The nonlinear thermo-hyperelasticity wave propagation analysis of near-incompressible functionally graded medium under mechanical and thermal loadings

Shakeriaski, Farshad; Ghodrat, Maryam; Escobedo-Diaz, Juan P.; Behnia, Masud

doi:10.1007/s00419-021-01951-z

Cited by 10 publications

(8 citation statements)

References 37 publications

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“…In this section, the main goal is to study the wave propagation phenomenon and to understand the effects of mechanical loading rate on this phenomenon. To show the wave behavior well, the input function is selected as either a step function or an exponential function [14,28,37,46]. Here, the input function is considered as an exponential function (in form of an input shock) to easily launch a wave in the medium which is consistent with the previous study [14,28,37].…”

Section: The Effects Of Mechanical Shock Rate On the Thermoelastic Wa...mentioning

confidence: 77%

“…Hence, the results for different phase lags are expressed and then compared. Equation (20) presents the input loading and other boundary conditions are considered as equation (21) [28,46]:…”

Section: The Nonlinear Thermomechanical Responses Of Porous Medium Su...mentioning

confidence: 99%

“…As a consequence, the authors localized the boundary conditions using Pade estimation, leading to quicker computations. Other recent studies in the field of generalized thermoelasticity can be found in the [27][28][29][30]. These studies present the nonlinear responses of elastic mediums under thermomechanical loading.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Effects Of Mechanical Shock Rate On the Thermoelastic Wa...mentioning

confidence: 77%

Section: The Nonlinear Thermomechanical Responses Of Porous Medium Su...mentioning

confidence: 99%

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

Shakeriaski¹,

Salehi²,

Ghodrat³

2021

Phys. Scr.

Self Cite

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“…Here the n and n + 1 subscripts related to the starting and finish time instants of the current time step. An updating iterations would be needed to combine the computed displacement and temperatures [41].This iteration continues until obtaining an allowable value satisfying the defined Picard's iterative standards:…”

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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“…41,42 In recent decades, the thermophysiological effects of personal protective devices on firefighters have been investigated and analyzed in the laboratories. 43 Higher heat load can pose thermal stress, [44][45][46][47] leading to thermal exhaustion, loss of consciousness, physical fatigue, mental confusion, and dehydration influencing danger perception and productivity. To control and avoid thermal shock in firefighters, a continuous and reliable temperature sensor that is capable of assessing the real-time core temperature of firefighters' body is necessary.…”

Section: Sensor Fabrication and Their Essentialsmentioning

confidence: 99%

Challenges and limitation of wearable sensors used in firefighters’ protective clothing

Shakeriaski

Ghodrat

2022

Journal of Fire Sciences

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This review aims to present recent improvements and existing challenges in the design of wearable sensors used in the firefighters’ protective clothing. Wearable sensors are generally used directly on the body or placed on wearable items to monitor data for the safety of firefighters. Recently, wearable sensors have attracted much attention from researchers and experts. Most investigations have addressed novel designs for wearable sensors to enhance firefighters’ safety measures and reduce the risk of exposure to fires. This article is an attempt to review design limitations of wearable sensors for future developments and improve existing shortcomings. The growing body of knowledge focused on the application of wearable technology to monitor firefighters’ activity, health, and body temperature. In the following, we have discussed the trials of the design of the existing sensors. Finally, moisture and radiation as common exterior parameters in fire events are discussed which received less attention and have major impact on the performance of firefighters’ wearable sensors.

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The nonlinear thermo-hyperelasticity wave propagation analysis of near-incompressible functionally graded medium under mechanical and thermal loadings

Cited by 10 publications

References 37 publications

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

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

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

Challenges and limitation of wearable sensors used in firefighters’ protective clothing

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