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首页> 外文期刊>Journal of thermal stresses >TRANSIENT THERMAL FRACTURE OF A PIEZOELECTRIC CYLINDER
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TRANSIENT THERMAL FRACTURE OF A PIEZOELECTRIC CYLINDER

机译:压电缸的瞬态热断裂

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摘要

This paper investigates the fracture mechanics problem of a piezoelectric cylinder under a sudden heating on its outer surface. The temperature field and the associated thermal stresses and electric displacements are obtained first. These stresses and electric displacements are added to the crack surface to form a mixed-mode boundary-value problem for the electromechanical coupling fracture. Both electrically impermeable and permeable crack-face boundary conditions are considered. An exact and closed-form solution for the thermally induced crack-tip field is obtained for infinitesimal cracking. Also obtained are the analytical expressions for the crack opening displacement and the electric displacement on the crack faces as a function of time. The maximum thermal stress and electric displacement inside the medium and the maximum thermal stress and electric displacement intensity factors near the crack border are given. These results are useful for the strength evaluation of piezoelectric materials under transient thermal environments.
机译:本文研究了压电圆柱体在外表面突然受热时的断裂力学问题。首先获得温度场以及相关的热应力和电位移。这些应力和电位移被添加到裂缝表面,以形成机电耦合断裂的混合模边界值问题。同时考虑了电渗透性和渗透性裂纹面边界条件。对于无限小裂纹,获得了一个热致裂纹尖端场的精确且封闭形式的解。还获得了裂纹开口位移和裂纹面上的电位移随时间变化的解析表达式。给出了介质内部的最大热应力和电位移以及裂纹边界附近的最大热应力和电位移强度因子。这些结果对于瞬态热环境下压电材料的强度评估很有用。

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