| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of measuring residual stress which can measure residual stress of a surface of an object to be measured with high precision, and measure residual stress of an object to be measured semi-nondestructively. SOLUTION: Shapes of reference impressions 3, 4 by an impressing element with a constant cross-section for the same material as that of an object to be measured are experimentally and analytically determined beforehand in the absence of residual stress, while a degree of deformation of the shape of an impression by the effect of the stress corresponding to the material is determined about direction and size. Facing actual measurement, an impression is formed on the surface of the object to be measured having residual stress using the same impressing element as the impressing element under the same condition, and the shape of an actual impression is compared with the shapes of the reference impressions 3, 4. On the basis of differences about direction and size between the both shapes, the residual stress of the object to be measured is determined using the value of the stress determined from the deformation of the reference impressions 3, 4.
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