Continuum Mechanics and Thermodynamics最新文献_第8页

Thermo-oxidative aging of natural rubber: experimental study and a thermodynamically consistent mechanical-chemical-diffusion model 天然橡胶的热氧化老化：实验研究和热力学一致的机械-化学-扩散模型

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-08-05 DOI: 10.1007/s00161-024-01317-0

A. Jalalpour, J. Arghavani, R. Naghdabadi

{"title":"Thermo-oxidative aging of natural rubber: experimental study and a thermodynamically consistent mechanical-chemical-diffusion model","authors":"A. Jalalpour, J. Arghavani, R. Naghdabadi","doi":"10.1007/s00161-024-01317-0","DOIUrl":"10.1007/s00161-024-01317-0","url":null,"abstract":"<div><p>Elastomers have diverse properties that make them suitable for use in many industrial applications. Natural Rubber, in particular, is an attractive elastomer due to its desirable mechanical properties as well as lightweight compared to metals. However, due to the natural rubber structure, these elastomers are susceptible to heat, oxidation, and chemical compounds, which limits their potential use. In this paper, in order to study the behavior of natural rubber under thermo-oxidative aging, experiments, including continuous stress relaxation, creep, and intermittent tensile tests, are carried out on the samples. Based on the experimental results and using dynamic-network model, a mechanical-chemical-diffusion model is proposed to predict the changes in natural rubber properties during thermo-oxidative aging considering the effect of the natural rubber curing system. In the chemical part of the model, the two main process of aging, including chain scission and crosslinking, are modeled by using two internal variables. The proposed model is implemented using the finite element method to simulate experimental tests for the model verification. The comparisons demonstrate the proposed model ability to accurately simulate the various loading states under thermo-oxidative aging of natural rubber.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 6","pages":"1579 - 1595"},"PeriodicalIF":1.9,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141891829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From approximation of dissipative systems to representative space-time volume elements for metamaterials 从耗散系统近似到超材料的代表性时空体积元素

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-08-02 DOI: 10.1007/s00161-024-01318-z

Olga Chekeres, Vladimir Salnikov, Francesco D’Annibale

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Surface layer effect on high pressure phase growth in a bicrystal: phase field model and simulations 双晶中高压相生长的表层效应：相场模型与模拟

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-07-25 DOI: 10.1007/s00161-024-01316-1

Seyed Hamed Mirmahdi, Mahdi Javanbakht, Emilio Barchiesi

{"title":"Surface layer effect on high pressure phase growth in a bicrystal: phase field model and simulations","authors":"Seyed Hamed Mirmahdi, Mahdi Javanbakht, Emilio Barchiesi","doi":"10.1007/s00161-024-01316-1","DOIUrl":"10.1007/s00161-024-01316-1","url":null,"abstract":"<div><p>Effect of the external surface layer on the phase transition (PT) between the low pressure phase and high pressure phase (HPP) in a NiAl bicrystal is investigated. Using a phase field model, the external surface layer is included, within which the elastic properties and surface energy are properly distributed. After resolving a stationary layer, the coupled phase field and elasticity equations are solved to capture the HPP evolution. Residual stress concentrator is included as a shear band representing an inelastic shear strain. Due to the small grain size, the surface layer can influence the stress distribution and consequently, the critical inelastic shear strain <span>(gamma _{cr})</span> for the HPP growth. Above a certain applied pressure, the surface layer width <span>({Delta }_{{xi }})</span> shows no effect on <span>(gamma _{cr})</span>, e.g., <span>(P=10)</span> GPa for the grain size of L <span>(=)</span> 20 nm. For lower pressures, <span>(gamma _{cr})</span> increases as pressure reduces. Due to the interplay of size addition by the surface layer and size reduction by the transformation strain, <span>(gamma _{cr})</span> reduces versus <span>({Delta }_{{xi }})</span> and then increases for larger <span>({Delta }_{{xi }})</span>. For smaller grain sizes, the surface layer effect is promoted as it is imposed to a larger transformation work. The lowest <span>(gamma _{cr})</span> is obtained for <span>(P=19)</span> GPa, in good agreement with the theoretical pressure of 20 GPa. Combining the external shear on pressure adds an extra shear term to the transformation work, which allows for the relaxation of the shear band and results in a nonlinear reduction of the PT pressure versus applied shear.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 6","pages":"1565 - 1577"},"PeriodicalIF":1.9,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid discrete-to-continuum viscoelastic viscoplasticity by volume constraint 通过体积约束实现离散到连续的混合粘弹粘塑性

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-07-19 DOI: 10.1007/s00161-024-01313-4

E. C. Bryant, N. A. Miller, K. C. Bennett

{"title":"Hybrid discrete-to-continuum viscoelastic viscoplasticity by volume constraint","authors":"E. C. Bryant, N. A. Miller, K. C. Bennett","doi":"10.1007/s00161-024-01313-4","DOIUrl":"10.1007/s00161-024-01313-4","url":null,"abstract":"<div><p>Material modeling for micromorphic continua (in the sense of Eringen and Suhubi [IJES, 1964]) of combined viscoelastic-viscoplastic constitutive nonlinearity is developed, for application to some geomaterials and other granular materials, and is recast in a compact energetic formulation via “granular micromechanics.” Under the granular mechanics homogenization paradigm, potentials and pseudo-potentials for viscoelastic viscoplasticity are scale-bridged by averaging discrete grain-contact interactions over a representative granular assemblage. As a critical feature of the proposed multiscale method, higher-order kinematics are considerably simplified by employing a microstructural length scale in conjunction with Taylor-series expansion. In distinction to prior micromorphic micromechanics, our discrete-to-continuum scale-bridging embeds a volume constraint to weakly enforce mean-field definitions in the representative assemblage by the method of Lagrange multipliers: analogous to the classical three-field reformulation of a mixed interpolation space for nonlinear finite elements’ selective integration. As subsequently demonstrated, volume-constrained reformulation renders micromorphic modeling constitutively appropriate for viscoelastic viscoplastic particulate materials. As a consequence, coupled pressure- and rate-sensitive dissipative phenomena - i.e., of combined viscoelasticity and Drucker–Prager viscoplasticity– -become microstructurally sensitive and algorithmically advantageous, utilizing numerical methods in bound-constrained optimization.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 6","pages":"1527 - 1551"},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141726069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of an initially stressed functionally graded thermoelastic medium (type III) without energy dissipation 无能量耗散的初始受压功能梯度热弹性介质（III 型）分析

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-07-16 DOI: 10.1007/s00161-024-01315-2

Praveen Ailawalia, Anchal Sharma, Marin Marin, Andreas Öchsner

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Comparison of extended irreversible thermodynamics and nonequilibrium statistical operator method with thermodynamics based on a distribution containing the first-passage time 扩展不可逆热力学和非平衡统计算子法与基于包含第一通过时间的分布的热力学的比较

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-07-11 DOI: 10.1007/s00161-024-01311-6

V. V. Ryazanov

引用次数: 0

Technological support for the durability of metal-cutting tools by the formation of wear-resistant coatings using energy-efficient methods 利用节能方法形成耐磨涂层，为金属切削工具的耐用性提供技术支持

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-07-01 DOI: 10.1007/s00161-024-01312-5

Yao Ju, Ievgen Konoplianchenko, Mykhailo Dumanchuk, Jiafei Pu, Qi Dong, Zhengchuan Zhang

{"title":"Technological support for the durability of metal-cutting tools by the formation of wear-resistant coatings using energy-efficient methods","authors":"Yao Ju, Ievgen Konoplianchenko, Mykhailo Dumanchuk, Jiafei Pu, Qi Dong, Zhengchuan Zhang","doi":"10.1007/s00161-024-01312-5","DOIUrl":"10.1007/s00161-024-01312-5","url":null,"abstract":"<div><p>The purpose of this study was to evaluate the possibility of using mechanical spectroscopy to determine the strength of tool coatings from their lifespan. Mechanical spectroscopy with the determination of the index tan<span>(delta )</span> (internal friction) was used as the research method. Samples were coated with lamellae composed of WC-6wt% Co cemented carbides. The specimens measured 1.0 mm, 3.0 mm, and 40.0 mm, created using a conventional industrial liquid phase sintering procedure. The original powder consisted of cobalt with traces of chromium and vanadium, and submicron WC grains. The tools tested included carbide cutting tools, and the workpieces were steel alloys. Comparative results showed that coated tools had significantly improved tool life and durability. The relationship between the coating and tool life was evident, providing a practical approach for predictive and non-destructive analyses of coatings on tool durability for composite and finely structured materials.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 6","pages":"1515 - 1525"},"PeriodicalIF":1.9,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141489557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A general analytical approach to the thermoelastic analysis of asymmetric anisotropic nanoplate with polygonal holes 带多边形孔的非对称各向异性纳米板热弹性分析的一般分析方法

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-06-22 DOI: 10.1007/s00161-024-01309-0

Vahid Zeighami, Mohammad Jafari, Holm Altenbach

{"title":"A general analytical approach to the thermoelastic analysis of asymmetric anisotropic nanoplate with polygonal holes","authors":"Vahid Zeighami, Mohammad Jafari, Holm Altenbach","doi":"10.1007/s00161-024-01309-0","DOIUrl":"10.1007/s00161-024-01309-0","url":null,"abstract":"<div><p>The structural complexity of high-tech industries is often compromised by a combination of thermal, mechanical, and geometric weaknesses. New generation materials and engineering the structure of materials are among the techniques that engineers employ to eliminate these effects. In this study, a comprehensive analysis solution is derived using Lekhnitskii’s complex variable approach with the use of general mapping functions, the concept of functionally graded materials (FGMs), and holomorphic functions in the form of Laurent series. This general solution is used for the thermoelastic analysis of perforated functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates with polygonal hole. A refined-calibrated rule of mixtures is used to approximate the material property of FG-CNTRC plates according to gradational changes in direction of thickness and available molecular dynamics simulations results. After validation of present analytical solution results with finite element analysis results and available mechanical analysis of composite plates results, stress and moment resultants due to remoting heat flux-mechanical loading is studied. The effect of FG-CNTRC material properties, heat flux condition, and four parameters affecting the shape of the polygonal holes has been investigated. During the present parametric analysis, the results clearly show that the parameters related to the FG-CNTRC material properties, flux conditions, and hole geometry each provide a reliable tool for designers to influence the stress and moment resultants to minimize undesirable stresses. This general formulation is able to calculate thermoelastic parameters (thermal and mechanical parameters, separately) for the generalized problems of the FGM plate or composite laminates with a polygonal hole.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 6","pages":"1455 - 1480"},"PeriodicalIF":1.9,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141441497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the initial boundary values problem for a mixture of two Cosserat bodies with voids 关于带有空隙的两个科塞拉特体混合物的初始边界值问题

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-06-10 DOI: 10.1007/s00161-024-01310-7

Marin Marin, Andreas Öchsner, Sorin Vlase

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A bone remodeling approach encoding the effect of damage and a diffusive bio-mechanical stimulus 编码损伤效应和扩散性生物机械刺激的骨重塑方法

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-05-25 DOI: 10.1007/s00161-024-01308-1

Daniela Addessi, Francesco D’Annibale, Luca Placidi, Ivan Giorgio

{"title":"A bone remodeling approach encoding the effect of damage and a diffusive bio-mechanical stimulus","authors":"Daniela Addessi, Francesco D’Annibale, Luca Placidi, Ivan Giorgio","doi":"10.1007/s00161-024-01308-1","DOIUrl":"10.1007/s00161-024-01308-1","url":null,"abstract":"<div><p>The paper focuses on the effect of damage on the bone remodeling process. This is a crucial, although complex, aspect. A one-dimensional continuous deformable body is employed to model living bone tissue. The model incorporates the bone functional adaptation through an evolution law for an effective elastic modulus driven by mechanical feedback via a mechano-transduction diffusive signal. This type of information transduction, i.e., diffusion, is essential for the model to take into account remodeling in the case of minor injury or pathology-affected regions where there is no signal production. In addition, the model is able to also take into account potential tissue damage that may evolve over time according to a suitable evolution law. To illustrate the capability of the model to describe the mentioned complex coupled phenomena, numerical tests have been performed encompassing high external loads causing the onset of damage and cyclic loading for healing. The numerical simulations carried out via finite-element analyses yield insights into the mechanisms of bone remodeling, with the final goal of aiding clinical decisions and implant designs for bone health and repair. Overall, a key aspect of the paper is to highlight the feasibility of modeling the evolution in bone elasticity arising from the combined effect of damage and remodeling.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"36 4","pages":"993 - 1012"},"PeriodicalIF":1.9,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00161-024-01308-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141096659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0