热固性树脂基复合材料层合板成型过程形成的残余应力是影响材料质量的重要因素.针对复合材料固化过程建立了基于复合材料物性参数时变特性的复合材料固化过程的三维多场耦合计算模型.该模型包含经典的热-化学模型、树脂固化动力学模型、残余应力模型;在此基础上将材料物性参数时变特性引入多场耦合计算模型中,模型计算结果通过与文献中实验结果比较,验证所建立的固化模型的可靠性;在此基础上,对AS4/3501-6复合材料层合板的固化残余应变应力进行数值模拟,研究了固化过程中残余应变/应力的变化规律,分析工艺参数对应力应变的影响.通过与光纤光栅应变试验比较,验证其正确性.研究结果表明:模型可以很好地仿真复合材料固化过程;温度、树脂体积分数、铺层角度对层合板应力/应变都有较为显著的影响,为正相关关系,其中树脂的体积分数影响最为显著.
Residual stress formed during the curing process of thermoset resin composites is an important factor affecting the quality of material.A three-dimensional model based on the time-dependent physical parameters of materials during the curing process of composites was established.It contains thermal-chemical,resin curing kinetic model,and the residual stress model.On the basis,the time-dependent properties of material performances during the curing process were introduced into multi-field coupled calculation model.According to the comparison with experiment data in reference,the reliability of the model was verified.Then,the curing residual stress and strain of composite laminates were numerically simulated,the change rule of the curing residual stress and strain of composite laminates was studied,and the effect of process parameters on the stress and strain was analyzed.Through the comparison with the strain of pre-preg test,the correctness was verified.And the results show that the model can simulate composite curing process.Temperature,volume fraction of resin,and ply angle have significant impact on laminates stress and strain,and the affect of volume fraction of the resin is the most significant among these factors.
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