Method for computing stress relaxation numerical values and resilience of titanium alloy

The invention provides a method for computing stress relaxation numerical values and resilience of titanium alloy. The method includes steps of (1), performing thermal stress relaxation tests on titanium alloy materials on material testing machines; (2), drawing stress relaxation curves of the titanium alloy and analyzing features of the curves; (3), selecting proper creep constitutive functions according to a principle that stress relaxation is essentially creep, and determining material parameters of the titanium alloy by a trial and error process; (4), substituting the parameters determined in the step (3) into creep analysis modules on the basis of finite element software ABAQUS and analyzing creep relaxation of workpieces by a static implicit algorithm; (5), determining resilience unloading initial states according to creep relaxation data, analyzing resilience of the workpieces and determining the magnitude of resilience of the workpieces after the workpieces resile from creep. The method has the advantages that as shown by analysis results, the resilience of components is greatly reduced after the titanium alloy is relaxed from stress, and the forming precision can be improved; proper relaxation time is selected, so that the titanium alloy components can be precisely formed.