European Journal of Mechanics A-Solids最新文献

{"title":"Schwarzite-inspired hybrid cellular structures for energy absorption applications","authors":"V. Udaysankar ,&nbsp;Sudhir Sastry Y.B. ,&nbsp;N. Vu-Bac ,&nbsp;S.R. Mahmoud ,&nbsp;T. Rabczuk ,&nbsp;P.R. Budarapu","doi":"10.1016/j.euromechsol.2025.105775","DOIUrl":"10.1016/j.euromechsol.2025.105775","url":null,"abstract":"<div><div>Inspired by Schwarzites, a novel hybrid cellular structure is proposed for energy absorption applications. The Schwarzite-inspired unit cell is reinforced by introducing a stiffener in its open region, which is further enhanced by incorporating an extruded geometry (referred to as an “extruder”) within the stiffener to maximize energy absorption. Structural optimization is carried out using quasi-static crush analysis, leading to the selection of the optimized unit cell 2 (UC2) for all subsequent studies. The impact resistance of the proposed unit cell is evaluated through bullet impact simulations, targeting pre-selected weak points on a sandwich structure composed of a UC2 core and Aluminum faceplates. This configuration demonstrates resistance to bullet velocities of up to 115 m/s at arbitrary impact locations. Subsequently, the Aluminum faceplates are replaced with carbon fiber reinforced polymer (CFRP) faceplates featuring various ply orientations. The use of CFRP results in a maximum reduction in bullet penetration depth of 17.81%. Among the different configurations, the [0/90/0/90] cross-ply orientation exhibits the least penetration depth and is therefore recommended. Finally, air blast simulations are conducted on sandwich structures incorporating cores made from UC2, bamboo spiderweb (BS), hierarchical honeycomb (HH), and stiffened honeycomb (SH) designs. Among these, the UC2 core exhibits the highest bending stiffness and the lowest back-face deflection, indicating uniform structural stiffness. Consequently, this design eliminates the need for multi-stage layering or strategic core offsetting.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"115 ","pages":"Article 105775"},"PeriodicalIF":4.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686100","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":"Hyperelastic nature of the Hoek–Brown criterion","authors":"I. Fontana ,&nbsp;G. Bacquaert ,&nbsp;D.A. Di Pietro ,&nbsp;K. Kazymyrenko","doi":"10.1016/j.euromechsol.2025.105782","DOIUrl":"10.1016/j.euromechsol.2025.105782","url":null,"abstract":"<div><div>We propose a nonlinear elasto-plastic model, for which a specific class of hyperbolic elasticity arises as a straight consequence of the yield criterion invariance on the plasticity level. We superimpose this nonlinear elastic (or hyperelastic) behavior with plasticity obeying the associated flow rule. Interestingly, we find that a linear yield criterion on the thermodynamical force associated with plasticity results in a quadratic yield criterion in the stress space. This suggests a specific hyperelastic connection between Mohr–Coulomb and Hoek–Brown (or alternatively between Drucker–Prager and Pan–Hudson) yield criteria. We compare the elasto-plastic responses of standard tests for the Drucker–Prager yield criterion using either linear or the suggested hyperbolic elasticity. Notably, the nonlinear case stands out due to dilatancy saturation observed during cyclic loading in the triaxial compression test. We conclude this study with structural finite element simulations that clearly demonstrate the numerical applicability of the proposed model.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"115 ","pages":"Article 105782"},"PeriodicalIF":4.4,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662995","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":"The vibration-collision behavior during the diaphragm's fracture in hypersonic impulse facilities","authors":"Linjie Huang,&nbsp;Jiahao Zhang,&nbsp;Xia Song,&nbsp;Gun Li,&nbsp;Jiang Lai","doi":"10.1016/j.euromechsol.2025.105789","DOIUrl":"10.1016/j.euromechsol.2025.105789","url":null,"abstract":"<div><div>The shock tunnel is essential for investigating the dynamic and thermal characteristics of hypersonic flight. A critical component of this facility is the diaphragm, which serves as a quick-opening valve. The dynamic behavior associated with diaphragm failure is intricate, and the interaction between the diaphragm and the shock tunnel presents a significant nonlinear problem that can damage the facility. Previous research has primarily focused on predicting the burst pressure of the diaphragm, often overlooking the vibration characteristics associated with its failure. This study established a dynamic model based on the Johnson-Cook diaphragm and shock tunnel model. Utilizing this model, we analyzed the vibration and collision behavior and identified four distinct stages of diaphragm failure. Furthermore, we investigated how pressure influences the diaphragm's vibration and collision behavior.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105789"},"PeriodicalIF":4.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653637","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":"Modeling the mechanical behavior of coated masonry elements using surface stress theory","authors":"Simona Di Nino ,&nbsp;Giuseppe Rosi ,&nbsp;Francesco D’Annibale","doi":"10.1016/j.euromechsol.2025.105779","DOIUrl":"10.1016/j.euromechsol.2025.105779","url":null,"abstract":"<div><div>The Gurtin–Murdoch Surface Stress Model (SSM) is employed to model thin coatings of Steel Fiber Reinforced Mortar (SFRM) applied to masonry structures. This approach introduces a non-classical mechanical boundary condition, which expresses in-plane surface traction on the masonry facades in terms of surface stress and inertia. Finite Element (FE) analyses are performed within the elastic regime on coated masonry wall samples, both under static and dynamic loading conditions, to validate the accuracy of the theoretical model. Finally, a more realistic masonry structural system is analyzed to demonstrate the effectiveness of the proposed reinforcement and highlight the computational efficiency of the proposed surface model.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"115 ","pages":"Article 105779"},"PeriodicalIF":4.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662994","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":"Dynamic analysis and design optimization of hemispherical dielectric elastomer generator for efficient energy harvesting","authors":"Aoyu Xiao ,&nbsp;Demin Zhao ,&nbsp;Zewen Gu ,&nbsp;Jianlin Liu ,&nbsp;Fuhao Liu","doi":"10.1016/j.euromechsol.2025.105787","DOIUrl":"10.1016/j.euromechsol.2025.105787","url":null,"abstract":"<div><div>Dielectric elastomer energy generators (DEG), serving as efficient vibration energy harvesters, hold great potential in energy reuse and environmental energy exploitation. This study proposes a hemispherical DEG that employs pre-stretching and out-of-plane expansion deformation mode to achieve high-efficiency energy harvesting. For the proposed DEG, considering the viscoelasticity and electrostriction of DE materials, the study establishes a dynamic model of the hemispherical DEG based on the fractional viscoelastic model and the deformation-dependent electrostriction model. The model is then verified through experiments. Moreover, the influence of excitation parameters and structural parameters on the dynamic response of the proposed system is systematically investigated to better select the appropriate range of design parameters. Based on the established theoretical foundation, this paper leverages deep neural networks (DNN) combined with genetic algorithms (GA) to circumvent the complex dynamic solving process, and establishes a mapping relationship between multiple parameters and the energy output of the hemispherical DEG and seeks design solutions that maximize output power under different energy harvesting environmental conditions. This work provides new insights into the design and modeling of high-performance DEGs, which aids in the design and optimization of DEGs in low-frequency vibration environments.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"115 ","pages":"Article 105787"},"PeriodicalIF":4.4,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662996","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":"Peridynamics modelling on corrosion fatigue behaviours of an iron-based alloy considering mechanochemical effects","authors":"Han Wang ,&nbsp;Kai Huang ,&nbsp;Weizhe Wang ,&nbsp;Licheng Guo","doi":"10.1016/j.euromechsol.2025.105785","DOIUrl":"10.1016/j.euromechsol.2025.105785","url":null,"abstract":"<div><div>The fatigue failure process is significantly accelerated in the presence of corrosion, a phenomenon widely observed in engineering practice. Accurately predicting the corrosion fatigue behaviours of materials remains challenging owing to the limited knowledge of the synergic effects of corrosion and fatigue loads. This paper proposes a new peridynamic simulation method to analyze corrosion fatigue problems based on authors' previous work, which considers mechanochemical effects to exhibit coupling between corrosion and material deformations. To validate the reasonability of the proposed method, corrosion fatigue tests on an iron-based (Fe-based) alloy are conducted to acquire experimental benchmarks. Then, numerical simulations based on the proposed method are conducted, whose results are compared with testing results, also simulation results obtained by previous simulation method. The proposed method not only provides accurate predictions on corrosion fatigue properties (the simulated fatigue limit is 249 MPa, the same with the tested one), but also increases accuracy on lifetime predictions by 66 % compared with authors’ previous work. The proposed method not only provides a unified simulation method in dealing with complex mechanical problems considering both continuity and discontinuity, such as corrosion fatigue, but also provides good accuracy in predictions of corrosion fatigue properties, making such method both theoretical-meaningful and engineering-practical.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105785"},"PeriodicalIF":4.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631108","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":"Nano-architected ceramic aerogels with an engineered seamless shell-based configuration","authors":"Kia Dastani ,&nbsp;Mohammad R. Movahhedy ,&nbsp;Saeed Khodaygan ,&nbsp;Micheal Yu Wang ,&nbsp;Hongyu Yu","doi":"10.1016/j.euromechsol.2025.105781","DOIUrl":"10.1016/j.euromechsol.2025.105781","url":null,"abstract":"<div><div>Traditionally synthesized ceramic aerogels possess a random internal configuration, which leads to poor mechanical properties. One effective strategy to address this issue is through architected design. This research explores a bottom-up synthesis approach to fabricate ceramic aerogels with an engineered internal configuration. The architected design specifically means creating periodic cellular structures with defined unit-cells. In this work, nano-architected ceramic aerogels composed of a 50–200 nm Al₂O₃ film with a relative density of 1.5–6 % are fabricated. A seamless shell-based configuration is employed, diverging from previous works that utilized hollow-tube designs. Due to their slender nature, these nanostructured ceramics are prone to instability failure and are sensitive to manufacturing imperfections. The most critical imperfection in this fabrication process is the geometric deviation between the designed model and the final fabricated structure. This research studies the nature and extent of these geometric deviations and investigates their impact on mechanical performance. The results indicate that the strength of the nano-architected aerogels in this study is significantly higher than that of conventional aerogels and those with hollow-tube designs.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105781"},"PeriodicalIF":4.4,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595792","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":"FG layers' effect on nonlinear free vibrations of sandwich auxetic cylinders","authors":"Farid Mahboubi Nasrekani ,&nbsp;Hamidreza Eipakchi","doi":"10.1016/j.euromechsol.2025.105784","DOIUrl":"10.1016/j.euromechsol.2025.105784","url":null,"abstract":"<div><div>This study develops a novel semi-analytical framework to investigate the nonlinear free vibration behavior of functionally graded (FG) auxetic cylinders, which are increasingly used in aerospace, automotive, and biomedical applications for their potential in weight reduction and enhanced dynamic performance. The cylinder consists of one auxetic core layer and two inner and outer FG layers, with material properties varying continuously through the thickness. Utilizing the First-order Shear Deformation Theory (FSDT) and von Kármán strain relations, a system of four coupled nonlinear partial differential equations is derived using the Hamilton principle, and they are solved using the multiple-scale method for general boundary conditions. The key contributions of this work include: the integration of auxetic behavior and material gradation into a unified nonlinear vibration model, the derivation of a closed-form semi-analytical solution that captures the effects of transverse shear deformation and geometric nonlinearity, and the detailed exploration of frequency-amplitude relationships and nonlinear vibration characteristics. The results offer a valuable tool for designing lightweight and high-performance cylindrical structures with optimized dynamic characteristics. To evaluate the accuracy of the semi-analytical model, the results are compared with other literature results.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105784"},"PeriodicalIF":4.4,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588542","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":"Modeling and 3D simulation of ductile crack growth with non-local Gurson-based formulation","authors":"Thomas Pardoen ,&nbsp;Antonio Kaniadakis ,&nbsp;Van-Dung Nguyen ,&nbsp;Ludovic Noels ,&nbsp;Sara Javangorouh ,&nbsp;Jacques Besson","doi":"10.1016/j.euromechsol.2025.105772","DOIUrl":"10.1016/j.euromechsol.2025.105772","url":null,"abstract":"<div><div>The state of maturity of the micromechanics of ductile fracture is such that it is possible, today, to simulate extensive crack growth in 3D using a sophisticated physics-based description of the mechanisms of nucleation, growth and coalescence of voids within a non-local formulation. Here, different phenomena related to ductile crack growth are addressed in the context of fracture mechanics specimens. Structural integrity assessment of many critical components does indeed rely on predictive models of crack growth from pre-existing sharp defects. Two similar extended Gurson models are used, after comparison to cross-verify their numerical implementation, to generate results about the effect of plate thickness, plastic anisotropy and strain hardening. The variation of the fracture toughness increasing and then decreasing with thickness down to the plane strain regime is captured owing to the 3D nature of the simulations that captures the crack tip necking phenomenon. The non-local formulation introduces a length scale that sets the range over which the fracture toughness depends on thickness. Surprizingly, the thickness effect disappears when using homothetic geometries. The effect of plasticity anisotropy is shown to be particularly important when a crack grows in sheets exhibiting significant crack tip necking by impacting among other the plastic dissipation in the neck. A large strain hardening capacity enhances very much the fracture toughness, an effect that is amplified in 3D when crack tip necking takes place. These findings constitute only a limited set of answers to many remaining questions in the important field of ductile tearing, setting an ambitious roadmap for the years to come to the solid mechanics community. These questions are particularly important in the context of modern technologies such as <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> storage, additive manufacturing, new high strength metallic alloys development, and generation IV nuclear fission and fusion reactors to name a few.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105772"},"PeriodicalIF":4.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611781","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 Transfer Learning method for deep drawing force prediction of sheet metal","authors":"Yingjian Guo ,&nbsp;Gregor Kosec ,&nbsp;Lihua Wang ,&nbsp;Magd Abdel Wahab","doi":"10.1016/j.euromechsol.2025.105780","DOIUrl":"10.1016/j.euromechsol.2025.105780","url":null,"abstract":"<div><div>The deep drawing process involves complex deformations with highly nonlinear interactions among geometry, physics, and boundary conditions. Deep Drawing Force (DDF) refers to the force exerted by the punch on the sheet during forming and is essential for mechanical design and the prediction of failure modes such as wrinkling or fracture. This study proposes a data-driven transfer learning framework to predict DDF under various process conditions, where knowledge learned from analytically generated data is transferred to a model trained on limited numerical or experimental data, effectively reducing the data requirement while maintaining high prediction accuracy. The transfer learning in this work is entirely data-driven and relies on analytically generated data to pre-train a base model. Specifically, a large synthetic dataset is generated for pre-training using theoretical forming force equations based on the energy method. This base model is then fine-tuned using a small number of high-fidelity Finite Element Method (FEM) results that have been experimentally validated, finally, the prediction performance is evaluated by testing on unknown FEM data. The pre-trained knowledge is also transferred to tasks involving parts with different geometries, demonstrating strong generalization capability. Experimental results show that the transfer learning framework significantly improves prediction accuracy while reducing data requirements, offering an efficient and cost-effective solution for deep drawing process modelling.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"114 ","pages":"Article 105780"},"PeriodicalIF":4.4,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605186","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}