Mechanics of Materials最新文献

{"title":"The bending-buckling coupled model for blistering behavior in anti-corrosion coatings","authors":"Liangji Ma ,&nbsp;Yin Yao ,&nbsp;Bo Zhang ,&nbsp;Zhilong Peng ,&nbsp;Shaohua Chen","doi":"10.1016/j.mechmat.2024.105238","DOIUrl":"10.1016/j.mechmat.2024.105238","url":null,"abstract":"<div><div>Anti-corrosion coatings are widely applied in marine engineering and marine equipment. Understanding their blistering failure mechanisms is vital for optimizing coating designs and extending their service life. This paper develops a bending-buckling coupled model and employs the Rayleigh-Ritz method to investigate the axisymmetric circular blister of coatings with initial deflections, with a special focus on the situation where the transverse load is opposite to the deflection. By incorporating the chemo-mechanical coupling, an analytical solution of the critical buckling load in terms of diffusion strain is well achieved, concisely explaining the impacts of transverse loads, initial deflections, and aspect ratios on the critical buckling load. The influence of these parameters on the post-buckling behavior of the coating is further discussed and the contour of the coating blister can be presented. The results should have theoretical guidance significance for predicting and analyzing the service behavior of anti-corrosion coatings.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"203 ","pages":"Article 105238"},"PeriodicalIF":3.4,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160604","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}

{"title":"An additive Mori–Tanaka scheme for elastic–viscoplastic composites based on a modified tangent linearization","authors":"K. Kowalczyk-Gajewska ,&nbsp;S. Berbenni ,&nbsp;S. Mercier","doi":"10.1016/j.mechmat.2024.105191","DOIUrl":"10.1016/j.mechmat.2024.105191","url":null,"abstract":"<div><div>Mean-field modeling based on the Eshelby inclusion problem poses some difficulties when the non-linear Maxwell-type constitutive law is used for elasto–viscoplasticity. One difficulty is that this behavior involves different orders of time differentiation, which leads a long-term memory effect. One of the possible solutions to this problem is the additive interaction law. Generally, mean field models solely use the mean values of stress and strain fields per phase, while variational approaches consider the second moments of stresses and strains. It is seen that the latter approach improves model predictions allowing to account for stress fluctuation within the phases. However, the complexity of the variational formulations still makes them difficult to apply in the large scale finite element calculations and for non-proportional loadings. Thus, there is a need to include the second moments within homogenization models based on the additive interaction law. In the present study, the incorporation of the second moments of stresses into the formulation of the additive Mori–Tanaka model of two-phase elastic–viscoplastic material is discussed. A modified tangent linearization of the viscoplastic law is proposed, while the Hill–Mandel’s lemma is used to track the evolution of second moments of stresses. To study the model performance and efficiency, the results are compared to the full-field numerical calculations and predictions of other models available in the literature. Very good performance of the modified tangent linearization is demonstrated from these benchmarks for both monotonic and non monotonic loading responses.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105191"},"PeriodicalIF":3.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143132827","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}

{"title":"Identification for elastoplastic constitutive parameters of 316L stainless steel lattice structures using finite element model updating and integrated digital image correlation","authors":"Zhaozhen Huang,&nbsp;Caroline Antion,&nbsp;Franck Toussaint","doi":"10.1016/j.mechmat.2024.105232","DOIUrl":"10.1016/j.mechmat.2024.105232","url":null,"abstract":"<div><div>Lattice structures are widely considered for industrial applications owing to their excellent energy absorption and mechanical properties. In this work, octet-truss lattice structures are manufactured from 316L stainless steel powder by selective laser melting (SLM). The geometrical information of lattice structures is captured by SEM and X-ray tomography. It reveals that realistic dimensions of struts differ slightly from CAD-designed ones. The mechanical behaviors are investigated both experimentally and numerically. Quasi-static uni-axial compression experiments with 2D digital image correlation (DIC) technology are conducted to measure displacement/strain fields. Finite element analysis based on an elastic and anisotropic plastic constitutive model is used to simulate mechanical behaviors. To improve the predictive accuracy, a finite element model updating approach is implemented to identify constitutive parameters. The results show that numerical simulation with optimized parameters match well with experiments in aspect of force-displacement curve at elastic–plastic stage and displacement fields.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"202 ","pages":"Article 105232"},"PeriodicalIF":3.4,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179401","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}

{"title":"Relating stiffness changes in porous materials to the evolution of pore space","authors":"Yulia Pronina ,&nbsp;Maria Narykova ,&nbsp;Mark Kachanov","doi":"10.1016/j.mechmat.2024.105236","DOIUrl":"10.1016/j.mechmat.2024.105236","url":null,"abstract":"<div><div>The work aims at relating stiffness changes in porous materials to the evolution of pore space geometry. After a brief review of the relevant micromechanics tools, we apply them to case studies on several metals. In particular, it is clarified, when porosity can or cannot be used as a single quantitative characteristic of the pore space in whose terms the effective stiffness is to be expressed, and when it must be changed to crack density. Namely, the use of porosity parameter is legitimate in cases of isotropic mixtures of pores having approximately equal shape factors, provided the shapes are not strongly oblate (aspect ratios larger than about 0.08). Considered examples show that, in cases of strongly oblate, crack-like pores, noticeable stiffness changes may occur at very low values of porosity; in such cases, the crack density parameter must be used. Besides predicting the effective stiffness in terms of proper characteristics of the pore space, the developed methodology allows monitoring the evolution of pore shapes based on stiffness changes and porosity data. In our analysis, pore geometries are modeled by spheroids of appropriate aspect ratios; they provide sufficient flexibility and allow quantitative modeling. The adequacy of such modeling is supported by agreement of the theoretical results with experimental data.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"202 ","pages":"Article 105236"},"PeriodicalIF":3.4,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179399","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}

{"title":"Homogenised modelling of the electro-mechanical behaviour of a vascularised poroelastic composite representing the myocardium","authors":"Laura Miller ,&nbsp;Raimondo Penta","doi":"10.1016/j.mechmat.2024.105215","DOIUrl":"10.1016/j.mechmat.2024.105215","url":null,"abstract":"<div><div>We propose a novel model for a vascularised poroelastic composite representing the myocardium which incorporates both mechanical deformations and electrical conductivity. Our structure comprises a vascularised poroelastic extracellular matrix with an embedded elastic inclusions (representing the myocytes) and we consider the electrical conductance between these two solid compartments. There is a distinct lengthscale separation between the scale where we can visibly see the connected fluid compartment separated from the poroelastic matrix and the elastic myocyte and the overall size of the heart muscle. We therefore apply the asymptotic homogenisation technique to derive the new model. The effective governing equations that we obtain describe the behaviour of the myocardium in terms of the zero-th order stresses, current densities, relative fluid–solid velocities, pressures, electric potentials and elastic displacements. It effectively accounts for the fluid filling in the pores of the poroelastic matrix, flow in the vessels, the transport of fluid between the vessels and the matrix, and the elastic deformation and electrical conductance between the poroelastic matrix and the myocyte. This work paves the way towards a myocardium model that incorporates multiscale deformations and electrical conductivity whilst also considering the effects of the vascularisation and indeed the impact on mechanotransduction.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"202 ","pages":"Article 105215"},"PeriodicalIF":3.4,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179396","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}

{"title":"Critical exposure time for panel paintings due to change in environmental conditions","authors":"Pietro Foti ,&nbsp;America Califano ,&nbsp;Chao Gao ,&nbsp;Raffaele Sepe ,&nbsp;Chiara Bertolin ,&nbsp;Filippo Berto","doi":"10.1016/j.mechmat.2024.105234","DOIUrl":"10.1016/j.mechmat.2024.105234","url":null,"abstract":"<div><div>Balancing the preservation of historical collections with energy consumption related to climate control is vital in museums and historical buildings to reduce carbon footprints. This is especially important for the structural integrity of hygroscopic objects like panel paintings, which are susceptible to damage from environmental changes. To address these challenges, a Finite Element (FE) hygro-mechanical-uncoupled model has been developed to assess the safety of panel paintings under changing environmental conditions, specifically changes in relative humidity (RH%) at a constant temperature (T). The model, similar to a thermal problem, uses material parameters from literature expressed consistently with RH as the driving potential. It evaluates scenarios involving panel paintings with different wood supports (Pine and Poplar) subjected to abrupt environmental changes, with or without moisture exchange through the gesso layer. This simulation approach investigates the environmental effects and their temporal evolution on panel paintings. The main outcome is the evaluation of the critical exposure time for a panel painting to experience new damage, particularly in the gesso layer, due to internal cracks.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"202 ","pages":"Article 105234"},"PeriodicalIF":3.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143179397","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}

{"title":"Predicting the evolution of texture and grain size during deformation and recrystallization of polycrystals using field fluctuations viscoplastic self-consistent crystal plasticity","authors":"Iftekhar A. Riyad,&nbsp;Marko Knezevic","doi":"10.1016/j.mechmat.2024.105212","DOIUrl":"10.1016/j.mechmat.2024.105212","url":null,"abstract":"<div><div>This paper advances a recent formulation of a field fluctuations viscoplastic self-consistent (FF-VPSC) crystal plasticity model to predict not only the evolution of texture in polycrystalline metals undergoing deformation and recrystallization but also the evolution of grain size. The model considers stress and lattice rotation rate fluctuations inside grains to calculate intragranular misorientation spreads. The spreads are used for modeling of grain fragmentation during deformation and grain nucleation during recrystallization enabling the predictions of concomitant evolution of texture and grain size distributions. The evolutions of textures and grain size distributions are first simulated for commercially pure Cu undergoing severe plastic deformation (SPD) in high pressure torsion to agree well with corresponding experimental data. Next, the evolution of texture and grain size in an aluminum alloy (AA) 5182-O after simple tension and static recrystallization are predicted and compared with experiments. Finally, the predictions of texture and grain size distributions in a magnesium alloy WE43 undergoing a thermo-mechanical loading in the dynamic recrystallization regime are presented and compared with experiments. After validation, the model is coupled with the implicit finite element method (FEM) via a user-material subroutine (UMAT) in Abaqus to facilitate modeling of complex boundary conditions and geometries. The multilevel approach is referred to as FE-FF-VPSC in which every integration point embeds the FF-VPSC constitutive law, considering texture evolution and the directionality of deformation mechanisms operating at the single crystal level. FE-FF-VPSC is applied to simulate a sequence of rolling, recrystallization, and deep drawing of a circular cup of AA6022-T4. The simulated processing sequence demonstrates the versatility of the simulation framework developed in the present paper in not only predicting texture and grain size evolution and phenomena pertaining to behavior of materials but also geometrical shape changes important for the optimization of metal forming processes. To this end, the effects of initial texture and underlying anisotropy on the formation of earing profiles during deep drawing are simulated and discussed.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105212"},"PeriodicalIF":3.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745769","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}

{"title":"Constitutive modeling of transformation-induced plasticity steels considering strength-differential effect","authors":"Jaebong Jung ,&nbsp;Hyeonil Park ,&nbsp;Seung Wook Lee ,&nbsp;Ji Hoon Kim","doi":"10.1016/j.mechmat.2024.105207","DOIUrl":"10.1016/j.mechmat.2024.105207","url":null,"abstract":"<div><div>Transformation-induced plasticity (TRIP) steels undergo martensitic phase transformations due to their austenite phase. In this study, using 1-mm-thick TRIP steel at room temperature, the phase transformation behaviors under tensile and compressive modes were measured using a ferrite scope based on the detection of the magnetic volume. A strength differential (SD) effect was observed, where the tensile strength was lower than the compressive strength. The rate of tensile transformation was faster than that of compressive transformation. To account for the SD effect in finite element analysis, a martensitic kinetics-based constitutive model was developed, which was decomposed into elastic, plastic, Bain, and transformational parts. A larger transformational strain was generated in the tensile mode, and the asymmetric SD effect was captured well by the proposed model.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105207"},"PeriodicalIF":3.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705275","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}

{"title":"Buckling instability of graphyne nanosheets under local indentation","authors":"Jiazhen Zhang ,&nbsp;Peijian Chen ,&nbsp;Juan Peng ,&nbsp;Hao Liu ,&nbsp;Guangjian Peng ,&nbsp;Yingying Zhang","doi":"10.1016/j.mechmat.2024.105206","DOIUrl":"10.1016/j.mechmat.2024.105206","url":null,"abstract":"<div><div>As a novel two-dimensional material, a well understanding of mechanical properties of graphyne under various loading conditions is essential for its blooming applications. However, the buckling mechanism of graphyne under local loads is still unclear, which hinders the development of its related nanodevices. In this work, the buckling behavior of graphyne under local indentation is studied by molecular dynamics simulation and theoretical analysis. It is found that the theoretical prediction of the critical indentation depth for buckling of graphyne agrees well with that from molecular dynamics simulation. The buckling morphology lies in the intermediate region between the contact region and the outer boundary. The critical indentation depth and the buckling morphology can be tuned by adopting various geometric and material parameters. The results should be helpful for not only guiding various applications of graphyne, but also improving the development of nanomechanics.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105206"},"PeriodicalIF":3.4,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705277","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}

{"title":"A yield function based on stress invariants and its extensions: Modeling and validation","authors":"Haoxu Ding ,&nbsp;Tao Zhu ,&nbsp;Xiaorui Wang ,&nbsp;Bing Yang ,&nbsp;Shoune Xiao ,&nbsp;Guangwu Yang ,&nbsp;Guozheng Kang","doi":"10.1016/j.mechmat.2024.105205","DOIUrl":"10.1016/j.mechmat.2024.105205","url":null,"abstract":"<div><div>During the process of plastic deformation, the mechanical response of materials is often influenced by stress states and anisotropic effects, and many existing yield functions are difficult to characterize this phenomenon accurately. This article proposes a yield function based on stress invariants that can encompass a variety of existing relevant models and further expand upon them, conducts parameter sensitivity analysis and concavity convex analysis, and analytically calculates the function parameters under four fundamental stress states. The strain-hardening behavior of four metals, AA7075-T6, QP1180, AA5754-O, and DP980, was described using this function. The advantages and disadvantages of parameter analysis calculation and fitting calculation methods were analyzed. On this basis, the nonlinear dependence of the hydrostatic pressure of the function is expanded and used to describe the yield behavior of three metal foams, namely low-density, high-density, and Duocel, and the failure behavior of rock materials. Extend the function to anisotropy using the Balat'91 linear transformation tensor to describe the anisotropic yield behavior of AA2008-T4, using the interpolation method to describe the anisotropic hardening behavior of zirconium plates. The results show that the yield function proposed in this paper can accurately predict the anisotropic yield and hardening behavior of metal materials, foam metal yield behavior, and geotechnical materials' fracture characteristics.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105205"},"PeriodicalIF":3.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705279","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}