热固性碳纤维预浸料单/双隔膜预成型对比及数值模拟

Comparison and numerical simulation of single/double diaphragm forming of thermosetting carbon fiber prepreg

热隔膜成型工艺是一种快速成型预成型体的方法。为了对比单/双隔膜预成型工艺预成型体质量的差异,利用热隔膜成型装置成型具有双曲特征的C形预成型体,通过观察试验件褶皱产生的大小和位置评估成型温度、铺层顺序、铺层数、预成型体尺寸和成型工艺对预浸料成型质量的影响,同时建立了热隔膜成型仿真模型,并对仿真结果与试验结果进行对比。研究表明:铺层顺序对褶皱的产生有很大的影响,减少[45°/0°]铺层组合可以有效地减少褶皱产生,0°铺层在受压时容易诱导褶皱产生;预成型体越厚越容易产生成型缺陷;对于C形预成型体,采用双隔膜成型比单隔膜成型具有更好的成型质量,尤其对缘条位置褶皱的产生具有显著的抑制作用;基于ABAQUS建立的热隔膜成型仿真模型能较为准确地预测褶皱。

Hot diaphragm forming process is a method for rapid forming of preforms combining the advantages of automatic laying technology.In order to compare the difference of the preform formed by single and double dia-phragm forming process,a hot diaphragm forming process device was used to form the C-type preform.The influ-ence of temperature,layup sequence,number of layers,size of preforms and forming type on the quality of prepregs was evaluated by observing the size and position of the wrinkle.Moreover,the simulation model of hot diaphragm forming is established and compared with the experimental results.The results show that reducing the overlay combi-nation of[45°/0°]can effectively reduce the wrinkle generation.0°ply is easy to induce the generation of wrinkle when pressed.The thicker the preform is,the more likely it is to cause defects.For the C-shaped preform,the double diaphragm forming has better forming quality than the single diaphragm forming,especially in inhibiting the generation of wrinkle at the cap.Moreover,the thermal diaphragm forming simulation model based on ABAQUS can predict the wrinkle accurately.