NUMERICAL SIMULATION OF ONE PULSE POWER LASER SHOCKPEENING

摘要

Laser shock peening (LSP) is a novel technology of surface treatment. LSP utilizes a short laser pulse withhigh energy density, which induced a high pressure stress wave propagation and residual compressive stress on materialsurface. The effects of LSP of SAE9310 steel with a laser pulse of 14.2J at 2.9mm square beam have been studied byfinite element method. The underlying formulation is based on Lagangian elastoplastic materials model. The propagationof shock wave, residual stress and plastic strain are simulated. The simulations show that the residual stress is mainly inthe radial direction of the workpiece, and nearly zero in the longitudinal direction. The plastic strain remains on theprocessed surface dominantly. Divergences between theoretical and experimental residual stress occur due to thesimplification of shock peening conditions.