重力效应对VARTM工艺中树脂充模过程的影响

Influence of Gravity Effect on Process of Resin Filling in VARTM Process

采用真空辅助树脂传递模塑(VARTM)工艺制备了环氧树脂/亚麻纤维复合材料层合板,记录了树脂在不同树脂流动倾角下的充模时间。通过对层合板进行拉伸、弯曲性能测试,研究了树脂流动倾角对复合材料层合板力学性能的影响。结果表明,在VARTM工艺过程中重力效应对树脂充模时间和层合板力学性能有显著影响;充模时间随着树脂流动倾角的增大(从–90°至90°)而增加;复合材料层合板的拉伸强度、拉伸弹性模量、弯曲强度、弯曲弹性模量等均随树脂流动倾角的增大而增大,树脂流动倾角对弯曲强度的影响最大,且对强度的影响高于模量。由于树脂流动倾角影响了树脂与亚麻纤维的结合情况,导致树脂流动倾角为–90°和90°的复合材料层合板在拉伸与弯曲失效时拥有不同的失效形式。

Vacuum assisted resin transfer molding(VARTM)process was adopted to prepare epoxy resin/linen fiber composite laminates,the filling times of the epoxy resin in different resin flowing tilt angle were recorded.Through testing the tensile and bending properties of the laminates,the effects of resin flowing tilt angle on mechanical properties of the laminates were studied.The results show that the gravity effect of VARTM process has significant influence on the filling time of resin and mechanical properties of the laminates.The filling time increases with the increase of resin flowing tilt angle(changing from–90°to 90°).The tensile strength,tensile modulus of elasticity,bending strength and bending modulus of elasticity of the laminates all increase with the increase of resin flowing tilt angle,the angle has the greatest effects on the bending strength and the effects on the strength is greater than those of modulus.The combination of the resin and linen fibers is affected by resin flowing tilt angle,so the laminates with resin flowing tilt angle of–90°and 90°have different failure forms under the tensile or bending failure process.