采用顺序耦合的方法建立了交叉筋壁板激光弯曲成形的有限元模型, 对壁板成形过程中的温度场和应变场进行分析, 提出一种变功率扫描策略来减小壁板的非期望变形。结果显示, 恒参数扫描时交叉筋壁板不仅发生横向弯曲, 还发生纵向弯曲, 并且扫描线上的蒙皮发生下凹。分析表明, 蒙皮的下凹是由横向弯曲变形不一致导致的, 纵向弯曲是由纵向塑性压应变导致的; 采用提出的变功率扫描策略可以有效减小壁板的非期望变形, 将蒙皮的最大下陷量和自由端的相对弯曲程度分别减小了80%和58%。

A finite element model of laser bending of cross-stiffened integral panel (CSIP) is established by use of sequential coupling method. The deformation process of CSIP is investigated by analyses of the temperature field and the strain field. Then a varying power scanning strategy is proposed to reduce the undesirable deformation. The results show that not only transverse bending but also longitudinal bending occur when the CSIP is scanned with constant parameters. And the skin near scanning line is sunken to somewhat extent. The analyses suggest that the nonuniform transverse bending and the existence of longitudinal plastic strain lead to the concave of skin and longitudinal bending, respectively. The varying power strategy could reduce the undesirable deformation effectively, which reduces the maximum sinkage of skin and relative bending of free end by 80% and 58%, respectively.