于庆民,石永志.热不匹配应力对热障涂层表面裂纹扩展的影响[J].稀有金属材料与工程,2018,47(10):3052~3057.[Yu Qingmin,Shi Yongzhi.Effect of Thermal Mismatch Stress on Surface Crack Propagation of Thermal Barrier Coatings[J].Rare Metal Materials and Engineering,2018,47(10):3052~3057.]
热不匹配应力对热障涂层表面裂纹扩展的影响
投稿时间:2016-12-07  修订日期:2018-08-11
中文关键词:  热障涂层  热失配应力  表面裂纹  扩展有限元
基金项目:中央高校基本科研业务费专项资金资助(项目号3102015ZY031)
中文摘要:
      本文采用扩展有限元方(XFEM)法研究了高温下热失配应力对热障涂层表面裂纹扩展的影响。结果表明在热失配应力的影响下,表面裂纹的位置、倾斜角度和长度对裂纹扩展的长度、能量释放率和裂尖的应力水平有着显著的影响;对于初始长度相同的裂纹,界面波谷处裂纹扩展长度最长,能量释放率最大;倾斜角度越大,裂纹扩张长度越短,应变能越大;裂纹初始长度越大,裂纹的扩展长度越长且扩展速率越快,能量释放率越大。存在多条表面裂纹的情况下其裂纹扩展相互影响。
Effect of Thermal Mismatch Stress on Surface Crack Propagation of Thermal Barrier Coatings
英文关键词:thermal barrier coating  thermal mismatch stress  surface crack  extended finite element method
英文摘要:
      In this study, the effect of thermal mismatch stress on the surface crack propagation of thermal barrier coatings was investigated by using extended finite element method (XFEM). The results show that the location, slope angle and length of crack have a significant impact on crack propagation length, energy release rate and stress level at crack tip under the influence of thermal mismatch stress. The crack length is the longest and the energy release rate is the largest in the valley for the same initial crack. The larger the slope angle is, the shorter the length of crack expansion is but the larger the strain energy is. The larger the initial crack length is, the longer the crack growth length and the faster the expansion rate is, and the greater the energy release rate is. The crack propagation affects each other under the condition of multiple cracks.
作者单位E-mail
于庆民 西北工业大学 qingminyu@163.com 
石永志 西北工业大学  
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