通过对比铝合金平面直线翻边试验及基于集中性失稳模型得到的极限应变和开裂断口,研究了汽车用铝合金滚压包边的失效机理;基于韧性断裂、塑性增量法则和混合强化准则,理论推导得到了弯曲成形极限图,并通过试验对成形极限应力图进行了验证;最后,通过数值解析的方法,研究了韧性断裂准则在滚边成形中的适用范围.结果表明:基于韧性断裂准则的成形极限图,可以用来预测铝合金滚压包边过程中产生的开裂;包边变形过程中弯曲强化效应无法忽略,适用于拉弯成形极限预测的集中性失稳理论将无法应用于滚压包边成形.
参考文献
| [1] | S. Thuillier;N. Le Maout;P. Y. Manach;D. Debois .Numerical simulation of the roll hemming process[J].Journal of Materials Processing Technology,2008(1-3):226-233. |
| [2] | N. Le Maout;S. Thuillier;P.Y. Manach .Aluminum alloy damage evolution for different strain paths - Application to hemming process[J].Engineering Fracture Mechanics,2009(9):1202-1214. |
| [3] | A. R. Ragab .Prediction of fracture limit curves in sheet metals using a void growth and coalescence model[J].Journal of Materials Processing Technology,2008(1-3):206-213. |
| [4] | Jieshi Chen;Xianbin Zhou;Jun Chen .Sheet metal forming limit prediction based on plastic deformation energy[J].Journal of Materials Processing Technology,2010(2):315-322. |
| [5] | Chien WY;Pan J;Tang SC .A combined necking and shear localization analysis for aluminum sheets under biaxial stretching conditions[J].International Journal of Plasticity,2004(11):1953-1981. |
| [6] | Guosong Lin;Jing Li;S. Jack Hu;Wayne Cai .A Computational Response Surface Study of Three-Dimensional Aluminum Hemming Using Solid-to-Shell Mapping[J].Journal of manufacturing science and engineering,2007(2):360-368. |
| [7] | 王海波,万敏,吴向东,韩非.不同强化模型下的板料成形极限[J].机械工程学报,2007(08):60-65. |
| [8] | Xing Hu;Z.Q. Lin;S.H. Li;Y.X. Zhao .Fracture limit prediction for roller hemming of aluminum alloy sheet[J].Materials & design,2010(3):1410-1416. |
| [9] | 胡星,赵亦希,李淑慧,林忠钦.铝合金板在循环塑性变形下的韧性断裂行为模拟[J].中国有色金属学报（英文版）,2011(07):1595-1601. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%