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Free vibration response of sandwich composites with auxetic chiral core 具有辅助手性芯的夹层复合材料的自由振动响应
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-29 DOI: 10.1016/j.euromechsol.2025.105700
Dilek Atilla Yolcu , Berkan Öztürk , Gözde Sarı , Buket Okutan Baba
{"title":"Free vibration response of sandwich composites with auxetic chiral core","authors":"Dilek Atilla Yolcu ,&nbsp;Berkan Öztürk ,&nbsp;Gözde Sarı ,&nbsp;Buket Okutan Baba","doi":"10.1016/j.euromechsol.2025.105700","DOIUrl":"10.1016/j.euromechsol.2025.105700","url":null,"abstract":"<div><div>The aim of this study was to investigate the influence of auxetic core structure pattern and boundary conditions on the vibration behavior of square flat sandwich panels. The sandwich composite panels consist of three layers, with the top and bottom skins of orthotropic E-glass/epoxy laminates and the central auxetic core layer of chiral structures with negative Poisson's ratio using the isotropic PLA material. The core structures consist of tetrachiral, anti-tetrachiral, and hexachiral auxetic cells with constant ligament length and node diameter. The face sheets were produced by the hand-layup method and a three-dimensional printing technique was utilized to create auxetic cores. In order to find natural frequencies and the mode shapes of sandwich panels with different auxetic cores, the numerical analyses were performed for the sandwich panels under free-free (F–F), simply supported (S–S) and clamped (C–C) boundary conditions using ANSYS software. Additionally, the finite element analysis results were compared with vibration test results that were conducted on sandwich panels under only the freely boundary condition to confirm the accuracy and efficiency of the finite element analysis. The results obtained from the simulation suggest that the auxetic chiral cores have promising properties for dynamic performance. In particular, hexachiral cores were shown to effectively increase the natural frequency compared to anti-tetrachiral and tetrachiral cores. Although the use of auxetic core structure in sandwich structures significantly increases the natural frequency, the natural frequencies of sandwich panels with different core patterns are close to each other.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105700"},"PeriodicalIF":4.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A systematic finite element procedure for flexoelectric piezoelectric nanobeams using the asymptotic numerical method 用渐近数值方法对柔性压电纳米梁进行了系统的有限元分析
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-26 DOI: 10.1016/j.euromechsol.2025.105679
S. Abdelkhalek , F. Najar
{"title":"A systematic finite element procedure for flexoelectric piezoelectric nanobeams using the asymptotic numerical method","authors":"S. Abdelkhalek ,&nbsp;F. Najar","doi":"10.1016/j.euromechsol.2025.105679","DOIUrl":"10.1016/j.euromechsol.2025.105679","url":null,"abstract":"<div><div>Analysis of small-scale beam structures under the combined effects of flexoelectric and piezoelectric responses is of interest in this work. The problem is tackled by the derivation of a mixed finite element model accounting for geometric nonlinearity and large strains through a total Lagrangian representation, so that the von Karman strain can be considered. In addition, a Penalty method is introduced to account for higher order stress tensors. The asymptotic numerical method (ANM) is implemented for the first time in this context to deal with nonlinearities. To avoid tedious manual calculation of the ANM power series terms, a systematic procedure is proposed in this work with an application to a clamped–clamped nanobeam. The obtained model is applied for different flexoelectric-piezoelectric materials, and the results indicate that the applied electric voltage can lead to buckling of the beam. However, this instability is observed for negative voltages for some materials, and positive voltages for others, depending on a combination of flexoelectric and piezoelectric coefficients of the material.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105679"},"PeriodicalIF":4.4,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anisotropic elastic metamaterials for novel wave manipulation: a review 用于新型波操纵的各向异性弹性超材料：综述
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-26 DOI: 10.1016/j.euromechsol.2025.105696
Jeseung Lee , Yoon Young Kim
{"title":"Anisotropic elastic metamaterials for novel wave manipulation: a review","authors":"Jeseung Lee ,&nbsp;Yoon Young Kim","doi":"10.1016/j.euromechsol.2025.105696","DOIUrl":"10.1016/j.euromechsol.2025.105696","url":null,"abstract":"<div><div>Elastic waves are crucial in non-destructive testing and evaluation across industrial and medical fields. While elastic metamaterials have been extensively studied for elaborate wave manipulation, those exhibiting isotropic or orthotropic behavior often fail to achieve certain elastic wave phenomena involving coupled normal and shear deformations. Therefore, their applicability is limited in many practical contexts. To overcome these limitations, elastic metamaterials with extraordinary anisotropy—exhibiting properties not found in nature—have emerged as a promising solution. This paper elucidates the fundamental design principles of anisotropic elastic metamaterials and their applications for unconventional wave manipulation.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105696"},"PeriodicalIF":4.4,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Statistical chain-based model for predicting drug release from degradable hydrogels 基于统计链的可降解水凝胶药物释放预测模型
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-25 DOI: 10.1016/j.euromechsol.2025.105699
Deep Malu , Dongjing He , Wenting Shi , M.G. Finn , Yuhang Hu
{"title":"Statistical chain-based model for predicting drug release from degradable hydrogels","authors":"Deep Malu ,&nbsp;Dongjing He ,&nbsp;Wenting Shi ,&nbsp;M.G. Finn ,&nbsp;Yuhang Hu","doi":"10.1016/j.euromechsol.2025.105699","DOIUrl":"10.1016/j.euromechsol.2025.105699","url":null,"abstract":"<div><div>Hydrogel-based drug delivery systems have emerged as promising platforms for controlled cargo release due to their tunable degradation and swelling properties. These systems can trap drug particles within their polymeric network, releasing them gradually as the network degrades and swells. This study presents a statistical chain-based multiphysics model that integrates degradation, swelling, and diffusion to predict drug release profiles from degradable hydrogels. The model, calibrated using a recently developed degradable hydrogel, incorporates the interplay between chain-level degradation, dynamic mesh size changes, and evolving cargo diffusivity. Experimental validation demonstrates the model's accuracy, and parametric studies highlight the impact of various design parameters such as cargo size, gel geometry, and crosslinker functionality on release profiles. This framework provides insights into hydrogel design for tailored drug release, addressing limitations in current phenomenological approaches.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105699"},"PeriodicalIF":4.4,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A semi-analytical method for determining homogenized relaxation times and moduli in Prony series of a heterogeneous viscoelastic material 确定非均质粘弹性材料的均质弛豫时间和模量的半解析方法
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-25 DOI: 10.1016/j.euromechsol.2025.105683
Huilin Jia , Zifeng Yuan
{"title":"A semi-analytical method for determining homogenized relaxation times and moduli in Prony series of a heterogeneous viscoelastic material","authors":"Huilin Jia ,&nbsp;Zifeng Yuan","doi":"10.1016/j.euromechsol.2025.105683","DOIUrl":"10.1016/j.euromechsol.2025.105683","url":null,"abstract":"<div><div>This work introduces a semi-analytical method to obtain homogenized relaxation times and moduli in terms of Prony series of a heterogeneous viscoelastic material. This can be treated as an extension of linear homogenization theory which calculates homogenized elastic properties of a heterogeneous elastic material. The heterogeneous viscoelastic material is consist of multiple phases where each phase is assumed as a standard-solid viscoelastic material. The idea of so-called reduced-order-homogenization method is introduced to propose a set of residual-free governing equations with respect to the averaged strains and eigenstrains of all the phases. The set of governing equations can be rewritten as a set of ordinary differential equations (ODEs), which can be solved analytically to obtain relationship between the phase strains and the macroscopic strains. The solution of the ODEs stems from an eigenvalue problem, where the eigenvalues are the homogenized relaxation times. In addition, the relaxation moduli can be evaluated through the ODEs as well. Accordingly, a homogenized viscoelastic material in term of Prony series can be determined. Four sets of numerical tests are proposed to verify the semi-analytical method: unit cell tests, tension tests on a plate with a hole, pure bending tests, and torsion tests. The results from these tests demonstrate a strong agreement between the homogenized model and direct numerical simulations. Additionally, we compared our model against experimental measurements, further confirming the accuracy and reliability of our proposed approach.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105683"},"PeriodicalIF":4.4,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bending mechanics of biomimetic scale plates 仿生尺度板的弯曲力学
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-25 DOI: 10.1016/j.euromechsol.2025.105664
Pranta Rahman Sarkar , Hossein Ebrahimi , Md Shahjahan Hossain , Hessein Ali , Ranajay Ghosh
{"title":"Bending mechanics of biomimetic scale plates","authors":"Pranta Rahman Sarkar ,&nbsp;Hossein Ebrahimi ,&nbsp;Md Shahjahan Hossain ,&nbsp;Hessein Ali ,&nbsp;Ranajay Ghosh","doi":"10.1016/j.euromechsol.2025.105664","DOIUrl":"10.1016/j.euromechsol.2025.105664","url":null,"abstract":"<div><div>Dermal scale-inspired structures are a unique class of multi-material systems that can exhibit significant nonlinearity and evolving anisotropy, even in small strains. In this work, architecture–property relationships are derived for both synclastic and anticlastic curvatures of the plate using analytical modeling, finite elements, and experiments. The developed model outlines analytical relationships between geometry, deformation, and bending response of the system. The results show that, as the scales engage, both synclastic and anticlastic deformations show non-linear scale contact kinematics and cross-curvature sensitivity of moments, resulting in strong curvature-dependent elastic nonlinearity and emergent anisotropy. The anisotropy of bending rigidities and their evolution with curvatures are affected by both the direction and magnitude of bending, as well as scale geometry parameters, and their distribution on the substrate. Similar to earlier beam-like substrates, kinematic locked states were found to occur; however, their existence and evolution are also strongly determined by scale geometry and imposed cross-curvatures. This validated model helps us to quantify bending response, locking behavior, and their geometric dependence, paving the way for a deeper understanding of the nature of nonlinearity and anisotropy of these systems.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105664"},"PeriodicalIF":4.4,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A finite viscoelastic phase-field model for prediction of crack propagation speed in elastomers 弹性体裂纹扩展速度预测的有限粘弹性相场模型
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-24 DOI: 10.1016/j.euromechsol.2025.105678
Jacopo Ciambella , Giovanni Lancioni , Nico Stortini
{"title":"A finite viscoelastic phase-field model for prediction of crack propagation speed in elastomers","authors":"Jacopo Ciambella ,&nbsp;Giovanni Lancioni ,&nbsp;Nico Stortini","doi":"10.1016/j.euromechsol.2025.105678","DOIUrl":"10.1016/j.euromechsol.2025.105678","url":null,"abstract":"<div><div>Crack propagation in soft viscoelastic solids is crucial in many applications, yet accurate modeling of their fracture behavior, particularly the rate-dependent fracture toughness, remains a challenge. We address this by proposing a thermodynamically consistent phase-field fracture model for viscoelastic materials. The model incorporates both equilibrium and non-equilibrium elastic energies, along with distinct dissipation mechanisms for viscous losses and irreversible damage processes. Importantly, two characteristic time scales are introduced, reflecting the distinct nature of viscous relaxation and damage evolution, both of which significantly influence crack propagation dynamics. Numerical simulations are performed to investigate the impact of the different energy contributions on the fracture propagation in elastomeric membranes, accompanied by comparisons to experimental results.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105678"},"PeriodicalIF":4.4,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wave propagation analysis of functionally graded bio-composite circular plates using an improved sinusoidal shear deformation theory resting on an advanced viscoelastic foundation 基于先进粘弹性基础的改进正弦剪切变形理论的功能梯度生物复合材料圆板波传播分析
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-23 DOI: 10.1016/j.euromechsol.2025.105688
Mehran Safarpour , Hamed Safarpour , Omer Civalek
{"title":"Wave propagation analysis of functionally graded bio-composite circular plates using an improved sinusoidal shear deformation theory resting on an advanced viscoelastic foundation","authors":"Mehran Safarpour ,&nbsp;Hamed Safarpour ,&nbsp;Omer Civalek","doi":"10.1016/j.euromechsol.2025.105688","DOIUrl":"10.1016/j.euromechsol.2025.105688","url":null,"abstract":"<div><div>This study investigates the wave propagation characteristics of functionally graded (FG) bio-composite circular plates using an improved sinusoidal shear deformation theory (ISSDT) resting on an advanced viscoelastic substrate. FG bio-composites, composed of natural fibers and biodegradable matrices, offer superior mechanical performance with sustainability benefits, making them ideal for structural applications in aerospace, biomedical, and marine engineering. The ISSDT accounts for transverse shear deformation and thickness stretching effects, enhancing the accuracy of wave dispersion analysis. The governing equations are derived using Hamilton's principle and are solved via the harmonic differential quadrature method (HDQM) along with radial direction, ensuring computational efficiency and precision. The influence of material gradation, boundary conditions, and geometric parameters on phase velocities is examined in detail. The study reveals that increasing the volume fraction of bio-composite constituents significantly alters the wave characteristics, affecting both the fundamental and higher-order wave modes. Additionally, the inclusion of thickness stretching in the ISSDT leads to improved predictions compared to classical and higher-order shear deformation theories. The HDQM proves to be a robust numerical tool, efficiently handling the complex boundary conditions associated with circular FG plates. The findings provide valuable insights into the dynamic behavior of FG bio-composite structures, guiding their optimized design for vibration control and wave manipulation applications. This research contributes to the growing field of sustainable composite materials and advances the understanding of wave mechanics in FG bio-composites.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"112 ","pages":"Article 105688"},"PeriodicalIF":4.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimal grading of elastic modulus at contact corners with friction with application in fibrillar adhesives 纤维胶粘剂中摩擦接触角弹性模量的最佳分级
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-23 DOI: 10.1016/j.euromechsol.2025.105673
Shi-Wen Chen , Gang-Feng Wang , Michele Ciavarella
{"title":"Optimal grading of elastic modulus at contact corners with friction with application in fibrillar adhesives","authors":"Shi-Wen Chen ,&nbsp;Gang-Feng Wang ,&nbsp;Michele Ciavarella","doi":"10.1016/j.euromechsol.2025.105673","DOIUrl":"10.1016/j.euromechsol.2025.105673","url":null,"abstract":"<div><div>Recent studies have reported that micropillars composed of graded materials exhibit high adhesion performance in fibrillar adhesive systems. To uncover the origin of this enhanced performance and further promote the application of graded materials, we investigate the general contact mechanics of wedges composed of power-law graded materials. Our findings show that the stress singularity at the apex of the wedge can be eliminated by increasing the exponent of the power-law modulus. For cases with perfectly bonded interfaces, frictionless interfaces, and interfaces with Coulomb friction, the critical conditions for eliminating stress singularities are presented, thereby suggesting how to obtain optimal designs.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105673"},"PeriodicalIF":4.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the future of experimental mechanics in the digital world: An eikological perspective 论数字世界中实验力学的未来：一个生态学的视角
IF 4.4 2区 工程技术
European Journal of Mechanics A-Solids Pub Date : 2025-04-22 DOI: 10.1016/j.euromechsol.2025.105654
François Hild, Stéphane Roux
{"title":"On the future of experimental mechanics in the digital world: An eikological perspective","authors":"François Hild,&nbsp;Stéphane Roux","doi":"10.1016/j.euromechsol.2025.105654","DOIUrl":"10.1016/j.euromechsol.2025.105654","url":null,"abstract":"<div><div>Quantitative imaging is at the heart of the renewal of experimental mechanics. Through a multitude of modalities and scales, it allows the structural characterization to be enriched by its kinematic expression under mechanical but also multiphysical loadings, in two or three dimensional <em>in situ</em> configurations. It also concerns materials from the finest scales to engineering structures. Kinematic and thermal measurements extracted from these imaging tools may be linked to mechanical models by exploiting their synergy, namely, experimental measurements feed models, which in turn enable for the measurement of mechanically significant quantities in a set of images and experimental data.</div><div>As (very) big data providers, experiments contribute to the current and future developments of mechanical sciences. This paper discusses how experimental mechanics has benefited from the use of images to analyze experiments, and the related challenges that still arise, in particular, for digital image correlation techniques.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105654"},"PeriodicalIF":4.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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