Optimization on springback reduction in cold stretch forming of titanium-alloy aircraft skin

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 12; pp. 2350 - 2357
• Main Author: 何德华 李东升 李小强 金朝海
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2010; School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
• Subjects: Aircraft; aircraft skin; Finite element method; Indicators; Mathematical models; Optimization; Process parameters; Springback; Stretch forming; titanium alloy; 优化模型; 冷拉伸; 参数优化设计; 回弹分析; 成型工艺参数; 显式有限元法; 钛合金; 飞机蒙皮; titanium alloy; stretch forming; aircraft skin; springback; optimization
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60654-1

An optimization method was presented for cold stretch forming of titanium-alloy aircraft skin to determine process parameters and to reduce springback.In the optimization model,a mathematical formulation of stress difference was developed as an indicator of the degree of springback instead of implicit springback analysis.Explicit finite element method（FEM）was used to analyze the forming process and to provide the stress distribution for calculating the amount of the stress indicator.In addition,multi-island genetic algorithm（MGA）was employed to seek the optimal loading condition.A case study was performed to demonstrate the potential of the suggested method.The results show that the optimization design of process parameters effectively reduces the amount of springback and improves the part shape accuracy.It provides a guideline for controlling springback in stretch forming of aircraft skin.