摘要
运用ANSYS有限元分析软件模拟了双层热障涂层(ZrO2/NiCrAlY)在制备过程中的温度场,在此基础上,进行热-应力耦合计算分析试样的残余应力,重点计算了不同基体表面粗糙度条件下的残余应力分布。结果表明:试样的温度分布呈不均匀变化,与实际喷涂过程相近;双层热障涂层的最大残余应力集中在粗糙界面的凸起与凹坑部分;涂层内的等效残余应力随表面粗糙度的增大整体呈增大趋势,在Ra=30μm附近时,等效残余应力较小,同时压应力较小。
Using fmite element analysis software ANSYS, the temperature field of double-layer thermal barrier coatings （TBCs） was numerical simulated in the course of fabricating specimen, The residual stress in the coatings was numerically analyzed by the method of thermal-stress coupling analysis, and residual stress distribution under the different matrix surface roughness was calcualted.The result shows that the temperature distributions in the specimens change unevenly, which agrees with the real spraying course.The maximum residual stress concentrates on the tip and pit of the coarse interfaces.The equivalent stresses of TBCs have increasing trend with the increase of interface roughness, The smaller the equivalent stress is, the lower the compress stress appears at the roughness value of Rα=30μm,
出处
《热加工工艺》
CSCD
北大核心
2007年第7期82-85,共4页
Hot Working Technology
关键词
热障涂层
ANSYS
残余应力
界面粗糙度
thermal barrier coatings （TBCs）
ANSYS
residual stress
interface roughness
