聚酰亚胺纤维/双马树脂复合材料抗高速冲击性能

采用热压罐成型工艺制备聚酰亚胺纤维/双马树脂复合材料,并采用空气炮冲击实验研究聚酰亚胺纤维体积分数和环境温度对复合材料层板抗高速冲击性能的影响。结果表明:与等面重下TC4钛合金相比,S35聚酰亚胺纤维复合材料抗高速冲击性能更优,且具有优异的高温抗高冲击性能。聚酰亚胺纤维体积分数越高,复合材料层板抗高冲击性能越高,其中,73%体积分数的聚酰亚胺纤维复合材料层板室温弹道吸能可达227.0J,比等面重下TC4钛合金高240%。冲击速率较低时,复合材料弹击面出现周围含纤维分层开裂的圆形凹坑,背弹面出现沿纤维方向的分层开裂;冲击速率较高时,复合材料层板弹击面出现周围含纤维分层开裂的圆形通孔,背弹面出现沿纤维方向大面积纤维分层开裂。

Anti-high speed impact properties of polyimide fiber/bismaleimide resin composites

The polyimide fiber/bismaleimide resin composites were prepared by the autoclave molding process.Effects of volume fraction of polyimide fiber and ambient temperature on the high speed impact properties were investigated using the air cannon impact test.The results demonstrate that the anti-high speed impact property of S35 polyimide fiber reinforced composites is superior to that of TC4 titanium alloy under equal area mass.And polyimide fiber composites have excellent high temperature anti-high speed impact property.Meanwhile,the results also indicate that the volume fraction of polyimide fiber can improve the anti-high speed impact property of the composites.Also,the ballistic.energy absorption of polyimide fiber reinforced composites with 73%volume fraction at room temperature can reach 227.0 J,which is 240% higher than that of TC4 titanium alloy under equal area mass.Furthermore,when the impact velocity is low,the composites appear a circular pit with fiber delamination around on the impact surface,while the back surface appears delamination along the fiber direction.Also,when the impact velocity is high,a circular hole with fiber delamination around is formed on the impact surface of composites,and large area fiber delamination along the fiber direction is observed on the back surface.