复合材料带曲率C型梁热隔膜预成型试验与仿真分析

Experiment and Simulation Analysis of Hot Diaphragm Forming about Composite C-Beam with Curvature

随着复合材料自动铺带和铺丝技术的成熟,并且广泛应用于复合材料结构的生产与制造。通过与铺带或铺丝技术相结合使得复合材料热隔膜预成型技术成为制作L型、C型,Z型等细长零件的重要手段,此种方式可以减少大量的人工操作,并且能够用于实现自动化工业生产。复合材料热隔膜预成型是一个使预浸料叠层变形的复杂过程,本文对带曲率C型梁的预成型过程进行仿真分析,首先通过试验得到预浸料铺层间摩擦系数,然后对湿态预浸料的力学性能进行测试。利用测试得到参数,采用有限元方法对C型梁预成型过程中铺层间的滑移进行模拟得到了铺层变形后的褶皱缺陷。通过专用的热隔膜成型设备对C型梁预成型进行试验研究,将试验结果与仿真结果进行对比分析,验证了预成型仿真手段的可行性,为后续热隔膜预成型过程中的参数优化提供指导。

With the maturity of composite material automatic tape laying(ATL)and automatic fiber placement(AFP),it is widely used in the production and manufacture of composite structure.Combining with ATL or AFP method,hot diaphragm forming(HDF)has become an important means of making L,C,Z and other slender structures.This method can reduce lots of manual operations and can be used for automatic industrial production.The HDF is a complex deformation process.In this paper,the simulation of the forming process of the C-beam with curvature is carried out.Firstly,the friction coefficient between the plies is obtained through the test,and then the mechanical properties of the wet prepreg are tested.The interlayer slipping during the forming process is simulated to obtain the wrinkle defects after the deformation of the composite plies.Experimental research on C-beam preforming is carried out with special thermal diaphragm forming equipment,and the experiment results were compared with simulation results to verify the feasibility of the preforming simulation method and provide guidance for parameter optimization in the subsequent HDF process.