Mechanics of Time-Dependent Materials最新文献_第10页

The effect of transverse isotropy on the creep behavior of bedded salt under confining pressures 横向各向同性对层状盐在约束压力下蠕变行为的影响

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-04-17 DOI: 10.1007/s11043-024-09695-3

Kanya Kraipru, Kittitep Fuenkajorn, Thanittha Thongprapha

{"title":"The effect of transverse isotropy on the creep behavior of bedded salt under confining pressures","authors":"Kanya Kraipru, Kittitep Fuenkajorn, Thanittha Thongprapha","doi":"10.1007/s11043-024-09695-3","DOIUrl":"10.1007/s11043-024-09695-3","url":null,"abstract":"<div>In this paper, we investigate the role of transverse isotropy on the creep behavior of bedded salt. We conducted a series of triaxial creep tests on prismatic specimens subjected to confining pressures ((sigma _{3})) of up to 24 MPa and a constant octahedral shear stress ((tau _{mathrm{o}})) of 9 MPa. The specimens were oriented with their bedding planes at various angles ((beta )) to the major principal axis to simulate transverse isotropic conditions. Our findings reveal that both instantaneous and creep deformations are most significant when (beta = 0^{circ }), decreasing progressively to a minimum at (beta = 90^{circ }) across all confining pressures. The discrepancy in deformations between these intrinsic angles narrows with increasing (sigma _{3}). Creep deformations for intermediate angles ((0^{circ} < beta < 90^{circ })) follow the elliptical equations. Utilizing the Burgers creep model, we observed that the instantaneous, viscoelastic moduli, and viscoplastic coefficients escalate with (beta ). The degree of anisotropy declines sharply as confining pressures increase, reaching an isotropic state under (tau _{mathrm{o}} = 9text{ MPa}) and (sigma _{3}) around 40 MPa, beyond which transient creep ceases, indicating a transition to Maxwell-material behavior. Employing linear viscoelastic theory, we derived an equation for time-dependent deformation under varying octahedral shear stresses. This enables the formulation of governing equations for Burgers-model parameters, considering bedding plane orientations, loading durations, and the interactions between shear and confining stresses.</div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2879 - 2897"},"PeriodicalIF":2.1,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140610939","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

Assessment of the strength deterioration of a coal pillar using a strain-softening time-dependent constitutive model 利用应变软化随时间变化的构成模型评估煤柱的强度劣化情况

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-04-16 DOI: 10.1007/s11043-024-09692-6

Prudhvi Raju Gadepaka, Sonu, Ashok Jaiswal

{"title":"Assessment of the strength deterioration of a coal pillar using a strain-softening time-dependent constitutive model","authors":"Prudhvi Raju Gadepaka,  Sonu, Ashok Jaiswal","doi":"10.1007/s11043-024-09692-6","DOIUrl":"10.1007/s11043-024-09692-6","url":null,"abstract":"<div>In this study, a time-dependent constitutive model of a coal pillar was developed using the Hoek–Brown strain-softening model, which is useful for studying the strength deterioration of a coal pillar over time. A database of 32 failed cases of coal pillars of different ages from the Witbank Coalfield has been utilized to deduce the strength parameters of the coal seam through back analysis. A three-dimensional finite-difference method (FDM) has been chosen to simulate the failed cases. The simulation results have been obtained in terms of pillar strength and FOS of the pillar concerning time. Based on the simulation results the life of the pillar is considered when FOS is nearly equal to 1. The appropriate strength parameters have been derived as peak strength parameters: (m_{i} = 1.47) and (s_{i} = 0.01); residual parameters: (m_{r} = 0.125) and (s_{r} = 0.00001); strength-reduction parameters: (alpha = 0.04), (beta = 200) for a coal mass. 39 stable cases from the same coalfields (Witbank) have been considered to validate the strength parameters. The simulation results of all the stable cases were showing FOS > 1. The proposed constitutive model is suitable for assessing a pillar’s time-dependent strength deterioration and creep behavior. The deterioration/yielding of the pillar is observed to be initiated from the skin/side, extending deeper into the pillar’s core with time and ultimately forming an hourglass shape. It is also observed that the FOS of the pillar decreases with time.</div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2841 - 2858"},"PeriodicalIF":2.1,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140563836","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

Higher-order heat conduction model in a rotating micropolar thermoelastic medium with moving heat source and electromagnetic field 带有移动热源和电磁场的旋转微极热弹性介质中的高阶热传导模型

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-04-12 DOI: 10.1007/s11043-024-09694-4

Sourov Roy, Abhijit Lahiri

引用次数: 0

Photothermoelastic response due to Hall current and gravity effects in a hyperbolic two-temperature semiconducting medium with voids under a moving thermal load 移动热负荷下带有空隙的双曲双温半导体介质中霍尔电流和重力效应引起的光热弹性响应

IF 2.5 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-04-08 DOI: 10.1007/s11043-024-09689-1

Mohit Kumar, Shilpa Chaudhary, Sandeep Singh Sheoran

{"title":"Photothermoelastic response due to Hall current and gravity effects in a hyperbolic two-temperature semiconducting medium with voids under a moving thermal load","authors":"Mohit Kumar, Shilpa Chaudhary, Sandeep Singh Sheoran","doi":"10.1007/s11043-024-09689-1","DOIUrl":"https://doi.org/10.1007/s11043-024-09689-1","url":null,"abstract":"Photothermal transport process and voids in solids are important phenomena in a variety of engineering approaches and scientific disciplines. For this purpose, the photothermal theory is being utilized to study the coupling between elastic waves and plasma waves in a semiconducting medium with voids. The basic governing equations for photothermal waves are derived in the framework of hyperbolic two-temperature theory and Green–Lindsay model. Normal mode analysis method is used to obtain the physical field distributions under investigation. A moving thermal load is applied at the outer free surface of the medium to obtain the complete solution. Expressions are calculated numerically for silicon (Si) material and presented to observe the variations of the field quantities. The effects of various key parameters on the physical fields are also shown graphically. Special cases that are consistent with the earlier findings have been obtained. Although, numerous studies do exist on the deformation analysis in a photothermoelastic medium under different thermoelasticity theories. However, no research emphasizing thermodynamical analysis of the photothermal transport process in a hyperbolic two-temperature semiconducting medium with voids under the influence of gravity and Hall current has been carried out. This provides us a motivation to study the current research. Chemical engineering, geophysics, earthquake engineering, soil dynamics, high-energy particle physics, nuclear fusion, aeronautic biomechanics, bone mechanics, and petroleum industry are the major application areas of the photothermolelasticity theory.","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"189 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140563605","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}

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Effects of dynamic loading and temperature on NEPE propellant: damage and ignition analysis 动态加载和温度对 NEPE 推进剂的影响：损伤和点火分析

IF 2.5 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-04-02 DOI: 10.1007/s11043-024-09684-6

Zongtao Guo, Jinsheng Xu, Xiong Chen, Tingyu Wang, Jiaming Liu, Hao Zhang, Yulin Chen, Qixuan Song

{"title":"Effects of dynamic loading and temperature on NEPE propellant: damage and ignition analysis","authors":"Zongtao Guo, Jinsheng Xu, Xiong Chen, Tingyu Wang, Jiaming Liu, Hao Zhang, Yulin Chen, Qixuan Song","doi":"10.1007/s11043-024-09684-6","DOIUrl":"https://doi.org/10.1007/s11043-024-09684-6","url":null,"abstract":"We investigate herein the thermo-mechanical behavior of nitrate ester plasticized polyether (NEPE) propellants under dynamic, nonshock loading scenarios, such as impacts and drops, which are vital for assessing the safety of solid rocket motors. Using a split Hopkinson pressure bar (SHPB) apparatus, we performed dynamic loading tests on NEPE propellant samples at high strain rates (4000, 5100, and 6000 s−1) and various temperatures (228, 298, and 318 K). High-speed cameras captured the deformation, fracture, ignition, and combustion stages under these conditions. Results indicate that both the mechanical properties and ignition behavior of the propellant are significantly affected by strain rate and temperature. The propellant demonstrated nonlinear elastic deformation, with both ultimate stress and strain increasing with strain rate and decreasing with temperature. During dynamic loading, samples underwent stages of uniform and nonuniform deformation, fragmentation, and for some, ignition, which was more prompt and intense at higher strain rates and temperatures. High-speed footage, along with optical and scanning electron microscopy, revealed friction among ammonium perchlorate particles as the primary ignition catalyst, presenting as shear flow on a macroscopic level. This investigation underscores the complex interplay between strain rate, temperature, and mechanical integrity in the safety and performance of high-energy propellants.","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"9 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140563597","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

Modeling the thermal behavior of functionally graded media with a spherical gap: rectified sine wave heating via fourth-order Moore–Gibson–Thompson model 带有球形间隙的功能分级介质热行为建模：通过四阶摩尔-吉布森-汤普森模型进行正弦波整流加热

IF 2.1 4区材料科学

Mechanics of Time-Dependent Materials Pub Date : 2024-03-28 DOI: 10.1007/s11043-024-09688-2

Ahmed E. Abouelregal, Marin Marin, Hind A. Alharbi, Khaled J. A. Alrouili

{"title":"Modeling the thermal behavior of functionally graded media with a spherical gap: rectified sine wave heating via fourth-order Moore–Gibson–Thompson model","authors":"Ahmed E. Abouelregal, Marin Marin, Hind A. Alharbi, Khaled J. A. Alrouili","doi":"10.1007/s11043-024-09688-2","DOIUrl":"10.1007/s11043-024-09688-2","url":null,"abstract":"<div>The main objective of this work is to introduce a new thermal conductivity model that can be utilized to solve the infinite thermal diffusion problem in the Green and Naghdi type III model. This proposed model incorporates two key concepts: the fourth-order Moore–Gibson–Thompson (MGT) concept and thermal relaxation. By incorporating higher-order terms, the fourth-order MGT model provides a more accurate representation of the thermal behavior of the material. The thermal behavior of a functionally graded (FG) infinite medium containing a spherical gap is then studied using this model. A rectified sine wave heating system is applied to the traction-free gap surface. Power functions are utilized to model the uniform radial variation of the physical properties of the FG medium. The physical variables under investigation were meticulously examined, considering the impacts of heterogeneity, relaxation duration, and thermal frequency. These variables were estimated numerically using a suitable technique for Laplace transformations. Through this work, the expected outcomes may be able to make a significant contribution to the field of thermoelastic analysis in advanced and FG materials, as well as to engineering applications.</div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 3","pages":"681 - 707"},"PeriodicalIF":2.1,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140324531","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

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>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: (g*(tau ) = g_{0}(1+acos (pi omega {t}))), 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 ((M)) and Casson (beta ) 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 (15%) as compared to mono- and trihybrid nanofluids and (5%) when comparing bihybrid cases with trihybrid cases. Furthermore, the shear stress and Nusselt number are enhanced against increasing amplitude modulation.</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>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.</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>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.</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