Predictive Self-closed Modeling of Laser Shock Peening and Parametric Study

Author:  Cao, Shin
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 359-364)
Doc ID:  2011060
Year of Publication:  2011
Abstract:  
Abstract Laser shock peening process is characterized by high amplitude shock wave propagation in the targets and deep compressive residual stresses. In this presentation, a predictive self-closed model of LSP is presented, which consists of a plasma model to predict the pressure distribution resulting from laser-material interaction and a dynamic model to predict the resultant residual stresses. Parametric study results based on this predictive model are presented along with experimental results for several metals with black paint, vinyl tape, and aluminum tape coatings. For an aluminum tape coating, a thin glue layer that is used to connect the foil onto the substrate surface has usually been neglected in all previous FEM simulations. To gain a better understanding of the effect of the glue layer on the resultant residual stresses, a glue layer is added into the FEM between the coating material and substrate. The model prediction of residual stresses with a glue layer is compared with the experimental data and simulation results without a glue layer, which clearly shows that the simulation results with a glue layer yield better agreement with the measurement data. Keywords Laser shock peening, self-closed model, residual stress, interface modeling