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Effect of FGM coating thickness on apparent fracture toughness of a thick-walled cylinder

机译:FGM涂层厚度对厚壁圆筒表观断裂韧性的影响

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摘要

This study describes the effect of FGM coating thickness on apparent fracture toughness (AFT) of a thick-walled cylinder containing two diametrically-opposed edge cracks emanating from the inner surface of the cylinder. The incompatible eigenstrain developed in the cylinder due to nonuniform coefficient of thermal expansion because of cooling from sintering temperature is taken into account. Based on a generalized method of evaluating stress intensity factor (SIF) addressed in a previous study, an approach is developed to calculate AFT. Some numerical results of AFT are presented for a TiC/Al_2O_3 FGM coating at the inner surface of an Al_2O_3 thick-walled cylinder.
机译:这项研究描述了FGM涂层厚度对厚壁圆筒的表观断裂韧性(AFT)的影响,该圆筒包含从圆筒的内表面发出的两个直径相对的边缘裂纹。考虑了由于烧结温度冷却导致的热膨胀系数不均匀而在圆柱体中产生的不相容特征应变。基于先前研究中提出的评估应力强度因子(SIF)的通用方法,开发了一种计算AFT的方法。给出了在Al_2O_3厚壁圆柱体内表面的TiC / Al_2O_3 FGM涂层的AFT数值结果。

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