Numerical simulation and experimental investigation of residual stress in the stretching process of the 7075 aluminum alloy

Numerical simulation of the direct thermo-mechanical coupling of temperature field and stress field during the 7075 aluminium alloy plate's quenching process is investigated and the distribution tendency of residual stress is acquired.Numerical simulation of the elimination effect of varying stretching rates on the residual stress in the stretching process is carried out based on isotropic hardening Mises yield criterion and Prandtl-Reuss plastic flow rule with incremental theory.Then blind hole method is adopted to measure the residual stress.Both results show the optimum stretching rate for 12 mm thick 7075 aluminum alloy plate is 1%.From the residual stress distribution rules,it is showed that with varying stretching rates,the elimination effects of surface and internal residual stresses have similar variation tendency.