Mechanics of Materials最新文献_第10页

Higher-order indentation model based on mixture unified gradient with surface elasticity: A theoretical study 基于混合统一梯度和表面弹性的高阶压痕模型的理论研究

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-18 DOI: 10.1016/j.mechmat.2025.105298

Chuan He , Yuanming Lai , Enlong Liu , Siming He , Jianhai Zhang , Yunming Yang

{"title":"Higher-order indentation model based on mixture unified gradient with surface elasticity: A theoretical study","authors":"Chuan He , Yuanming Lai , Enlong Liu , Siming He , Jianhai Zhang , Yunming Yang","doi":"10.1016/j.mechmat.2025.105298","DOIUrl":"10.1016/j.mechmat.2025.105298","url":null,"abstract":"<div><div>This study proposes a higher-order framework for half-space indentation based on mixture unified gradient theory (MUGT) with surface elasticity (SE). MUGT, a well-posed theory that captures both nonlocal and strain gradient properties, is essential for understanding size effects in nano/micro-scale materials and structures. However, indentation problems considering MUGT remain unexplored. We develop efficient analytical and numerical methods to address the problem. In the 3D context, the stress components are analytically determined using 2D Fourier transform applied to constitutive relations that incorporate stress gradient elasticity. Regarding the contact pressure, the problem results in integral equations whose kernel is challenging to obtain explicitly. These are numerically solved using the sum of independent functions, rather than relying on discrete point values as done in previous studies on singular integral equations. Our findings demonstrate that stress gradient elasticity leads to greater surface vertical displacement, whereas strain gradient and surface elasticity result in smaller surface vertical displacement, highlighting the softening and hardening behaviors respectively. Drastically different contact pressure distributions and surface vertical displacements can be obtained compared to existing theories. Particularly, both hardening and softening of size-dependent indentation hardness are intrinsically captured, aligning with available experimental observations. These behaviors, however, are challenging to simultaneously reflect in existing indentation theories due to the exclusion of stress gradient elasticity. The study enhances the understanding of contact mechanics and is of practically significance for nano/micro-scale materials and structures.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"204 ","pages":"Article 105298"},"PeriodicalIF":3.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact response of pearlitic steel dominated by ferrite/cementite interface 以铁素体/渗碳体界面为主的珠光体钢的冲击响应

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-17 DOI: 10.1016/j.mechmat.2025.105300

Jun Wang , Ziwei Ma , Gan Ding , Rong Yang , Songlin Cai , Lanhong Dai , Chunsheng Lu , Minqiang Jiang

引用次数: 0

A concurrent multiscale simulation for nonlinear flexural and postbuckling analyses of single-layer graphene sheets at finite temperature 有限温度下单层石墨烯片非线性屈曲和后屈曲分析的并行多尺度模拟

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-17 DOI: 10.1016/j.mechmat.2025.105297

Akash Raikwar, Sandeep Singh

{"title":"A concurrent multiscale simulation for nonlinear flexural and postbuckling analyses of single-layer graphene sheets at finite temperature","authors":"Akash Raikwar, Sandeep Singh","doi":"10.1016/j.mechmat.2025.105297","DOIUrl":"10.1016/j.mechmat.2025.105297","url":null,"abstract":"<div><div>A computationally efficient numerical simulations based on an atomistic-continuum coupling in conjunction with a finite element model are presented for the static response of graphene sheets under transverse and in-plane compressive loads at finite temperatures. The present multiscale approach incorporates the dihedral energy terms in atomic interactions based on Tersoff-Brenner potential and Green-Lagrange nonlinearity through strain displacement relations. The atomic level deformations (bond lengths, bond angles and dihedral angles) are coupled to continuum scale through the quadratic-type Cauchy Born rule. The governing equations at continuum scale are solved through finite element method. The separate subroutine is developed to calculate stress/moments resultants, and the tangent constitutive matrix is embedded in the Gauss-quadrature numerical integration of the elemental equations. The influence of dihedral energy term and finite temperature on the linear and nonlinear bending response and postbuckling analyses of graphene sheets is investigated in detail. In addition, a new set of empirical parameters proposed by authors in their earlier work has also been examined for the nonlinear response of graphene sheets.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"205 ","pages":"Article 105297"},"PeriodicalIF":3.4,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Necessary conditions for stable equilibrium states of lattice solids based on the Cosserat elasticity theory 基于Cosserat弹性理论的晶格固体稳定平衡态的必要条件

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-17 DOI: 10.1016/j.mechmat.2025.105292

Milad Shirani , Mircea Bîrsan

引用次数: 0

Modeling of shock-induced plasticity of single-crystalline magnesium with a coupled dislocation and twinning constitutive model 用位错-孪晶耦合本构模型模拟单晶镁的冲击塑性

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-16 DOI: 10.1016/j.mechmat.2025.105296

Sui Jia , Hao Zhang , Jidong Yu , Xiaoyang Pei , Songlin Yao , Qiang Wu

{"title":"Modeling of shock-induced plasticity of single-crystalline magnesium with a coupled dislocation and twinning constitutive model","authors":"Sui Jia , Hao Zhang , Jidong Yu , Xiaoyang Pei , Songlin Yao , Qiang Wu","doi":"10.1016/j.mechmat.2025.105296","DOIUrl":"10.1016/j.mechmat.2025.105296","url":null,"abstract":"<div><div>Despite significant attention over recent decades, the dynamic plasticity of magnesium (Mg) under high pressure and high strain rates remains far from well understood owing to the complexity of deformation under such extreme conditions. In particular, dynamic twinning plasticity is still described by phenomenological models, which limits further understanding of the dynamic mechanical response of metals. In this work, a twinning substructure model, in which twinning nucleation, propagation, and growth are taken into account, is applied to address plastic deformation of single-crystalline Mg subjected to shock compression. The model is coupled with a dislocation plasticity model under the thermoelastic–viscoplastic framework. By utilizing this combined model, a quantitative connection between the evolution of defects, including dislocations and twins, and the experimentally measured wave profiles is established. Modeling the mechanical response of single-crystalline Mg under shock compression provides new insights into the twinning-related plasticity of Mg, revealing that the typical features of the wave profile of Mg are significantly influenced by twinning, especially those along the (10–10) direction. Notably, in contrast to the classical understanding predicted by the dislocation plasticity model that deformation on the elastic precursor wavefront is purely one-dimensional elastic, the new model indicates that twinning nucleation leads to considerable plastic deformation on the elastic precursor wavefront. Additionally, plasticity along the (10–10) direction at the plastic front is demonstrated to be governed by twinning and dislocation mechanisms acting together, while the power-scaling law appears to be almost independent of the twinning mechanisms.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"204 ","pages":"Article 105296"},"PeriodicalIF":3.4,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic effective properties of piezoelectric composites with inclusions in arbitrary orientations 含任意取向夹杂的压电复合材料动态有效性能研究

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-12 DOI: 10.1016/j.mechmat.2025.105293

Yanpeng Yue , Yongping Wan , Zheng Zhong

引用次数: 0

Modelling and finite element simulation of martensite and bainite phase transformations during quenching under consideration of carbon repartitioning 考虑碳重分配的淬火马氏体和贝氏体相变的建模和有限元模拟

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-08 DOI: 10.1016/j.mechmat.2025.105275

Tim Furlan , Markus Schewe , Philipp Scherm , Philipp Retzl , Ernst Kozeschnik , Andreas Menzel

{"title":"Modelling and finite element simulation of martensite and bainite phase transformations during quenching under consideration of carbon repartitioning","authors":"Tim Furlan , Markus Schewe , Philipp Scherm , Philipp Retzl , Ernst Kozeschnik , Andreas Menzel","doi":"10.1016/j.mechmat.2025.105275","DOIUrl":"10.1016/j.mechmat.2025.105275","url":null,"abstract":"<div><div>Control of the microstructure of steel components during their processing is a crucial factor for reaching desired product properties. Realistic simulations of the microstructure evolution during processing can facilitate the improvement of existing processes as well as the design of new ones by reducing the need for time- and cost-intensive experimental investigations. This work focuses on the modelling and advanced simulation of quenching of components made of the high-carbon bearing steels 100Cr6 and 100CrMnSi6-4, during which transformations from austenite to martensite and bainite are considered. Special attention is given to the carbon-enrichment of the austenite phase during the formation of carbide-free bainite, since the change in carbon content also changes the martensite start temperature. A novel model based on the widely used Koistinen–Marburger and Johnson–Mehl–Avrami–Kolmogorov models is proposed, which explicitly takes into account the carbon contents of the remaining austenite and its influence on the kinetics of both transformations. The proposed model is implemented as a user material for the commercial finite element software Abaqus. Our source code and calibration data are available at <span><span>https://github.com/InstituteOfMechanics/Phase_Trafos_Carbon_Repartitioning</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"204 ","pages":"Article 105275"},"PeriodicalIF":3.4,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plastic behavior of additively manufactured Ti6Al4V ELI: Mechanical characterization, engineering scale modeling, and validation using free-end torsion tests 增材制造Ti6Al4V ELI的塑性行为：机械表征，工程规模建模，并使用自由端扭转试验验证

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-07 DOI: 10.1016/j.mechmat.2025.105291

Luca Corallo , Oana Cazacu , Raffaele Barbagallo , Giuseppe Mirone

{"title":"Plastic behavior of additively manufactured Ti6Al4V ELI: Mechanical characterization, engineering scale modeling, and validation using free-end torsion tests","authors":"Luca Corallo , Oana Cazacu , Raffaele Barbagallo , Giuseppe Mirone","doi":"10.1016/j.mechmat.2025.105291","DOIUrl":"10.1016/j.mechmat.2025.105291","url":null,"abstract":"<div><div>This paper is devoted to the study of Ti6Al4V ELI (Extra Low Interstitials) processed by electron beam melting (EBM). The experimental investigation includes quasi-static uniaxial tension and compression tests and free-end torsion tests. It was found that the horizontally and vertically printed specimens have the same yield stresses and similar overall stress-strain response. Irrespective of the printing direction the material displays strength differential effects. During monotonic compression tests, a slight anisotropy in plastic strains in compression was revealed by online optical measurements. This slight anisotropy was confirmed by conducting interrupted compression tests and further measuring the deformed cross-sections. Although the material anisotropy is weak, the torsional response cannot be captured with the von Mises yield function. On the other hand, using the isotropic Cazacu and Barlat (2004) yield function that involves only one additional parameter that can be determined solely from uniaxial tension and compression tests, both strength differential effects and the material's torsional response are predicted with accuracy. Furthermore, a transversely isotropic extension of this yield criterion involving only two additional anisotropy coefficients that can be determined using analytical formulas from uniaxial data, enables to account for both the mild anisotropy and the material's tension compression asymmetry and to obtain good predictions for all test conditions investigated.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105291"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effective strain in simple shear deformation considering material anisotropy 考虑材料各向异性的简单剪切变形有效应变

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-07 DOI: 10.1016/j.mechmat.2025.105290

Kanghwan Ahn

{"title":"Effective strain in simple shear deformation considering material anisotropy","authors":"Kanghwan Ahn","doi":"10.1016/j.mechmat.2025.105290","DOIUrl":"10.1016/j.mechmat.2025.105290","url":null,"abstract":"<div><div>The effective strain in simple shear was explored with material anisotropy by providing its mathematical expression. Based on large deformation theory, the kinematics of simple shear was analyzed with discretization of the deformation process and decomposition of the deformation gradient, from which expressions that can be practically utilized for evaluating effective strain were derived for simple shear. Material anisotropy was considered by using the quadratic anisotropic yield function with Lankford values. It was found that the effective strain in simple shear can be accurately estimated as the number of the discretized deformation steps approaches infinity. It was verified that the derived expression can also be obtained from other approaches based on the co-rotational rate of deformation tensor and the plastic work equivalence, respectively. To demonstrate its application, the effective strains of several anisotropic metals made of steel alloys and aluminum alloys were evaluated using the developed expression. It was found that the effective strain of the extruded aluminum profile differs significantly from those of the other metals due to its strong planar anisotropy. This result demonstrates that the effective strain in simple shear can be significantly influenced by material anisotropy. Further investigations were conducted on the evaluation of effective strain in cases where simple shear is approximated by a finite number of increments, deriving relevant expressions for effective strain. Effective strains calculated from these expressions showed good correlations with those obtained from the incremental computations using the commercial finite element software Abaqus/Standard.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"205 ","pages":"Article 105290"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constitutive modeling of diffusion-limited oxidation coupled with a large deformation theory for polymer degradation 扩散限制氧化的本构建模与聚合物降解的大变形理论

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2025-02-07 DOI: 10.1016/j.mechmat.2025.105270

Hossein Naderi, Roozbeh Dargazany

{"title":"Constitutive modeling of diffusion-limited oxidation coupled with a large deformation theory for polymer degradation","authors":"Hossein Naderi, Roozbeh Dargazany","doi":"10.1016/j.mechmat.2025.105270","DOIUrl":"10.1016/j.mechmat.2025.105270","url":null,"abstract":"<div><div>The influence of oxidation on the degradation of polymers is one of the most critical aging processes. The oxidation is usually limited to the sample’s surface, commonly called diffusion-limited oxidation (DLO). DLO occurs through the competition of simultaneous oxygen absorption, diffusion transport, and the reaction of oxygen in the elastomers. A new kinetics-based oxygen absorption model is developed and validated against multiple experimental data. In addition, the diffusion-reaction equation is extended in 3 dimensions and solved by the Alternating Direction Implicit (ADI) method. Various reaction rate functions are considered for chain scission and network reformation reactions to describe non-uniform degradation. An enhanced model is utilized to simulate the heterogeneous oxidation and to demonstrate the influence of contributing factors on the oxidation behavior of nitrite rubber. Our proposed model’s results agree with the empirical data on polymers’ oxidation degree. In addition, a constitutive model is developed that incorporates the coupling between diffusion, chemical reaction, and large deformation of polymers. The finite element implementation of the coupled multi-physics is explained in detail. The proposed constitutive model illustrates the effect of diffusion-limited oxidation (DLO) on the mechanical properties of cross-linked polymers. It numerically analyzes the coupled diffusion–reaction and mechanical behavior of polymers undergoing DLO.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105270"},"PeriodicalIF":3.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0