热处理对EP/CF及EP/CF/GF复合材料力学性能的影响

采用真空辅助树脂转移模塑(VARTM)技术制备了环氧树脂/碳纤维(EP/CF)和环氧树脂/碳纤维/玻璃纤维毡(EP/CF/GF)复合材料.测试了两种纤维铺层方式中树脂流动距离的平方与流动时间的关系,对两种铺层纤维体系的渗透率进行了研究对比;将两种复合材料进行高温处理,并且对其高温处理前后的力学性能进行分析;利用扫描电子...

Effect of Heat Treatment on Mechanical Properties of EP/CF and EP/CF/GF

The development of high?performance fiber?reinforced composite materials to replace traditional metal materials is considered as one of the most effective ways to realize the lightweight of automobiles. However， the application safety of automobile has risen an emerging for the high?temperature resistance of composite materials. This work focuses on the influence of high temperature treatment on the mechanical properties of composite materials. Epoxy resin （EP）/carbon fiber （CF） and EP/CF/glass mat （GF） composites were prepared through vacuum assisted resin transfer molding （VARTM）.The relationship between the square of resin flow distance and the flow time in the two fiber layup modes was explored， and the permeability of the two fiber layup systems was investigated comparatively. Two types of composites were treated at high temperatures and their mechanical properties before and after the high temperature treatment were analyzed. The tensile fracture morphology of the composites was observed by scanning electron microscopy. The results indicated that the loose structure of GF felt in the EP/CF/GF composites made the resin flow more easily. The Young's modulus and tensile strain of EP/CF composites decreased by 9.97 % and 11.36 %， respectively. However， the effect of heat treatment on the EP/CF/GF composites was insignificant. The addition of GF felt resulted in a decrease in the flexure properties of the two composites. The fracture surface of the composites without heat treatment was smooth. However， after heat treatment， the fracture surface became rough with significant deformation of the matrix.