英文(有参考文献).doc

Measurement of heat treatment induced residual stresses by using ESPI combined with hole-drilling method
Abstract: ln this study, residual stresses in heat treated specimen were measured by using ESPI(Electronic Speckle-Pattern Interferometry) combined with the hole-drilling method．The specimen，made of SUS 304 austenitic stainless steel, was quenched and water cooled to room temperature．Numerical simulation using a hybrid FDM／FEM package was also carried out to simulate the heat treatment process．As a result，the thermal stress fields were obtained from both the experiment and the numerical simulation．By comparison of stress fields, results from the experimental method and numerical simulation well agreed to each other, therefore，it is proved that the presented experimental method is applicable and reliable for heat treatment Induced residual stress measurement．
Key words: thermal stress; heat treatment; residual stress; electron speckle-pattern interferometry; hole-drilling method; hybrid FDM/FEM
Residual stresses which appear during different stages of the manufacturing process of structural elements may exert a considerably negative influence on both the structure’s static strength and fatigue lifetime [1]. On the other hand．For some types of structural units, taking into account residual stress may reveal new beneficial operating capabilities．Therefore, it is necessary and important to determine the
residual stresses in real structures．
To determine the residual stresses，many stress measurement methods have been developed．Some of those methods are destructive and some nondestructive．The destructive methods rely on the monitoring of changes in component distortion, either during the generation of the residual stresses or afterward, by deliberately removing material to allow the stresses to relax，while nondestructive methods such as XRD(X—Ray Diffraction)mostly use diffraction．In general, nondestructive methods can give the higher accuracy than destructi