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等离子喷涂热障涂层残余应力的实验与模拟研究
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杨加胜1,2,3, 于建华4, 钟兴华1,2, 赵华玉1,2, 周霞明1,2, 陶顺衍1,2 , 丁传贤1,2 |
Experimental and Numerical Investigation of Residual Stresses in Plasma-sprayed Thermal Barrier Coatings
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YANG Jia-Sheng 1,2,3, YU Jian-Hua 4, ZHONG Xing-Hua 1,2, ZHAO Hua-Yu 1,2, ZHOU Xia-Ming 1,2, TAO Shun-Yan 1,2, DING Chuan-Xian 1,2 |
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Fig. 5 Shear stress at the bondcoattopcoat interface as a function of radial direction The tensile axial stress may cause spallation of the coating. Interfacial cracks initiated at the free edge can propagate radially toward the central region, causing a progressive delamination. Close to the free edge, the maximum tensile shear stress of 46 MPa occurrs at the bondcoattopcoat interface Fig. 5. This large stress can be attributed to either shear or mixed modes of failure of coatings [ 8 ] .
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