纤维增强聚丙烯复合材料的力学性能研究

Research on Mechanical Properties of Fiber Reinforced PP Resin

采用模压工艺制备了连续纤维增强聚丙烯复合材料与短纤维增强聚丙烯复合材料的层合材料,测试了含不同连续纤维层比例的层合材料力学性能,分析了其失效机理。结果表明,连续纤维层可以显著提高层合材料的强度,层合材料的强度随连续纤维层的增加而提高。连续纤维层与短纤维层的界面在拉伸测试中保持完好,可以有效传递应力,20%连续纤维层的层合材料拉伸失效以撕裂为主。层合材料在弯曲过程中尽管部分连续纤维断裂,但连续纤维层有效抑制了材料截面的穿透性裂纹扩展,阻止了材料的宏观断裂。连续纤维层与短纤维层的强度差异导致层合材料在冲击过程中扭转,层间界面在扭转剪切作用下分层失效。

The laminate materials were prepared from continuous fiber reinforced PP resin and short fiber reinforced PP resin by using molding process,the mechanical properties of prepared laminate materials with different continuous fiber layer ratio were studied,and the failure mechanisms were analyzed.The results showed that the continuous fiber could enhance the strength of laminate materials significantly,and the strength of laminate materials increased with the increase of the continuous fiber content.The surface of continuous fiber layer and short fiber layer maintained well,which could effectively transfer stress,the tearing was main failure of the laminate material with 20%continuous fiber under tensile load.Though the laminate materials in bending occurred partial continuous fiber fracture,continuous fiber layer effectively restrain extension of through wall flaw of material section,and prevented macro fracture of materials.The difference of strength between continuous fiber layer with short fiber layer leaded to reverse of the laminate materials in the process of impact,and interlayer interface occurred layered failure under the influence of torsion shear.