PMI泡沫对碳纤维复合材料抗低速冲击性能的影响

EFFECT OF PMI FOAM ON LOW-VELOCITY IMPACT RESISTANCE OF CARBON FIBER COMPOSITES

采用落锤冲击试验开展了PMI泡沫对碳纤维复合材料抗低速冲击性能的影响研究。对厚度为5mm的碳纤维复合材料层合板、PMI泡沫(厚为3mm)夹芯碳纤维复合材料(上下蒙皮各为2.5mm)试件分别用5J、10J、20J、40J能量进行低速落锤冲击实验。实验结果表明,泡沫夹芯碳纤维复合材料的吸能效果好于碳纤维复合材料层合板。随着冲击能量的提高,两者的冲击吸能效果差距越来越小,但夹芯板的冲击损伤情况好于层合板,同时碳纤维复合材料层合板的吸收/冲击能量比的值逐渐增大,而泡沫夹芯碳纤维复合材料的逐渐减小,但在40J及其以下的冲击能量下,夹芯板的吸收/冲击能量比都高于层合板。

In this paper,the effect of PMI foam on the low-velocity impact resistance of carbon fiber composites was studied by drop weight impact test. Experiments were carried out on carbon fiber composite laminates with a thickness of 5 mm and PMI foam(3 mm thick) sandwich carbon fiber composites(2. 5 mm each for upper and lower skins) with low-velocity impact energy of 5 J,10 J,20 J,40 J,respectively. The experimental results show that the energy absorption effect of foam sandwich carbon fiber composites is better than that of carbon fiber composite laminates. Along with the increase of impact energy,the impact energy absorption effect between the foam sandwich composite material and the carbon fiber composite laminate is getting smaller and smaller,but the impact damage of the sandwich panel is better than that of the laminate. As the impact energy increases,the ratio of the absorbed impact energy of the carbon fiber composite laminate increases gradually and the foam sandwich carbon fiber composite decreases gradually. However,under the impact energy of 40 J and below,the absorption energy ratio of the carbon fiber composite laminate is lower than that of the foam sandwich carbon fiber composite.