热障涂层残余应力的相移云纹法测试

MEASUREMENT OF THERMAL RESIDUAL STRESS IN THERMAL BARRIER COATING BY MEANS OF PHASE-SHIFT MOIRE INTERFEROMETRY

本文针对的热障涂层（ＴＢＣ）的细微结构和微小变形特点，提出了一种新的高精度的相移云纹图像处理实验技术，把它同释放法相结合，利用高温云纹光栅，对电子束—物理气相沉积（ＥＢ－ＰＶＤ）热障涂层的残余应力分布进行了测试研究，并与其它方法进行了比较分析。

There are many difficulties in measuring thermal residual stress in thermal barrier coatings,because of their microstructure and microdeformation.Phase-shift moire interferometry is provided which can precisely measure the deformation of solid bodies under various loading conditions.The fundamental theory and experimental technology of the phase-shift moire image-processing technique are introduced.By combining it with relaxation method,a new technique for measuring thermal residual stress is proposed.With the aid of high temperature moire gratings,the distributions of thermal residual stresses in the EB-PVD(electronic beam-physic vapour deposition)coating has been measured,and compared with those other of methods.