Delamination Strength of WC-Co Thermal-Sprayed Coating Under Combined Stresses by Torsion-Tension Pin-Test Method
Delamination Strength of WC-Co Thermal-Sprayed Coating Under Combined Stresses by Torsion-Tension Pin-Test Method
复制标题
扭拉销试验法测定复合应力下WC-Co热喷涂层的剥离强度
DOI：
10.1007/s11666-014-0108-z
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发表时间：
2014
影响因子：
3.1
通讯作者：
K. Higaki
中科院分区：
文献类型：
--
作者：
K. Kaneko;K. Higaki
本文采用一种新开发的扭拉销试验方法，对WC-Co热喷涂层在扭转和拉伸联合作用下的分层强度进行了评价。首先，通过实验研究了销钉直径和涂层厚度对表观分层强度的影响。其次，利用有限元分析程序MARC对销钉与涂层界面附近的应力分布进行了数值计算。确定了扭转销的断裂面与涂层与销的界面重合。实验测得的表观分层强度随销钉直径的增加而线性下降，随涂层厚度t的增加而增加，但在t=400Tμm或更高时稳定。剪切剥离强度随拉伸应力的增加而降低。当较厚的涂层发生分层时，在界面处也观察到类似的应力分布，与销钉直径无关。对于WC-12Co热喷涂层，得到了剪切应力场(Ks)和拉应力场(Ka)强度的临界组合，即涂层在剪切和拉伸联合载荷作用下的分层准则。这些组合被发现与销子直径和涂层厚度无关。
In this report, the delamination strength of WC-Co thermal-sprayed coatings under combined torsion and tension is evaluated using a newly developed method, which is called the torsion-tension pin-test. First, the effects of both the pin diameter and the coating thickness on the apparent delamination strength were investigated experimentally. Second, the stress distributions around the interface edge between the pin and the coating were numerically obtained by using the finite element analysis program “MARC.” It was confirmed that the fractured plane of the torsion pin coincides with the interfacial plane between the coating and the pin. The apparent delamination strength obtained experimentally decreased linearly with increasing pin diameter and increased with increasing coating thickness t, but it was stable at t of 400 μm or more. The shear delamination strength decreased with increasing tensile stress. Similar stress distributions were observed at the interface when delaminations occurred for rather thick coatings, independent of the pin diameter. The critical combination of the strength of shear stress fields (Ks) with that of tensile stress fields (Ka), i.e., the delamination criteria of the coating under combined shear and tensile loadings, was obtained for a WC-12Co thermal-sprayed coating. These combinations were found to be independent of pin diameter and coating thickness.
影响因子：
5.4
作者：
M. Arai;Y. Okajima;K. Kishimoto
通讯作者：
M. Arai;Y. Okajima;K. Kishimoto