Composite Structures最新文献_第3页

Numerical investigation of composite metal foams using substructure techniques 利用子结构技术对复合金属泡沫进行数值研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-20 DOI: 10.1016/j.compstruct.2024.118731

Márió Kovács , Balázs Pere , Imre Norbert Orbulov

引用次数: 0

Experimental and numerical investigation on the size effect of interlaminar shear strength for thick composites 厚复合材料层间剪切强度尺寸效应的实验和数值研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-20 DOI: 10.1016/j.compstruct.2024.118710

Ziqing Hao , Xiaoyu Wang , Hongjun Ke , Gaojian Wei , George Kardomateas , Liu Liu

引用次数: 0

Experimental study on the electrical conductivity and strain sensitivity of fibre-reinforced thermoplastic for structural health monitoring 用于结构健康监测的纤维增强热塑性塑料的导电性和应变敏感性实验研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-19 DOI: 10.1016/j.compstruct.2024.118729

Ciampaglia, S. Roccia, R. Ciardiello

{"title":"Experimental study on the electrical conductivity and strain sensitivity of fibre-reinforced thermoplastic for structural health monitoring","authors":"Ciampaglia, S. Roccia, R. Ciardiello","doi":"10.1016/j.compstruct.2024.118729","DOIUrl":"10.1016/j.compstruct.2024.118729","url":null,"abstract":"<div><div>This experimental study explores the mechanical, electrical, and piezometric characteristics of conductive thermoplastic polymers reinforced with short carbon and glass fibres. The work investigates how the local anisotropy induced during the manufacturing injection process impacts the properties of the composite. Tensile tests showed that the material orientation respect to the injection flow direction significantly affects the mechanical properties due to the alignment of the fibres with the injection flow, as shown with the microscopy analysis. Contrarily, electrically conductive tests showed that the influence of the orientation on the conductive properties of the material is negligible. The study also unveils the difference in the surface and bulk conductivity with the increasing distance of the electrodes. Tensile tests with in-situ electrical measurements were conducted to assess strain sensitivity by correlating stress–strain curves with changes in material conductivity. The results demonstrate the predominant impact of local anisotropy on piezometric response. Finally, a model for the piezometric response of the material is proposed and applied for the structural health monitoring of a tensile specimen, revealing its ability to detect local damage before final failure. This application underscores the prognostic capabilities of this material and its potential significance in ensuring structural integrity.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118729"},"PeriodicalIF":6.3,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707186","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}

引用次数: 0

A DG-VLM framework for computational static aeroelastic analysis of composite wings 复合材料机翼静态气动弹性计算分析的 DG-VLM 框架

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-18 DOI: 10.1016/j.compstruct.2024.118697

Dario Campagna , Vincenzo Gulizzi , Ivano Benedetti

{"title":"A DG-VLM framework for computational static aeroelastic analysis of composite wings","authors":"Dario Campagna , Vincenzo Gulizzi , Ivano Benedetti","doi":"10.1016/j.compstruct.2024.118697","DOIUrl":"10.1016/j.compstruct.2024.118697","url":null,"abstract":"<div><div>A computational framework for static aeroelastic analysis of composite laminated plates is proposed, whose novelty is the conjoined use of a structural discontinuous Galerkin (DG) formulation and an aerodynamic vortex lattice method (VLM), suitably coupled for the monolithic solution of the aeroelastic problem. The structural method is built on variable-order generalized kinematics, which allows the seamless adoption of either beam or plate modeling strategies, with on-demand order of polynomial approximation over the transverse and in-plane dimensions of the structural elements. The underlying DG formulation also simplifies the coupling between the structural and aerodynamic grids, thus providing a versatile tool for the aeroelastic analysis of either low or high aspect-ratio composite wings. Several numerical tests have been performed to assess the convergence features of the proposed framework as well as its accuracy with respect to available computational and experimental benchmark data. The obtained results confirm its robustness and highlight its potential for aeroelastic assessments in early aircraft conceptual design.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118697"},"PeriodicalIF":6.3,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707177","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

Comparative study of toughness and energy evaluation of laminated bamboo composites and toughening mechanism 层压竹复合材料韧性和能量评估及增韧机理的比较研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118706

Yao Wu , Shengjie Liu , Zhi Li , Jinjun Xu , Weihang Xu

{"title":"Comparative study of toughness and energy evaluation of laminated bamboo composites and toughening mechanism","authors":"Yao Wu , Shengjie Liu , Zhi Li , Jinjun Xu , Weihang Xu","doi":"10.1016/j.compstruct.2024.118706","DOIUrl":"10.1016/j.compstruct.2024.118706","url":null,"abstract":"<div><div>As toughness becomes an important mechanical property of construction materials, scientific toughness assessment is vital to the development of new materials and helpful for material innovation. For laminated bamboo composites in which the failure modes are relatively uncertain, different methods were applied to evaluate the toughness of bamboo laminate. A comparative study of various toughness evaluation methods was conducted for laminated bamboo. The meaning and error of the toughness expressed by the energy release rate or <em>J</em>-integral determined by different methods were interpreted and analyzed. Based on the calculated toughness, the toughening mechanism of bidirectional laminated bamboo was explored. The results show that the ratio of transverse bamboo strip volume <em>V</em><sub>f</sub> vertical to the initial notch direction has a positive impact on the initial stiffness, maximum load, and energy release rate. Besides that, the layup or arrangement of bamboo strips would also affect the mechanical properties and fracture toughness of laminated bamboo, of which the effect is investigated by dividing the fracture parameters by <em>V</em><sub>f</sub>. It is concluded that the major mechanism for increasing the ductility and the toughness before the maximum load (expressed by <em>D</em><sub>2</sub>/<em>D</em><sub>1</sub> and <em>G</em><sub>Ic</sub><sup>un</sup>/<em>V</em><sub>f</sub> or <em>G</em><sub>Ic</sub><sup>0.8d</sup>/<em>V</em><sub>f</sub>) is the crack deflection caused by the hierarchical structure composed of vascular bundles (fiber) and parenchyma tissue (matrix) in a single layer of bamboo laminae. However, the ductility and the toughness after the maximum load (expressed by <em>D</em><sub>3</sub>/<em>D</em><sub>2</sub> and <em>G</em><sub>Ic</sub><sup>0.8d</sup>/<em>G</em><sub>Ic</sub><sup>un</sup>) are mainly enhanced by the alternatively arranged bamboo laminae of different fiber directions.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118706"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701193","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}

引用次数: 0

Shape recovery effect and energy absorption of reusable honeycomb structures 可重复使用蜂窝结构的形状恢复效果和能量吸收

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118708

Yangzuo Liu , Changfang Zhao , Cheng Xu , Jie Ren

{"title":"Shape recovery effect and energy absorption of reusable honeycomb structures","authors":"Yangzuo Liu , Changfang Zhao , Cheng Xu , Jie Ren","doi":"10.1016/j.compstruct.2024.118708","DOIUrl":"10.1016/j.compstruct.2024.118708","url":null,"abstract":"<div><div>When using auxetic honeycomb structures to create repeatable energy-absorbing components, a key challenge is selecting the appropriate unit configuration for effective functional integration. In this work, four typical honeycomb structures were prepared, and the mechanical behaviors, shape recovery effects, and energy absorption properties of three types of auxetic honeycomb structures re-entrant honeycomb (RH), arrow honeycomb (AH), and star honeycomb (SH) were compared with those of hexagonal honeycomb (HH) through quasi-static loading–unloading tests. The findings indicate that the 3D printed polyurethane (TPU) honeycomb structures demonstrate robust shape recovery, stable energy absorption, notable stress softening characteristics. The recovery behaviors can be characterized by three distinct phases, namely hyperelastic, transitional, and viscoelastic. The unit configuration significantly influences the shape recovery capability, with apparent elastic modulus and stability of the energy absorption efficiency determining the overall shape recovery capability. The loading method also affects the energy absorption and dissipation patterns in different honeycomb structures. In terms of specific energy absorption (SEA), AH has the highest rating, with RH and SH at 86 % and 50 % of the SEA of AH respectively. The number of reusable cycles is primarily dictated by the specific configuration of the unit type. In scenarios involving reusability, the energy absorption capacity of the TPU honeycomb can only reach 70 % of its original energy absorption capacity. This study may inform the application of auxetic materials in reusable energy absorbers.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118708"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701192","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}

引用次数: 0

Low-velocity impact damage characteristics of flax/glass epoxy hybrid laminates on the influence of different temperatures: Experimental and numerical analysis 亚麻/玻璃环氧混合层压板在不同温度影响下的低速冲击损伤特性：实验和数值分析

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118704

Muneer Ahmed Musthaq Ahamed , Hom Nath Dhakal , Zhongyi Zhang , Antigoni Barouni , John Regan Pillai , Saleh Elkelani Babaa

{"title":"Low-velocity impact damage characteristics of flax/glass epoxy hybrid laminates on the influence of different temperatures: Experimental and numerical analysis","authors":"Muneer Ahmed Musthaq Ahamed , Hom Nath Dhakal , Zhongyi Zhang , Antigoni Barouni , John Regan Pillai , Saleh Elkelani Babaa","doi":"10.1016/j.compstruct.2024.118704","DOIUrl":"10.1016/j.compstruct.2024.118704","url":null,"abstract":"<div><div>This study investigated the effects of different temperatures on the low-velocity impact damage behaviour of flax fibre-reinforced epoxy composites and their glass/flax hybrids. Composites reinforced with flax, glass, and hybrid flax/glass onto epoxy matrix Subjected to low-velocity drop weight impact tests at 5 J of incident impact energy at sub-zero temperatures (−10 °C and −20 °C) and at room temperature (RT) are presented. Under the different temperatures, the experimental findings showed a beneficial hybrid effect where the temperature played a significant role. At RT, the Lam-GFGFGFG exhibit improved impact resistance, with enhanced energy absorption capabilities compared to glass-only laminates (Lam-G). Besides, Lam-GFFFFG laminates exhibit a significant difference in the force–displacement curves at − 20 °C, with a maximum load of 801.95 N in contrast to RT and − 10 °C resulting in a gradual increase in force with increasing displacement. This indicates that Lam-GFFFFG laminates can resist the impact and maintain structural integrity at sub-zero temperatures. The alternation of glass and flax layers in the hybrid structure contributes to the synergistic effects, resulting in improved damage resistance and tolerance. Also, the highest impact tolerance in a laminate is achieved through the hybridisation of flax fibre-reinforced composites with glass-reinforced layers on the outer surfaces (Lam-GFFFFG) at − 10 °C. Subsequently, experimental results were compared with finite element analysis (FEA) results, derived from a model built using a VUMAT subroutine integrated with ABAQUS/Explicit for a more accurate representation of the damage characterisation of the composite laminates under low-velocity impact.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118704"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707183","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

Nonlinear large strain mechanics and failure of 45° woven CFRP laminates characterized by Full-Field measurements 全场测量法表征的 45° 编织 CFRP 层压板的非线性大应变力学和破坏特性

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118715

Behrad Koohbor , Nicholas B. Mennie , Addis Kidane

{"title":"Nonlinear large strain mechanics and failure of 45° woven CFRP laminates characterized by Full-Field measurements","authors":"Behrad Koohbor , Nicholas B. Mennie , Addis Kidane","doi":"10.1016/j.compstruct.2024.118715","DOIUrl":"10.1016/j.compstruct.2024.118715","url":null,"abstract":"<div><div>The nonlinear mechanical response of 45° woven composites is studied using full-field strain measurements. First, carbon fabric samples without an epoxy matrix are prepared and tested to evaluate the deformation response of the fiber tows in the absence of internal resistance imposed by the epoxy matrix. Next, the effect of the epoxy matrix is examined by fabricating and testing 45° single-ply carbon fiber reinforced composite laminas. Homogeneous strain fields with minimal resistance against external loads are observed in fabric samples without epoxy. The in-plane rotation of fiber tows in the carbon fabric samples varies linearly with the applied global strain. On the other hand, the development of scissoring action in single-ply composite laminas is shown to cause severe shearing of the epoxy entrapped between the orthogonal fiber tows, leading to the outward protrusion of epoxy from the surface of the lamina. The scissoring effect is correlated with different stages of deformation in a highly nonlinear stress–strain response. Finally, similar tests performed on three-ply laminates reveal that the abovementioned matrix protrusion leads to accelerated delamination in 45° laminates at global strains lower than those in single-ply laminas. The underlying mechanisms for scissoring-induced matrix protrusion are discussed using a simple analytical model.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118715"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701134","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

Inertial and elastic properties of general composite beams 一般复合梁的惯性和弹性特性

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118690

Wenbin Yu

{"title":"Inertial and elastic properties of general composite beams","authors":"Wenbin Yu","doi":"10.1016/j.compstruct.2024.118690","DOIUrl":"10.1016/j.compstruct.2024.118690","url":null,"abstract":"<div><div>Slender composite structures can be modeled using engineering beam models with properties computed using a cross-sectional analysis program, such as VABS. These properties are given in terms of the mass matrix, stiffness matrix, and compliance matrix in a general coordinate system. The invariance of strain energy and kinetic energy is employed to rigorously transform sectional properties into different coordinate systems with parallel shifts and rotations. Additionally, the computation of commonly used inertial properties (mass center, principal inertial axes, and mass moments of inertia) from the mass matrix, and commonly used elastic properties (extension stiffness, bending stiffness, torsion stiffness, tension center, shear center, principal bending axes, principal shear axes, etc.) from the compliance matrix, is elucidated. The elastic properties are given for both the Timoshenko model and the Euler–Bernoulli model. The definitions for shear center and twist center are clarified and consistently generalized for composite beams. Isotropic homogeneous beams are used to illustrate how to relate commonly used engineering beam properties with the compliance matrix and the stiffness matrix for composite beams. Finally, engineering beam properties necessary for general-purpose aeromechanical analysis programs such as CAMRAD II are derived from the properties computed by VABS.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118690"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701191","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}

引用次数: 0

Stress-driven nonlocal integral model with discontinuities for transverse vibration of multi-cracked non-uniform Timoshenko beams with general boundary conditions 具有一般边界条件的多裂缝非均匀季莫申科梁横向振动的应力驱动非局部不连续积分模型

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-17 DOI: 10.1016/j.compstruct.2024.118712

Pei Zhang , Peter Schiavone , Hai Qing , Qi Li

{"title":"Stress-driven nonlocal integral model with discontinuities for transverse vibration of multi-cracked non-uniform Timoshenko beams with general boundary conditions","authors":"Pei Zhang , Peter Schiavone , Hai Qing , Qi Li","doi":"10.1016/j.compstruct.2024.118712","DOIUrl":"10.1016/j.compstruct.2024.118712","url":null,"abstract":"<div><div>We present a formulation for the size-affected vibration study of multi-cracked non-uniform Timoshenko beams based on the well-posed stress-driven nonlocal elastic theory with discontinuities. The beam ends are assumed to be constrained by elastic springs with translational and rotational stiffness to simulate general boundary conditions. The presence of cracks divides the beam into segments connected by translational and rotational springs, and compatibility conditions are established to address the geometric discontinuities introduced by these cracks. The stress-driven constitutive equations are integrated into an equivalent differential form, equipped with a set of constitutive boundary conditions at the two ends of the entire structure and multi-sets of constitutive continuity conditions at the junctions of the sub-structures. To solve the equations of motion, the constraint conditions and the integrals involved, we employ the differential quadrature method (DQM) alongside an interpolation quadrature formula, which allows us to efficiently compute the frequencies of the cracked beams across various boundary types. After validating our approach against results in the existing literature, we present numerical studies that examine the effects of the nonlocal parameter, the slope of the beam’s thickness variation, crack location, severity, number, and the stiffness of the springs on the vibrational behavior of the beams.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118712"},"PeriodicalIF":6.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707176","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}

引用次数: 0