缠绕复合材料结构固化残余应力的数值计算

Numerical Simulation of Residual Stress in Filament Wound Composite Structure During Curing Process

利用傅里叶热传导方程、基体的固化动力学方程以及复合材料在固化过程中的力学性能本构模型,建立缠绕复合材料结构的固化工艺以及残余应力应变分析模型,分析计算研究复合材料固化过程中产生的残余应力。计算结果显示:缠绕复合材料最外层的残余应力均为正应力,最内层的残余应力均为负应力;缠绕复合材料的内径、层数、纤维体积分数、基体化学收缩比以及固化工艺温度对残余应力的影响较大。

The curing process and residual stress model for filament wound composite structure were established by using the Fourier heat conduction equation,the curing kinetics equation of the matrix and the mechanical constitutive model of the composite material during the curing process to study the residual stress produced during the curing process. The calculate results show that the residual stress of the outermost layer of the wound composite material is positive stress,and the residual stress in the innermost layer is negative stress. The influence of the inner diameter,number of layers,volume fraction of the fiber,shrinkage ratio of the matrix and the curing temperature on residual stress are larger.