Influence of Interface Roughness on the Fatigue Life of Thermal Barrier Coatings
Thermal barrier coatings (TBC) are coating system comprising a heat insulating ceramic coating deposited on top of a oxidation resistant metallic coating.During thermal cycling,cracks grow in the metal/ceramic interface which causes the coating system to fail.In order to model such crack growth by finite element (FE) modelling,accurate interface models must be developed.The presented research studies the influence of interface roughness on the thermal fatigue life of TBCs,and suggests how interface models can be derived from interface roughness parameters.High interface roughness was found to promote longer fatigue lives.Interface models were derived from the roughness parameters Rc,Ra,RSm and Rdq and used for FE modelling of crack growth in the interface.The calculated stress intensities,KI and KII,increased with increasing interface roughness and thereby did not predict a slower crack growth with higher interface roughness as was observed experimentally.
Thermal barrier coating Interface Roughness Fatigue
Robert Eriksson S(o)ren Sj(o)str(o)m H(a)kan Brodin Sten Johansson Lars (O)stergren Xin-Hai Li
Department of Management and Engineering,Link(o)ping University,Link(o)ping SE-58183,Sweden Department of Management and Engineering,Link(o)ping University,Link(o)ping SE-58183,Sweden;Siemens GKN Aerospace Engine Systems,Trollh(a)ttan SE-46181,Sweden Siemens Industrial Turbomachinery AB,Finspong SE- 61283,Sweden
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）