文献类型：期刊文献

英文题名：Creep fracture parameters of functionally graded coating

作者：Chen, Jian-Jun[1]; Tu, Shan-Tung[1]

机构：[1]E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China

年份：2004

卷号：27

期号：6

起止页码：805

外文期刊名：JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS

收录：;EI(收录号：2004468455422);WOS:【SCI-EXPANDED(收录号:WOS:000224708700008)】；

语种：英文

外文关键词：functionally graded material; creep crack; C*; strain energy density rate factor

摘要：Functionally graded coating (FGC) has been widely used in severe conditions for its excellent mechanical characteristics compared with pure coating material. The graded component in the FGC can be described by specified local volume fraction rules of coating material. In this paper an inhomogeneous finite element method is used to investigate the crack behavior in FGC at elevated temperature with the power-law constitutive equation. The path-independent integral value C* characterizes amplitude of the crack tip stress fields at steady stage. Different volume fractions of coating material, creep coefficients and creep indices are analyzed by systematic computation to obtain the effects of these factors on crack growth and obtain the knowledge to minimize crack damage in the FGC. In addition, strain energy density rate factor, Lambda, is proposed as a material parameter for measuring crack resistance capability in creep conditions. The preliminary analysis with Lambda is also applied in FGC and the numerical results showed that Lambda can also characterize the loading capacity of the coating system.