European Journal of Mechanics A-Solids最新文献

{"title":"High-frequency mechanical impedance of rubber mounts: Experimental characterization and resonance mechanisms","authors":"María-José García-Tárrago ,&nbsp;José Calaf-Chica ,&nbsp;Francisco-Javier Gómez-Gil","doi":"10.1016/j.euromechsol.2025.105677","DOIUrl":"10.1016/j.euromechsol.2025.105677","url":null,"abstract":"<div><div>The characterization of the dynamic behavior of rubber anti-vibration mounts in electric motor systems is crucial for optimizing the vibro-acoustic performance of electric vehicle interiors. The transition to electric propulsion has revealed new high-frequency vibration sources (up to 3 kHz), including electromagnetic harmonics from motor commutation. Addressing these vibrations is essential to improve passenger comfort and promote the adoption of electric vehicles. This study presents an in-depth investigation into the dynamic response of cylindrical rubber mounts, employing a custom-designed test rig capable of evaluating performance up to 3 kHz. The experimental setup follows the UNE-EN ISO 10846 standard to ensure accurate measurements of vibro-acoustic transfer properties. To minimize high-frequency transmission through the test bench structure, a seismic mass serves as a decoupling element and stable reference. Force sensors are integrated into the seismic mass, ensuring that measured forces correspond solely to those applied to the rubber specimen, thus isolating the results from structural influences. The experimental findings reveal significant deviations in both the mechanical impedance modulus and the offset angle compared to behaviors observed at lower frequencies, which have been the primary focus of previous studies on vehicles with internal combustion engines. At low frequencies, stiffness-dominated behavior prevails; however, at higher frequencies, inertial effects and wave propagation phenomena become significant, altering the stiffness modulus curve and leading to the appearance of a peak characteristic of a resonance frequency. High-frequency responses are further analyzed through implicit harmonic analysis using advanced finite element modeling techniques. The experimental results are validated through this analysis, as the frequency at which the observed peak occurs coincides with a resonance frequency of the component identified in the harmonic analysis. Furthermore, this research demonstrates that these resonances, along with wave propagation effects, contribute to a complex deformation field, potentially accelerating material degradation and failure, addressing the importance of optimizing the design of these components to enhance their durability and performance.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105677"},"PeriodicalIF":4.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912415","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}

{"title":"Void growth in the lithium anode of a solid state battery","authors":"Ashley M. Roach ,&nbsp;Wenqing Zhu ,&nbsp;Sundeep Vema ,&nbsp;Robert M. McMeeking ,&nbsp;Clare P. Grey ,&nbsp;Vikram S. Deshpande ,&nbsp;Norman A. Fleck","doi":"10.1016/j.euromechsol.2025.105710","DOIUrl":"10.1016/j.euromechsol.2025.105710","url":null,"abstract":"<div><div>It has been conjectured that the growth of voids within the Li anode of a solid state battery promotes dendrites within the ceramic electrolyte and resists Li transport into the electrolyte. We explore experimentally the evolution of a pre-existing void within the Li anode of a solid state battery resulting from its stack pressure and/or a superposed electrical current. The battery comprises Li electrodes and an electrolyte made from Ta-doped lithium lanthanum zirconate (Li/LLZO/Li). A circular cylindrical void was generated within the Li layer and adjacent to the LLZO interface by withdrawing a niobium wire of diameter 200 μm from the Li layer prior to testing. The sensitivity of void collapse to applied pressure was determined by varying the radius to height of the Li pancake-layer and by varying the applied load. The evolution of specimen height with time and the closure rate of the voids are consistent with power law creep of the Li. An additional set of experiments was performed whereby the Li migrated into the LLZO substrate by imposition of a constant electrical current. It was found that the void shrinks at a rate consistent with migration of the Li layer into the LLZO, with negligible flux focussing in the vicinity of the void. The study has direct relevance to the effect of stack pressure and battery operation upon void evolution in a solid state Li battery.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105710"},"PeriodicalIF":4.4,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928620","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}

{"title":"Mechanical behaviors of star honeycombs with symmetry-broken lattices","authors":"Amin Montazeri ,&nbsp;Iman Ahmadian ,&nbsp;Ehsan Bahmanpour ,&nbsp;Amirhossein Saeedi ,&nbsp;Majid Safarabadi","doi":"10.1016/j.euromechsol.2025.105709","DOIUrl":"10.1016/j.euromechsol.2025.105709","url":null,"abstract":"<div><div>This study investigates the in-plane compression and flexural performance of star-shaped honeycomb metamaterials, focusing on conventional symmetric and novel symmetry-broken designs. The mechanical behavior of these metamaterials under compressive and bending loads was examined through a combination of experimental tests and finite element simulations. Stress-strain curves, deformation mechanisms, and energy absorption properties were analyzed to compare the benchmark honeycomb structure with the proposed single (SSS) and double (DSS) symmetry-broken models. Results show that both SSS and DSS models outperform the conventional star design in specific energy absorption (SEA) and effective Young's modulus (E_e) during compression, with DSS exhibiting 68.8 % higher E_e and SSS achieving 35.6 % higher SEA at 0.5 strain. Under flexural loading, the SSS design surpassed the conventional structure by approximately 26.8 % in SEA at 40 mm deflection. Additionally, the study explores the impact of different assembly mechanisms, including interspaced array and chiral vertex configurations, on compressive performance. It was found that assembly patterns significantly affect the load distribution and energy absorption of the metamaterials. Under out-of-plane compression, DSS and SSS honeycombs showed 19.73 % and 19.16 % higher SEA at 0.3 strain, respectively. Furthermore, the DSS design demonstrated 21.43 % greater SEA under out-of-plane bending compared to the benchmark. The SSS design, particularly when using interspaced array or chiral vertex assemblies, demonstrated superior SEA and structural stability compared to the benchmark and DSS models. This research highlights the potential of symmetry-broken honeycomb structures for applications requiring enhanced mechanical performance and energy absorption.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105709"},"PeriodicalIF":4.4,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912451","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}

{"title":"Unsteady thermoelastic-diffusive vibrations of a Bernoulli-Euler beam on an elastic foundation","authors":"Andrei V. Zemskov ,&nbsp;Le Van Hao","doi":"10.1016/j.euromechsol.2025.105707","DOIUrl":"10.1016/j.euromechsol.2025.105707","url":null,"abstract":"<div><div>This paper addresses the problem of unsteady vibrations of a Bernoulli–Euler beam, taking into account the relaxation effects in thermal and diffusion processes. The original mathematical model comprises a system of equations describing unsteady bending vibrations, incorporating both heat and mass transfer. These equations are derived from the general model of thermoelastic diffusion in a continuum, using the variational D'Alembert principle. As an example, a simply supported three-component beam composed of an alloy of zinc, copper, and aluminum is considered. The interaction among the mechanical, thermal, and diffusion fields in the beam is investigated under a mechanical load distributed along its length. The influence of relaxation effects on the kinetics of heat and mass transfer is analyzed. The solution is presented both in analytical form and as spatiotemporal 3D graphs of displacement, temperature increment, and concentration increment fields.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105707"},"PeriodicalIF":4.4,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928622","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}

{"title":"Computational analysis of limit point instability in circular magnetoelastic membranes","authors":"Awantika Mishra,&nbsp;Aquib Ahmad Siddiqui,&nbsp;Sushma Santapuri","doi":"10.1016/j.euromechsol.2025.105686","DOIUrl":"10.1016/j.euromechsol.2025.105686","url":null,"abstract":"<div><div>Membranes made of soft materials are prone to limit point instability, characterized by a loss of monotonicity in pressure-deflection relationship. In soft active materials that respond to external fields (e.g. magneto-/electro-elastic materials), onset of this instability can be controlled using the external field. In this work, limit point instability in magnetoelastic circular membranes is analyzed in the presence of magnetic field and transverse pressure. Forces and deformation in the membrane are studied for a weakly magnetizable material medium under axisymmetric loading and transverse magnetic field while incorporating material nonlinearity, Maxwell stress, and pre-stretch effects. An <span><math><mi>h</mi></math></span>-order membrane theory is presented and the resulting nonlinear system of ordinary differential equations are solved using a boundary value problem (BVP) solver in MATLAB. BVP solvers are prone to convergence issues for nonlinear problems and exhibit a high sensitivity to the initial guesses, particularly in the unstable regime. An iterative computational scheme is proposed here to alleviate this issue by improving the initial guesses provided to the solver. The results are validated with existing literature for special cases and several parametric studies are performed to understand the response of a magnetoelastic membrane actuator under combined magnetomechanical loading. Improved convergence for a wide range of input values is observed, allowing a more comprehensive study of soft magnetoelastic membrane actuators. The computational framework presented in this work can be applied towards device design in soft robotics.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105686"},"PeriodicalIF":4.4,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928621","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}

{"title":"A FFT-based numerical scheme for the transient conductivity of heterogeneous materials with non-periodic boundary conditions","authors":"Abdoul Magid Amadou Sanoko ,&nbsp;Simon Essongue ,&nbsp;Lionel Gélébart ,&nbsp;Lucas Lapostolle ,&nbsp;Léo Morin ,&nbsp;Joseph Paux","doi":"10.1016/j.euromechsol.2025.105680","DOIUrl":"10.1016/j.euromechsol.2025.105680","url":null,"abstract":"<div><div>The aim of this work is to develop FFT-based solvers for transient diffusion in heterogeneous materials subjected to non-periodic (Dirichlet/Neumann) boundary conditions. We focus on a problem of thermal conductivity and derive a theta-method which includes an implicit solver for transient thermal conductivity in heterogeneous materials. The method is based on a fixed-point iterative solution of an auxiliary problem obtained by a Galerkin discretization using an approximation space based on mixed sine–cosine series. The solution field is decomposed as a known term verifying the boundary conditions and a fluctuation (unknown) term described by appropriate sine–cosine series. The solution of the auxiliary problem involves discrete sine–cosine transforms, of type I and III, which makes the solver rely on the computational complexity of fast Fourier transforms. The method is applied to the prediction of transient thermal fields in a composite material subjected to non periodic boundary conditions.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"113 ","pages":"Article 105680"},"PeriodicalIF":4.4,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916463","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}

{"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}

{"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}

{"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}

{"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}