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为研究弹性预加载范围内7B04T651铝合金带筋构件的蠕变时效变形规律,进行了140℃/20h的蠕变时效成形试验,分析弯曲半径、蒙皮厚度、筋条宽度和筋条高度对回弹率的影响。同时,运用建立的蠕变本构方程和有限元分析模型对蠕变时效成形过程进行仿真分析,计算得到不同条件下的回弹率。结果表明:蒙皮越厚、筋条越高,则回弹率越低;弯曲半径越大、筋条越宽,则回弹率越高。弯曲半径和筋条高度是影响回弹率的主要因素,有限元计算回弹率与试验结果吻合较好,验证了有限元分析模型的准确性。
In order to study the creep aging deformation of 7B04T651 aluminum alloy ribbed members in elastic preloading range, a 140 ℃ / 20h creep aging forming test was carried out. The bending radius, skin thickness, rib width and rib height were analyzed. Impact of bounce rate. At the same time, the creep constitutive equation and the finite element analysis model are established to simulate and analyze the creep-aging forming process, and the rebound rate under different conditions is calculated. The results show that the thicker the skin, the higher the ribs, the lower the rebound rate; the larger the radius of curvature, the wider the ribs, the higher the rebound rate. The bending radius and the rib height are the main factors that affect the rebound rate. The rebound rate calculated by finite element method is in good agreement with the experimental results, which verifies the accuracy of the finite element analysis model.