Continuum Mechanics and Thermodynamics最新文献_第3页

Love wave scattering by an interface crack between an orthotropic layer and an isotropic half-space 正交各向同性层与各向同性半空间间界面裂纹对Love波的散射

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-03-10 DOI: 10.1007/s00161-025-01375-y

Sourav Kumar Panja, Samim Alam, Subhas Chandra Mandal, Eduard-Marius Craciun

{"title":"Love wave scattering by an interface crack between an orthotropic layer and an isotropic half-space","authors":"Sourav Kumar Panja, Samim Alam, Subhas Chandra Mandal, Eduard-Marius Craciun","doi":"10.1007/s00161-025-01375-y","DOIUrl":"10.1007/s00161-025-01375-y","url":null,"abstract":"<div><p>This research investigates the scattering behavior of Love waves, also known as Q waves in seismology, induced by an interface crack between an orthotropic elastic layer and an isotropic elastic half-space where the orthotropic layer serves as a wave guide medium. The Dispersion relation and phase velocity have been obtained by using convenient boundary conditions for the Love wave propagation. Using the method of Fourier transform and integral equation, the study derives the conditions governing wave propagation and scattering phenomena in the interfaced medium. The expression of the most important fracture quantities, such as dynamic stress intensity factor (DSIF) and crack opening displacement (COD) have been obtained and demonstrated graphically. Results demonstrate the dependence of scattering characteristics on the material properties, crack dimensions, layer height and wave frequencies. The findings contribute to a deeper understanding of Love wave propagation in composite materials, with implications for non-destructive testing and evaluation of structural integrity in engineering applications.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00161-025-01375-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583628","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

Research on multi-oscillator locally resonant seismic metamaterials and the uniform and gradient design for broadband Rayleigh wave attenuation 多振子局部共振地震超材料研究及宽带瑞利波衰减均匀梯度设计

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-03-09 DOI: 10.1007/s00161-025-01368-x

Weikai Xu, Hongyang Sun, Hong Hai, Wei Wang, Chunli Zhou

{"title":"Research on multi-oscillator locally resonant seismic metamaterials and the uniform and gradient design for broadband Rayleigh wave attenuation","authors":"Weikai Xu, Hongyang Sun, Hong Hai, Wei Wang, Chunli Zhou","doi":"10.1007/s00161-025-01368-x","DOIUrl":"10.1007/s00161-025-01368-x","url":null,"abstract":"<div><p>The dimensions of seismic metamaterials pose limitations that make attenuating ultra-low frequency seismic surface waves (with a starting frequency near 0 Hz) in confined spaces through structural design a significant challenge. This paper introduces a locally resonant seismic metamaterial (SM) characterized by an ultra-low frequency wide bandgap, created by placing a nylon barrier embedded with steel oscillators between two steel plates. The bandgap is calculated using dispersion analysis and phononic crystals method, delineating the attenuation range of the seismic metamaterial. Parameter analysis results show that greater oscillator mass, thinner nylon barrier thickness, and higher external barrier height favor broader bandgap width and reduced bandgap frequency. By introducing the concept of multiple oscillators and “uniform and gradient,” the isolation performance of the SM is significantly enhanced, while the impact of the Fano-like phenomenon on attenuation is simultaneously reduced. This indicates that multi-oscillator and “uniform and gradient” are ideal solutions for opening ultra-low frequency bandgaps. Finally, the dynamic response of the SM is clarified through time-domain analysis, further validating the effectiveness of the research. We hope that this study can promote the engineering application of common building materials in the shielding of deep subwave length frequency seismic waves.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576276","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

Viscoelastic bidispersive convection with a Kelvin–Voigt fluid 开尔文-沃伊特流体的粘弹性双色散对流

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-03-08 DOI: 10.1007/s00161-025-01372-1

Franca Franchi, Roberta Nibbi, Brian Straughan

引用次数: 0

A method of stress analysis for a class of piece-wise smooth yield criteria under axial symmetry 轴对称条件下一类分段光滑屈服准则的应力分析方法

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-03-07 DOI: 10.1007/s00161-025-01367-y

Sergei Alexandrov, Vyacheslav Mokryakov, Yeau-Ren Jeng

{"title":"A method of stress analysis for a class of piece-wise smooth yield criteria under axial symmetry","authors":"Sergei Alexandrov, Vyacheslav Mokryakov, Yeau-Ren Jeng","doi":"10.1007/s00161-025-01367-y","DOIUrl":"10.1007/s00161-025-01367-y","url":null,"abstract":"<div><p>This paper concerns the general axisymmetric problem in plasticity in conjunction with the hypothesis of Haar and von Karman for calculating stress fields. No other restriction is imposed on the yield criterion. The stress equations comprising the yield criterion and the equilibrium equations without body forces are statically determined in the sense that there are four equations involving only the four components of stress. Therefore, the result of the present paper is independent of the plastic flow rule. It is also immaterial whether elastic strains are included. It is shown that the problem above reduces to a purely geometric problem of determining an orthogonal coordinate system whose scale factors satisfy a parametric equation. Any orthogonal net satisfying this equation determines a net of principal stress trajectories giving a solution to the stress equations. The general method applies to finding the specific equations for several widely used yield criteria. Characteristic analysis of the equations that describe the mapping between the principal line coordinate system and a cylindrical coordinate system is performed. A numerical scheme based on the method of characteristics is developed and employed for calculating the stress field near a rotational ellipsoid whose surface is traction-free.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143569630","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

Asymptotic long-wave model for an elastic isotropic nanoplate with surface effects derived from the 3D theory of elasticity and its comparison with hypotheses-based models 基于三维弹性理论的具有表面效应的弹性各向同性纳米板渐近长波模型及其与假设模型的比较

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-03-05 DOI: 10.1007/s00161-025-01366-z

Gennadi I. Mikhasev

{"title":"Asymptotic long-wave model for an elastic isotropic nanoplate with surface effects derived from the 3D theory of elasticity and its comparison with hypotheses-based models","authors":"Gennadi I. Mikhasev","doi":"10.1007/s00161-025-01366-z","DOIUrl":"10.1007/s00161-025-01366-z","url":null,"abstract":"<div><p>The paper deals with the derivation of asymptotically correct equations governing the long-wave bending response of a rectangular ultrathin elastic isotropic plate taking into account surface effects within the framework of the Gurtin-Murdoch theory of surface elasticity. The upper and lower faces are assumed to be pre-stressed by residual surface stresses which can be either tensile or compressive. The original 3D equations of elasticity are split into equations corresponding to the in-plane boundary layer and equations predicting out-of-plane bending deformation. By performing asymptotic integration through the thickness of the 3D equations associated with bending deformations and satisfying the balance equations on both faces, we derive asymptotically correct relations for displacements and stresses, as well as a new Timoshenko-type equation capturing surface stresses and inertia. A comparative analysis of the derived governing equation with similar available equations based on kinematic hypotheses revealed significant differences in the effective bending stiffness and factors of the inertia term. As examples, we studied free low-frequency vibrations and self-buckling of a square nanoplates made of different materials and compared effects of residual stresses on the natural frequencies and the critical value of the plate side using the novel model and the models relying on hypotheses for the normal component of the stress tensor.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553945","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

Electrodynamics and geometric continuum mechanics 电动力学和几何连续介质力学

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-02-17 DOI: 10.1007/s00161-025-01364-1

Reuven Segev

引用次数: 0

Variational modeling of multilayer films with coherent and incoherent interlayer interfaces 具有相干和非相干层间界面的多层膜的变分建模

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-02-14 DOI: 10.1007/s00161-025-01361-4

Randy Llerena, Paolo Piovano

{"title":"Variational modeling of multilayer films with coherent and incoherent interlayer interfaces","authors":"Randy Llerena, Paolo Piovano","doi":"10.1007/s00161-025-01361-4","DOIUrl":"10.1007/s00161-025-01361-4","url":null,"abstract":"<div><p>A novel variational model is proposed to address design control for composite multilayered metamaterials self-assembled via vapor deposition. The model is formulated within the framework of continuum mechanics, with the reference configuration corresponding to the equilibrium lattice of the substrate material. To account for the potential mismatch with the free-standing equilibrium lattices of each layer’s material, following the literature on Stress-Driven Rearrangement Instabilities, a nonzero mismatch strain varying across layers is considered. Moreover, building on the results of [47], the model allows for the treatment of the interplay between coherent and incoherent regions, which can coexist at each interlayer interface, as both elastic and surface effects—and their competition—are taken into account. The surface of each film layer is assumed to satisfy the“exterior graph condition” introduced in [47], which allows bulk cracks to be of non-graph type. By applying the direct method of calculus of variations under a constraint on the number of connected components of the cracks that are not connected to the surface of the film layers, the existence of energy minimizers is established in two dimensions. As a byproduct of the analysis, advancements are also made in the state of the art in the variational modeling of single-layered films by allowing the substrate surface to be free and including the possibility of delamination from the substrate.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00161-025-01361-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404184","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

Thermoelastic modeling of functionally graded materials with cylindrical cavities utilizing higher-order fractional heat transfer models incorporating time delays 利用含时滞的高阶分数传热模型对具有圆柱腔的功能梯度材料进行热弹性建模

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-02-10 DOI: 10.1007/s00161-025-01360-5

Ahmed E. Abouelregal, Mohamed E. Elzayady, M. Marin, Abdelaziz Foul, Sameh S. Askar

{"title":"Thermoelastic modeling of functionally graded materials with cylindrical cavities utilizing higher-order fractional heat transfer models incorporating time delays","authors":"Ahmed E. Abouelregal, Mohamed E. Elzayady, M. Marin, Abdelaziz Foul, Sameh S. Askar","doi":"10.1007/s00161-025-01360-5","DOIUrl":"10.1007/s00161-025-01360-5","url":null,"abstract":"<div><p>This article examined the thermoelastic behavior of functionally graded (FG) materials using a partially modified thermoelastic heat transfer model. The model utilized the three-phase lag thermoelasticity theory and incorporated higher-order fractional derivatives of Caputo and Fabrizio to address advanced thermodynamic and mechanical properties. These improvements showed great potential for applications in engineering fields such as aerospace, pressure vessel design, and structural engineering. The study applied the proposed model to analyze a thermoelastic problem involving an infinite FG medium with a cylindrical cavity subjected to thermal shock. The medium’s radially varying thermal and mechanical properties, characteristic of FG materials, played a central role in the analysis. The results revealed that the gradient coefficient and fractional derivative coefficient significantly affected the distribution of physical fields within the medium. Adjusting these parameters optimized the thermoelastic response, enabling tailored performance to meet specific engineering requirements.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379846","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 the influence of thermal contact conduction on the intensity of heat flow in a bundle of round steel bars 热接触传导对圆钢筋束内热流强度的影响分析

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-02-05 DOI: 10.1007/s00161-025-01363-2

Rafał Wyczółkowski, Mariusz Salwin, Marek Gała, Dominika Strycharska, Tomasz Chmielewski

{"title":"Analysis of the influence of thermal contact conduction on the intensity of heat flow in a bundle of round steel bars","authors":"Rafał Wyczółkowski, Mariusz Salwin, Marek Gała, Dominika Strycharska, Tomasz Chmielewski","doi":"10.1007/s00161-025-01363-2","DOIUrl":"10.1007/s00161-025-01363-2","url":null,"abstract":"<div><p>The article analyzes the impact of contact conduction on the intensity of heat flow in a bundle of steel round bars. This issue is related to the optimization of the heat treatment of the bars, as contact conduction is a key mechanism in the heating process of the considered charge. A proprietary computational model, based on the analysis of thermal resistances, was used for the analysis. To quantify heat flow intensity in the bar bundle, the concept of effective thermal conductivity was utilized. The impact of contact conduction on the phenomenon under consideration was expressed using a parameter called the multiplication of effective thermal conductivity (<span>({M}_{ ETC}))</span>, defined by Eq. (36). Calculations were conducted across a temperature range of 25–800 °C, considering variables such as bar diameters (10, 20, and 30 mm), bundle porosity, and type of gas (air and hydrogen). Results indicate that temperature has the greatest influence on the course of the analyzed phenomenon, as this parameter increases, the influence of contact conduction decreases rapidly. Across the entire temperature range, contact conduction increases heat transfer intensity by approximately: four times (for air) and twice (for hydrogen).</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184813","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

Experimental study of fluid displacement and viscous fingering in fractured porous media: effect of viscosity ratio 裂缝性多孔介质中流体位移与粘性指动的实验研究：粘度比的影响

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2025-02-04 DOI: 10.1007/s00161-025-01362-3

Amirhosein Zadehkabir, Pouria Mazinani, Behrouz Zare Vamerzani, Christian Cardillo, Hamid Saffari, Seyed Mostafa Hosseinalipour

{"title":"Experimental study of fluid displacement and viscous fingering in fractured porous media: effect of viscosity ratio","authors":"Amirhosein Zadehkabir, Pouria Mazinani, Behrouz Zare Vamerzani, Christian Cardillo, Hamid Saffari, Seyed Mostafa Hosseinalipour","doi":"10.1007/s00161-025-01362-3","DOIUrl":"10.1007/s00161-025-01362-3","url":null,"abstract":"<div><p>Viscous fingering instability has been analyzed through empirical studies using miscible flow displacement in fractured porous media. While significant research has been conducted on viscous fingering, limited information is available regarding its behavior in fractured porous structures. The experiments were conducted in rectangular porous models with fractures oriented at <span>({0}^circ )</span>, <span>({45}^circ )</span>, and <span>({90}^circ )</span>, to investigate how fracture orientation influences fluid displacement, where both channeling and fingering mechanisms play significant roles. This paper, which is the second part of a previous study, places particular emphasis on the impact of the viscosity ratio, a crucial parameter in determining the complexity of the fingering patterns. Quantitative parameters such as sweep efficiency, tip location, and breakthrough time were evaluated and analyzed using image processing techniques. The results indicate that increasing the viscosity ratio leads to more complex finger formations. Additionally, as the injection rate increases, the size of the finger patterns slightly increases, while the channeling effect becomes less pronounced. Notably, fractures aligned at <span>({0}^circ )</span> had the most significant impact on the rate of sweep efficiency and tip location, increasing the tip velocity of the fingers by up to 90%.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 2","pages":""},"PeriodicalIF":1.9,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00161-025-01362-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083897","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