under warp tensile load, strength and modulus exhibit a positive correlation with warp density while showing a negative correlation with weft density. Under weft tensile load, both strength and modulus increase as yarn density increases. Damage analysis reveals that warp tensile damage initially occurs at warp bends and weft edges, propagating from the interface between warp and matrix. With an increase in both warp and weft yarn densities, damage under weft tensile load distribution initiates from weft yarns before extending towards interfaces between warp/weft yarns and matrix.

考虑到三维角交错编织复合材料（3DAWCs）的纱线挤压和实际空间结构，提出了一个几何方程，并建立了一个参数化有限元模型（FEM）来研究中尺度拉伸行为。结果表明，有限元模型能准确预测 3DAWC 的拉伸性能和渐进损伤，实验数据也验证了其有效性。此外，研究还发现拉伸行为与纱线密度和加载方向密切相关。在经纱拉伸负载下，强度和模量与经纱密度呈正相关，而与纬纱密度呈负相关。在纬纱拉伸载荷下，强度和模量都随着纱线密度的增加而增加。损伤分析表明，经纱拉伸损伤最初发生在经纱弯曲处和纬纱边缘，从经纱和基体之间的界面传播。随着经纱和纬纱密度的增加，纬纱拉伸载荷分布下的损伤从纬纱开始，然后扩展到经纱/纬纱和基体之间的界面。

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引用次数: 0

Optimization design of structural parameters for honeycomb microwave absorbing repair structure based on surrogate models

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

Composite Structures

Pub Date : 2025-03-15 DOI: 10.1016/j.compstruct.2025.119074

Han Yan , Yubo Zhao , Shanyong Xuan , Hailong Yang , Chunhe Miao , Xuefeng Yao

The repair process parameters significantly affect the mechanical-electromagnetic properties and collaborative repair efficiency of the honeycomb microwave absorbing structure. In this study, a method is proposed to optimize the repair process by determining design variables, selecting appropriate input and output variables, and using experimental design methods. A finite element analysis numerical model is established with set boundary conditions and material parameters. Performance index data obtained from finite element calculations are used to build a surrogate model. Genetic algorithms are employed to optimize the design variables by analyzing the surrogate model and determining the mapping relationship between design variables and repair objectives. The optimal design combination is verified and evaluated through further finite element calculations to ensure the effectiveness of the optimized parameters and the performance of the repair process. This design method improves the accuracy of the repair process and reduces the time and cost involved in the repair process design. It provides a new idea and method for research and application in the field of honeycomb microwave absorbing structure repair. However, this study has not yet considered the process parameters of the repair process and the optimized results need experimental verification. Consequently, this study has certain limitations, which will be addressed in future research.

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引用次数: 0

Experimental investigation on bond behaviour of HB FRP strengthened concrete elements

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

Composite Structures

Pub Date : 2025-03-14 DOI: 10.1016/j.compstruct.2025.119069

Mehdi Aghabagloo, Laura Carreras, Cristina Barris, Marta Baena

Hybrid-bonded (HB) systems are employed to anchor carbon fibre reinforced polymer (CFRP) laminates to concrete structures and delay their premature debonding failure mode by generating compressive stresses on the joint. However, although previous research on these strengthening systems exists, the optimum parameters that minimize the potential for premature debonding failure and maximize the ultimate load still need to be investigated. In this work, the feasibility of decoupling the effect of decohesion and friction of an HB CFRP-to-concrete joint is assessed through experimental and numerical analysis. To this end, single shear tests are performed on concrete specimens strengthened with externally bonded reinforcement (EBR) and HB precured CFRP laminate. Besides, a numerical procedure, based on the finite difference method and a metaheuristic optimization algorithm, is used to obtain the bond-slip law that describes the constitutive behaviour of both systems. The separated contributions of the cohesion of the adhesive joint and the friction induced by the external compressive stresses perpendicular to the composite surface are analysed separately, and separated cohesive and friction bond-slip laws are obtained. The experimental behaviour of the full anchoring system is compared against that obtained by combination of the separated cohesive and friction contributions. The method represents progress in examining how different anchoring parameters, including the size (width and thickness) of the anchor plate and the torque applied to the bolts, influence the performance of the anchoring system in an efficient and systematic manner.

{"title":"Experimental investigation on bond behaviour of HB FRP strengthened concrete elements","authors":"Mehdi Aghabagloo, Laura Carreras, Cristina Barris, Marta Baena","doi":"10.1016/j.compstruct.2025.119069","DOIUrl":"10.1016/j.compstruct.2025.119069","url":null,"abstract":"<div><div>Hybrid-bonded (HB) systems are employed to anchor carbon fibre reinforced polymer (CFRP) laminates to concrete structures and delay their premature debonding failure mode by generating compressive stresses on the joint. However, although previous research on these strengthening systems exists, the optimum parameters that minimize the potential for premature debonding failure and maximize the ultimate load still need to be investigated. In this work, the feasibility of decoupling the effect of decohesion and friction of an HB CFRP-to-concrete joint is assessed through experimental and numerical analysis. To this end, single shear tests are performed on concrete specimens strengthened with externally bonded reinforcement (EBR) and HB precured CFRP laminate. Besides, a numerical procedure, based on the finite difference method and a metaheuristic optimization algorithm, is used to obtain the bond-slip law that describes the constitutive behaviour of both systems. The separated contributions of the cohesion of the adhesive joint and the friction induced by the external compressive stresses perpendicular to the composite surface are analysed separately, and separated cohesive and friction bond-slip laws are obtained. The experimental behaviour of the full anchoring system is compared against that obtained by combination of the separated cohesive and friction contributions. The method represents progress in examining how different anchoring parameters, including the size (width and thickness) of the anchor plate and the torque applied to the bolts, influence the performance of the anchoring system in an efficient and systematic manner.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"362 ","pages":"Article 119069"},"PeriodicalIF":6.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683478","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}

引用次数: 0