空气热循环对T700/双马来酰亚胺复合材料低速冲击性能的影响

对碳纤维(T700)/双马来酰亚胺(HT280)复合材料进行了空气热循环实验(-60~180℃),分别测试了经历空气热循环前后材料的低速冲击性能和质损率,利用超声C扫描对冲击后材料内部损伤状况进行了分析。实验结果表明:随空气热循环次数的增加,质损率先迅速升高然后趋于平缓。随低速冲击能量的增大,空气热循环前后试样的平均损伤区域面积呈增加趋势,其破坏模式会发生明显变化。在相同低速冲击能量下,经历空气热循环试样的平均损伤区域面积和吸收能均大于原始态试样的。

Effects of air thermal cycling on low-velocity impact property of T700/bismaleimide composites

Carbon fiber(T700)/bismaleimide (HT280) composites were performed by air thermal cycles experiments from -60 ℃ to 180 ℃. The low-velocity impact property and mass loss rate of materials were tested before and after air thermal cycles, respectively. Internal damage condition of materials after impact was analyzed using ultrasonic C-scanning. The experimental results show that the mass loss rate rises rapidly and then levels off with increasing air thermal cycles. The average damage area size of sample before and after air thermal cycles increases and the fracture mode varies with the increase of low-velocity impact energy. The average damage area size and absorbed energy of sample after air thermal cycles are bigger than the ones of sample in original state when subjected to the same low-velocity impact energy.