31 2 基于有限元模拟的时效成形回弹预测
板零件。
Sallah等[26 ]首次提出热压罐时效成形的数学模型。 Narimetla等[27 ]建立了整体壁板时效成形的有限元模型。在加载、卸载阶段 ,采用线弹性薄壳有限元模型 ;时效阶段采用非线性的 Maxwell黏弹性时效应力松弛模型 ,并就时效成形的 3个阶段建立了通用的数学模型。 Ho等[ 25 ,28 ]基于“统一理论”和时效动力学提出统一的时效 2蠕变本构方程 ,并使用 ABAQUS有限元分析软件对铝合金厚板蠕变时效成形进行回弹模拟。因此 ,时效成形有限元模拟的主要流程如图 5所示。
图 5 壁板时效成形有限元模拟流程 Fig15 FEM simulation process of age forming of panels
. 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. http://www.cnki.net
4 结 论
(1)
大型机翼整体壁板时效成形工艺应采用双/多级时效、振动时效等措施 ,并考虑应力位向效应 ,以提高成形的效率 ,降低回弹 ,提高成形后壁板材料的综合性能。
(2)
大型机翼整体壁板时效成形所用到的成形工装 ,应采用模块化、标准化、柔性化的设计和制造方法 ,以提高成形设备的设计制造效率和适用范围 ,降低制造难度。
(3)
回弹是大型机翼整体壁板时效成形中的关键问题 ,需研究壁板时效成形有限元模拟方法 ,并建立准确的蠕变 2应力松弛本构方程 ,以准确预测壁板零件的时效成形回弹。
(4)大型机翼整体壁板制造是大型飞机研制
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