中文摘要：

采用落锤冲击试验系统对平纹编织碳纤维增强碳化硅复合材料平板试样进行低速冲击,冲击能量为1.5～9J。冲击试验后,采用超声C扫描得到冲击损伤的大小。对含冲击损伤的试样进行压缩试验,通过与未冲击试样的压缩强度比较,得到冲击试样的剩余压缩强度。并对比了编织陶瓷基复合材料和树脂基复合材料的损伤阻抗和损伤容限。结果显示：随着冲击能量的增加,冲击力峰值、复合材料损伤面积和凹坑深度明显增加,到达峰值冲击力的时间减小。冲击能量的增加会导致冲击损伤面积的增加,而损伤面积的增加会导致剩余压缩强度的明显降低。相对于编织纤维增强树脂基复合材料,编织纤维增强陶瓷基复合材料的损伤阻抗较低,但损伤容限较高。

英文摘要：

An experimental study was carried out to investigate the low-velocity impact characteristics and the strength after impact of plain woven carbon fiber reinforced silicon carbide composite.The test specimens were impacted using a dropped-weight impact test apparatus with an instrumented spherical tip.Non-destructive test methods were then utilized to characterize and quantify the impact damage.The residual compressive strengths of composites after impact were determined.The impact damage resistance and tolerance of woven fiber-reinforced ceramic-matrix composite were compared with those of woven fiber-reinforced polymer-matrix composite.The results show that a circular indentation on the impacted surface of specimens is formed in the impact.The peak load and the diameter and depth of indentation increase with the increase of the impact energy.The time reached to impact the peak load decreases with the increase of impact energy.According to observation of optical photographs and the image characteristics of samples obtained by ultrasonic C-scan after impact,the impact damage areas increase with the increase of impact energy.With the increase of impact energy the residual compressive strength obviously decreases due to the increase of damage size.At the impact energy of 1.5 J,the residual compressive strength of the composite decreases to 79% of the original values,but its residual compressive strength only retains 55% of the original values at 9 J.The woven carbon-fiber-reinforced SiC-matrix composite shows lower impact damage resistance but higher damage tolerance relative to fabric reinforced polymermatrix composites.