成型工艺对复合材料加筋蒙皮结构固化变形的影响

Effect of moulding process on curing deformation of the composite stiffened panel structure

考虑不同成型工艺的影响,研究了加筋蒙皮复合材料结构的固化变形。通过真空袋压工艺,分别采用共固化、共胶结和二次胶结固化制备了碳纤维/环氧复合材料加筋蒙皮结构并测量其固化变形。针对不同的成型工艺,采用瞬时线弹性固化本构模型,将固化残余应力作为预应力,提出一种考虑不同成型方式的有限元仿真方法,并与实验结果进行对比。分析了成型工艺、铺层方式和加筋厚度对加筋蒙皮结构固化变形的影响。结果表明:成型工艺、铺层和加筋厚度等对结构的固化变形有较大影响,通过合理的铺层,增加加筋厚度及选择合适的成型工艺,可以较大降低加筋蒙皮结构的变形量。

Considering the effect of different moulding processes,this paper studies the curing deformation of laminated composites of stiffened panel structures.The curing deformation is assessed after the stiffened panel structures of carbon fiber/epoxy resin composites are created through vacuum bag pressing process by co-curing,co-bonding,and secondary bonding and curing.For different moulding processes,by using an instantaneous linear elastic curing constitutive model and taking residual curing stresses as pre-stress,a finite element simulation method considering different curing methods is proposed,and is also compared and verified with the experimental results.The influences of factors such as moulding processes,layup methods and stiffener thickness on the curing deformation of the stiffened panel structures are analyzed.The results show that moulding processes,layup and stiffener thickness have a great influence on the curing deformation of the structures.The deformation of composite stiffened panel structures decreases considerably by increasing stiffener thickness and adopting an appropriate moulding process through a reasonable layup.