Mixed-mode interfacial fracture toughness for thermal barrier coating
Mixed-mode interfacial fracture toughness for thermal barrier coating
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DOI：
10.1016/j.engfracmech.2006.10.021
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发表时间：
2007-09
影响因子：
5.4
通讯作者：
M. Arai;Y. Okajima;K. Kishimoto
中科院分区：
文献类型：
--
作者：
M. Arai;Y. Okajima;K. Kishimoto
提出了一种新的界面断裂测试方法，用于测量热障涂层材料在较宽加载相角范围内的混合型界面断裂韧性。这种方法的原理是，由于压缩载荷，涂层从基材剥离到涂层边缘，形成对界面的剪切载荷，以及诸如梁弯曲的悬挂载荷，作为对界面的法向载荷。给出了该测试方法的能量释放率和相关复应力强度因子的完全封闭形式。利用自行研制的热喷涂试验装置，对镍基高温合金热喷涂氧化钇稳定氧化锆涂层进行了试验研究。结果表明，涂层-界面裂纹的能量释放率随着加载相角的增加而增加，加载相角由应力强度因子K2与K1之比的tan−1定义。结果表明，界面能释放率随第II类载荷的增加主要与裂纹表面粗糙度摩擦产生的接触屏蔽效应有关。
A new interfacial fracture test method was developed for measuring the mixed-mode interfacial fracture toughness of thermal barrier coated material over a wide range of loading phase angles. The principle of this developed method is based on peeling the coating from the substrate due to compressive loading to the coating edge, as forming a shear loading to the interface, and slinging loading such as beam bending, as normal loading to the interface. The complete closed form of the energy release rate and associated complex stress intensity factor for our testing method is shown. An yttria stabilized zirconia (YSZ) coating, which was sprayed thermally on Ni-based superalloy, was tested using the testing device developed here. The results showed that the energy release rate for the coating-interfacial crack increased with loading phase angle, which is defined by tan−1for a ratio of stress intensity factor K2to K1. It was noticed that the interfacial energy release rate increasing with mode II loading could be mainly associated with the contact shielding effect due to crack surface roughness rubbing together.