European Journal of Mechanics A-Solids最新文献

{"title":"Micromechanobiology: A micromechanics approach to mechanobiology","authors":"Patrick R. Onck,&nbsp;Erik Van der Giessen","doi":"10.1016/j.euromechsol.2025.105893","DOIUrl":"10.1016/j.euromechsol.2025.105893","url":null,"abstract":"<div><div>The thrust of this article is to postulate a possible route along the micro-meso-macro lines of micromechanics to contribute to the vibrant field of mechanobiology. In particular, we focus on mechanotransduction: the machinery by which cells adapt to their environment and how its failure is key to many diseases, including cancer. Starting out from the geometrical similarity with open-cell foams, for which the micro-meso-macro transition is well developed, this paper summarizes the current understanding of the mechanical behavior of biopolymer networks as central entities in mechanotransduction. More specifically, we address the dynamics of molecular networks in the nuclear membrane, filamentous networks in the cytoskeleton, as well as networks making up the extracellular matrix. We emphasize that the enhanced richness in behavior of these networks originates from the relatively large contribution of entropy. We also identify a number of challenges arising from the fact that the materials involved are intrinsically dynamic and active. The development of tools needed to address these challenges has just started and thus offers a bright future for current and new generations of micromechanicians.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105893"},"PeriodicalIF":4.2,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220665","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 and stochastic dynamic response of functionally graded graphene platelet-reinforced composite cabin assemblages","authors":"Zhengyang Gao,&nbsp;Yucheng Lei,&nbsp;Xianjie Shi,&nbsp;Zhou Huang","doi":"10.1016/j.euromechsol.2025.105896","DOIUrl":"10.1016/j.euromechsol.2025.105896","url":null,"abstract":"<div><div>The pursuit of higher performance and lighter weight in aircraft design poses critical challenges to cabin structures, particularly from stationary and non-stationary stochastic excitations during service, which threaten vibration resistance. However, existing studies are predominantly limited to the deterministic or stationary vibration of single composite shells. A significant gap exists in the development of unified dynamic models for functionally graded graphene platelet-reinforced composite (FG-GPLRC) cabin assemblages, particularly for analyzing their non-stationary responses. This gap hinders reliable engineering design. This study conducts dynamic modeling and characteristic analysis of FG-GPLRC cabin assemblages. In this study, the material properties of each layer were first determined using the Halpin-Tsai model and the rule of mixtures. Subsequently, a unified dynamic model for the combined shell structures was developed based on the first-order shear deformation theory (FSDT), the spectro-geometric method (SGM), and the pseudo-excitation method (PEM). The interactions between adjacent shells were simulated with elastic couplers, whose potential energy was formulated based on displacement continuity and force balance conditions. The final model, established by incorporating the work done by external loads and the energy of boundary constraint springs, was validated through convergence studies and comparisons with finite element method (FEM) results. The free vibration and stationary/nonstationary stochastic dynamic characteristics of the assemblages were thoroughly investigated. The results elucidate the dynamic behaviour of FG-GPLRC cabin assemblages and provide a theoretical foundation for the vibration-resistant design of aircraft cabins.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105896"},"PeriodicalIF":4.2,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267107","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":"Mechanistic insights into the strength–toughness synergy of nano-laminated structure: Role of stacking configurations","authors":"Yong Zhang ,&nbsp;Xin-Ting Li ,&nbsp;Chen-Yun He,&nbsp;Yu Lai,&nbsp;Yun-Fei Jia","doi":"10.1016/j.euromechsol.2025.105895","DOIUrl":"10.1016/j.euromechsol.2025.105895","url":null,"abstract":"<div><div>Nano-laminated structures have gained significant attention in the design of metallic materials due to their excellent strength-toughness synergy. However, the underlying deformation and failure mechanisms—as well as the quantitative influence of structural parameters on these processes—remain insufficiently understood, hindering the rational design and optimization of nano-laminated architectures. In this study, large-scale molecular dynamics (MD) simulations involving tens of millions of atoms were employed to investigate the mechanical response of nano-laminated structures with varying overlap ratios under uniaxial tension. Compared to equiaxed grain structures, the nano-laminated configurations exhibit enhanced strength, primarily due to improved grain boundary stability. While the overlap ratio has little effect on strength, it positively influences fracture elongation and energy. The LM-50 % structure (nano-laminated structure with a 50 % overlap ratio) achieves the best balance between strength and toughness. This performance is attributed to synergistic mechanisms, including stress homogenization, crack blunting, and the activation of multiple microcracks that reduce the stress intensity factor and promote an alternating transgranular and intergranular failure path. Furthermore, the emergence of 9R stacking fault structures contributes to local stress relief and suppresses crack-tip stress concentration, enhancing overall fracture resistance. These findings provide atomistic-level insights into stacking-controlled deformation and offer design guidelines for the development of high-strength, damage-tolerant nano-laminated materials.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105895"},"PeriodicalIF":4.2,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220663","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":"Effect of post-treatments on the microstructural and fatigue properties of Ti6Al4V-ELI alloy fabricated by laser powder bed fusion method","authors":"Gürkan Kaya ,&nbsp;Fatih Yıldız ,&nbsp;Fatih Güler","doi":"10.1016/j.euromechsol.2025.105885","DOIUrl":"10.1016/j.euromechsol.2025.105885","url":null,"abstract":"<div><div>The Laser Powder Bed Fusion method is a modern production technology that allows products with complex geometry to be produced. In parts produced with this method, surface roughness and defects such as voids and unmelted powders in the internal structure negatively affect the fatigue life of the part. Post-treatments are often needed to optimize the microstructure and obtain the required fatigue properties. This study examined how the mechanical properties were affected by heat treatment (HT) conducted both below and above the <span><math><mi>β</mi></math></span> transformation temperature. The effects of HIP and electropolishing (EP) processes applied to Ti6Al4V-ELI alloys on fatigue behavior were examined. Residual stress values of untreated and post-treated samples were measured, and the results were interpreted. A significant decrease of approximately 10 times in the surface roughness values of fatigue samples was detected with the electropolishing process. The fatigue limit of the as-built (AB) samples was 150 MPa. After applying HT1+EP and HIP+EP post-treatments to the AB samples, the fatigue limit increased by approximately 3.6 and 3.9 times, respectively, compared to the untreated AB condition. Considering the fact that the fatigue limit values between the two groups are not very different and the high cost of the HIP process, it was evaluated that the HT1+EP process may be a more suitable post-treatment in terms of fatigue performance of additively manufactured parts.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105885"},"PeriodicalIF":4.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158677","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":"Cohesion moduli and higher-order elastic constants of fcc metals in the framework of anisotropic second strain-gradient theory","authors":"V. Bagherpour,&nbsp;M.R. Delfani","doi":"10.1016/j.euromechsol.2025.105884","DOIUrl":"10.1016/j.euromechsol.2025.105884","url":null,"abstract":"<div><div>An anisotropic second strain-gradient theory can incorporate the structural asymmetry of crystalline solids into the description of the higher-order fluctuations in the elastic fields induced therein in response to mechanical loading. Such a theory is thus expected to provide a continuum-level description sufficiently close to the physical reality of solids. The price to be paid in return for this level of accuracy is the large number of elastic constants involved in this theory. Using the numerical values reported in a recently published paper [Bagherpour, V., &amp; Delfani, M. R. (2024). <em>Eur. J. Mech. A/Solids</em>, 107:105377] for the characteristic lengths of a set of fcc metals within the framework of this theory, the numerical values of all their higher-order elastic constants and cohesion moduli are determined in this study. The determination of such elastic constants and cohesion moduli requires the simulation of the free-surface-induced reconstruction and shear loading of thin layers made of the fcc metals, which are carried out in this paper using the embedded-atom method. The results of these simulations are then compared to the corresponding analytical solutions, and the desired material parameters are calculated. Furthermore, the conditions for the positive definiteness of the strain-energy-density function involved in the adopted theory are derived, and subsequently it is discussed whether the elastic constants numerically determined herein for the fcc metals satisfy such conditions.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105884"},"PeriodicalIF":4.2,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158676","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":"Edge effects in adhesive and non-adhesive indentation: Experimental and numerical insights","authors":"Qiang Li ,&nbsp;Sen Jiang ,&nbsp;Valentin L. Popov","doi":"10.1016/j.euromechsol.2025.105891","DOIUrl":"10.1016/j.euromechsol.2025.105891","url":null,"abstract":"<div><div>The indentation test of a steel indenter on soft rubber is conducted with a focus on investigating how the indenter location influences the contact behavior. It is observed that when the indenter is positioned close to the edge of the rubber block, the shape of the contact area becomes noncircular, and the normal force required to indent the rubber to the same depth is smaller compared to the case when the indenter is farther from the edge. To explore the effect of edge in adhesive contact, a sticky rubber with a lower elastic modulus is used. The adhesive contact behavior exhibits a distinct peak in adhesive force at an intermediate distance from the edge, after which the adhesive force decreases as the indenter moves farther from the edge. Numerical simulations are performed to discuss the mechanisms behind the observed adhesion enhancement. These simulations suggest that the asymmetry in the contact area and the pinning effect at the edge play a significant role in increasing the adhesive force.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105891"},"PeriodicalIF":4.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158680","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":"Complex nonlinear dynamical behaviors of the mechanical vibration system for the cantilever wing plate with variable cross-section: Experiment and theory","authors":"Y.Z. Lian ,&nbsp;W. Zhang ,&nbsp;Y.H. Wang ,&nbsp;Y. Wang ,&nbsp;Y. Jiang","doi":"10.1016/j.euromechsol.2025.105888","DOIUrl":"10.1016/j.euromechsol.2025.105888","url":null,"abstract":"<div><div>For the nonlinear dynamic characteristics of aircraft structures, the idealized models are often used to simplify the actual structure to reduce the complexity of the analysis and highlight the key response characteristics. The wing is usually modeled as a variable-section wing plate with cantilever boundary conditions, which effectively studied primary structural behaviors in nonlinear vibration. Considering the graphene-reinforced materials, we investigate the complex nonlinear dynamic behaviors of the cantilever wing plate with variable cross-section by using the experiments and theory. The nonlinear vibrational behaviors include the threshold surface, resonance responses, global bifurcations and double-parameter multi-pulse chaotic motions for the system subjected to the parametric and transverse excitations. The vibrational test experiments for the cantilever variable cross section plate are conducted before the theoretical investigation, which the results certify the existence of the complex dynamical behaviors for the mechanical vibration system. For the vibrational theory study of the variable-section wing plate with cantilever boundary conditions, considering the primary resonances, 1/2 sub-harmonic parametric resonances, and the 1:1 internal resonance, the averaged equations for the cantilever variable cross section wing plate are obtained through the multiple scale perturbation (MSP) method. The amplitude-frequency and force-amplitude response curves are depicted to examine the resonant responses. The extended Melnikov method is utilized to evaluate the threshold surface, global bifurcations and double-parameter multi-pulse chaotic dynamics for the system subjected to the parametric and transverse excitations. In the case of the simultaneous resonances, the system exhibits the classical nonlinear hard spring characteristics and two resonance peaks. Under larger parametric or transverse excitations, the nonlinear behavior of the first-order modes for the system becomes more pronounced, resulting in larger resonance peaks. In addition, multi-pulse homoclinic orbits emerge in the system, leading to double-parameter multi-pulse chaotic vibration characteristics under combined the parametric and transverse excitations. Alternating periodic and double-parameter multi-pulse chaotic motions appear for the system in the influence of the parametric and transverse excitations.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105888"},"PeriodicalIF":4.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145158683","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 metamaterials by second-order rate-type constitutive relations between only the macroscopic stress and strain","authors":"Vít Průša ,&nbsp;Casey Rodriguez ,&nbsp;Ladislav Trnka ,&nbsp;Martin Vejvoda","doi":"10.1016/j.euromechsol.2025.105879","DOIUrl":"10.1016/j.euromechsol.2025.105879","url":null,"abstract":"<div><div>We propose a thermodynamically based approach for constructing effective rate-type constitutive relations describing finite deformations of metamaterials. The effective constitutive relations are formulated as <em>second-order</em> in time rate-type Eulerian constitutive relations between only the Cauchy stress tensor, the Hencky strain tensor and objective time derivatives thereof. In particular, there is no need to introduce additional quantities or concepts such as “micro-level deformation”,“micromorphic continua”, “enriched continua”, or elastic solids with frequency dependent material properties. The linearisation of the proposed fully nonlinear (finite deformations) constitutive relations leads, in Fourier space, to the same constitutive relations as those commonly used in theories based on the concepts of frequency dependent density and/or stiffness. From this perspective the proposed constitutive relations reproduce the behaviour predicted by the frequency dependent density and/or stiffness models, but yet they work with constant — that is motion independent — material properties. Finally, we argue that the proposed fully nonlinear (finite deformations) second-order in time rate-type constitutive relations do not fall into traditional classes of models for elastic solids (hyperelastic solids/Green elastic solids, first-order in time hypoelastic solids), and that the proposed constitutive relations embody a <em>new</em> class of constitutive relations characterising elastic solids.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105879"},"PeriodicalIF":4.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220662","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":"Prediction model of dynamic fracture toughness of nickel-based alloys: combination of data-driven and multi-scale modelling","authors":"Lusheng Wang ,&nbsp;Liang Shen ,&nbsp;Junhao Yi ,&nbsp;Xin Yang ,&nbsp;Yanhong Peng ,&nbsp;Jun Ding ,&nbsp;Yu Tian ,&nbsp;Siliang Yan","doi":"10.1016/j.euromechsol.2025.105892","DOIUrl":"10.1016/j.euromechsol.2025.105892","url":null,"abstract":"<div><div>The dynamic fracture toughness of nickel-based alloys is closely related to both the internal strengthening phases and external impact loads. However, the prediction of fracture toughness is challenging due to complex factors such as multi-scale effects, non-linearity, and strong correlations. To address these challenges, a novel prediction method for the dynamic fracture toughness of nickel-based alloys has been proposed, which integrates multi-scale numerical simulations (physical models) with machine learning techniques. This method considers both external factors (impact velocity) and internal factors (the size and distribution of strengthening phases).The study analyzes the correlation between impact velocity, the size and distribution of strengthening phases, and dynamic fracture toughness. It also proposes an optimization strategy for the hidden layer depth and the number of neurons in the neural network, resulting in an optimal network structure (8 layers with 25 neurons per layer) for predicting dynamic fracture toughness. Based on this optimized network structure, the study identifies the optimal sample size (<em>N</em> = 90) for ensuring a balance between computational efficiency and prediction accuracy in the fracture toughness model. Furthermore, a comparative analysis is conducted on the fitting and prediction performance of various machine learning models, including artificial neural networks (ANN), support vector machines (SVM), k-nearest neighbors (KNN), and decision trees (DT). Among these, the ANN model demonstrates the best performance, with an average absolute error of 6.73 and a coefficient of determination (R²) of 0.98. Additional validation confirms the model's excellent capability for both interpolation and extrapolation.This research successfully achieves accurate predictions of the dynamic fracture toughness of nickel-based alloys, incorporating physical information transfer. It provides new insights for the design and service performance optimization of nickel-based alloy materials.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105892"},"PeriodicalIF":4.2,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220658","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":"Influence of shell thickness and lattice infill on the mechanical performance of a biomimetic alligator mandible structure","authors":"Joshua Rodrigues ,&nbsp;Raj Das ,&nbsp;Wayne Foster ,&nbsp;Matthew Pelosi ,&nbsp;Simon Barter","doi":"10.1016/j.euromechsol.2025.105887","DOIUrl":"10.1016/j.euromechsol.2025.105887","url":null,"abstract":"<div><div>Biomimetic designs that draw inspiration from structures found in nature provide a unique approach to engineering solutions and can reveal innovative concepts. The use of hollow-walled designs with porous infill provides an opportunity to achieve highly efficient structural designs. However, the experimental application of using hollow-walled designs as an approach to increase the efficiency of biomimetic structures is yet to be explored. This paper hence investigates the influence of shell thickness and lattice infill on the mechanical performance of a biomimetic structure using the example of an alligator mandible. Experimental and numerical approaches were employed to assess the mechanical properties of additively manufactured mandible structures under bending and compressive loading conditions. Finite element simulations were validated against mechanical testing and quantitative thermoelastic stress analysis (TSA). The shell thickness of the mandible was found to be more critical to the specific bending and compressive stiffness of the structure compared to the inclusion of the lattice infill. The TSA scans quantified the effect of shell thickness and infill on the unique surface stress distribution of the mandible, which increased with a reduction in shell thickness. These findings highlight the potential of hollow-walled designs as an approach to create more efficient, and optimised, biomimetic structures. This methodology can be applied to alligator mandible-like designs for load-bearing engineering applications that involve complex loading conditions, such as cantilevered bracket structures.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"116 ","pages":"Article 105887"},"PeriodicalIF":4.2,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220660","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}