Reliability assessment on interfacial failure of thermal barrier coatings

• DOI: 10.1007/s10409-016-0595-x
• Publication Date: 2016-08-23T12:54:49Z
• Authors: Jin-Wei Guo; Li Yang; Yi-Chun Zhou; Li-Min He; Wang Zhu; Can-Ying Cai; Chun-Sheng Lu
• Keywords: 0203 mechanical engineering; 600; 02 engineering and technology; 620

Thermal barrier coatings (TBCs) usually exhibit an uncertain lifetime owing to their scattering mechanical properties and severe service conditions. To consider these uncertainties, a reliability assessment method is proposed based on failure probability analysis. First, a limit state equation is established to demarcate the boundary between failure and safe regions, and then the failure probability is calculated by the integration of a probability density function in the failure area according to the first- or second-order moment. It is shown that the parameters related to interfacial failure follow a Weibull distribution in two types of TBC. The interfacial failure of TBCs is significantly affected by the thermal mismatch of material properties and the temperature drop in service.