基于模具-制件相互作用的复合材料制件固化变形数值模型

Numerical model on curing deformation of composite part based on tool-part interaction

针对复合材料制件在成型过程中的固化变形这一关键技术问题,通过在模具与复合材料制件之间引入剪切层的方法,建立了预测复合材料制件固化变形的解析计算模型和有限元仿真模型。剪切层的剪切模量用来衡量固化过程中模具与复合材料制件之间的相互作用,其数值大小通过与实验数据进行比对而得到。基于建立的固化变形模型,与文献中已有的实验结果进行了比较。结果表明:所建立的模型具有较高的可靠性。同时针对L型复合材料制件建立了三维有限元仿真模型,模型中除考虑材料各向异性和化学收缩效应以外,还将成型过程中模具与复合材料制件间的相互作用考虑在内。模拟结果表明:引入模具作用后L型零件的固化变形预测结果更加准确。

The deformation of composite parts during curing process is one of the key technique problems.Analytical calculation model and finite element simulation model were proposed to predict the curing deformation of composite parts by introducing a shear layer between the tool and composite part.The shear modulus of the shear layer was used to measure the interaction between the tool and composite part during curing process.The value of shear modulus was obtained by comparing with experimental data.Based on the proposed curing deformation model,the results were compared with experimental results in reference.Results show that the proposed model has good reliability.Meanwhile,a three dimensional finite element simulation model,which took part anisotropy of materials,chemical shrinkage and interaction between the tool and composite part in molding process into account,was also established for L-shaped composite part.Simulation results show that by introducing tool interaction,we could accurately predict curing deformations for L-shaped part.