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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Investigation on the effective parameters of through-the-width crack propagation in ceramic coatings due to substrate tension using discrete element method
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Investigation on the effective parameters of through-the-width crack propagation in ceramic coatings due to substrate tension using discrete element method

机译：离散拉伸法研究基体张力引起的陶瓷涂层贯穿裂纹扩展的有效参数

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摘要

This paper aims to simulate surface cracking and interfacial delamination in ceramic coatings due to their application in different industries. For this purpose, one of the most widely used ceramics, yttrium-stabilized zirconia, which is used as a thermal insulator for superalloy substrate is considered as a case study. Discrete element method was used, due to its great ability to capture the damages at the microscale, to investigate the effect of crack spacing and coating thickness on crack initiation and propagation. Discrete element method solver code is provided by the authors. To investigate damages, a unit cell of the structure between two successive surface cracks was considered. The length of the unit cell represents the crack density in the structure. In addition, for each unit cell length, three coating thicknesses were considered. The results of the current study were compared and validated with those experiments and numerical simulation results presented in the open literature. Good agreement was found. Finally, the effect of interface roughness on stress distribution and damage initiation was examined.
机译：本文旨在模拟由于陶瓷涂层在不同行业中的应用而引起的表面开裂和界面分层。为此，作为案例研究，考虑使用一种最广泛使用的陶瓷，即钇稳定的氧化锆，该氧化锆用作高温合金基体的绝热材料。由于离散元方法具有捕获微观尺度损伤的强大能力，因此使用离散元方法来研究裂纹间距和涂层厚度对裂纹萌生和扩展的影响。作者提供了离散元素方法求解器代码。为了研究损伤，考虑了两个连续的表面裂纹之间的结构的晶胞。晶胞的长度代表结构中的裂纹密度。另外，对于每个晶胞长度，考虑了三种涂层厚度。本研究的结果与公开文献中提供的那些实验和数值模拟结果进行了比较和验证。找到了良好的协议。最后，研究了界面粗糙度对应力分布和损伤萌生的影响。

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