三维机织复合材料曲板固化变形研究

Cure-induced deformation of 3D woven composite curved plate

建立了考虑非均匀温度场影响的复合材料曲板残余应力和固化变形的有限元预测模型,模拟了三维机织复合材料曲板的RTM成型过程,分析了成型过程中曲板温度、固化度及内应力的分布与变化。结果表明,在成型过程中曲板会形成非均匀的温度场和内应力场。温度场的均匀性对曲板变形有较大的影响,若不考虑非均匀温度场的影响会使误差增大10%~15%。使用RTM工艺制备了三维机织复合材料曲板并采用热电偶对成型过程中曲板内部的温度进行监测,利用工业光学扫描仪对曲板的固化变形进行测量。预测结果与实验结果吻合较好,验证了所建立数值模型的准确性,同时还分析了固化温度和厚度对固化变形的影响。

A finite element prediction model for the residual stress and cure-induced deformation of composite curved plate considering the influence of non-uniform temperature field was established,the RTM forming process of 3D woven composite curved plate was simulated and the distribution and change of temperature,degree of cure and internal stress of the curved plate was analyzed.The results show that the curved plate forms a non-uniform temperature and internal stress field during the curing process.The uniformity of the temperature field has a significant influence on the deformation of the curved plate.If the influence of non-uniform temperature field is not considered,the error will be increased by 10%-15%.The 3D woven composite curved plate was manufactured by RTM process,and the temperature of the curved plate during the process was monitored by thermocouple,and the cure-induced deformation of the curved plate was measured by an industrial optical scanner.The predicted results are in good agreement with the experimental results,which verifies the accuracy of the established numerical model.The effects of curing temperature and thickness on curing deformation were also analyzed.