Mechanics of Time-Dependent Materials最新文献_第6页

Significance of trihybrid nanoparticles in non-Newtonian fluids: a finite-element simulation of magnetohydrodynamic effects under microgravity conditions 非牛顿流体中三杂纳米粒子的意义：微重力条件下磁流体动力学效应的有限元模拟

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-28 DOI: 10.1007/s11043-024-09686-4

Bagh Ali, Imran Siddique, Sonia Majeed, Windarto, Tarik Lamoudan, Shahid Ali Khan

{"title":"Significance of trihybrid nanoparticles in non-Newtonian fluids: a finite-element simulation of magnetohydrodynamic effects under microgravity conditions","authors":"Bagh Ali, Imran Siddique, Sonia Majeed,  Windarto, Tarik Lamoudan, Shahid Ali Khan","doi":"10.1007/s11043-024-09686-4","DOIUrl":"10.1007/s11043-024-09686-4","url":null,"abstract":"<div><p>This study examines the dynamics of the three different fluid types, mono-, di-, and trihybrid nanofluids, emphasizing the distinction between the three types of fluids. Also, the report highlights the significance of the microgravity environment: <span>(g*(tau ) = g_{0}(1+acos (pi omega {t})))</span>, and a gravitational field plus a temperature gradient typically produce buoyant convective flows in a variety of different situations, most likely in environments of low gravity or microgravity. One of the reasons for the growing interest in trihybrid nanofluids is their unique ability to improve thermal performance, which is really useful in various heat exchangers. The leading governing equations of linear momentum and energy of the developed problem are transmuted into nondimensional nonlinear coupled PDEs by using appropriate similarity modifications. The obtained systems of partial differential equations are solved via the finite-element method (FEM) in a MATLAB environment. The FEM is the most reliable, powerful, efficient, and fast convergence rate technique. The fluid velocity decreases as a function of the increasing strength of the magnetic (<span>(M)</span>) and Casson <span>(beta )</span> parameters. However, the temperature distribution increases as a function of these parameters. It is observed that both temperature and velocity functions for trihybrid nanofluid flow obtain peak values as compared to mono- and bihybrid cases. The Nusselt number exhibits an increasing behavior by <span>(15%)</span> as compared to mono- and trihybrid nanofluids and <span>(5%)</span> when comparing bihybrid cases with trihybrid cases. Furthermore, the shear stress and Nusselt number are enhanced against increasing amplitude modulation.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"1331 - 1348"},"PeriodicalIF":2.1,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Nonlocal and micropolar effects in a transversely isotropic functionally graded thermoelastic solid under an inclined load 倾斜载荷下横向各向同性功能梯度热弹性固体中的非局部效应和微极性效应

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-28 DOI: 10.1007/s11043-024-09687-3

Priti Dhankhar, M. S. Barak, Ravinder Poonia

引用次数: 0

Thermo-mechanical waves in a biological tissue under ramp and oscillatory heat in Atangana–Baleanu fractional theory 阿坦加纳-巴列阿努分式理论中生物组织在斜坡和振荡热作用下的热机械波

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-25 DOI: 10.1007/s11043-024-09685-5

Rakhi Tiwari

{"title":"Thermo-mechanical waves in a biological tissue under ramp and oscillatory heat in Atangana–Baleanu fractional theory","authors":"Rakhi Tiwari","doi":"10.1007/s11043-024-09685-5","DOIUrl":"10.1007/s11043-024-09685-5","url":null,"abstract":"<div><p>Accurate outcome prediction in a thermal treatment of a biological tissue is challenging for the medical practitioners. This paper makes an attempt to predict the outcomes using fractional modelling of the heat transfer. The model has the capability to describe the characteristics in the transient heat transport in a biological tissue. A novel heat transfer model is established with two relaxation times in the Atangana and Baleanu fractional derivatives. A comparison of the thermo-mechanical waves originated inside the skin tissue was made for the ramp and harmonic heat. Laplace transform is performed to obtain the analytical solution of dimensionless temperature, dilation, displacement, and thermal stress. Effects of the fractional parameters and the time are evaluated through the graphical results for both types of heat input. Auspicious outcomes are noticed for the different thermal loadings. Results under sinusoidal heat are observed to be stable compared to the results under ramp heat. Moreover, graphical results of the physical quantities under Atangana–Baleanu fractional model are compared with the results for the conventional dual phase lag model having integer-order derivatives. Results under fractional theory provide compressed values of the physical fields and prevent the damage formation inside the tissue. The paper provides a technique suitable for outcome prediction by medical practitioners in thermal therapy for diseases such as cancer and hyperthermia.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"1719 - 1741"},"PeriodicalIF":2.1,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140298146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Characterization and modeling of the uniaxial thermo-mechanical compressive behavior of polymethacrylimide (PMI) foam at different temperatures 聚甲基丙烯酰亚胺（PMI）泡沫在不同温度下的单轴热机械压缩行为的表征与建模

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-18 DOI: 10.1007/s11043-024-09671-x

Guotao Chen, Yansong Lv, Zhiyuan Mei, Huadong Li, Xuefei Bai

{"title":"Characterization and modeling of the uniaxial thermo-mechanical compressive behavior of polymethacrylimide (PMI) foam at different temperatures","authors":"Guotao Chen, Yansong Lv, Zhiyuan Mei, Huadong Li, Xuefei Bai","doi":"10.1007/s11043-024-09671-x","DOIUrl":"10.1007/s11043-024-09671-x","url":null,"abstract":"<div><p>This paper investigates the uniaxial compressive failure behavior of polymethacrylimide (PMI) foam across a range of temperatures (20 °C–200 °C), at both macro- and microscales. The investigation includes dynamic mechanical analysis and dimensional stability tests to evaluate the material’s heat resistance. The stress–strain curve of PMI foam under varying compressive failure mechanisms was analyzed, utilizing the Liu–Subhash model for accurate prediction of the material’s stress–strain constitutive relationship at different temperatures. The results indicate that between 20 °C and 180 °C, PMI foam behaves as an elastoplastic material, displaying a “three-stage” pattern in its stress–strain curve. At 200 °C, the material transitions to a hyperelastic incompressible state, evidenced by a “two-stage” stress–strain pattern. The paper also determines how temperature affects yield strength and elastic modulus, as well as the influence of strain rate at different temperatures. A quasi-static compression constitutive model for PMI foam, considering temperature effects, was modified from the Liu–Subhash model. These findings offer crucial theoretical support and data for understanding the thermo-mechanical bearing mechanism in composite sandwich structures.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2729 - 2749"},"PeriodicalIF":2.1,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140173122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Creep behavior and damage constitutive model of sandstone: an experimental study on seepage-load coupling 砂岩的蠕变行为和损伤构成模型：渗流-荷载耦合实验研究

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-15 DOI: 10.1007/s11043-024-09681-9

Yongqi Li, Yang Song, Da Huang

{"title":"Creep behavior and damage constitutive model of sandstone: an experimental study on seepage-load coupling","authors":"Yongqi Li, Yang Song, Da Huang","doi":"10.1007/s11043-024-09681-9","DOIUrl":"10.1007/s11043-024-09681-9","url":null,"abstract":"<div><p>Triaxial creep tests of sandstone under different seepage pressures were carried out to research the effect of seepage on the rheological laws of sandstone. The effect of seepage pressure on the rheological properties of rocks is investigated by analyzing the creep deformation, creep rate and permeability of sandstones. The creep rate curve is related to the seepage pressure and the axial load level. At a constant load level, the change in the creep curve mainly shows a trend of rapid decline, followed by stability for a long time, and finally a rapid increase under the next load level, which is linked to the variables of axial strain, radial strain, and volumetric strain of the sandstone. Permeability, which can reflect the hydration effect of rocks, exhibits a typical three-phase characteristic under seepage pressure: decreasing phase, a steady phase, and an increasing phase. For the damage creep model, firstly, the traditional Nishihara model is modified based on the fractional order theory, and the coupling model reflecting the whole creep process of sandstone is obtained by connecting the acceleration elements describing the accelerating phase of the rock in series, and finally, it is shown through the validation that the model can describe the whole creep process of sandstone under the seepage pressure. This study can provide theoretical support for the stability analysis of slope engineering under seepage conditions.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2751 - 2770"},"PeriodicalIF":2.1,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140151940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Characterization of multi-step creep behavior and fractional derivative modeling for a water-saturated coal 水饱和煤的多步蠕变行为特征和分数导数模型

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-12 DOI: 10.1007/s11043-024-09683-7

Lujun Wang, Jianchao Cheng, Huan Yang, Yi Yang, Yang Wu, Zhen Jia, Yong Zhang, Dongjie Xue

{"title":"Characterization of multi-step creep behavior and fractional derivative modeling for a water-saturated coal","authors":"Lujun Wang, Jianchao Cheng, Huan Yang, Yi Yang, Yang Wu, Zhen Jia, Yong Zhang, Dongjie Xue","doi":"10.1007/s11043-024-09683-7","DOIUrl":"10.1007/s11043-024-09683-7","url":null,"abstract":"<div><p>The long-term stability of coal pillars affected by cyclic dry-saturation state faces serious challenge in the normal operation of underground reservoirs in coal mines. The time-dependent deformation of coal is often controlled by the combined effects of mining disturbance, pressure- relief, dry and saturated cycles, etc. Tri-axial creep tests of coal samples were performed under stepped deviatoric stress paths including increasing axial pressure (AP) and decreasing confining pressure (CP). In addition, a fractional derivative creep model considering long-term strength is proposed to describe multi-step creep deformation. It was found that the saturation state has little effect on the peak deviatoric stress in the CP-unloading creep. In analyzing the creep strain, the tangent method can accurately distinguish transition boundary between the deceleration creep and the constant-velocity creep, and the statistical averaging method provides a large time scale for grasping the whole behavior of creep deformation. Finally, the long-term strengths of dry-saturated coal are obtained by the isochronous deviatoric stress–circumferential strain curve cluster. The proposed fractional derivative creep model is suitable for the CP-unloading creep test and can describe the multi-step creep deformation and the transient deformation in stepped stages.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2771 - 2791"},"PeriodicalIF":2.1,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140116206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A modified Green–Naghdi fractional-order model for analyzing thermoelectric semispace heated by a moving heat source 用于分析由移动热源加热的热电半空间的改进型格林-纳格迪分数阶模型

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-08 DOI: 10.1007/s11043-024-09664-w

Abaker A. Hassaballa, Mohamed H. Hendy, Magdy A. Ezzat

{"title":"A modified Green–Naghdi fractional-order model for analyzing thermoelectric semispace heated by a moving heat source","authors":"Abaker A. Hassaballa, Mohamed H. Hendy, Magdy A. Ezzat","doi":"10.1007/s11043-024-09664-w","DOIUrl":"10.1007/s11043-024-09664-w","url":null,"abstract":"<div><p>The classical Green–Naghdi (GN-II) model encounters challenges in accurately describing the thermo-mechanical behavior of electro-thermoelastic materials; in particular, the model does not consider the memory effect. To address this, a novel mathematical model of the Green–Naghdi (GN-II) theory is developed, incorporating a fractional order of heat transfer. This enhanced model offers a more comprehensive understanding by including several theories as limiting examples. Central to this approach is the use of the matrix exponential method, foundational to the state-space approach in modern theory. Additionally, the Laplace transform is employed to facilitate the model formulation. This formulation is applied to a specific half-space problem, which involves exposure to a uniform magnetic field and heating by a moving heat source at a constant speed. For the practical application of this model, a numerical method is utilized for the inverse Laplace transform. The roles of various factors on the solution are examined, including the figure-of-merit quantity, speed of the heat source, fractional parameter, magnetic number, and thermal shock parameter. By exploring these variables the model provides a thorough understanding of the interaction between heat transfer and magnetic fields in electro-thermoelastic materials. This research represents a significant advancement in the modeling of electro-thermoelastic materials, offering a more accurate and comprehensive tool for predicting their behavior under varying thermal and magnetic conditions.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"1815 - 1837"},"PeriodicalIF":2.1,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Analysis of stress and deformation of an exponentially graded viscoelastic coated half plane under indentation by a rigid flat punch indenter tip 指数级粘弹性涂层半平面在刚性平冲压头尖端压入下的应力和变形分析

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-08 DOI: 10.1007/s11043-024-09682-8

İsa Çömez

引用次数: 0

Thermoelastic damping in micro/nano-plate vibrations: 3D modeling using modified couple stress theory and the Moore–Gibson–Thompson equation 微型/纳米板振动中的热弹性阻尼：利用修正耦合应力理论和摩尔-吉布森-汤普森方程进行三维建模

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-05 DOI: 10.1007/s11043-024-09680-w

Khalid Mujasam Batoo, Shaymaa Abed Hussein, Ehab Essam Aziz, Manal Morad Karim, Ayadh Al-khalidi, Ahmed Ahmed Ibrahim, Bouchaib Zazoum, Montather F. Ramadan, Jamal K. Abbas, Ahmed Elawady, Ghassan Fadhil Smaisim

{"title":"Thermoelastic damping in micro/nano-plate vibrations: 3D modeling using modified couple stress theory and the Moore–Gibson–Thompson equation","authors":"Khalid Mujasam Batoo, Shaymaa Abed Hussein, Ehab Essam Aziz, Manal Morad Karim, Ayadh Al-khalidi, Ahmed Ahmed Ibrahim, Bouchaib Zazoum, Montather F. Ramadan, Jamal K. Abbas, Ahmed Elawady, Ghassan Fadhil Smaisim","doi":"10.1007/s11043-024-09680-w","DOIUrl":"10.1007/s11043-024-09680-w","url":null,"abstract":"<div><p>This paper introduces a size-dependent model for evaluating thermoelastic damping (TED) in small-scaled rectangular plates, incorporating three-dimensional (3D) heat transfer. Utilizing the modified couple stress theory (MCST) and Moore–Gibson–Thompson (MGT) heat equation, we enhance the thermomechanical analysis accuracy in micro/nano-structures. The model employs MCST to derive size-dependent constitutive relations for rectangular plates, coupled with the MGT model for formulating the 3D heat conduction equation. This approach facilitates the analysis of the 3D temperature field and aids in defining TED using the energy loss method. Consequently, an analytical expression is developed to predict 3D TED in rectangular plate resonators, integrating characteristic MCST length and nonclassical MGT parameters. Comparative analyses with existing studies and a series of simulated numerical results are presented. These simulations primarily focus on contrasting the 3D model with conventional 1D models and examining the effects of implementing MCST and MGT models. Findings reveal that the proposed formulation significantly alters outcomes for very small and relatively thick plates compared to simpler models. This advancement in modeling provides a more precise understanding of TED in micro/nano-plate structures, offering vital insights for their optimal design and application in advanced technological fields.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"1787 - 1813"},"PeriodicalIF":2.1,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140034532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 generalized Kelvin chain-based model for an orthotropic viscoelastic material 基于广义开尔文链的正交粘弹性材料模型

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-01 DOI: 10.1007/s11043-024-09678-4

M. Trcala, P. Suchomelová, M. Bošanský, F. Hokeš, I. Němec

{"title":"The generalized Kelvin chain-based model for an orthotropic viscoelastic material","authors":"M. Trcala, P. Suchomelová, M. Bošanský, F. Hokeš, I. Němec","doi":"10.1007/s11043-024-09678-4","DOIUrl":"10.1007/s11043-024-09678-4","url":null,"abstract":"<div><p>We propose a constitutive material model to describe the rheological (viscoelastic) mechanical response of timber. The viscoelastic model is based on the generalized Kelvin chain applied to the orthotropic material and is compared to the simple approach given by standards. The contribution of this study consists of the algorithmization of the viscoelastic material model of the material applied to the orthotropic constitutive law and implementation into the FEM solver. In the next step, the fitting of the input parameters of the Kelvin chain is described, and at least a material model benchmark and comparison to the approach given by standards were done. The standardized approach is based on the reduction of the material rigidity at the end of the loading period using a creep coefficient, whereas the loading history state variables are not considered when establishing the result for a specific time step. The paper presents the benefits of the rheological model. It also demonstrates the fitting algorithm based on particle swarm optimization and the least squares method, which are essential for the use of the generalized Kelvin chain model. The material model based on the orthotropic generalized Kelvin chain was implemented into the FEM solver for the shell elements. This material model was validated on the presented benchmark tasks, and the influence of the time step size on the accuracy of model results was analyzed.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"1639 - 1659"},"PeriodicalIF":2.1,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11043-024-09678-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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