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对增加了表面防护层的国产碳纤维/增韧环氧树脂CCF300/5228A层板的低速冲击及冲击后压缩性能进行了试验研究。通过落锤式低速冲击试验,得到了各组层板的冲击接触力历程、凹坑深度和内部分层面积等特征,而冲击后压缩试验结果可用来对各组层板的损伤容限性能进行评估。结果表明,同裸板相比,加了表面防护层的层板其分层起始载荷变化不大,但形成同样的1.0mm凹坑所需的冲击能量增大了24%~46%。而对于内部分层,在一定的冲击能量范围下,加表面防护层的层板的C扫分层面积比裸板减小了20%~50%,而在同样凹坑深度的情况下,层板在加了表面防护层之后分层面积变化不大。冲击后压缩性能与内部分层情况具有较大的关联性,同样冲击能量下分层面积较小的各组带表面防护层板,其冲击后压缩强度和破坏应变相对于裸板的提高在15%~50%之间,而在凹坑深度相同的情况下,二者的冲击后压缩强度和破坏应变相差不大。
Experimental study on the low-speed impact and post-impact compression of domestic carbon fiber / toughened epoxy resin CCF300 / 5228A with surface protective layer increased. Through the falling-weight low-speed impact test, the contact force history, pit depth and internal delamination area of each group of laminates were obtained. The post-impact compression test results could be used to study the damage tolerance performance of each group of laminates Evaluation. The results show that the laminates with the surface protection layer have a little change in initial load, but the impact energy required to form the same 1.0mm pits has increased by 24% -46% compared with the bare board. For the internal stratification, the C-scan stratification area of the laminate with the surface protection layer is reduced by 20% -50% compared with the bare board under a certain range of impact energy, while in the case of the same pit depth, the layer After adding a layer of surface protection layer layered little change. After impact compression performance and the internal stratification has a greater relevance, the same impact energy stratified area smaller groups with surface protection of the board, after the impact of compression strength and failure strain relative to the bare board increase 15 % ~ 50%, while in the case of the same pit depth, the post-impact compressive strength and failure strain of the two have little difference.