椭球曲面薄壁构件蠕变时效成形仿真与试验

Simulation and experiment on creep aging for thin wall component with ellipsoid surface

基于2219铝合金宏微观统一蠕变时效本构模型,应用大型商业有限元分析软件MSC.MARC对其进行二次开发,实现以运载火箭燃料贮箱瓜瓣为代表的椭球曲面薄壁构件的蠕变时效成形过程模拟仿真,分析了仿真过程中构件内部应力、应变、屈服强度分布以及变化规律,并开展了贮箱瓜瓣的蠕变时效成形试验。对比仿真与试验结果可知,构件各位置仿真与试验成形偏差在1.95 mm以内,构件力学性能最优位置位于底边中点区域,典型位置处屈服强度分布规律与仿真结果一致,其测试值与仿真值偏差在6.62%以内,构件各个位置沿轧制不同角度的屈服强度值呈现出0°〈45°〈90°的趋势。仿真模拟与试验结果存在较好的一致性,验证了蠕变时效本构模型和有限元仿真模型的正确性。

Based on the macro-microscopic unified creep aging constitutive model of aluminum alloy 2219,the secondary development was conducted by the large-scale commercial finite element analysis software MSC. MARC,and the creep aging process of thin wall component with ellipsoid surface for carrier rocket fuel tank melon flap was simulated. Then,the distribution and variation law of stress,strain,yield strength of components were analyzed during the simulation process,and the creep aging tests of tank melop flap were carried out. The comparison between simulation results and test results shows that the deviation of each position for components is within 1. 95 mm,and the optimal position of mechanical properties is in the midpoint of bottom edge. Furthermore,the distribution of tested yield strength at the typical position is consistent with the simulation results with a deviation of 6. 62%,and the yield strength values at different rolling angles of each component exhibit a tendency of 0° 45° 90°. Thus,the simulation results are in good agreement with the test results,and the correctness of creep aging constitutive model and finite element simulation model are verified.