Fracture analysis of Thermal Barrier Coating Delamination under Thermal Shock
Thermal barrier coatings are widely used in section of turbine engines.The effect of a transient thermal load on a coating which is bonded to a square substrate is analyzed using FEM method.Coatings are assumed to contain embedded cracks and they are thermally loaded according to a transient low temperature environment.Thermal barrier coating mixed I/II mode fracture criterion was established,Our models take into account various locations of cracks,crack delamination instances including different crack positions between ceramic coating and bond coating were analyzed.Its found that under thermal shock the crack tip fields are shear-dominant.The total energy release rate and the stress intensity factor of mode II of interfacial crack is greater than that of ceramic coating,indicating that once the unilateral interfacial crack appears,the unstable propagation of interfacial crack is more likely to occur subsequently.
Thermal barrier coating Finite element method Delamination cracks Thermal Shock
Chen Ping-wei Wang Shao-ming Wang Feng-Hui
AVIC Shenyang engine design and research institute,Shenyang 110015,China Northwestern Polytechnical University,Xian 710129,China AVIC Shenyang engine design and research institute,Shenyang 110015,China;Northwestern Polytechnical
国际会议
2014 Asia-Pacific International Symposium on Aerospace Technology(2014亚太航空航天技术学术会议)
上海
英文
1-5
2014-09-24（万方平台首次上网日期，不代表论文的发表时间）