碳纤维增强塑料是近几年新兴的优异轻质材料，被广泛用于汽车、电子、电器等行业的外壳零件，这些零件在使用过程中经常有被撞击或跌落的风险，所以对产品的抗冲击性能要求非常高。为了加深对短切碳纤维增强塑料抗冲击性能的了解，以短切碳纤维增强 PA66 平板为研究对象，开展落锤冲击试验。对试验后的损伤断口进行超声形貌检测和 SEM 断面形貌检测，通过研究平板冲击损伤模式和冲击过程位移－冲击载荷曲线，对比分析碳纤维含量对短切碳纤维增强 PA66 平板损伤行为和抗冲击性能的影响。结果表明: 冲击过程中碳纤维增强 PA66 平板中除了尼龙基体的断裂和裂纹扩展外，还发生了纤维拔出和纤维断裂; 随着碳纤维含量的增加，塑料平板冲击损伤面积和裂缝数目显著减小，比吸能显著提高，材料的抗冲击性能显著提高。

Carbon fiber reinforced plastics is a kind of high-quality lightweight materials emerged in recent years．They are widely used in the shell parts of the automotive，electronics，electrical appliances and other industries．These parts often have the risk of being hit or dropped in the process of use，therefore high impact resistance is re-quired． In order to deepen the understanding of the impact resistance of short-cut carbon fiber reinforced plastics，the drop impact test was carried out on short-cut carbon fiber reinforced PA66 sheets． The UT ultrasonic morpholo-gy test and SEM cross-section topography test were performed on the damaged fracture． What's more，the effect of carbon fiber content on the damage behavior and impact resistance of plastic sheets was analyzed by comparing the plate impact failure mode and the displacement-impact force curve． The results show that，in addition to the frac-ture and crack expansion of the plastic matrix，the fiber pull-out and fiber fracture occur in the short-cut carbon fi-ber reinforced PA66 sheets． With the increase of carbon fiber content，the impact damage area and crack number
of the plastic plate are notably reduced，The specific energy absorption and impact resistance of the material are both significantly improved．