Application of computerized tomography to residual stress obtained by X-ray diffraction method using imaging plate

A new X-ray approach was proposed for determining the distribution of stress on the surface of a material using an imaging plate (IP). In this method, the computerized tomography (CT) was applied to stresses averaged over a linearly irradiated area obtained using a diffraction ring detected using an IP. Projections of residual stresses were reconstructed using the CT approach and the distribution of stress σx(x,y) was obtained. As long as the mean stresses were measured from the linearly irradiated area, the distribution of stress can be determined using the ordinary X-ray technique for polycrystalline aggregates by the present method without the ordinary X-ray approach for a single crystal using a four-circle goniometry. (author)