Research in Engineering and Aviation

Simulation of Surface Roughness Effects on Residual Stress in Laser Shock Peening

June 2013

Author(s): Hasser, P.,, Malik, A.S., Langer, K., Spradlin, T.

Proceedings of the ASME 2013 Manufacturing Science and Engineering Conference (MSEC2013-1232), June 10-14, 2013, Madison, WI.


Laser peening (LP) has shown to be a viable method by which the fatigue life of metallic components can be extended. Although current commercial implementation of LP techniques has not developed much beyond a trial-and-error methodology to implement the process, researchers at several institutions have examined various parameters that affect residual stress fields induced by LP, using Finite Element Analysis (FEA) and semi-empirical eigenstrain methods. This research is a preliminary investigation of a potentially under-considered variable in laser peening—material surface roughness. The influence of surface roughness on laser peening has not previously been studied through finite element modeling. The main point of interest for this work is to discover the amount that surface roughness magnitude affects the residual stresses created by LP.