Crack propagation induced by thermal shocks in structured media
Crack propagation induced by thermal shocks in structured media
复制标题
DOI：
10.1016/j.ijsolstr.2013.05.001
复制
发表时间：
2013-08-15
影响因子：
3.6
通讯作者：
Movchan, A. B.
中科院分区：
文献类型：
--
作者：
Carta, G.;Jones, I. S.;Movchan, A. B.
本文描述了结构热弹性固体中边缘裂纹的扩展。在结构化固体的边界处施加由时间周期性的一系列高梯度温度脉冲表示的温度的快速变化。在这里讨论的模型分析中采用了晶格近似。为了描述裂纹前进通过晶格的破坏准则，由此链节一旦达到临界弹性伸长就断裂。链节的伸长是由温度变化和由于热冲击在边界处产生的弹性波以及由通过弹性韧带的断裂而传播的裂纹产生的波产生的。分析相比，准静态和动态模型的热剥离在热加载固体边缘裂纹。重点讨论了结构对裂纹俘获的影响。本文提出的非线性模拟表明，裂纹扩展的平均速度可以估计从裂纹引发的波的频散特性的分析。温度和惯性对裂纹扩展的贡献也进行了研究。研究发现，惯性放大了连杆的伸长，从而影响裂纹通过结构化固体的前进。(C)2013爱思唯尔有限公司保留所有权利。
This paper describes the propagation of an edge crack in a structured thermoelastic solid. A rapid change of temperature, represented by a time-periodic series of high-gradient temperature pulses, is applied at the boundary of the structured solid. A lattice approximation is employed in the model analysis discussed here. In order to describe the crack advance through the lattice a failure criterion is imposed, whereby the links break as soon as they attain a critical elastic elongation. The elongations of the links are produced both by a variation in temperature and by elastic waves generated at the boundary due to thermal shocks, as well as waves created by the propagating crack through the breakage of the elastic ligaments. The analysis is compared to the quasi-static and dynamic models of thermal striping in thermally loaded solids containing edge cracks. The emphasis is on the effect of the structure on the crack trapping. The non-linear simulations presented in this paper show that the average speed of crack propagation can be estimated from the analysis of the dispersion properties of waves initiated by the crack. Temperature and inertia contributions to crack propagation are also investigated. It is found that inertia amplifies the elongations of the links, and thus influences the crack advance through the structured solid. (C) 2013 Elsevier Ltd. All rights reserved.