Modeling of blast process using indenting method

In this paper, the generating mechanism of residual stress in work surface layers in the indenting process is discussed analytically and experimentally, in order to optimize the processing conditions to produce the desired residual stress in a blast process. Work surfaces were covered with large numbers of uniform dimples at a regular pitch, formed as 20 μm in spherical radius, on annealed 0.5% carbon steel. The results demonstrated that the depth of the plastic region and the strain of polycrystals in the work surface layer using the blast process can be estimated according to those in the indenting process. The residual stress generated in the blast process, which would be dominant to the fatigue strength, can be estimated using the indenting process, although the residual stress distribution in the indenting process differs ±7% from the other process. In addition, the compressive residual stress in the indenting process increases with an increase in the coverage up to almost 200%. This coverage seems to be the ideal target in the blast process.