Study on Time-dependent Annealing Residual Stress Model of Zr-4 Sheets

In order to guide the eliminating residual stress of Zr-4 sheets by annealing, the cold rolled zr-4 sheets were raw materials, Zr-4 sheets with different residual stresses were prepared by annealing experiment, and the residual stresses before and after annealing were measured by X-ray apparatus. Combined with the traditional power exponential model, the time-dependent residual stress decay model of Zr-4 plate annealing process was innovatively established. The model was inserted into ABAQUS finite element software, the residual stress decay curve of Zr-4 plate was obtained. The results show that the residual stress value of each point is within 20% different from the test value.