Composite Structures最新文献

{"title":"Neural networks based inverse design of inhomogeneous tetrachiral honeycombs for desired deformation","authors":"Linzhe Du ,&nbsp;Jian Sun ,&nbsp;Yanju Liu ,&nbsp;Jinsong Leng","doi":"10.1016/j.compstruct.2025.119236","DOIUrl":"10.1016/j.compstruct.2025.119236","url":null,"abstract":"<div><div>The challenge of achieving efficient inverse design for honeycomb structures with desired deformations has persisted. To address this, a machine learning framework including two neural networks is introduced, with one used for sensitivity analysis and dataset generation, while the other for inverse design. A tetrachiral honeycomb structure is parametrically modeled using Python scripts and subsequently analyzed with finite element method (FEM) software. A dataset mapping unit cell parameters to honeycomb deformations is fabricated by FEM for training a forward neural network, which has an R-squared value of 0.9680. Based on this trained neural network, four high sensitive parameters were selected for inverse design by sensitive analysis. Then, a dimension-reduced dataset is created to train an inverse neural network with an mean R-squared value of 0.9909. Finally, experimental verifications were performed, which demonstrates an excellent agreement within the design domain. This approach offers promising potential for tailoring honeycomb structures with desired deformation, while also enabling the inverse design of metamaterials with customized properties.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119236"},"PeriodicalIF":6.3,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deformation response and enhanced energy absorption capacity of a novel re-entrant honeycomb with hybrid structures and bi-material under in-plane compression","authors":"C.Y. Cui ,&nbsp;T. Chen ,&nbsp;Y.T. Qiao ,&nbsp;X.Y. Kuang ,&nbsp;L.X. Hua ,&nbsp;X.G. Cui ,&nbsp;H.F. Yan","doi":"10.1016/j.compstruct.2025.119268","DOIUrl":"10.1016/j.compstruct.2025.119268","url":null,"abstract":"<div><div>Re-entrant hybrid honeycomb attracts significant attention due to its excellent in-plane compression performance, yet achieving a balance between energy absorption and auxetic effects remains a significant challenge. To address this, we propose a novel re-entrant diamond-enhanced honeycomb (RE-DEH) that combines two geometric designs: the re-entrant honeycomb (REH) and diamond-enhanced honeycomb (DEH). Compared to REH with identical wall thicknesses, the RE-DEH demonstrates significantly higher specific stiffness and Specific Energy Absorption (SEA). Additionally, a parametric study of the geometric configuration reveals that the inclination angle <span><math><mrow><mi>a</mi></mrow></math></span> of the REH is the dominant factor governing both energy absorption capacity and Poisson’s ratio. Further optimization using a bi-material configuration − where modified PLA materials of varying stiffness are applied to REH and DEH regions − reduces the magnitude of the average Poisson’s ratio by 50 % (from −0.36 to −0.54) while maintaining low relative density. Simultaneously, this design increases the SEA to 1.20 J/g, representing a 23.71 % enhancement over single-material counterparts. Therefore, the bi-material structure design is an effective strategy to overcome the trade-off between the energy absorption and auxetic effect, providing a new approach for the optimization of honeycomb structure.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119268"},"PeriodicalIF":6.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deployment of bistable composite tape springs with non-uniform curvatures","authors":"Mateen Sattari,&nbsp;Jacob G. Daye,&nbsp;Andrew J. Lee","doi":"10.1016/j.compstruct.2025.119235","DOIUrl":"10.1016/j.compstruct.2025.119235","url":null,"abstract":"<div><div>The uncoiling deployment of bistable composite tape springs with parabolic, elliptical, catenary, and circular cross-sections are investigated. Unlike cylindrical monostable shells, bistable tape springs exhibit a smooth unrolling motion when actuated beyond their strain energy peak dividing the stable coiled and extended equilibrium states. The main contribution by this paper is characterizing the advantages in the deployment behavior of bistable tape springs if their cross-section deviates from the ubiquitous circular profile. The uncoiling deployment of cantilevered tape springs with optimized profiles is initiated with a linear actuator, measured with a motion capture system, and correlated with finite element analysis. The elliptical tape spring is found to uncoil the furthest from the root before exhibiting instability driven self-deployment, but has the shortest self-deployment duration due to releasing the largest amount of strain energy. Having the most energetic deployment is advantageous if boom lengths are to be scaled larger because more mass needs to be translated. The elliptical cross-section is also found to have the best stiffness performance while being most stowed volume efficient. Conversely, the circular tape spring has the slowest self-deployment due to releasing the least amount of strain energy.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119235"},"PeriodicalIF":6.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of rules of mixture for effective elastic properties in fibrous and particulate composite materials","authors":"Hassan Mohamed Abdelalim Abdalla","doi":"10.1016/j.compstruct.2025.119216","DOIUrl":"10.1016/j.compstruct.2025.119216","url":null,"abstract":"<div><div>Micromechanics based models have been playing an important role in predicting the effective elastic properties of particulate and fibrous linearly elastic composite materials. This paper reviews the simplest most widely-used class of micromechanics models, the so-called rules of mixture, and aims to clarify various misconceptions in their applicability by providing concise derivations from both the mechanics-of-materials and continuum-mechanics approaches. The paper critically reviews the areas in which these analytical models can yield good predictions of effective elastic properties and various historical interventions when properties are underestimated. Besides, it illustrates a generalized framework able to justify their assumptions as lower and upper bounds for elastic properties, though of modest practical application when compared to more refined theories. Eventually, the position of these models with respect to classic assumptions of dilute dispersion is investigated and emphasized with reference to experimental data.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119216"},"PeriodicalIF":6.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An efficient strategy for numerical implementation of 3D rebar-concrete interface element for integrating bond-slip behavior in RC structures simulation","authors":"Zhihao Tong,&nbsp;Lihua Xu,&nbsp;Le Huang,&nbsp;Chunlei Yu,&nbsp;Benhao Gao,&nbsp;Yin Chi","doi":"10.1016/j.compstruct.2025.119272","DOIUrl":"10.1016/j.compstruct.2025.119272","url":null,"abstract":"<div><div>Rational characterization of bond-slip behavior at the rebar-concrete interface constitutes a critical impact in evaluating the mechanical performance of reinforced concrete (RC) structures. This study presents a novel three-dimensional interface element using a user-defined element (UEL) subroutine, offering an advancement in realistically capturing nonlinear interfacial responses under diverse loading scenarios. A key innovation lies in the development of an efficient Python script for the insertion of interface elements within ABAQUS, addressing computational challenges in element deployment. The constitutive laws governing axial, radial, and coupled axial-radial interactions are elaborated to enhance the fidelity of bond-slip simulations. The numerical implementation of the interface element, based on the UEL subroutine, involves rigorous definitions of the element stiffness matrix, coordinate transformation matrix, and residual matrix, ensuring robust computational performance. Extensive validation against independent experimental results at both material and component levels demonstrates the accuracy of the interface element in predicting failure modes, damage evolution, and mechanical responses. The proposed approach represents a practical strategy for integrating bond-slip behavior into the nonlinear analysis of RC structures, offering a reliable solution for advancing structural engineering simulations.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119272"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of environmental conditions on the failure of double lap composite joints with different overlap lengths and adherend thicknesses","authors":"Aakash Paul ,&nbsp;Xiaodong Xu ,&nbsp;Takayuki Shimizu ,&nbsp;Michael R. Wisnom","doi":"10.1016/j.compstruct.2025.119265","DOIUrl":"10.1016/j.compstruct.2025.119265","url":null,"abstract":"<div><div>This paper provides a comprehensive study of the effects of environmental conditions on the failure of Double Lap Joints (DLJ) with composite adherends of different overlap lengths and thicknesses. The environmental conditions tested are Room Temperature Dry (RTD), Hot Temperature Dry (HTD) and Hot Temperature Wet (HTW). The mechanical properties of both the adhesive and composite adherends were characterised at these environmental conditions, showing conflicting trends. A new way of presenting the data based on simple calculations of strength or fracture dominated failure allows all the data to be shown on a single plot, and satisfactorily explains the failure modes, failure loads and opposite trends observed for a total of 13 DLJ configurations tested at the three environmental conditions.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119265"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active vibration control of a curved sandwich beam using a nonlinear PPF algorithm","authors":"Celia Hameury ,&nbsp;Marco Amabili","doi":"10.1016/j.compstruct.2025.119271","DOIUrl":"10.1016/j.compstruct.2025.119271","url":null,"abstract":"<div><div>Nonlinear behaviour resulting from large-amplitude vibrations is often categorized as softening or hardening, according to the direction of the shift in the natural frequency. While nonlinear hardening systems have been controlled in the past, often using positive position feedback (PPF) and both linear and nonlinear algorithms, softening systems have often been overlooked. In this experimental study, a curved sandwich beam with clamped boundary conditions when subject to large external forcing was subjected to various active vibration controllers based on linear and nonlinear PPF algorithms. The curved beam is a softening system presenting both quadratic and cubic stiffness terms. Piezoelectric patches were used as controller transducers. Both linear and nonlinear controller types were tested, with nonlinear controllers including both quadratic and cubic gain terms. Furthermore, single-input single-output (SISO) and multi-input multi-output (MIMO) architectures were both tested, with SISO controllers including only a single actuator and sensor pair and MIMO controllers involving two actuators and two sensors. While increasing the amplitude of the nonlinear terms in the not-optimized controller was found to significantly improve vibration attenuation, the optimized controller showed a smaller improvement following the introduction of nonlinear terms in its algorithm.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119271"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Equivalent model establishment based on the equivalent mechanical parameters optimization considering the modal behavior for curved concave hexagonal honeycomb sandwich structures","authors":"Xu Zhang ,&nbsp;Yaorui Tong ,&nbsp;Yan Fang ,&nbsp;Wei Li","doi":"10.1016/j.compstruct.2025.119267","DOIUrl":"10.1016/j.compstruct.2025.119267","url":null,"abstract":"<div><div>The curved sandwich structure has more uniform stress distribution and superior fluid dynamics performance, and the concave hexagonal honeycomb presents excellent anti-vibration and energy absorption. Establishing an equivalent model can significantly improve the efficiency of optimization design and performance analysis, and the reliability and precision of the model are directly associated with the accuracy of equivalent mechanical parameters of the honeycomb core. Modal behavior analysis can prevent the structural damage and failure caused by the resonance, and is particularly important to the dynamic design of sandwich structures. Hence, an equivalent model establishment method considering the influence of the modal behavior on the equivalent mechanical parameters is developed for the curved sandwich structure with concave hexagonal honeycomb. A preliminary equivalent model is established by combining the derived equivalent mechanical parameters along the in-plane and out-of-plane directions of the core with the sandwich panel theory. Three-point bending tests are performed on curved concave hexagonal honeycomb sandwich structures with photosensitive resin core and carbon fiber face sheets, and the test data are compared with the finite element results of actual models and preliminary equivalent models. The equivalent mechanical parameters of the core (i.e., the material properties of the core’s equivalent model) are optimized by a genetic algorithm to minimize the average relative error between the first four modal frequencies of the equivalent model and those of the actual model, and the accuracy improvement of modified equivalent model is further understood through modal analysis. The results show that the simulated load–displacement curves of actual model and preliminary equivalent model are basically consistent with the test data of the actual model, and optimizing the equivalent mechanical parameters of the core, in which the modal behavior is considered, significantly reduces the relative errors between the equivalent model and actual model.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119267"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143950356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of a macrofiber piezoelectric energy harvester using artificial neural networks","authors":"Mohamed Taha Mhiri ,&nbsp;Walid Larbi ,&nbsp;Mnaouar Chouchane ,&nbsp;Mohamed Guerich","doi":"10.1016/j.compstruct.2025.119269","DOIUrl":"10.1016/j.compstruct.2025.119269","url":null,"abstract":"<div><div>This paper addresses the challenge of finding the optimal design parameters for a piezoelectric energy harvester. It presents an advanced simulation-driven optimization approach to determine the optimal geometric and circuit configuration for maximizing energy harvesting efficiency. Additionally, it enhances power output at an excitation frequency within the 10–100 Hz range, which is commonly found in the environment. The harvester consists of a cantilever beam partially coated with a macrofibre composite (MFC) piezoelectric patch, connected to a resistance load and subjected to base excitation. The optimization platform is built upon both analytical and finite element (FE) models of the energy harvesting system. For beams with a large aspect ratio (length/width), the analytical model based on Euler-Bernoulli beam theory is used, while for those with a small aspect ratio, a 3D FE model is employed to simulate the entire energy harvesting process. This approach enhances the accuracy of piezoelectric energy prediction. Due to the high computational cost and the significant time and memory required for running numerous simulations to evaluate the objective function (OF) used in the optimization, a more efficient solution is implemented based on a Neural Networks (NNs) model. Initially, the NNs is trained using a dataset derived from simulations and its performance and accuracy are rigorously assessed through various statistical methods. Once trained, the NNs serves as a surrogate model for OF evaluation, allowing for more efficient black-box optimization via a Genetic Algorithm (GA). Finally, a thorough analysis of the optimal design parameters obtained from the optimization process is conducted.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119269"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration of a functionally graded (FG) prestressed beam with a parabolic tendon under series of moving loads using higher order beam theory","authors":"Mesut Şimşek","doi":"10.1016/j.compstruct.2025.119270","DOIUrl":"10.1016/j.compstruct.2025.119270","url":null,"abstract":"<div><div>In this study, dynamic response of a functionally graded (FG) prestressed beam having a parabolic tendon under the action of the series of moving loads has been examined using the third order shear deformation beam theory. The material properties of the FG beam vary continuously in the thickness direction according to the power-law form. The time-dependent equations of the motion are obtained with the help of the Lagrange’s equations, and solved by means of the method of Newmark-<span><math><mi>β</mi></math></span>. The trial functions for axial, transverse deflections and rotation of the cross-sections are expressed in polynomial forms in order to obtain dynamic responses. Boundary conditions of the beam are satisfied by incorporating the auxiliary functions into the displacement functions. For the practical purposes, the only simply supported end conditions are considered. Assuming that the moving loads are equidistant with the same amplitude and move with the constant velocity, comprehensive numerical results are presented in tabular form and in figures so as to investigate the effects of the number of moving loads, the distance between the moving loads, the prestressing load, and the material gradient index on the dynamic deflection and the critical speed which causes resonance phenomena. Moreover, some comparisons are performed to validate the present procedure. The results show that the number of the moving loads travelling through the beam is the most important factor which causes the resonance.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"367 ","pages":"Article 119270"},"PeriodicalIF":6.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941941","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}