铝合金壁板筋条多点对压成形失稳及断裂研究  

Study on Instability and Fracture of Aluminum Alloy Stiffener Panels Under Multi-Point Press Bending

作　　者：刘纯国[1] 岳韬 崔琪 LIU Chunguo;YUE Tao;CUI Qi(College of Material Science and Engineering,Roll Forging Research Institute of Jilin University,Changchun 130025,China;CRRC Changchun Railway Vehicles Co.,LTD.,Changchun 130062,China)

机构地区：[1]吉林大学材料科学与工程学院,辊锻工艺研究所,长春130025 [2]中车长春轨道客车股份有限公司,长春130062

出　　处：《航空制造技术》2018年第18期16-22,共7页Aeronautical Manufacturing Technology

基　　金：国家自然基金项目(51575231)

摘　　要：应用多点模具对压成形铝合金整体壁板是一种新技术,如何预测和避免筋条的失稳和断裂是该技术能否用于实际生产的关键问题之一。针对铝合金壁板筋条的多点弯曲过程,提出了失稳和断裂的判定方法,应用有限元模拟和多点压弯试验进行了对比分析。结果表明,失稳和断裂判定方法能够预测筋条产生失稳和断裂的位置和时刻。基于多点模具形状调整快的特点,采用分道次成形的方式研究了压弯半径对筋条断裂和失稳的影响规律,确定了单筋条多点压弯时的极限曲率半径。模拟了复杂结构整体壁板在变路径加载条件下的失稳和断裂情况,优化了加载路径。The application of multi-point dies in the aluminum alloy integral panel forming is a novel forming method. However, how to predict and avoid the instability and fracture of the stiffeners has become a difficult problem in practical application. In this paper, the criterions for instability and fracture of the stiffeners in multi-point forming process were proposed. And the finite element simulation and multi-point bending test were carried out to make a comparison. The results show that the criterions proposed can predict the positions and moments when the instability or fracture occurs. Moreover, the changing of fracture and instability with different bending radius in step-by-step multi-point forming was investigated, and the forming limits of the stiffeners were also found out. The instability and fracture of integral panels with varying path forming were simulated, and the optimal loading path is selected.

关 键 词：多点对压成形 铝合金 整体壁板 失稳 断裂 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程] TG146.21[一般工业技术—材料科学与工程]