7475铝合金壁板蠕变成形筋条失稳及数值模拟  

Forming stability and numerical simulation of creep forming for 7475 aluminum alloy integrally stiffened panel

作　　者：吴阳[1] 郑英[2] 邓运来[1] 张劲[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]湖南交通职业技术学院机电工程系,湖南长沙410004

出　　处：《锻压技术》2013年第6期56-61,共6页Forging & Stamping Technology

基　　金：国家重点基础研究发展计划(973)项目(2010CB731700)

摘　　要：对于筋条整体壁板的蠕变成形,防止筋条塌陷是该技术成形的关键。采用某单曲率整体加筋壁板进行了热压罐成形试验,应用有限元软件ABAQUS/Standard,模拟了蠕变成形的全过程,通过对比二者的模拟结果验证了有限元模型的正确性。分析了成形过程中筋条的应力应变分布,给出了筋条的临界失稳应力公式,针对成形缺陷提出了夹具成形的优化工艺。实验结果表明,该优化工艺可以使筋条临界失稳压力提高4倍,最大侧向位移由1.4mm减少到0.2mm,使高筋条壁板成形的皱曲缺陷得到明显控制。To prevent collapse of the high ribs for the integrally panel is a key technology for creep forming. Integrally stiffened panel with single curvature was used for the autoclave test, and ABAQUS / Standard was applied to simulate the forming process of creep forming. The right model can be proved by contrasting experimentation and simulation re- sults. The distributions of the stress and strain were analyzed and the critical buckling stress formula was put forward. The optimization of the fixture forming was designed for the buckling defects so that the critical buckling stress was four times larger than it was before, the largest lateral displacement was cut from 1.4 mm to 0.2 mm. As a result, the panel defects can be optimized obviously.

关 键 词：铝合金 整体壁板 蠕变成形 高筋条 

分 类 号：V262[航空宇航科学与技术—航空宇航制造工程]