Composite Structures最新文献_第5页

Experimental investigation of the behavior of UHPCFST under repeated eccentric compression 对 UHPCFST 在反复偏心压缩下的行为进行实验研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-21 DOI: 10.1016/j.compstruct.2024.118661

Chunlei Yu , Min Yu , Lihua Xu , Sumei Liu , Zewen Sun , Jianqiao Ye

{"title":"Experimental investigation of the behavior of UHPCFST under repeated eccentric compression","authors":"Chunlei Yu , Min Yu , Lihua Xu , Sumei Liu , Zewen Sun , Jianqiao Ye","doi":"10.1016/j.compstruct.2024.118661","DOIUrl":"10.1016/j.compstruct.2024.118661","url":null,"abstract":"<div><div>This paper investigates the mechanical behavior of ultra-high-performance concrete-filled steel tubes (UHPCFST) under repeated eccentric compression. A total of 30 UHPCFST specimens are designed, fabricated, and tested. The design variables include steel tube thickness, UHPC type, loading eccentricity and load pattern. Failure modes, force-axial shortening curves, section strain distributions, lateral deflection distributions, bearing capacity and stiffness are studied. Three failure modes, <em>i.e</em>., steel tube bulge, compressive crush and tensile crack of the UHPC infill are observed. Specimens with larger loading eccentricity and thinner steel tube are more likely to exhibit all the three modes. Subjected to eccentric loading, the compressive strength and stiffness of the UHPCFST increase significantly with the increase of steel tube thickness and UHPC strength. In the case of repeated loading, stiffness degradation is observed. Existing formulas for the N-M curve and the eccentric compressive capacity are evaluated against the test results. A formula for eccentric compressive stiffness is derived based on the parabolic function assumption. Additionally, an empirical model is introduced to describe the force-axial shortening relationship of the UHPCFST under repeated eccentric compression, which may be applied in practical design and analysis.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118661"},"PeriodicalIF":6.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527407","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

Machine learning for nano-level defect detection in aligned random carbon nanotubes-reinforced electrically conductive nanocomposite 机器学习用于对齐随机纳米碳管增强导电纳米复合材料中的纳米级缺陷检测

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-21 DOI: 10.1016/j.compstruct.2024.118651

Iskander S. Akmanov, Stepan V. Lomov, Mikhail Y. Spasennykh, Sergey G. Abaimov

{"title":"Machine learning for nano-level defect detection in aligned random carbon nanotubes-reinforced electrically conductive nanocomposite","authors":"Iskander S. Akmanov, Stepan V. Lomov, Mikhail Y. Spasennykh, Sergey G. Abaimov","doi":"10.1016/j.compstruct.2024.118651","DOIUrl":"10.1016/j.compstruct.2024.118651","url":null,"abstract":"<div><div>Machine learning allows fast nano-scale defect detection in polymer-impregnated aligned carbon nanotube (CNT) nanocomposites. Digital twins were populated by TEM-validated geometry; considered defects were flat cracks and close-to-spherical voids. Finite-element analysis of piezoresistive response was conducted by embedment of CNT network into matrix. Identification of a defect by change in CNT network piezoresistivity was challenged by: (1) randomness of CNTs’ shapes and placement, ML training happened on random realisations; (2) high strength of CNTs leading to the preservation of conductive paths along CNTs and changes only in conductivities of tunnelling contacts. “Artificial approximation“ was introduced to economise computer time multi-fold: ML was trained on cases with artificially degraded tunnelling conductivities within the defect. Three ML models: XGBoost, fully connected, and convolution neural networks were employed. All models managed the task for near-spherical voids, but performed poorly for flat cracks, due to the limited number of tunnelling contacts in crack volume. When trained on the mixed set of voids and cracks, both neural networks demonstrated the ability to learn the difference and detected even cracks, while XGBoost was not up to the challenge. By metrics, the convolutional neural network demonstrated the highest accuracy of predictions.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118651"},"PeriodicalIF":6.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527469","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

The application of novel shear deformation theory and nonlocal elasticity theory to study the mechanical response of composite nanoplates 应用新型剪切变形理论和非局部弹性理论研究复合纳米板的力学响应

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-20 DOI: 10.1016/j.compstruct.2024.118646

Phan Quang Phuc , Pham Van Dong , Nguyen Trong Hai , Ashraf M. Zenkour , Luu Gia Thien

{"title":"The application of novel shear deformation theory and nonlocal elasticity theory to study the mechanical response of composite nanoplates","authors":"Phan Quang Phuc , Pham Van Dong , Nguyen Trong Hai , Ashraf M. Zenkour , Luu Gia Thien","doi":"10.1016/j.compstruct.2024.118646","DOIUrl":"10.1016/j.compstruct.2024.118646","url":null,"abstract":"<div><div>The use of composite structures, which have many layers of materials, has become more prevalent in the field of engineering. One of the advantages of this approach is its ability to use the inherent strengths of the constituent materials, resulting in a substantial increase in their load-bearing capability. Hence, this research represents the pioneering investigation into the static bending and free vibration characteristics of composite nanoplates including several layers of materials, whereby the material layers are interconnected via intricate profiles characterized by square wave and sine waveforms. The purpose of this endeavor is to fully capitalize on the benefits of attending courses in order to enhance practical working efficiency. This study also incorporates the use of two innovative third-order shear deformation theories. Simultaneously, considering the negligible size impact facilitated by the nonlocal theory, the mathematical formulations and equilibrium equations are derived using the Hamilton principle. The issue has been addressed using a four-node element with six degrees of freedom per node. One novel aspect of this study is its consideration of the impact of initial shape imperfections in various manifestations. Additionally, the elastic foundation incorporates characteristics that exhibit spatial variation. This statement provides a somewhat more accurate depiction of the behavior shown by actual structures. The numerical findings have been meticulously computed and thoroughly examined. Notably, it is possible to determine the optimal number of wavelengths in the profile to enhance the load-bearing capability of the structure. The findings derived from this study have significant value in informing the design of operational frameworks in practical settings.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118646"},"PeriodicalIF":6.3,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527467","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

Three-dimensional mesoscopic investigation on the dynamic compressive behavior of coral sand concrete with reinforced granite coarse aggregate (GCA) 对含强化花岗岩粗骨料（GCA）的珊瑚砂混凝土动态抗压行为的三维中观研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-19 DOI: 10.1016/j.compstruct.2024.118650

Ruiqi Guo , Jie Dong , Linjian Ma , Zhilin Long , Fu Xu , Changjun Yin

{"title":"Three-dimensional mesoscopic investigation on the dynamic compressive behavior of coral sand concrete with reinforced granite coarse aggregate (GCA)","authors":"Ruiqi Guo , Jie Dong , Linjian Ma , Zhilin Long , Fu Xu , Changjun Yin","doi":"10.1016/j.compstruct.2024.118650","DOIUrl":"10.1016/j.compstruct.2024.118650","url":null,"abstract":"<div><div>In the construction of island and reef engineering, coral concrete shows a good application prospect due to its abundant raw materials. However, the porous and fragile mechanical characteristics of coral reefs limit their use as coarse aggregate in the preparation of coral concrete materials. This study utilized hard and dense granite as the coarse aggregate and regarded coral sand concrete as a two-phase composite material consisting of spherical granite coarse aggregate (GCA) and coral mortar. It investigated the enhancement effect of granite on coral concrete from a microscopic perspective. Five 3D mesoscopic models with different GCA contents and randomly distributed aggregates were established to reveal the variation patterns and failure mechanisms of coral sand concrete under impact loading with GCA. The findings demonstrate that the K&C model can effectively simulate the dynamic compression behavior of coral mortar and granite materials. Under the action of a half-sine incident wave, the dynamic compressive strength of the samples increases with the increase in GCA, demonstrating that the addition of GCA can effectively enhance the impact resistance of coral sand concrete. As the content of GCA increases, the sensitivity of the samples to the loading wave amplitude also increases accordingly.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118650"},"PeriodicalIF":6.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527466","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

An efficient moving-mesh strategy for predicting crack propagation in unidirectional composites: Application to materials reinforced with aligned CNTs 预测单向复合材料裂纹扩展的高效移动网格策略：应用于使用排列有序的碳纳米管增强的材料

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-19 DOI: 10.1016/j.compstruct.2024.118652

Domenico Ammendolea , Francesco Fabbrocino , Lorenzo Leonetti , Paolo Lonetti , Arturo Pascuzzo

{"title":"An efficient moving-mesh strategy for predicting crack propagation in unidirectional composites: Application to materials reinforced with aligned CNTs","authors":"Domenico Ammendolea , Francesco Fabbrocino , Lorenzo Leonetti , Paolo Lonetti , Arturo Pascuzzo","doi":"10.1016/j.compstruct.2024.118652","DOIUrl":"10.1016/j.compstruct.2024.118652","url":null,"abstract":"<div><div>This paper presents an efficient numerical approach for reproducing the process of crack propagation inside unidirectional composites subjected to general loading conditions, with special reference to epoxy materials enhanced with embedded aligned CNTs. This approach involves a traditional FE framework improved by the Moving Mesh (MM) technique based on the Arbitrary Lagrangian-Eulerian (ALE) formulation and the Interaction Integral Method (<em>M</em>−integral). The MM serves as a powerful numerical tool to simulate the discrete crack advance with minimal remeshing, thus reducing the computational complexities. Instead, the <em>M</em>−Integral method, formulated for generally anisotropic materials, has been employed to extract the mixed-mode Stress Intensity Factors (SIFs), which are necessary to define the crack onset condition and propagation direction on the basis of the modified Maximum Hoop Stress Criterion. The proposed strategy includes the extended rule of mixtures to evaluate the homogenized elastic properties of nano-reinforced composites. The validity of the proposed methodology has been assessed through comparisons with experimental data and numerical results available in the literature.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118652"},"PeriodicalIF":6.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527468","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

A homogenized constitutive model for 2D woven composites under finite deformation: Considering fiber reorientation 有限变形条件下二维编织复合材料的均质结构模型：考虑纤维重新定向

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-19 DOI: 10.1016/j.compstruct.2024.118649

Dake Wu , Zhangjie Yu , Xinfa Xiong , Ang Peng , Jian Deng , Deng’an Cai , Guangming Zhou , Xinwei Wang

{"title":"A homogenized constitutive model for 2D woven composites under finite deformation: Considering fiber reorientation","authors":"Dake Wu , Zhangjie Yu , Xinfa Xiong , Ang Peng , Jian Deng , Deng’an Cai , Guangming Zhou , Xinwei Wang","doi":"10.1016/j.compstruct.2024.118649","DOIUrl":"10.1016/j.compstruct.2024.118649","url":null,"abstract":"<div><div>Two-dimensional (2D) woven composites exhibit excellent mechanical properties along the fiber directions. The mechanical behaviors demonstrate nonlinearity in specific applications. Although plasticity methods can be applied to predict complex behaviors, however, fiber reorientation has been observed during finite deformation, indicating that the fiber directions are no longer along orthotropic material axes when the angle between fibers changes. The angular bisectors of two fiber directions can serve as the orthotropic material axes due to the rotational symmetries even in finite deformation scenarios. This study reports a homogenized nonlinear constitutive model based on the rotational symmetry axes, incorporating plasticity and fiber reorientation phenomena. The plasticity model contains a two-parameter flow potential and power function. Plastic deformations are computed using an explicit method. Fiber reorientation angles are computed both theoretically and numerically. The relationship between mechanical properties and fiber reorientation angles is studied using finite element method (FEM). Due to introduce of a novel approach to determining the strain and stress of 2D woven composites undergoing finite deformation, the proposed model should have potential in engineering predictions.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118649"},"PeriodicalIF":6.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527416","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

Effect of Three-Dimensional auxetic honeycomb core on behavior of sound transmission loss in shallow sandwich cylindrical shell 三维辅助蜂窝芯对浅层夹层圆柱壳传声损耗行为的影响

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-16 DOI: 10.1016/j.compstruct.2024.118624

Mojtaba Sayad Ghanbari Nezhad , Mehrdad Motavasselolhagh , Roohollah Talebitooti , Fengxian XIN

{"title":"Effect of Three-Dimensional auxetic honeycomb core on behavior of sound transmission loss in shallow sandwich cylindrical shell","authors":"Mojtaba Sayad Ghanbari Nezhad , Mehrdad Motavasselolhagh , Roohollah Talebitooti , Fengxian XIN","doi":"10.1016/j.compstruct.2024.118624","DOIUrl":"10.1016/j.compstruct.2024.118624","url":null,"abstract":"<div><div>The primary objective of this research is to examine the sound transmission loss (STL) in a shallow sandwich cylindrical shell featuring a 3D auxetic honeycomb core. Initially, the 3D elasticity theory was employed by applying the state vector method and extracting both local and global transfer matrices to calculate STL relations for the cylindrical shell, including the auxetic honeycomb core. Subsequently, boundary conditions were applied to calculate the unknowns, eventually leading to a relationship for calculating STL within the structure. The derived equations were numerically solved using MATLAB software. The validity of the results obtained using this method was examined by comparing them with the findings of other researchers. Moreover, a comparison was conducted involving a large ratio of the curvature radius to thickness, considering both the auxetic honeycomb core and aluminum with equal mass. The results demonstrate a significant increase in STL when utilizing this auxetic honeycomb core compared to a material with the same mass. Specifically, at a frequency of 2 Hz, a significant enhancement of about 29.44 % in STL is observed when increasing the core thickness from 10.39 mm to 20.39 mm. Furthermore, STL results have been obtained for various thicknesses, radius of curvature, and incident angles.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118624"},"PeriodicalIF":6.3,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527413","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 novel cellular structure with center-symmetric cell walls for morphing applications 用于变形应用的具有中心对称细胞壁的新型细胞结构

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-16 DOI: 10.1016/j.compstruct.2024.118644

Dezhi Wu, Guang Yang, Jianguo Tao, Yue Wang, Hong Xiao, Hongwei Guo

引用次数: 0

Damage evolution and failure mechanism of 2.5D woven composite tubes under quasi-static lateral compression 准静态横向压缩条件下 2.5D 编织复合管的损伤演变和破坏机理

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-11 DOI: 10.1016/j.compstruct.2024.118635

Yajuan Wang, Zunqing Wang, Xiaoxu Wang, Diantang Zhang

{"title":"Damage evolution and failure mechanism of 2.5D woven composite tubes under quasi-static lateral compression","authors":"Yajuan Wang, Zunqing Wang, Xiaoxu Wang, Diantang Zhang","doi":"10.1016/j.compstruct.2024.118635","DOIUrl":"10.1016/j.compstruct.2024.118635","url":null,"abstract":"<div><div>2.5D woven composites are ideal candidate materials for deep-sea pressure tubes owing to their excellent out-of-plane properties. This paper presents the damage evolution and failure mechanism of 2.5D woven composite tubes under quasi-static lateral compression. To conduct this study, 2.5D woven composite tubes with different thickness-to-diameter ratios, 0.04, 0.07 and 0.10, were designed and prepared. The quasi-static lateral compression tests were carried out in order to evaluate the progressive damage analysis, combining high speed photographic image with acoustic emission technologies. The results show that the increase of the ratio of thickness-to-diameter, the deformation and shear failure of the sample can be inhibited obviously. Due to the enhanced interlayer interaction, the lateral stiffness of the sample is obviously improved, so the lateral bearing stability of the sample is improved. When the peak load of samples with the thickness-to-diameter ratio of 0.1 reached 11.51 kN, it exceeded that of samples with thickness-to-diameter ratios of 0.04 and 0.07 by 450% and 82%, respectively. Furthermore, the failure mechanisms of samples with the thickness-to-diameter ratio of 0.1 were controlled by delamination fracture, whereas that of 0.04 and 0.07 were mainly influenced by shear failure and delamination failure, respectively.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"351 ","pages":"Article 118635"},"PeriodicalIF":6.3,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433165","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

Vibration suppression characteristics of a thin sandwich panel with misaligned stacking spider-web-like phononic crystal cores 具有错位堆叠蛛网状声波晶体芯的薄夹芯板的振动抑制特性

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-10-11 DOI: 10.1016/j.compstruct.2024.118642

Fulong Zhao, Tongtong Huo, Zhijing Wu, Fengming Li

{"title":"Vibration suppression characteristics of a thin sandwich panel with misaligned stacking spider-web-like phononic crystal cores","authors":"Fulong Zhao, Tongtong Huo, Zhijing Wu, Fengming Li","doi":"10.1016/j.compstruct.2024.118642","DOIUrl":"10.1016/j.compstruct.2024.118642","url":null,"abstract":"<div><div>A novel spider-web-like multi-hole variable cross-section phononic crystal (VCSPC) is proposed in this study, along with a misaligned stacking approach for constructing thin sandwich panels to achieve lightweight and compact structures for low-frequency vibration suppression. The band-gap (BG) characteristics and vibration modes are analyzed using the finite element method (FEM). To validate the effectiveness of the misaligned stacking approach, the finite element simulation and experimental verification of the frequency response function (FRF) are conducted. The results demonstrate that the spider-web-like configuration, with distributed masses and periodically varying cross-sections, can reduce the opening frequencies of BGs. When compared to the conventional linearly arranged panel, the misaligned stacking structure exhibits equivalent vibration BGs and attenuation characteristics. It is important to note that the misaligned stacking design significantly reduces the size in the direction of vibration attenuation. This type of thin sandwich panel is well-suited for engineering environments with size limitations on vibration reduction structures. The proposed strategy facilitates the use of large-scale phononic crystals for low-frequency vibration control, thereby promoting the application of phononic crystals in engineering through a more compact structural design.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118642"},"PeriodicalIF":6.3,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527411","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