锻压技术

7B04铝合金带筋构件的蠕变时效变形行为研究

英文标题：Research on deformation behavior of creep age forming for 7B04 aluminum alloy stiffened components

作者：吕凤工黄遐曾元松

分类号：TG306

出版年,卷(期):页码：2015,40(3):99-103

摘要：

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 ℃/20 h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。

For the study on the deformation regularity of creep age forming of 7B04T651 aluminium component with stiffeners under elastic preloading, the experiments of creep age forming were operated at 140 ℃/20 h. And the influences of the curvature radius, skin thickness, stiffener width and stiffener height on the component springback rate were analyzed. At the same time, the constitutive equation and finite element model were established, and the forming process was simulated. After that, the springback rates under different conditions were computed. The results show that the springback rate decreases when the skin thickness and the stiffener height increase. The springback rate increases when the curvature radius and the stiffener width increase. The main factors which impact the springback rate are the curvature radius and the stiffener height. The springback rates of experiments are in accordance with that of numerical results, and the correctness of the finite element model is verified.

基金项目：

国家自然科学基金资助项目(50975267)

吕凤工（1988-），男，硕士，助理工程师

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