Example of the Computer Simulation of Shot Peening Process

Author:  Nakonieczny, Borkowski, Wymyslowski
Source:  Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Doc ID:  2002068
Year of Publication:  2002
Abstract:  
Authors Aleksander Nakonieczny 1), Pawel Borkowski 2), Pawel Wymyslowski 2) 1) Institute of Precision Mechanics, Technical University of Warsaw, Warsaw, Poland 2) Institute of Air Technical and Applied Mechanics, Technical University of Warsaw, Warsaw, Poland 1 Materials for simulation 40 HM steel was taken as the considered material. For the need of simulation of shot impacts at the same position, a cylindrical form of specimen was assumed. In other cases cuboidal specimens were considered. Cast iron shot of the diameter of 0.4 mm thrown with the velocity of 80 m/s was considered for calculations. Material data of specimens and shot assumed for simulation are shown in Table 1. Table 1: Material data of specimens and shot used for simulation of shot peening process _________________________________________________________________________ Material data Shot Specimen material ST170 40HM _________________________________________________________________________ Young's modulus E [MPa] 2.15 10 5 2.06 10 5 Tensile strength Rm [MPa] 750 1079.0 Yield point Re [MPa] 380 882 Coefficient k 0.09 0.07 Modulus of strain hardening Eu [MPa] 19.35 10 3 14.42 10 3 Poisson's ratio v 0.295 0.29 Density p [kg/m3] 7800 7800 Friction coefficient u 0.1 0.1 _________________________________________________________________________ It was assumed that after the onset of plastic deformation, materials show a decrease of longitudinal modulus of rigidity defined by the coefficient k, and when stresses attain the value of immediate tensile strength Rm material shows an ideal plastic flow.