筋板类LY12铝合金零件蠕变时效成形有限元分析

FE analysis on creep age forming of Al alloy LY12 ribbed-plate parts

蠕变时效成形技术对于航空航天器件中大型复杂整体壁板类零件的制造具有独特优势,被认为是大型飞机特别重要的金属成形工艺之一。文章利用自行设计的工装,经试验确定了LY12铝合金的最佳蠕变时效成形温度;通过蠕变拉伸试验,得出LY12铝合金材料在最佳温度下的蠕变本构方程中的材料常数,并应用有限元软件ABAQUS分析了筋板类LY12铝合金零件的弯曲蠕变过程及回弹效应。

Creep age forming have unique advantage in manufacture of large and complex integral ribbed-plate parts for aerospace component and is considered to be one of the most important metallic forming process for large airplane. The best creep age forming temperature for A1 alloy LY12 was determined through experiment by using self-designed technical equipment. Then the material parameters of A1 alloy LY12 in the creep constitutive is obtained by creep tensile test under optimum forming temperature. Furthermore, the creep process and springback effect of ribbed-plate A1 alloy LY12 parts are analyzed by using FE software ABAQUS.