Effect of FGM coating on apparent fracture toughness of a thick-walled cylinder
This study describes the effect of FGM coating 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 crack surfaces and the inner surface of the cylinder are subjected to an internal pressure.The incompatible eigenstrain developed in the cylinder due to nonuniform coefficient of thermal expansion as a result of cooling from sintering temperature is taken into account.Based on a generalized method of evaluating stress intensity factor (SIF) developed in our previous study,an approach is developed to calculate AFT.To demonstrate the approach,some numerical results of AFT are presented for a TiC/Al2O3 FGM coating at the inner surface of an A12O3 thick-walled cylinder.The effects of material distribution,cylinder wall thickness,application temperature,coating thickness (CT),and number of cracks on the AFT are investigated in details.It is found that all of these factors play important roles in controlling the AFT of the cylinder.
FGM Thick-walled cylinder Apparent fracture toughness Eigenstrain Edge cracks Coating
A.M.Afsar J.I.Song
Department of Mechanical Engineering,Changwon National University,9 Sarim-Dong,Changwon 641-773,Gyeongnam,Korea
国际会议
成都
英文
155-160
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）