Nonlinear coupled thermoelastic analysis of thermal wave propagation in a functionally graded finite solid undergoing finite strain

Mirparizi, Mina; Fotuhi, Ali Reza; Shariyat, M.

doi:10.1007/s10973-019-08652-4

Cited by 25 publications

(10 citation statements)

References 37 publications

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“…The discretization of time space into small time periods is the principal feature of this process. In the present equations, time is expressed in the form of time step and n is the number of time increment [37]. Applying the second-order Taylor's expansion of Runge-Kutta, one may represent the nodal acceleration and speed vectors of the end of each time step in terms of the nodal unknown terms of the same time instant as [38][39][40]:…”

Section: Methods Of Solutionmentioning

confidence: 99%

Effect of loading rate on transient response of a nano scale medium based on continuum and thermal conduction nonlocal model

Mirparizi

Zhang

2022

Preprint

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Thermoelastic study at nano scale is an important matter along with the minimizing of the systems and intensive use of ultrafast lasers that size can influence on elastic deformation and thermal conduction grow. In this study, thermal and mechanical responses of nano-scaled body, exposed to thermal loads from outer supply and environment is inquired. In this research, nonlocal thermoelasticity model according to both nonlocal thermal conduction law and continuum theory is represented. A nonlinear finite element equation is applied to solve the coupled governing equations. It is considered that a nano scale medium is subjected to a sudden thermal shock. The results reveal some interesting aspects of wave propagation. The effects of thermal loading and loading rate on the wave propagation are discussed. The impact of the thermal and elastic nonlocality on wave dissemination is also shown graphically and discussed. Comparing the wave propagation characteristics of the classical and generalized thermoelasticity theories in the nonlocal models shows the superiorities of the proposed model. The maximum compressive stress may be observed at the wave front due to the resistance of the particles that are located ahead of the stress wave.

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Section: Methods Of Solutionmentioning

confidence: 99%

Effect of loading rate on transient response of a nano scale medium based on continuum and thermal conduction nonlocal model

Mirparizi

Zhang

2022

Preprint

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“…Also ρ, C, k, θ are density, specific thermal capacity, thermal conductivity and temperature. 34,35 The PCMs used in the test were mixed, therefore, there is not an accurate melting temperature; however, their melting point is fluctuated in the range of the substance melted. It is not possible to estimate and understand where and how much of the PCM is melting in the layer.…”

Section: Materials Used In In Intelligent Textile Coatingsmentioning

confidence: 99%

Smart coating in protective clothing for firefighters: An overview and recent improvements

Shakeriaski

Ghodrat

Rashidi

et al. 2022

Journal of Industrial Textiles

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Recently, new developments in the design and performance optimization of smart mechanisms associated with natural and man-made hazards have progressed considerably. This is mainly owing to advances in smart sensing mechanisms including communication and data technologies. This work provides a detailed overview of existing improvements on smart hazard monitoring equipment and materials applied in textile sensing systems. Given that fire is one of the most common disasters in many countries such as Australia, and every year many firefighters are affected by these unfortunate incidents, the focus of this study is on firefighters' protective clothing Fire Fighter Protective clothing. This review provides a unique opportunity to study smart sensing systems in coating technologies, potentially provides more effective techniques for training and better safety protocols of fire fighters. It aims to revisit the existing advances and address recent challenges and opportunities for improvement in the domain of smart coating and fire protective wearables. The goal of this review is to provide information about smart coating in protective clothing for firefighters. The capability of some of these clothing in managing thermal stresses, responding to humid environment, monitoring some critical parameters and adapting to the size of the wearers (clothes fabricated with phase change and shape memory substances) made them attractive choice in adjusting specific design features of industrial textiles. Various types of phase change and shape memory substances are defined and a combination of these substances within the structure of fabrics are presented. This paper also provides a detailed review on the heat exposure and capability of the shape memory substances (SMM) and phase change materials (PCM) to delay the heat transfer through fire fighter protective clothing. Referring to the former research, several issues have been detected using such substances. For instance, combination of phase change and shape memory materials needs fundamental improvements with regards to assessment techniques and testing criteria. Additionally, recent improvements in the domain of PCM and SMM including modifying mechanical features, functionality, and durability under different conditions have been informed. It has been suggested that the major problem in developing fabric-Phase Change Materials (PCMs) and Shape memory material (SMM) systems is their usage methods. At last recent developments on wearable monitoring systems applied in the firefighters’ protective gear. Wearable sensors are usually used directly on the body or located on wearable items to monitor information related to firefighters’ safety.

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“…The FE equations of a generalized thermoelasticity problem are conveniently derived by a standard process. In this technique, the temperature q and the displacement component w are associated with the corresponding nodal values [35,36]: where n is related to the number of nodes in an element and Y j ˆare introduced as the shape functions. Based on the standard Galerkin's process, the shape functions and weighting functions are expressed as:…”

Section: The Governing Equationsmentioning

confidence: 99%

“…To validate the model, the simulations results for an elastic medium are compared with the results presented in [35,45]. Table 1 presents the material properties considered for these cases.…”

Section: Model Validationmentioning

confidence: 99%

Modified G-L thermoelasticity theory for nonlinear longitudinal wave in a porous thermoelastic medium

Shakeriaski¹,

Salehi²,

Ghodrat³

2021

Phys. Scr.

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This paper presents a nonlinear analysis of the transient response of a porous medium affected by external traction. The formulation is presented based on a new modified G-L theory of thermoelasticity while temperature and strain rate parameters are included in the governing equations. Based on the finite strain theory (FST), the Lagrangian strain-displacement equation and Second Piola-Kirchhoff stress are applied to express the generalized form of thermoelasticity equations including large deformation. Both mechanical and thermal shocks are applied and finally, the effects of loading rate on transient response are discussed. An updated finite element method and Newmark's numerical time integration method are employed to solve the nonlinear and timedependent equations. It is determined that the modified G-L model is more powerful in predicting the wave propagation phenomenon. Furthermore, the findings indicate that the external surface shock induces compressive stresses, temperature raise, and volume fraction field increase in a porous medium. It is found compared to the classic model, the modified G-L model is superior in capturing the perceived wave propagation phenomenon.

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Nonlinear coupled thermoelastic analysis of thermal wave propagation in a functionally graded finite solid undergoing finite strain

Cited by 25 publications

References 37 publications

Effect of loading rate on transient response of a nano scale medium based on continuum and thermal conduction nonlocal model

Effect of loading rate on transient response of a nano scale medium based on continuum and thermal conduction nonlocal model

Smart coating in protective clothing for firefighters: An overview and recent improvements

Modified G-L thermoelasticity theory for nonlinear longitudinal wave in a porous thermoelastic medium

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