Study of Residual Stress in the Vicinity of Interface Corner of Sprayed Coatings.

T. Terasaki, T. Akiyama, T. Hirai, K. Seo
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Abstract

This paper deals with the singularity of residual stress arising at the interface corner of sprayed substrates and the effects of specimen size, mechanical and physical properties on residual stress distributions using the theory of elasticity and a boundary element method (BEM).The residual stress distribution is not only defined by one singular term, then it is difficult to use a stress intensity factor as the parameter to define the strength of sprayed substrate.The residual stress distribution of test specimen satisfying following conditions are the same as that of sprayed substrate in a working field : The test specimen is composed of the substrate with the thickness being 4 times, and the length and the width being 8 times as large as a thickness of sprayed coating.The preheat temperature TB of substrate in order to make a residual stress zero is given by the temperature of sprayed coating and the ratio of linear thermal expansions of coating and substrate materials.
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喷涂涂层界面角附近残余应力的研究。
本文运用弹性理论和边界元法,研究了喷射基板界面角残余应力的奇异性,以及试样尺寸、力学和物理性能对残余应力分布的影响。残余应力分布不能用单一项来定义,难以用应力强度因子作为参数来定义喷涂基体的强度。满足以下条件的试件在工作现场的残余应力分布与喷涂基体相同:试件由厚度为喷涂涂层厚度4倍、长度和宽度为喷涂涂层厚度8倍的基体组成。使残余应力为零的基体预热温度TB由喷涂涂层温度和涂层与基体材料的线性热膨胀比给出。
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