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This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling method.The selection of the location of the testing area is analyzed from theory and experiment.In the theoretical study,the factors which affect the surface released radial strainεr were analyzed on the basis of the formulae of the hole-drilling method,and the relations between those factors andεr were established.By combining Moiréinterferometry with the hole-drilling method,the residual stress of interference-fit specimen was measured to verify the theoretical analysis.According to the analysis results,the testing area for minimizing the error of strain measurement is determined.Moreover,if the orientation of the maximum principal stress is known,the value of strain will be measured with higher precision by the Moiréinterferometry method.
This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling method. The selection of the location of the testing area is analyzed from theory and experiment. The theoretical study, the factors which affect the surface released radial strainεr were analyzed on the basis of the formulae of the hole-drilling method, and the relations among those factors andεr were established. By combining Moiréinterferometry with the hole-drilling method, the residual stress of interference-fit specimen was measured to verify the theoretical analysis. According to the analysis results, according to the analysis results, according to the analysis of the results of the analysis of the maximum principal stress is known, the value of strain will be measured with higher precision by the Moiréinterferometry method.