Measurement of residual stress distribution on the surface of a material by means of imaging plate and computerized tomography

摘要

In this paper, a method for determining the distribution of residual stress on the surface was studied. The method used in this study was a combination of the method based on the cosα method with an imaging plate (IP-cosα method), and the computerized tomography (CT). In the present method, mean stresses over many different irradiated linear area are measured using the IP- cosα method first. Second, the distribution of stress on the surface of the material is reconstructed through the CT approach. The present method has a feature that the measurement is easier because the usual analytic method of X-ray stress measurement for polycrystalline materials can be used. In principle, the method is applicable to coarse-grained materials, and thus it will be useful to obtained actual residual stress state on coarse-grained materials.