| 摘要 |
PURPOSE:To calculate a residual stress-imparting depth in a surface to receive peening treatment from the relation between preliminarily calculated strain quantity and the residual stress imparting depth, by adhering strain gauges to the surface to receive peening treatment of a pipe material and the surface opposite thereto and detecting strain quantity. CONSTITUTION:In performing peening treatment by projecting shots 2 to the outer surface of a pipe material 1 to be treated, a strain gauge 3 is adhered to the surface opposite to the surface to receive peening treatment, that is, the inner surface of the pipe material 1 and the strain quantity generated by peening treatment is detected by a strain gauge 4 while peening treatment is performed. The relation between strain quantity and a residual stress- imparting depth is preliminarily calculated and the residual stress imparting depth is calculated on the basis of the strain quantity detected by the strain gauge 4. By this method, the residual stress-imparting depth can be determined during the peening treatment. Therefore, peening treatment can be rapidly controlled according to necessity. |
