Numerical simulation of temperature and stress field of metal plates irradiated by pulsed laser

In order to study the thermal and stress field of metal plates irradiated moving pulsed laser beam,3-D simulation models for thermal and stress field were built by means of finite element analysis method based on the thermal elasto-plastic constitutive theory.The distribution and evolvement of temperature and stress with the space and time was obtained.The numerical results show that the surface of the metal is melt within the laser pulse existing time,solidified in the interval of the discontinuous pulses.The temperature variation curves are serrate with different peaks.The stress field varies tempestuously with the tensile stress and compressive stresses transformed reciprocally.After the remelting and cooling down,residual tensile stress retains in the remelting zone with the longitudinal tensile stress reaches 799MPa and the transverse stress reaches 700MPa.