嵌入加强筋的缝合泡沫夹芯结构复合材料VARTM工艺树脂充填模拟及验证

在缝合泡沫夹芯结构复合材料的泡沫中嵌入轻质的加强筋板,可以在不增加缝合密度并且在只增加较少质量的前提下,增强复合材料制品整体的强度和刚性。文中对真空辅助树脂传递模塑成型(VARTM)工艺树脂在嵌入加强筋的缝合泡沫夹芯结构复合材料预成型体中充填过程进行模拟和验证研究。采用一种矩形流道模型代替沿加强筋与泡沫空隙间的树脂流动,并对其等效渗透率及孔隙率进行计算;通过PAM-RTM软件模拟了嵌入加强筋板的缝合泡沫夹芯结构VARTM工艺的树脂充填过程,并建立了流动可视化实验装置与模拟对比,结果表明模拟与实验相当吻合。而模拟与实验的结果均表明加强筋的引入可以在局部加强树脂沿厚度方向的流动,但是会延缓树脂对整个预成型体的充填。

Simulation and Verification of Resin Flow of Ribs Embedded in Stitched Foam Core Sandwich Structure by VARTM Process

Lightweight reinforced ribs were embedded in the foam of stitched foam core sandwich structure,which can enhance the strength and rigidity by no increasing stitch density and a little bit mass added.The simulation and verification of resin flow in the preform of ribs embedded in stitched foam core sandwich structure with vacuum assisted resin transfer molding (VARTM) process were carried out.A rectangular channel model was proposed to replace the resin flow along the gap between the ribs and the foam,and its equivalence permeability and porosity were calculated.Then the resin flow in embedded-ribs stitched foam core sandwich preform was simulated during VARTM process by PAM-RTM and a visual flow experimental device was established to verify the simulation results.The results of simulation and experiment are quite consistent.The results show that the introduction of the ribs can strengthen the flow of the resin along the thickness direction,but it will dday the resin filling to the whole preform.