Mechanics of Materials最新文献_第10页

Local measurement on oedometric compression tests: Time and temperature ageing effects on a fluorosilicone Oedometric 压缩试验的局部测量：时间和温度老化对氟硅树脂的影响

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-13 DOI: 10.1016/j.mechmat.2024.105193

Clémence Logeais, Cristian Ovalle, Lucien Laiarinandrasana

{"title":"Local measurement on oedometric compression tests: Time and temperature ageing effects on a fluorosilicone","authors":"Clémence Logeais, Cristian Ovalle, Lucien Laiarinandrasana","doi":"10.1016/j.mechmat.2024.105193","DOIUrl":"10.1016/j.mechmat.2024.105193","url":null,"abstract":"<div><div>O-ring durability is a key issue for engineering structures that require sealing over a long service life. Rubber-like materials are used for this type of component because of the assumption of incompressibility, i.e. a high bulk modulus <span><math><mi>K</mi></math></span>. However, this assumption has been called into question in the literature, particularly for elastomers under high hydrostatic pressures. This work examines the compressibility of rubber-like materials, with a particular focus on fluorosilicone elastomers (FVMQ). A method of confined compression using a transparent crucible is presented which allows local measurement of the displacement field. This technique provides a better understanding of the analysis of oedometric compression data and a reliable way to determine the <span><math><mi>K</mi></math></span> value. Furthermore, this approach allows following the evolution of <span><math><mi>K</mi></math></span> over time with accelerated ageing. Three ageing temperatures – 200, 220 and 250 °C – were tested up to 34, 15 and 1 weeks, respectively. For the three ageing temperatures, the FVMQ results show a decrease in <span><math><mi>K</mi></math></span> values with ageing. In particular, at 250 °C, a turning point was observed after 72 h of ageing. These results highlight the influence of ageing on the compressibility of the FVMQ and the presence of two different ageing mechanisms affecting the <span><math><mi>K</mi></math></span> evolution.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105193"},"PeriodicalIF":3.4,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705276","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

Relaxing strong compatibility at atomistic-continuum interface: Consistent linear coupling method 原子-真空界面的强相容性松弛：一致的线性耦合方法

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-12 DOI: 10.1016/j.mechmat.2024.105204

Pouya Towhidi, Manouchehr Salehi

引用次数: 0

Investigation of the history-dependent nonlinear micro-viscoplasticity behavior of dual-phase steel using crystal plasticity finite element method 利用晶体塑性有限元法研究双相钢的历史依赖性非线性微粘塑性行为

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-09 DOI: 10.1016/j.mechmat.2024.105202

Jaebong Jung , Ji Hoon Kim

引用次数: 0

Rules to identify and track the evolution dynamics of {101̄2} twin variants in hexagonal close-packed metals 识别和跟踪六方紧密堆积金属中{101̄2}孪生变体演变动态的规则

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-07 DOI: 10.1016/j.mechmat.2024.105190

Sunil Rawat

{"title":"Rules to identify and track the evolution dynamics of {101̄2} twin variants in hexagonal close-packed metals","authors":"Sunil Rawat","doi":"10.1016/j.mechmat.2024.105190","DOIUrl":"10.1016/j.mechmat.2024.105190","url":null,"abstract":"<div><div>Twinning evolution laws derived based on physics are required to model plasticity and texture evolution resulting from the twinning in hexagonal close-packed structures. Atomistic simulations are employed to study the evolution of <span><math><mrow><mo>{</mo><mn>10</mn><mover><mrow><mn>1</mn></mrow><mrow><mo>̄</mo></mrow></mover><mn>2</mn><mo>}</mo></mrow></math></span> twins in Ti at 5 K temperature. The misorientation angle between the twinned region and parent matrix differs from the expected misorientation angle of 85.03<span><math><msup><mrow></mrow><mrow><mo>∘</mo></mrow></msup></math></span>. This closely aligns with the experimental findings. The deviation of twinning from <span><math><mrow><mo>{</mo><mn>10</mn><mover><mrow><mn>1</mn></mrow><mrow><mo>̄</mo></mrow></mover><mn>2</mn><mo>}</mo></mrow></math></span> twin plane makes it difficult to identify conjugate twins, leading to their coalescence. Both the c-vector and disorientation angle analyses are unable to track the variant type of the conjugate twins. The disorientation angle analysis can identify the conjugate twin variants but is unable to identify the variant type of the twin. The c-vector analysis can identify the conjugate twin variants as well as the variant type of the twin but is unable to track the variant type of the twin during its evolution. A set of rules are proposed to track the variant type of the twin during its evolution. These rules should help to understand the twin evolution dynamics in HCP metals and can be applied to study the twinning evolution dynamics at ambient conditions, even though they are designed for twinning evolution at 5 K temperature. The fundamental understanding of twin evolution dynamics should motivate the construction of the physics-based evolution laws for twinning.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105190"},"PeriodicalIF":3.4,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660234","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}

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A continuum magneto-viscoelastic model for isotropic soft magnetorheological elastomers: experiments, theory and numerical implementation 各向同性软磁流变弹性体的连续磁-粘弹性模型：实验、理论和数值实现

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-07 DOI: 10.1016/j.mechmat.2024.105187

Kostas Danas , Masami Nakano , Gaël Sebald

{"title":"A continuum magneto-viscoelastic model for isotropic soft magnetorheological elastomers: experiments, theory and numerical implementation","authors":"Kostas Danas , Masami Nakano , Gaël Sebald","doi":"10.1016/j.mechmat.2024.105187","DOIUrl":"10.1016/j.mechmat.2024.105187","url":null,"abstract":"<div><div>This study deals with the experimental, theoretical and numerical investigation of the nonlinear viscoelastic response of magnetically soft magnetorheological elastomers (commonly known as <span><math><mi>s</mi></math></span>-MREs and denoted here simply as MREs) subjected to combined magnetic and simple shear loads. We consider a fairly soft mechanically MRE. The experiments show a strong effect of the magnetic field on the resulting viscosity and hence dissipated energy expanded by the material during a simple shear cycle. Moreover, the effect of frequency on the response is weak indicating strongly nonlinear viscous effects similar to non-Newtonian fluids. An analytical magneto-viscoelastic model is proposed exhibiting magneto-mechanical coupling at both equilibrium and non-equilibrium energies as well as on the dissipation potential. The model is calibrated by solving in a semi-analytical way a simplified boundary value problem (BVP) of an infinite thin MRE strip embedded in an infinite air domain. These simplified solutions are cross-validated by full-field finite element simulations of the experimental setup showing very good agreement between the experimental data and model estimates. This illustrates the validity of the simplified material model for the proposed experimental setup and sets the ground for a more universal experimental protocol to characterize properly the finite strain response of MREs more generally.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105187"},"PeriodicalIF":3.4,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660236","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

Extraction of slip systems and twinning variants from a Lagrangian analysis of molecular dynamics simulations 从分子动力学模拟的拉格朗日分析中提取滑移系统和孪晶变体

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-07 DOI: 10.1016/j.mechmat.2024.105189

Paul Lafourcade, Guillaume Ewald, Thierry Carrard, Christophe Denoual

{"title":"Extraction of slip systems and twinning variants from a Lagrangian analysis of molecular dynamics simulations","authors":"Paul Lafourcade, Guillaume Ewald, Thierry Carrard, Christophe Denoual","doi":"10.1016/j.mechmat.2024.105189","DOIUrl":"10.1016/j.mechmat.2024.105189","url":null,"abstract":"<div><div>The definition of multiscale constitutive laws for metals under extreme conditions requires a detailed understanding of the irreversible deformation mechanisms, e.g., dislocation motion and their interaction with obstacles: other dislocations, twin boundaries, etc. We propose to study the signature of dislocation-mediated plasticity and twinning deformation in large-scale molecular dynamics simulations with Lagrangian deformation measures. Through the computation of the deformation gradient tensor, we are able to discriminate, e.g., the slip/twinning directions and slip/twinning planes. The effectiveness of the developed method is demonstrated on two applications. We first study the identification of activated slip systems during the dynamic uniaxial deformation of a single-crystal copper containing voids, operating as dislocation nucleation sources. An application on a single crystal tantalum under high strain-rate loading demonstrates the accuracy of the presented method to extract statistics related to the activation of twinning variants and the details of their interaction with slip systems. The developed tool is entitled <span>S2TXA</span> for Slip System and Twinning eXtraction Algorithm and will be made available publicly.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105189"},"PeriodicalIF":3.4,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660235","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

Deformation and delamination of dynamically bulging bilayered films 动态鼓胀双层薄膜的变形和分层

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-05 DOI: 10.1016/j.mechmat.2024.105192

Jasdeep Singh, Ankit Srivastava, Michael J. Demkowicz

{"title":"Deformation and delamination of dynamically bulging bilayered films","authors":"Jasdeep Singh, Ankit Srivastava, Michael J. Demkowicz","doi":"10.1016/j.mechmat.2024.105192","DOIUrl":"10.1016/j.mechmat.2024.105192","url":null,"abstract":"<div><div>We employ finite element simulations to study the dynamic bulging of films under shock tube conditions and compare these responses with quasi-static bulging. Both scenarios subject the film to time-varying pressure. Two film types are considered: uniform material films and bilayers with a relatively soft interior layer and a hard exterior layer. The interface between the materials in the bilayer cases is modeled as a cohesive zone that follows a bilinear normal traction-separation cohesive law. Additionally, bilayer films with preexisting cracks in the interior layer are analyzed. Parametric studies are also conducted to explore the effects of loading rate and specimen size. The mechanical response of all materials is assumed to be strain-rate independent, focusing solely on the inertial effects in the response of the films under dynamic loading, and the absence of such effects under quasi-static loading. The results indicate that quasi-static bulging exhibits a predictable plate bending like deformation. In contrast, depending on the loading rate and specimen size, dynamic bulging can give rise to elastic waves, and a sequence of deformation processes including initial uniform acceleration, followed by bending-like deformation, and finally through-thickness biaxial stretching. Dynamic loading also leads to larger bulge formation and greater deformation than quasi-static loading. A key finding is the role of preexisting cracks in driving delamination under dynamic loading, which is absent in quasi-static loading. This work enhances our understanding of dynamic bulging and motivates further research on characterizing delamination in layered films using dynamic bulge tests.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105192"},"PeriodicalIF":3.4,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660232","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

Electro-mechanical-carrier coupling model of single piezoelectric semiconductor fiber pull-out 单根压电半导体光纤拉出的机电-载波耦合模型

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-11-01 DOI: 10.1016/j.mechmat.2024.105188

Cai Ren, Chao Liu, Kaifa Wang, Baolin Wang

{"title":"Electro-mechanical-carrier coupling model of single piezoelectric semiconductor fiber pull-out","authors":"Cai Ren, Chao Liu, Kaifa Wang, Baolin Wang","doi":"10.1016/j.mechmat.2024.105188","DOIUrl":"10.1016/j.mechmat.2024.105188","url":null,"abstract":"<div><div>Recently, piezoelectric semiconductor (PS) fiber composite materials are widely used in flexible and wearable optoelectronics owing to their unique properties of possessing piezoelectricity and semiconduction simultaneously. It is of great importance to investigate the interfacial characteristics of PS fiber composites in case of interfacial damages between PS fiber and elastic matrix. In this paper, a theoretical model of single piezoelectric semiconductor fiber pull-out is established to study the electro-mechanical-carrier coupling characteristics and interfacial behaviors of fiber/matrix system. Based on the shear-lag theory, the stress transfer relationship between PS fiber and elastic matrix is investigated. Closed form solutions of distributions of relevant electromechanical fields and carrier perturbation are obtained as well. The results show that the change of material parameters and structure parameters can effectively tune the mechanical, electrical and interfacial properties of composite system. In addition, the value of initial carrier concentration which reveals the semiconducting property of PS fiber has a significant influence on the distributions of electromechanical fields. The findings are valuable for adjusting the electromechanical coupling behaviors of PS fiber via specific structure design and material combination in practical applications of piezotronics.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"200 ","pages":"Article 105188"},"PeriodicalIF":3.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660233","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

The elastic properties of fiber-reinforced materials with imperfect interfacial bondings: Analytical approximations versus full-field simulations 界面结合不完美的纤维增强材料的弹性特性：分析近似与全场模拟

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-10-28 DOI: 10.1016/j.mechmat.2024.105185

Valentin Gallican , Miroslav Zecevic , Ricardo A. Lebensohn , Martín I. Idiart

{"title":"The elastic properties of fiber-reinforced materials with imperfect interfacial bondings: Analytical approximations versus full-field simulations","authors":"Valentin Gallican , Miroslav Zecevic , Ricardo A. Lebensohn , Martín I. Idiart","doi":"10.1016/j.mechmat.2024.105185","DOIUrl":"10.1016/j.mechmat.2024.105185","url":null,"abstract":"<div><div>New analytical approximations are proposed for the linear elastic properties of fiber materials with imperfect interfacial bondings, across which displacements jump in proportion to the tractions, for finite volume fraction of reinforcements. The fibers are all parallel, isotropically distributed on the transverse plane, and of circular cross section. Elastic properties of both matrix and reinforcement can be arbitrary, but those of their interfacial bonding are restricted to a particular form of common use. Proposals rely on the combined use of the Hashin–Shtrikman approximation for perfectly bonded systems and the equivalent inclusion concept adapted to the peculiar geometry of fibers. Three distinct approximations are considered which differ in the way the elastic properties of the interfacial bonding are averaged over the interfacial surface; they either involve an arithmetic, a harmonic, or a mixed average. Their accuracy is assessed by confronting them to full-field simulations generated with a Fast Fourier Transform-based algorithm suitably implemented to handle interfacial imperfections. Comparisons for transversely isotropic materials with monodisperse reinforcements confirm the superiority of the harmonic and mixed approximations over the more common arithmetic approximation. Overall, the mixed approximation is found to provide the most accurate estimates for a wide range of interfacial bondings and reinforcement contents. The approximations should therefore constitute a valuable ingredient in mean-field descriptions for fiber-reinforced materials incorporating interfacial deformation processes.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"199 ","pages":"Article 105185"},"PeriodicalIF":3.4,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572357","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}

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Comprehensive analysis of wave interactions and resulting spall damage in layered heterogeneous medium under impact 冲击下层状异质介质中波的相互作用及其导致的剥落损伤的综合分析

IF 3.4 3区材料科学

Mechanics of Materials Pub Date : 2024-10-26 DOI: 10.1016/j.mechmat.2024.105182

Satyendra Pratap Singh , Harpreet Singh , Puneet Mahajan

{"title":"Comprehensive analysis of wave interactions and resulting spall damage in layered heterogeneous medium under impact","authors":"Satyendra Pratap Singh , Harpreet Singh , Puneet Mahajan","doi":"10.1016/j.mechmat.2024.105182","DOIUrl":"10.1016/j.mechmat.2024.105182","url":null,"abstract":"<div><div>The effect of dynamic spall damage on the response of layered medium subjected to one-dimensional impact involving an impactor and a multi-layered target is investigated. The study examines the damage caused by elastic waves below the Hugoniot Elastic Limit (HEL) during impact events. Analytical expressions of stress and particle velocity derived from mass and momentum conservation principles are utilized to solve the wave interactions within the impactor-target system, considering reflections, transmissions, and wave interactions between layers. These analytical expressions, integrated into a computational framework, facilitate the monitoring of material responses following each wave interaction, thereby analysing the impact response of the layered medium. Wave interactions, resulting in tensile stresses, that can cause damage to the target have been identified. A strain-based damage initiation and evolution law is incorporated into the developed computer program to predict damage in each layer of a medium. Damage alters the medium’s impact behaviour by decreasing stress magnitude and inducing temporal delays in the response due to attenuated wave propagation speed. The occurrences of tensile stress are explored, analysing spatial and temporal variations of multiple damage incidents within the layered medium. The tension at the interface between two layers can induce damage in one or both adjacent layers, leading to debonding between layers. The effect of damage on the impact response of the medium is analysed by comparing the results for the damaged and undamaged target scenarios. The impact behaviour of a single-layer and a multi-layer target obtained from the present model, in terms of stress and particle velocity, is verified through Finite Element simulations of the identical impact problems, where the damage evolution criterion is incorporated using a VUMAT subroutine. The outcomes derived from this study align closely with Finite Element (FE) results.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"199 ","pages":"Article 105182"},"PeriodicalIF":3.4,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142587314","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