International Journal of Mechanical Sciences最新文献

{"title":"Customizing acoustic and electromagnetic unidirectional states in phoxonic topological insulators","authors":"Gang-Gang Xu ,&nbsp;Xiao-Shuang Li ,&nbsp;Tian-Xue Ma ,&nbsp;Xi-Xuan Liu ,&nbsp;Xiao-Wei Sun ,&nbsp;Yue-Sheng Wang","doi":"10.1016/j.ijmecsci.2025.110088","DOIUrl":"10.1016/j.ijmecsci.2025.110088","url":null,"abstract":"<div><div>Topological materials for classical waves offer remarkable potential in applications such as sensing, waveguiding and signal processing, leveraging topological protection effects like strong robustness, immunity to backscattering and unidirectional transmission. This work presents the simultaneous inverse design of pseudospin-dependent topological edge states for acoustic and electromagnetic waves in two-dimensional <span><math><msub><mrow><mi>C</mi></mrow><mrow><mtext>6v</mtext></mrow></msub></math></span> phoxonic crystals. The phoxonic crystals are created by arranging the silicon columns periodically in the air background. We propose a multi-objective optimization framework based on the NSGA-II collaborated with the finite element approach, where the bandgaps of acoustic and electromagnetic waves are treated separately as the objective values. The topological nature of bandgaps is determined by analyzing the positional relationships of paired degenerate modes through the modal field calculations, enabling the customization of one of the two bandgaps within the same unit cell. Unlike traditional approaches relying on the band inversion to induce topological phase transitions, the proposed approach directly generates a pair of unit cells with distinct topological properties for both wave types, achieving the maximum bandgap matching in each case. We further demonstrate the existence of the pseudospin-dependent topological edge states for both acoustic and electromagnetic waves, verifying their unidirectionality and robustness against backscattering and defects. This work establishes a systematic strategy for customizing phoxonic topological states, offering a new avenue for the inverse design of multi-functional devices based on both sound and light.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110088"},"PeriodicalIF":7.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Attenuation mechanism of Rayleigh waves by elastic metasurfaces in various layered half-spaces","authors":"Li Xiao ,&nbsp;Zhigang Cao ,&nbsp;Haoran Lu ,&nbsp;Ji Shi ,&nbsp;Yuanqiang Cai","doi":"10.1016/j.ijmecsci.2025.110113","DOIUrl":"10.1016/j.ijmecsci.2025.110113","url":null,"abstract":"<div><div>To comprehensively investigate the wave attenuation mechanisms of elastic metasurfaces in top-soft bottom-hard and top-hard bottom-soft layered half-spaces, we propose a general analytical framework combining the thin-layer method and effective medium theory to describe the interaction between Rayleigh waves and elastic metasurfaces. The results show that elastic metasurfaces exhibit different attenuation and mitigation effects in the two types of half-spaces. Specifically, in top-soft bottom-hard scenario, the first-order Rayleigh wave mode dominates surface energy propagation, and the elastic metasurfaces couples with it to attenuate surface energy. However, at the resonant frequency, higher-order modes carrying part surface energy persist, preventing effective isolation of surface energy. The overlying layer thickness affects the number of higher-order modes involved in propagation, which exhibits different wavefield characteristics and influences the attenuation effect. In top-hard bottom-soft scenario, the higher-order leaky Rayleigh wave modes dominate the surface energy, accompanied by energy leakage into the bulk. The elastic metasurfaces amplify their leakage effects, causing significant Rayleigh-to-bulk wave conversion and vibration reduction, even in the absence of a bandgap. Notably, elastic metasurfaces may induce vibration amplification at frequencies below the resonant frequency, which requires careful consideration during design. This framework offers valuable insights for designing elastic metasurfaces to mitigate vibration in practical layered foundations.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110113"},"PeriodicalIF":7.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration suppression of CFRC plates considering piezoelectric nonlinearity effects","authors":"Hui Zhang ,&nbsp;Wei Sun ,&nbsp;Yu Zhang ,&nbsp;Hongwei Ma ,&nbsp;Haitao Luo ,&nbsp;Feng Liu ,&nbsp;Kunpeng Xu","doi":"10.1016/j.ijmecsci.2025.110109","DOIUrl":"10.1016/j.ijmecsci.2025.110109","url":null,"abstract":"<div><div>Carbon fiber reinforced composite (CFRC) structural components often face complex operational environments in practical applications, which leads to particularly prominent vibration problems. To effectively suppress harmful vibrations, active control technology based on piezoelectric materials offers a viable solution, but it typically requires the application of a strong driving electric field. This study focuses on the nonlinear effects of piezoelectric materials under a strong electric field, and establishes a nonlinear electromechanical coupling model of CFRC plates with piezoelectric materials. On this basis, a fuzzy-LADRC (F-LADRC) adaptive controller with strong robustness is proposed for the vibration suppression of CFRC plates. By comparing the results of the literature and the COMSOL finite element model, the correctness of the model is preliminarily verified, and the characteristics of the piezoelectric nonlinear effect are discussed. A response test system is set up to characterize the nonlinear behavior of PZT-5H under a strong electric field, and the nonlinear electroelastic strain constant of the piezoelectric material is obtained through the parameter identification process. Finally, simulation and experimental tests show that the F-LADRC controller is more robust and has a better response speed. In addition, the analysis results show that better control effects can be achieved at a smaller input voltage when considering piezoelectric nonlinearity.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110109"},"PeriodicalIF":7.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blast mitigation of a novel curtain-type blast wall","authors":"Xingjun Fan ,&nbsp;Zhejian Li ,&nbsp;Hong Hao ,&nbsp;Wensu Chen","doi":"10.1016/j.ijmecsci.2025.110112","DOIUrl":"10.1016/j.ijmecsci.2025.110112","url":null,"abstract":"<div><div>Blast wall is an effective measure to block shock wave propagation for the protection of structures and people behind the wall in explosion events. In this study, an innovative curtain-type blast wall composed of individual hanging steel plates was proposed. Unlike conventional blast walls, which rely on the stiffness and strength of solid structures or the plastic deformation of sacrificial layers to counteract blast waves, the developed curtain-type blast wall attenuates blast waves by converting partial blast energy into kinetic energy and the interference between blast waves. This novel approach mitigates damage to conventional blast walls thus make the blast wall be able to resist multiple attacks and reduces the threats of secondary debris from damaged blast walls. To demonstrate the blast wave mitigation performance, numerical model was developed using LS-DYNA and validated against test data. The blast wave propagation and dynamic response of curtain-type blast walls against blast loads were simulated. It was found that using the curtain-type blast wall can achieve an overpressure (impulse) reduction of up to 70.2 % (63.8 %) as compared to the free field blast scenario. Parametric analysis was also carried out to investigate, the effect of factors such as the blast intensities, dimensions (width and height) of steel plates and spacing between individual steel plates on blast wave mitigation performance.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110112"},"PeriodicalIF":7.1,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of element diffusion behavior in bimetallic compound layer","authors":"Lianjing Hao ,&nbsp;Chaoyang Sun ,&nbsp;Huijun Liang ,&nbsp;Chunhui Wang ,&nbsp;Lingyun Qian ,&nbsp;Qingsong Han","doi":"10.1016/j.ijmecsci.2025.110108","DOIUrl":"10.1016/j.ijmecsci.2025.110108","url":null,"abstract":"<div><div>Element diffusion bonding process of bimetallic laminated materials directly influences the evolution of the microstructure and indirectly impacts the high-performance applications. In this paper, a variable coefficient element diffusion model is constructed considering the growth of compound layer to elucidate the element diffusion behavior in the compound layers. Subsequently, the compound layer growth kinetic equation is proposed considering thermoplastic deformation parameters and the element diffusion coefficients are calculated at different diffusion distances and diffusion times. It is found that there is a positive correlation between the deformation temperature, strain, holding time and diffusivity. Lower diffusion activation energy, and the increased number of grain boundary and lattice defects improve the diffusivity. The model can accurately predict the element diffusion behavior of bimetallic compound layer under dynamic compression conditions and the prediction error ranging from 4.36% to 6.37%. The sensitivity analysis of the deformation parameters that affect the diffusivity is investigated and this study provides valuable insights for the forming and application of dissimilar metal laminates.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110108"},"PeriodicalIF":7.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal diffusion mediated nucleation of vapor bubbles on metal microspheres","authors":"Chenliang Xia ,&nbsp;Zhibin Hu ,&nbsp;Fulong Wang ,&nbsp;Zeyu Wang ,&nbsp;Yuliang Wang","doi":"10.1016/j.ijmecsci.2025.110099","DOIUrl":"10.1016/j.ijmecsci.2025.110099","url":null,"abstract":"<div><div>Due to their unique dynamic behaviors, vapor bubbles have shown great potential in numerous applications, including photothermal therapy, micro/nano manipulation and manufacturing. In this study, we report the observation of vapor bubble nucleation on water-immersed metal microspheres triggered by a continuous wave laser. Upon laser exposure, a significant amount of heat is produced, leading to the nucleation of a vapor bubble on the microsphere. We found that the nucleation dynamics of these vapor bubbles can be effectively tuned by adjusting the laser power and microsphere size. More importantly, we observed a distinct dependence of the maximum bubble volume <em>V_max</em> on the deposited laser energy <em>E_d</em> for microspheres made from different materials and in different media environments of water, ethanol, and methanol. Mathematical models were derived to describe the spatiotemporal evolution of temperature in microspheres and surrounding water. Analytical analysis indicates that laser irradiation-induced heat generation and the subsequent thermal diffusion inside the microspheres govern the nucleation dynamics of vapor bubbles. By tuning thermal diffusivity and microsphere size, the dependence of <em>V_max</em> on <em>E_d</em> can be controlled. Furthermore, the experimentally observed <em>V_max</em> on <em>E_d</em> dependence was theoretically interpreted by considering thermal energy loss to the supporting substrate and convective heat transfer in the surrounding liquid. This study provides a straightforward approach for producing vapor bubbles with tunable nucleation dynamics and offers insights into the detailed nucleation process of photothermal vapor bubbles, holding significant implications for a wide range of applications in micro/nanofluidics.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110099"},"PeriodicalIF":7.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nanomechanical investigation of deformation behavior of π–π stacked helical polymers","authors":"Yuri Jeon ,&nbsp;Byeonghwa Goh ,&nbsp;Joonmyung Choi","doi":"10.1016/j.ijmecsci.2025.110100","DOIUrl":"10.1016/j.ijmecsci.2025.110100","url":null,"abstract":"<div><div>Helical polymers (HPs) have high potential as functional engineering materials according to the emulation of the nature of helix at the nanometer scale. However, there is still a lack of research directly identifying the factors that influence both the structural characteristics of the spiral and the mechanical stiffness of HPs. This study is the first to reveal the effect of the diameter of HPs on changes in the mechanical properties. We constructed three HP models with different diameters but with the same chemical unit. During tensile stretching, the structure of the HP preserves the interlayer distance while tilting diagonally. The diameter of HPs was identified as a key factor in determining structural stability and mechanical stiffness. Microscopic observation of HPs showed that the weakening of the π–π interactions due to the interlayer in-plane slippage ultimately leads to fracture of the structure. The non-bonded potential energy analysis clearly shows the high anisotropy of the deformation modes, namely slip and detachment. In addition, we designed HP models with helical reversal defects to evaluate the weakening effect of HP stiffness. Our results suggest that mechanical stiffness is a promising strategy for modulating the response kinetics of HPs from an engineering design perspective. In conclusion, this study provides a theoretical basis for designing the mechanical stiffness of HPs suitable for specific applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110100"},"PeriodicalIF":7.1,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms of FRAM toolhead enhancing material flow and grain refinement","authors":"Yiyang Liu ,&nbsp;Haibin Liu ,&nbsp;Ruishan Xie ,&nbsp;Ying Chen ,&nbsp;Shujun Chen","doi":"10.1016/j.ijmecsci.2025.110097","DOIUrl":"10.1016/j.ijmecsci.2025.110097","url":null,"abstract":"<div><div>Friction-rolling additive manufacturing (FRAM) is a solid-phase additive manufacturing technique that relies on tool-driven material deposition and interlayer bonding. However, the interfacial bonding and formation mechanisms induced by toolhead features are unclear. In this study, a three-dimensional thermomechanical coupled Eulerian–Lagrangian (CEL) model was developed by incorporating a damage constitutive model that reflected the friction between various toolhead features and the damaged material. This study systematically investigated the heat generation and material flow behavior around the toolhead with different features and evaluated their effects on the interfacial bonding and microstructure. The results showed that the groove feature enhanced material disruption in the forward region of the toolhead, thereby reducing the heat generated by friction and accelerating the overall accumulation of plastic deformation. This significantly increased the material capture ability and plasticized zone range. The material flow is influenced by the combined effects of shearing and extrusion around the toolhead, which subsequently affects the interface morphology. The groove features promote upward migration on the substrate surface, forming a mechanical interlocking structure at the interface. In addition, the groove features significantly enhanced recrystallization in the deposition layer, achieving a grain refinement of up to 80% of the base material size. These findings reveal the interaction mechanisms between toolheads and materials, which offer further insights into toolhead design and optimization.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110097"},"PeriodicalIF":7.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic characteristics of granular beds subjected to projectile impact","authors":"Chun-Chung Liao ,&nbsp;Mu-Ho Lin ,&nbsp;Yun-Chi Chung ,&nbsp;Chia-Chin Hsu","doi":"10.1016/j.ijmecsci.2025.110096","DOIUrl":"10.1016/j.ijmecsci.2025.110096","url":null,"abstract":"<div><div>The study aims to investigate the internal dynamic characteristics of granular beds subjected to projectile impact. To facilitate this, a novel, cost-effective, and easily implementable experimental setup was designed for drop tests involving a spherical projectile impacting a 3D granular bed. This setup enables precise measurement of both translational and angular motion of the projectile within 3D granular systems. A 3D discrete element method (DEM) model was employed to simulate these impact events and validated through comparison with physical experiments. Key physical properties included the penetration depth, translational and angular velocities, translational and angular accelerations of the projectile, and the surface velocity field of the granular bed. The adopted DEM model demonstrated good agreement with the experimental observation. The validated DEM model was then used to further explore the internal dynamic characteristics of the granular bed during impact. The solid volume fraction of the granular bed is partially affected by the impact process, particularly in the region surrounding the projectile. However, the coordination number and mobilized friction are influenced throughout the entire granular bed. Vertical normal stresses dominate during impact, with contact forces displaying isotropic distribution in the horizontal plane, but anisotropic distribution in the vertical plane. The impact of the projectile significantly enhances the mobilization of the inter-bead and bead-wall friction. The probability distributions of inter-bead normal and tangential contact forces exhibit distinct patterns between the end of filling and the projectile impact: a linear curve and a decaying exponential curve on a semi-logarithmic plot, respectively. The velocity of the longitudinal wave is dependent on both bead size and granular porosity, whereas the shear wave velocity is only influenced by the bead size. Interestingly, the ratio of longitudinal wave velocity to shear wave velocity remains approximately constant during impact.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110096"},"PeriodicalIF":7.1,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transfer learning-enhanced finite element-integrated neural networks","authors":"Ning Zhang ,&nbsp;Kunpeng Xu ,&nbsp;Zhen-Yu Yin ,&nbsp;Kai-Qi Li","doi":"10.1016/j.ijmecsci.2025.110075","DOIUrl":"10.1016/j.ijmecsci.2025.110075","url":null,"abstract":"<div><div>Physics informed neural networks (PINNs) have attracted increasing attention in computational solid mechanics due to their success in solving complex partial differential equations (PDEs). Nevertheless, the low efficiency and precision always hinder the application of PINNs in boundary value problems. To address this issue, this study proposed a transfer learning enhanced hybrid framework that integrates the finite element method with PINNs to accelerate the training process. The finite element-integrated neural network framework (FEINN) is first introduced, leveraging finite elements for domain discretization and the weak-form governing equation for defining the loss function. A mesh parametric study is subsequently conducted, aiming to identify the optimal discretization configuration by exploring various element sizes, element types, and orders of shape functions. Furthermore, various transfer learning strategies are proposed and fully evaluated to improve the training efficiency and precision of FEINN, including scale transfer learnings (STLs) from coarse mesh to refine mesh and from small domain to large domain, material transfer learnings (MTLs) from elastic material to elastoplastic material and from elastic material to elastic material problems, as well as load transfer learnings (LTLs) form displacement load condition to force load condition. A series of experiments are conducted to showcase the effectiveness of FEINN, identifying the most efficient discretization configuration and validating the efficacy of transfer learning strategies across elastic, elastoplastic, and multi-material scenarios. The results indicate that the element type and size, and shape function order have significant impacts on training efficiency and accuracy. Moreover, the transfer learning techniques can significantly improve the accuracy and training efficiency of FEINN.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"290 ","pages":"Article 110075"},"PeriodicalIF":7.1,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}