Study on Instability and Fracture of Aluminum Alloy Stiffener Panels Under Multi-Point Press Bending
LIU Chunguo1, YUE Tao1, CUI Qi2
1. College of Material Science and Engineering, Roll Forging Research Institute of Jilin University, Changchun 130025, China;
2. CRRC Changchun Railway Vehicles Co., LTD., Changchun 130062, China
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.
刘纯国1,岳韬1,崔琪2. 铝合金壁板筋条多点对压成形失稳及断裂研究[J]. 航空制造技术, 2018, 61(18): 16-22.
LIU Chunguo1, YUE Tao1, CUI Qi2. Study on Instability and Fracture of Aluminum Alloy Stiffener Panels Under Multi-Point Press Bending. Aeronautical Manufacturing Technology, 2018, 61(18): 16-22.