Strengthening effect of laser shock: concave model with and without reflection

Abstract

When a laser shock wave is loaded onto the surface of a concave model, many factors affect the laser shock effect, including loading pressure, curvature, surface wave and reflection of longitudinal wave. It is difficult to clarify the mixed effects of these factors, as such. The reflection of longitudinal wave is the most important factor, and the non-reflective concave model can effectively distinguish the influence of longitudinal wave reflection. In this paper, the concave models with and without reflection are established using the ABAQUS software. The effect of loading pressure, curvature, surface wave, and reflection of longitudinal wave on laser shock processing are analyzed. Curvature changes the incident angle of the laser during processing, so the actual pressure on the material surface changes. The results show that the optimal loading pressure is 2000 MPa/4 J when the curvature is 1/5 and the spot radius is 4 mm. The experimental results are consistent with the simulation results, so the simulation results are reliable.

An investigation on the effect of stacking fault energies on surface mechanical treatment process of AA6061 alloy and ETP-copper

“…Severe Surface Mechanical Treatment (SSMT) is one such mechanical treatment technique similar to shot peening which employs mechanical peening to produce a very hard surface on the metal. It involves the creation of a zone of residual compression (ZRC) on the metal surface leading to work hardening [16][17][18][19][20][21]. The complete overlapping of ZRC due to repeated peening will result in severe plastic deformation, which will eventually lead to grain fragmentation and accumulation of dislocations.…”