通过2D C/SiC复合材料的低速冲击试验和冲击后压缩试验, 以及超声C扫描和红外热波两种无损检测方法, 研究了冲击能量与冲击损伤的关系及其对压缩性能的影响. 结果表明：C/SiC具有较好的损伤容限能力, 冲击能量低于1.5J时几乎无目视损伤, 高于9J时有被击穿的趋势. 冲击后的名义压缩强度和压缩模量随着冲击能量的增加呈下降趋势, 最多分别下降了44.7%和16.9%.
Low velocity impact (LVI) damage behavior of 2D C/SiC composite was experimentally investigated. C/SiC laminates were impacted under various energy levels ranging from 1.5J to 9J by a dropping hammer. Impact damages were characterized by surface measurement and two nondestructive test (NDT) methods, which were ultrasonic C-scan and infrared thermal wave. The effect of impact energy on post-impact compressive performance was studied by static compress test. The results indicate that C/SiC behaves in a damage tolerant manner. While damage is produced under very low energy, but it is bounded in a limited area and no catastrophic failure occurs under all energy levels. LVI damage area increases with the impact energy. After impact of 1.5J, nearly no visible damage is found. When the impact energy increases to 9J, the specimen is nearly penetrated. LVI is a great threaten to the loading capacity of C/SiC, since the nominal compressive strength and modulus decreases maximum to 44.7% and 16.9%, respectively.
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