考虑孔隙的复合材料热压罐固化数值模拟研究

Numerical Simulation of Composite Autoclave Curing Considering Porosity

考虑孔隙的影响,建立了预测复合材料构件残余应力的数值模拟计算理论模型,在理论模型中引入孔隙变量来描述材料特性的变化.基于粘弹性固化残余应力本构,采用顺序耦合和完全耦合两种热力耦合数值模拟方法来预测复合材料构件变形和残余应力的演变趋势.通过与实验对比,验证所建模型的正确性及有效性,重点研究耦合方式之间的差异性和孔隙的影响趋势.结果表明:顺序耦合较完全耦合模拟方法计算效率更高,粘弹性模型对复合材料构件的固化残余应力预测准确,孔隙含量对固化变形有明显的降低趋势.

Considering the effect of pores,a numerical simulation model for predicting residual stress of composite components is established.Pore variables are introduced into the model to describe the change of material properties.Based on viscoelastic curing residual stress constitutive,sequential coupling and full coupling thermal coupling numerical simulation methods were used to predict the evolution trend of deformation and residual stress of composite members.The correctness and effectiveness of the model are verified by comparison with experiments,and the differences between coupling modes and the influence trend of pores are studied.The results show that the sequential coupling method is more efficient than the full coupling method.The viscoelastic model can predict the residual stress of the composite members accurately,and the pore content has an obvious tendency to decrease the curing deformation.