Composite Structures最新文献_第2页

A decoupled bend–tension–shear coarse grained model for staggered structures

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-25 DOI: 10.1016/j.compstruct.2024.118688

Yanan Zhang , Haiyi Liang

{"title":"A decoupled bend–tension–shear coarse grained model for staggered structures","authors":"Yanan Zhang , Haiyi Liang","doi":"10.1016/j.compstruct.2024.118688","DOIUrl":"10.1016/j.compstruct.2024.118688","url":null,"abstract":"<div><div>Biomaterials like teeth, bone, and nacre have developed curved geometry and staggered structures, with remarkable mechanical properties attracting plenty of theoretical and numerical works. For these brick–mortar materials, the coupling between bending, stretching, and shearing deformations is inevitable under transverse loading and remains to be explored. In this work, we propose a decoupled bend–tension–shear (<em>d</em>-BTS) coarse grained model for staggered structures, using node displacements only as the basic variables. The bending and stretching deformations of bricks are modeled by two independent sets of springs tied together by Lagrange multipliers, leading to improved computation efficiency. This model may reduce to a minimal model with the least number of spring nodes characterizing the coupling between bending, stretching, and shearing deformations, analogous to the widely accepted tension–shear-chain (TSC) minimal model developed for shear-lag deformation in staggered structures. <em>d</em>-BTS model is validated with several examples confirmed by finite element calculations. The model is used to simulate the three-point bending tests, revealing the important contribution of bending to shear strain and the nontrivial roles of break-matrix on bending rigidity. <em>d</em>-BTS model presents a simple and efficient tool to investigate the toughness and strength of staggered structures in large scales when subjected to bending and stretching.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"354 ","pages":"Article 118688"},"PeriodicalIF":6.3,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758755","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

Stiffness degradation of woven roving GFRP due to shear and compression fatigue damage 剪切和压缩疲劳损伤导致编织粗纱 GFRP 的刚度退化

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-24 DOI: 10.1016/j.compstruct.2024.118725

Akihiko Sato , Yasuo Kitane , Kunitomo Sugiura , Yoshinao Goi

{"title":"Stiffness degradation of woven roving GFRP due to shear and compression fatigue damage","authors":"Akihiko Sato , Yasuo Kitane , Kunitomo Sugiura , Yoshinao Goi","doi":"10.1016/j.compstruct.2024.118725","DOIUrl":"10.1016/j.compstruct.2024.118725","url":null,"abstract":"<div><div>Woven roving GFRP is widely used in the structural members of GFRP bridges which are subject to compression or shear stress. However, it is not revealed well about fatigue strength and stiffness degradation under these loading conditions. This study aims to clarify the fatigue strength and residual stiffness of woven roving GFRP under in-plane shear and compression cyclic loading. The specimens were tested at 45 degrees to the fiber direction in the cyclic tensile test, while the compression fatigue test was adjusted to prevent buckling. It is revealed that the in-plane fatigue limit corresponds to the principal strain of about <span><math><mrow><mn>3700</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>6</mn></mrow></msup></mrow></math></span>. The compression fatigue limit was 40% of the static compression strength. In-plane shear fatigue damage is predominantly due to matrix cracks, and the stiffness degradation appears in Region I, II, and III. The shear stiffness decreased by 20% before the fatigue failure. On the other hand, in the compression fatigue test, matrix cracks hardly occur, and delamination is dominant. The stiffness degradation of Region I is very limited in compression, and stiffness decreased about 10% before the fatigue failure. Moreover, theoretical models are proposed to express the residual stiffness, and they agree well with the experimental value.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118725"},"PeriodicalIF":6.3,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722729","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

Sensor placement optimization for composite aircraft structures: A multi-objective Kriging-based approach 复合材料飞机结构的传感器布置优化：基于克里金法的多目标方法

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-23 DOI: 10.1016/j.compstruct.2024.118723

Felipe Martarella de Souza Mello, Guilherme Ferreira Gomes

引用次数: 0

Ultrasonic reconsolidation of separated CF-PEEK composite layers at 20 kHz — An experimental study on parameter optimization and Ex-situ characterization 20 kHz 下分离 CF-PEEK 复合材料层的超声波再固结--关于参数优化和原位表征的实验研究

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-22 DOI: 10.1016/j.compstruct.2024.118722

Balaji Ragupathi , Lennard Rotzinger , Mario Prescher , Michael Rienks , Lutz Kirste , Frank Balle

{"title":"Ultrasonic reconsolidation of separated CF-PEEK composite layers at 20 kHz — An experimental study on parameter optimization and Ex-situ characterization","authors":"Balaji Ragupathi , Lennard Rotzinger , Mario Prescher , Michael Rienks , Lutz Kirste , Frank Balle","doi":"10.1016/j.compstruct.2024.118722","DOIUrl":"10.1016/j.compstruct.2024.118722","url":null,"abstract":"<div><div>Ultrasonic-assisted joining can replace the current repair strategies, such as adhesive bonding, to join the repair patches onto the damaged aerospace composite structures due to their energy and time efficiency. This work reports on the process optimization of repairing separated carbon fiber reinforced (CF)/ poly-ether-ether-ketone (PEEK) layers through ultrasonic reconsolidation at 20 kHz and its influence on the mechanical performance. The results showed that weld force and weld time dominate the temperature evolution, which was used to set the ultrasonic process window. Repairing CF-PEEK layers to different laminate architecture exhibited a 15% deviation from the reference repair. Compared with quantitative results, the ex-situ investigation showed that excessive holding force caused fiber–matrix debonding, leading to a cohesive failure inside the composite laminate. An optimal holding force, approximately 25% of the used weld force, is recommended to alleviate these damages.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118722"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142706304","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

Preparation and application of multilayered flexible phase change material with high thermal conductivity and high enthalpy 高热导率和高热焓多层柔性相变材料的制备与应用

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-22 DOI: 10.1016/j.compstruct.2024.118718

Jianjuan Yuan , Yuyao Yan , Xiangfei Kong , Chendong Wang , Man Fan

{"title":"Preparation and application of multilayered flexible phase change material with high thermal conductivity and high enthalpy","authors":"Jianjuan Yuan , Yuyao Yan , Xiangfei Kong , Chendong Wang , Man Fan","doi":"10.1016/j.compstruct.2024.118718","DOIUrl":"10.1016/j.compstruct.2024.118718","url":null,"abstract":"<div><div>Phase change material (PCM) uses latent heat to store heat and are widely used in thermal management of electronic components. However, endowing PCM with high thermal conductivity and high enthalpy remains a challenge. This study designs a multilayered structure, paraffin (PA)/styrene-b-(ethylene-co-butylene)-b-styrene triblock copolymer (SEBS) (PA/SEBS) and PA/SEBS/expanded graphite (EG) (PA/SEBS/EG) are prepared by melt blending and crosslinked together in sequence, named 0EG@6EG. The results show that the enthalpy value of 0EG@6EG is as high as 167.46 kJ·kg<sup>−1</sup>, and the thermal conductivity has been improved compared to traditional uniform structure. 0EG@6EG has a certain degree of self-healing ability, and the contact surface between layers could withstand a tensile strength of 0.23 MPa. The passive experiment indicates that the temperature rising rate of 0EG@6EG is 4.08 % higher than that of PA/SEBS/3EG. The active experiment shows that the highest outlet temperature difference between 0EG@6EG and PA/SEBS/3EG is 1.52 °C, and the heat released is 26.73 % higher than that of PA/SEBS/3EG. The optimal thickness ratio between PA/SEBS/0EG to PA/SEBS/6EG in 0EG@6EG is 1.2:0.8, and when the active system contacts with the layer of PA/SEBS/6EG, it is conducive to enhance heat transfer. This work provides a reference for increasing the thermal conductivity of PCM without decreasing enthalpy value.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118718"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707175","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

Ballistic response of an airbag with parallel ribs under spherical projectile impact 带有平行肋条的安全气囊在球形弹丸冲击下的弹道响应

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-22 DOI: 10.1016/j.compstruct.2024.118734

Jiaqi Bai , Shaobo Qi , Yachen Xie , Mengqi Yuan , Menglu Li

{"title":"Ballistic response of an airbag with parallel ribs under spherical projectile impact","authors":"Jiaqi Bai , Shaobo Qi , Yachen Xie , Mengqi Yuan , Menglu Li","doi":"10.1016/j.compstruct.2024.118734","DOIUrl":"10.1016/j.compstruct.2024.118734","url":null,"abstract":"<div><div>The airbag-type inflatable structure with ribs was developed, composited from thermoplastic polyurethane (TPU) membranes. Ballistic impact tests were conducted on pre-inflated airbags to assess the airbag’s dynamic response. A set of Split Hopkinson Tensile Bar (SHTB) experiments were conducted on TPU membranes at strain rates ranging from 3000 to 12,000 s<sup>−1</sup> to derive a strain-rate dependent constitutive model for TPU under ballistic impact conditions. Based on the fluid cavity inflation method, a finite element model was employed to analyze the structural response of the airbag. Based on the principle of energy conservation, an innovative theoretical model for the impact of airbags considering internal pressure has been established. The results indicate a strong agreement between the numerical, theoretical, and experimental results concerning the impact process and ballistic limit. It was observed that as the internal pressure rises, the ballistic limit of the airbag decreases. The theoretical model indicates that with an increase in internal pressure and the spacing of the center ribs, the initial strain energy of the membrane increases, leading to a decrease in the kinetic energy dissipation of the airbag to the projectile and subsequently reducing the ballistic limit of the airbag. This research provides a theoretical foundation and basis for the structural design and analysis of energy dissipation patterns in inflatable structures. It expands the potential applications of inflatable composite structures in the field of ballistics.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118734"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722727","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

Analytical solutions for large-deflection bending of variable-thickness inhomogeneous functional graded composite circular plates with parameterized boundaries under hygro-thermo-mechanical loads 具有参数化边界的变厚度非均质功能分级复合圆板在湿热力学载荷作用下的大挠度弯曲解析解

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-22 DOI: 10.1016/j.compstruct.2024.118721

Qiang Yu , Hongli Gu , Shuaimin Wang , Hang Xu

{"title":"Analytical solutions for large-deflection bending of variable-thickness inhomogeneous functional graded composite circular plates with parameterized boundaries under hygro-thermo-mechanical loads","authors":"Qiang Yu , Hongli Gu , Shuaimin Wang , Hang Xu","doi":"10.1016/j.compstruct.2024.118721","DOIUrl":"10.1016/j.compstruct.2024.118721","url":null,"abstract":"<div><div>A brand-new hygro-thermo-mechanical bending model of the inhomogeneous concave and convex composite circular plates having varying thickness undergoing large deformation resting on nonlinear tri-parameter spring and shear elastic layers is proposed. Three-dimensional analytical hygrothermal field of circular plate is demonstrated with non-uniform thermal and moisture diffusion coefficients in axial variation, while thickness and elastic module of material are modeled in quadratically change and sufficiently summarized in normalization. The circled boundaries with arbitrary translational and rotational constraints are parameterized with feasible region of elastic parameters highlighted in rectangular domain by Linear Programming method. Two reduced-order integro-differential governing equations for the composite circular plates under extreme load have been derived, while analytical bending solutions are obtained by an employed homotopy-based analytical scheme with accuracy verified and convergence accelerated by truncation and iteration. Whether thickness or elastic module of composite material is variable, the final outcome on plate structural strength is the discrepancy of bending stiffness with different load capacity, with the former revealing more sensitive than the latter under the condition of same values. Once amplitude and distribution of hygrothermal load are determined, influence on large-deflection bending of circular plates exists at a limited range of nonlinearity, while non-uniform distribution of thermal expansion and moisture concentration aggravates bending effects only within this range.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118721"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707187","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

On a fully three-dimensional bending analysis of very thick smart composite cube-like bulk structures 关于超厚智能复合立方体结构的全三维弯曲分析

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-22 DOI: 10.1016/j.compstruct.2024.118733

Mohammad Malikan , Shahriar Dastjerdi , Victor A. Eremeyev , Mehran Kadkhodayan

{"title":"On a fully three-dimensional bending analysis of very thick smart composite cube-like bulk structures","authors":"Mohammad Malikan , Shahriar Dastjerdi , Victor A. Eremeyev , Mehran Kadkhodayan","doi":"10.1016/j.compstruct.2024.118733","DOIUrl":"10.1016/j.compstruct.2024.118733","url":null,"abstract":"<div><div>Here we discuss the behaviour of very thick composite plates considering electro-magneto-elastic coupling of various types using fully three-dimensional (3D) kinematics. Published research highlights a lack of studies on the 3D mechanics of smart composite plates that integrate both higher-order (flexoelectric/flexomagnetic) and lower-order (piezoelectric/piezomagnetic) multiple physical fields (electro-magneto-elastic). The common approach to achieving the targeted and desired mechanical behavior within such composites could involve using structural elements. This gap can potentially be addressed by amalgamating the term ∂/∂z with the 2D governing equations of plates. This expression indicates alterations in thickness, in which <em>z</em> is the coordinate dedicated to the thickness. The governing equations can be created by operating on the variational method which enables us to establish and settle the 3D bending equations of the bulk structure. The pointed-out equations have been influenced by the implementation of additional hypotheses, such as von Kármán’s strain and complicated 3D tensor relations. Inserting the term ∂/∂z into the mathematical model renders that the analytical solution techniques are unable to assist us in obtaining numerical results. Consequently, a semi-analytical solving method grounded on the polynomial phrases facilitates the acquisition of the required solution. This fully 3D bending study of very thick piezocomposite cube-like bulk structures (CBS) can be an original reference in the field of mechanics of intelligent plate-like structures.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118733"},"PeriodicalIF":6.3,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722730","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

Fatigue life prognosis of composite structures using a transferable deep reinforcement learning-based approach 使用基于可转移深度强化学习的方法预测复合材料结构的疲劳寿命

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-20 DOI: 10.1016/j.compstruct.2024.118727

Cheng Liu, Yan Chen, Xuebing Xu

{"title":"Fatigue life prognosis of composite structures using a transferable deep reinforcement learning-based approach","authors":"Cheng Liu, Yan Chen, Xuebing Xu","doi":"10.1016/j.compstruct.2024.118727","DOIUrl":"10.1016/j.compstruct.2024.118727","url":null,"abstract":"<div><div>Accurately predicting the remaining useful life (RUL) of Carbon Fiber Reinforced Polymer (CFRP) structures under fatigue loading is crucial for enhancing safety and minimizing maintenance costs, especially in industries like aerospace and automotive. However, the complex physical properties of CFRP, combined with the scarcity of real-world damage-condition data, make this task extremely challenging. To address these issues, we propose a novel deep reinforcement learning (DRL)-based prognostic method. Our approach integrates Denoising Autoencoder (DAE) and Transformer architectures to construct a powerful DRL Policy Network, capable of extracting high-quality features from X-ray records to capture the subtle progression of damage in CFRP structures. Additionally, we employ advanced data augmentation techniques to overcome the limitations of small datasets and introduce transfer learning to extend the model’s generalization capabilities across different CFRP structures. By pre-training on diverse CFRP datasets, our model achieves highly accurate RUL predictions for new designs, even with minimal labeled data from the target structure. Experimental results demonstrate that our method significantly outperforms current state-of-the-art (SOTA) techniques, offering a scalable, efficient, and practical solution for the real-world monitoring and prognostics of CFRP structures, with broad potential for industrial applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118727"},"PeriodicalIF":6.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707179","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

Closed-form analytical solution for local buckling of omega-stringer-stiffened composite panels under compression 压缩条件下Ω弦杆加固复合板局部屈曲的闭式解析解

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-20 DOI: 10.1016/j.compstruct.2024.118716

Cherine El Yaakoubi-Mesbah, Christian Mittelstedt

{"title":"Closed-form analytical solution for local buckling of omega-stringer-stiffened composite panels under compression","authors":"Cherine El Yaakoubi-Mesbah, Christian Mittelstedt","doi":"10.1016/j.compstruct.2024.118716","DOIUrl":"10.1016/j.compstruct.2024.118716","url":null,"abstract":"<div><div>The use of stiffened thin-walled lightweight structures in e.g. aircraft fuselages requires efficient calculation methods to describe the stability behavior. In this work, a closed-form model for the local buckling analysis of orthotropic composite plates braced by omega-stringers is developed. The problem can be reduced to a plate simply supported at all edges subjected to uniaxial compression with eccentrically attached stringer feet, while the stringer itself is modeled as restraint stiffnesses along the longitudinal edges. The discontinuities in the stiffnesses introduced by the stringer feet result in discontinuities in the curvature behavior and the shear distortion of the structure. In order to map this influence on the local buckling behavior, the reduced model is divided into plate segments of corresponding stiffnesses, for which Ritz-based approach functions for the deformations are defined. Finally, an explicit formulation of the buckling load is derived using the energy method. To validate the model, the Lévy solution is obtained and a finite element analysis is conducted. The results of the parameter studies demonstrate excellent agreement within the design space of the aviation application area.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118716"},"PeriodicalIF":6.3,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707182","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