XFEM analysis of cracked media under thermal shock considering Chandrasekharaiah–Tzou theory

IF 1.9 3区 工程技术 Q3 MECHANICS
Vahid Jafari, Mohammad Bagher Nazari, Masoud Mahdizadeh Rokhi
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Abstract

In this paper, an isotropic environment with a static crack under thermal shock is studied using generalized thermoelasticity equations of Chandrasekharaiah–Tzou. The discretization of the governing equations in dimensionless space is done using the extended finite element method and the matrix form of the equations is extracted. Newmark’s method is used to solve the resulting system of nonlinear equations in the time domain. Some examples are solved using the numerical method and the temperature, displacements and stress fields along the length of the homogeneous layer are obtained. Also, the stress intensity factors under thermal shock are calculated using the interaction integral method and compared with the values obtained from the classical thermoelasticity theory. The results show that the speed of temperature, displacement and stress waves in the Chandrasekharaiah–Tzou theory are limited, unlike the classical thermoelasticity theory. Also, the maximum values of displacement and stress according to the theory of Chandrasekharaiah–Tzou occur at a smaller distance from the edge to which the thermal shock is applied.

Abstract Image

Abstract Image

考虑 Chandrasekharaiah-Tzou 理论的热冲击下裂纹介质 XFEM 分析
本文使用 Chandrasekharaiah-Tzou 的广义热弹性方程研究了热冲击下带有静态裂缝的各向同性环境。使用扩展有限元法对无量纲空间中的控制方程进行离散化,并提取方程的矩阵形式。纽马克方法用于求解由此产生的时域非线性方程组。使用数值方法求解了一些示例,得到了沿均质层长度方向的温度场、位移场和应力场。此外,还使用交互积分法计算了热冲击下的应力强度因子,并与经典热弹性理论得出的数值进行了比较。结果表明,与经典热弹性理论不同,Chandrasekharaiah-Tzou 理论中的温度波、位移波和应力波的速度是有限的。此外,根据 Chandrasekharaiah-Tzou 理论,位移和应力的最大值出现在距离施加热冲击的边缘较小的位置。
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来源期刊
Meccanica
Meccanica 物理-力学
CiteScore
4.70
自引率
3.70%
发文量
151
审稿时长
7 months
期刊介绍: Meccanica focuses on the methodological framework shared by mechanical scientists when addressing theoretical or applied problems. Original papers address various aspects of mechanical and mathematical modeling, of solution, as well as of analysis of system behavior. The journal explores fundamental and applications issues in established areas of mechanics research as well as in emerging fields; contemporary research on general mechanics, solid and structural mechanics, fluid mechanics, and mechanics of machines; interdisciplinary fields between mechanics and other mathematical and engineering sciences; interaction of mechanics with dynamical systems, advanced materials, control and computation; electromechanics; biomechanics. Articles include full length papers; topical overviews; brief notes; discussions and comments on published papers; book reviews; and an international calendar of conferences. Meccanica, the official journal of the Italian Association of Theoretical and Applied Mechanics, was established in 1966.
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