Study of the Residual Stress in 2A97 Al-Li Alloy Using Different Methods

摘要

The contour method and X-ray diffraction have been used to measure the quenching stress in 2A97 Al-Li alloy. The surface stresses were measured by X-ray diffraction. Besides, the 2-D distribution of stresses have been given by the contour method. The differences between the two methods can be more than 100 MPa. In addition, finite element model which is suitable for evaluation of residual stresses in this material was established. There is very good correlation between the contour method and finite element model (FEM). The differences are less than 50MPa. The model has high precision to forecast the residual stress in 2A97 Al-Li alloy.