初始残余应力对铝合金7475板件变形的解析法研究

针对航空铝合金7475典型件在加工中易引起弯曲变形,导致加工精度超差,成品率低下等问题,利用解析法和工程力学理论研究其初始残余应力在单面剥层和正反面剥层两种情况下每剥一层后残余应力的重新分布规律和对应的工件变形情况,利用实验进行验证此解析方法计算结果是正确的.通过解析值可知,单面剥层时,在剥层超过板厚一半多时工件向相反方向翘曲变形,而正反面剥层时始终沿一个方向弯曲,而且工件变形值比单面剥层时的变形值小.这种解析方法可以通过残余应力的变化规律及工件变形情况来有效地控制工件变形,同时适用于其他材料相关分析,是一个通用性强的方法.

Analytical method research of the initial residual stress on the deformation of aluminum alloy 7475 plates

The process of typical components for aerospace aluminum alloy 7475 easily leads to bending deformation,precision tolerance,low yield and other issues.Analytical method and the use of engineering mechanics theory aircraft aluminum alloy 7475 plates of the initial residual stress in single layer and peeling layer is negative in both cases strip ing layer after each re-distribution of residual stress and the corresponding deformation of the workpiece,validated using experimental results of this analytical method is correct.Value through the analysis shows that one-sided stripping layer,the peel layer thickness of more than half of the workpiece in the opposite direction.When the positive and negative direction is always along a bend,and the workpiece deformation when comparedwithsingle-sided delamination small deformation.This analytical method can be the variation of residual stress and deformation of the work piece to effectively control the deformation of the work piece,while correlation analysis applied to other materials,is a versatile approach.