开孔对热塑性复合材料层合板抗反复冲击性能影响的研究

STUDY ON THE EFFECT OF OPENING HOLE ON THE RECIPROCATING IMPACT RESISTANCE OF THERMOPLASTIC COMPOSITE LAMINATES

研究了孔与冲击点的距离对玻璃纤维增强聚丙烯复合材料层合板抗反复冲击性能的影响。采用热压成型工艺制备了连续玻璃纤维增强聚丙烯层合板,通过落锤冲击试验机对层合板进行反复冲击,直至其发生完全穿透,获得冲击响应的相关数据。结果表明:孔与冲击点的距离d对玻纤增强聚丙烯层合板抗反复冲击性能的影响显著,就一次冲击而言,距离d越大,最大接触力越大,位移和吸收能量反而越小。相比于无孔层合板,d为5 mm、10 mm、15 mm、20 mm的开孔板抗反复冲击的次数分别降低了88. 1%、57. 6%、20. 3%、3. 3%。反复冲击过程中,d=5 mm和d=10 mm开孔板的最大接触力存在峰值点,开孔促进了层合板吸收冲击能量,每次冲击的吸收能量随着冲击次数的增加而缓慢增加。

In this paper,the effect of the distance between the hole and the impact point on the repeated impact resistance of the glass fiber reinforced polypropylene composite(GFRPP)laminate is studied.GFRPP laminates were prepared by hot press forming.Repeated impact on laminates were performed by drop hammer impact tester.Until it is completely penetrated,the relevant data of the impact response is obtained.The results show that the distance d between the hole and the impact point has a significant effect on the repeated impact resistance of the GFRPP laminate.For a single impact,the larger the distance is,the larger the maximum contact force of the impact response,and the smaller the displacement and the absorption energy.Compared with non-hole laminates,the number of times of d=5 mm,10 mm,15 mm,20 mm perforated plates against repeated impacts decreased by 88.1%,57.6%,20.3%,and 3.3%,respectively.During the repeated impact process,the maximum contact force of the d=5 mm and d=10 mm aperture plates has a peak point,which promotes the absorption energy of the laminate,and the absorption energy of each impact increases slowly with the increase of the number of impacts.