BT20钛合金筒形件真空热胀形过程热力耦合有限元分析

Coupled thermo-mechanical FEM analysis of the vacuum hot bulge forming of BT20 Titanium alloy cylindrical workpiece

建立了BT20钛合金筒形件真空热胀形的二维非线性准静态热弹塑性有限元模型。该模型考虑了辐射传热和材料热物性非线性等因素的影响。使用有限元软件MSC．Marc对BT20钛合金筒形件真空热胀形过程进行数值模拟,计算了BT20钛合金筒形件真空热胀形过程的温度场、变形场和应力场,并进行了相应的实验验证。数值模拟结果与实验结果吻合较好,说明了所建立的热力耦合模型的有效性。

A 2-D nonlinear quasi-static thermo-mechanical coupled finite element model was developed. Effects of non-linear factors, such as thermal radiation and temperature-dependent thermal and mechanical properties of materials etc. were considered in the model. Numerical simulation of the vacuum hot bulge forming of BT20 Titanium alloy was carried out using the finite element software MSC. Marc. The temperature field, deformation field and stress field of vacuum hot bulge forming of BT20 Titanium alloy were calculated using the model. The corresponding experiment was carried out. The simulated results were in the good agreement with the experimental results, which showed the validity of the present thermo-mechanical coupled model.