基于有限元方法的钛合金整体结构件毛坯初始残余应力场构建

In this paper an annealing process analysis for titanium alloy monolithic component blank is performed based on finite element method by applying the thermo-mechanical and elastic-plastic theories, which is employed to construct initial residual stress field. In order to verify the accuracy of finite element simulation, the stress experiment is carried out by combining stripping layer method with X-ray diffraction technology. The simulated residual stress is compared with experimental data and found to be in good agreement, validating, therefore, the proposed finite element model and constructed residual stress field. The research results show that the margin of titanium alloy blank cools fast and next is the surface layer, while the center region cools slow; There is large thermal stress difference between surface layer and center region along thickness direction, while the small difference along the length and width direction; The stress radiates from the center region to outside, the center region being the maximum value, then decreases gradually, until a minimum value is attained at the corner.