Journal of The Mechanics and Physics of Solids最新文献_第3页

Fracture and size effect in mechanical metamaterials 机械超材料中的断裂和尺寸效应

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-10 DOI: 10.1016/j.jmps.2024.105860

引用次数: 0

90-degree peeling of elastic thin films from elastic soft substrates: Theoretical solutions and experimental verification 从弹性软基底上 90 度剥离弹性薄膜：理论解决方案与实验验证

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-08 DOI: 10.1016/j.jmps.2024.105855

{"title":"90-degree peeling of elastic thin films from elastic soft substrates: Theoretical solutions and experimental verification","authors":"","doi":"10.1016/j.jmps.2024.105855","DOIUrl":"10.1016/j.jmps.2024.105855","url":null,"abstract":"<div><p>Peeling of thin films has been widely used in adhesion measurement, film transfer and bio-inspired design. Most previous studies focused on the peeling of thin films from rigid substrates, but soft substrates are common in practical applications. Herein, we propose a two-dimensional model based on the bilinear cohesive law to characterize the 90-degree peeling of elastic thin films from elastic soft substrates, and obtain theoretical solutions expressed in terms of the Chebyshev series. The theoretical solutions match well with the finite element method results, including the load-displacement curves and the bulging deformation of soft substrates. We find that with decreasing substrate modulus, the maximum peeling force (<span><math><msub><mi>P</mi><mtext>max</mtext></msub></math></span>) decreases but the steady-state peeling force remains unchanged. With the present solutions, the interfacial strength and fracture energy can be extracted simultaneously from the 90-degree peeling experiments of thin film/soft substrate systems, and then the experimentally measured <span><math><msub><mi>P</mi><mtext>max</mtext></msub></math></span> for different film thicknesses can be well predicted. Furthermore, we obtain a new power scaling law of <span><math><msub><mi>P</mi><mtext>max</mtext></msub></math></span>, where the scaling exponent depends on substrate elasticity. These results can help us measure the interfacial properties of thin film/soft substrate systems via peel tests, and regulate their peeling behaviors by interface design.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142173414","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}

引用次数: 0

Cracking in semiconductor devices–effect of plasticity under triaxial constraint 三轴约束下的塑性对半导体器件开裂的影响

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-08 DOI: 10.1016/j.jmps.2024.105856

引用次数: 0

Self-consistent solution of the Frank–Bilby equation for interfaces containing disconnections 包含断开的界面的弗兰克-比尔比方程的自洽解

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-07 DOI: 10.1016/j.jmps.2024.105845

{"title":"Self-consistent solution of the Frank–Bilby equation for interfaces containing disconnections","authors":"","doi":"10.1016/j.jmps.2024.105845","DOIUrl":"10.1016/j.jmps.2024.105845","url":null,"abstract":"<div><p>The quantized Frank–Bilby equation can be used to identify interfacial line defect array configurations which relax the misorientation and/or misfit of a coherent crystalline interface. These line defect arrays may be comprised of dislocations and/or disconnections, which are interfacial steps with dislocation character. When an interface contains disconnections, solution of the quantized Frank–Bilby equation is complicated by the fact that the habit plane orientation is not known in advance because it depends on the unknown spacing of the disconnection array. We present a root-finding-based method for addressing this issue, enabling a self-consistent solution for arbitrary defect content. Our method has been implemented in an open-source code which enumerates all possible solutions given a list of candidate line defects. Two cases are presented employing the code: a misoriented FCC twin boundary and an FCC/BCC phase boundary with the Nishiyama-Wasserman orientation relationship. Both cases exhibit more than 10,000 solutions to the Frank–Bilby equation, with several hundred solutions categorized as “low energy” and thus plausible configurations for the actual interface. The resulting set of solutions can be utilized to predict and understand the properties of a given interface.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022509624003119/pdfft?md5=5e3a5c54a570c8e21020d022435478f9&pid=1-s2.0-S0022509624003119-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Intrinsic interlayer shear strength of graphite 石墨的固有层间剪切强度

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-06 DOI: 10.1016/j.jmps.2024.105853

{"title":"Intrinsic interlayer shear strength of graphite","authors":"","doi":"10.1016/j.jmps.2024.105853","DOIUrl":"10.1016/j.jmps.2024.105853","url":null,"abstract":"<div><p>Graphite holds significant values in the energy and electronics industries due to its unique properties. As a quintessential example of highly anisotropic materials, the shear strength measures one of its most fundamental mechanical properties. However, the lack of ideal materials and testing methods has led to a wide dispersion in the reported values. To address this issue, we utilized epitaxially grown single-crystal graphite and developed a high-throughput sample preparation method, along with a novel loading technique in this work. The intrinsic shear strength of AB-stacked graphite was determined to be <em>τ</em><sub>s</sub> = 62 MPa, by excluding the size effect in measurements. The results are further compared to highly oriented pyrolytic graphite specimens processed down to nanoscale thickness, highlighting the adverse impact of twisted single-crystalline interfaces between the graphitic layers. Additionally, we observed a distinctive failure mechanism with continuous and uniform cascade plastic slips across the thickness of graphite samples, which corresponds to an interlayer shear strength approaching <em>τ</em><sub>s</sub>. The intrinsic shear strength characterized in our work sets an upper limit for the interlayer shear resistance of graphite. The experimental procedure for measuring shear strength can be applied to other van der Waals materials.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142243844","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}

引用次数: 0

Bulk and fracture process zone contribution to the rate-dependent adhesion amplification in viscoelastic broad-band materials 粘弹性宽带材料中的块体和断裂加工区对随速率变化的粘附放大的贡献

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-02 DOI: 10.1016/j.jmps.2024.105844

{"title":"Bulk and fracture process zone contribution to the rate-dependent adhesion amplification in viscoelastic broad-band materials","authors":"","doi":"10.1016/j.jmps.2024.105844","DOIUrl":"10.1016/j.jmps.2024.105844","url":null,"abstract":"<div><p>The contact between a rigid Hertzian indenter and an adhesive broad-band viscoelastic substrate is considered. The material behavior is described by a modified power law model, which is characterized by only four parameters, the glassy and rubbery elastic moduli, a characteristic exponent <span><math><mi>n</mi></math></span> and a timescale <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span>. The maximum adherence force that can be reached while unloading the rigid indenter from a relaxed viscoelastic half-space is studied by means of a numerical implementation based on the boundary element method, as a function of the unloading velocity, preload and by varying the broadness of the viscoelastic material spectrum. Through a comprehensive numerical analysis we have determined the minimum contact radius that is needed to achieve the maximum amplification of the pull-off force at a specified unloading rate and for different material exponents <span><math><mi>n</mi></math></span>. The numerical results are then compared with the prediction of Persson and Brener viscoelastic crack propagation theory, providing excellent agreement. However, comparison against experimental tests for a glass lens indenting a PDMS substrate shows data can be fitted with the linear theory only up to an unloading rate of about <span><math><mrow><mn>100</mn><mspace></mspace><mi>μ</mi><mi>m/s</mi></mrow></math></span> showing the fracture process zone rate-dependent contribution to the energy enhancement is of the same order of the bulk dissipation contribution. Hence, the limitations of the current numerical and theoretical models for viscoelastic adhesion are discussed in light of the most recent literature results.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148611","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}

引用次数: 0

Instabilities in a two-dimensional granular fault gouge: Particle dynamics and stress fluctuations 二维粒状断层冲沟中的不稳定性：颗粒动力学和应力波动

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-09-01 DOI: 10.1016/j.jmps.2024.105843

{"title":"Instabilities in a two-dimensional granular fault gouge: Particle dynamics and stress fluctuations","authors":"","doi":"10.1016/j.jmps.2024.105843","DOIUrl":"10.1016/j.jmps.2024.105843","url":null,"abstract":"<div><p>Predicting stress fluctuations in granular media under steady-state shear loading is crucial for applications ranging from geophysical processes to construction engineering. Stress fluctuations emerge from particle rearrangement, usually enabled by frictional slip and force-chain buckling. Existing models used to predict stress fluctuations are largely phenomenological, often accounting for the force chain phenomena implicitly through the introduction of internal variables, or explicitly through assumptions of force chain mechanics. Improper consideration of particle mechanics or mesoscale effects can lead to inaccurate predictions of shear strength and instability, making it difficult to predict the onset of yielding, shear band formation, and other instabilities. Furthermore, while recent advancements in machine learning methods have established links between microscale behavior and macroscopic stress drops in granular fault gouges, their predictive capabilities are limited due to their black-box nature. To gain a deeper understanding of stress fluctuations, and ultimately predict them in a physics-informed manner, it is necessary to examine how system energetics change with stress fluctuations. In this paper, we analyze stress fluctuations in a 2D granular fault gouge loaded under quasistatic, steady-state shear. We track the flow of potential energy between force networks and understand how energy and force networks vary with stress rises and drops. We derive an analytical, dynamic force chain model from first principles to illustrate how interactions between force networks lead to the emergence of localized instability phenomena. Finally, we offer insights into how these localized instabilities ultimately enable shear stress fluctuations at the continuum scale.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148700","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}

引用次数: 0

Rayleigh surface waves of extremal elastic materials 极弹性材料的瑞利表面波

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-08-30 DOI: 10.1016/j.jmps.2024.105842

{"title":"Rayleigh surface waves of extremal elastic materials","authors":"","doi":"10.1016/j.jmps.2024.105842","DOIUrl":"10.1016/j.jmps.2024.105842","url":null,"abstract":"<div><p>Extremal elastic materials here refer to a specific class of elastic materials whose elastic matrices exhibit one or more zero eigenvalues, resulting in soft deformation modes that, in principle, cost no energy. They can be approximated through artificially designed solid microstructures. Extremal elastic materials have exotic bulk wave properties unavailable with conventional solids due to the soft modes, offering unprecedented opportunities for manipulating bulk waves, e.g., acting as phonon polarizers for elastic waves or invisibility cloaks for underwater acoustic waves. Despite their potential, Rayleigh surface waves, crucially linked to bulk wave behaviors of such extremal elastic materials, have largely remained unexplored so far. In this paper, we theoretically investigate the propagation of Rayleigh waves in extremal elastic materials based on continuum theory and verify our findings with designed microstructure metamaterials based on pantographic structures. Dispersion relations and polarizations of Rayleigh waves in extremal elastic materials are derived, and the impact of higher order gradient effects is also investigated by using strain gradient theory. This study provides a continuum model for exploring surface waves in extremal elastic materials and may stimulate applications of extremal elastic materials for controlling surface waves.</p></div>","PeriodicalId":17331,"journal":{"name":"Journal of The Mechanics and Physics of Solids","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022509624003089/pdfft?md5=81d7545c5ffbaa5150c1e14ff951b52a&pid=1-s2.0-S0022509624003089-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A generalized strain model for spectral rate-dependent constitutive equation of transversely isotropic electro-viscoelastic solids 横向各向同性电-粘弹性固体的频谱速率构成方程的广义应变模型

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-08-30 DOI: 10.1016/j.jmps.2024.105838

引用次数: 0

Recovering Mullins damage hyperelastic behaviour with physics augmented neural networks 利用物理增强神经网络恢复穆林斯损伤超弹性行为

IF 5 2区工程技术

Journal of The Mechanics and Physics of Solids Pub Date : 2024-08-29 DOI: 10.1016/j.jmps.2024.105839

引用次数: 0