聚脲弹性体/纤维增强树脂基复合材料抗冲击性能研究

玻璃纤维增强树脂基复合材料在使用过程中极易受到外力冲击,造成复合材料结构破坏,严重威胁其安全使用寿命。研究了聚脲弹性体涂层对玻璃纤维增强乙烯基树脂复合材料抗冲击性能的影响。通过简支梁摆锤冲击试验和光学显微镜对前涂覆(FCGF)、后涂覆(BCGF)及未涂覆(NCGF)试样进行对比测试。研究结果表明,聚脲弹性体涂层的弹性形变和断裂破坏能够大幅增加冲击能耗,提高整体的冲击强度。当试样聚脲涂层厚度相同时,前涂覆(FCGF)试样聚脲弹性体冲击后并未完全断裂,主要依靠弹性形变吸收冲击能量,起缓冲减震作用;后涂覆(BCGF)试样聚脲弹性体发生断裂破坏能够消耗更多的冲击能量,其整体结构破坏最小,冲击强度更高。

IMPACT RESISTANCE STUDY OF POLYUREA ELASTOMER/GLASS FIBER REINFORCED VINYL RESIN COMPOSITE

Glass fiber reinforced resin composite materials in service is vulnerable to external impacts,which will cause composite structure damage,and thus severly threaten the safety service life of composite.In this paper,the improvement of impact resistance of glass fiber reinforced resin composite materials through coating a layer of polyurea elastomer was investigated.Charpy impact test machine,and optical microscopy were carried out on the specimens of no coating,front coating and back coating,respectively.The results show that the elastic deformation and fracture failure of polyurea coating can dramatically increase impact energy consumption and improve the impact strength of specimens.With the same thickness of coating,the coating of polyurea elastomer of front coating specimens does not completely fracture and absorb impact energy mainly through the elastic deformation,playing a buffer role.Conversely,the back coating specimens can absorb more impact energy due to fracture failure of polyurea coating,which will lead to lowest impact damage and higher impact strength.