复合材料层压板低速冲击行为及剩余拉伸强度

通过实验研究了复合材料层压板的低速冲击行为和剩余拉伸强度。首先，通过冲击实验研究了冲头类型和铺层形式对层压板冲击响应的影响，并通过凹坑深度、损伤投影面积、冲击力和冲击能量转化等对冲击损伤特性进行评估。其次，通过准静态拉伸实验调查了层压板的冲击后拉伸响应和剩余拉伸强度。最后，分析了冲头类型和铺层形式对层压板冲击行为和剩余拉伸强度的影响机理。结果表明:冲头类型对层压板冲击损伤的影响与冲击接触面投影面积和凹坑深度的函数关系密切相关；在较高的冲击能量下，条刃形冲头是造成损伤的关键冲击威胁，而立方角形冲头造成的损伤相对不严重；铺层形式对层压板的冲击损伤阻抗性能和拉伸断裂形貌有明显的影响。 

Low-velocity impact behavior and residual tensile strength of composite laminates

The low-velocity impact behavior and residual tensile strength of composite laminates are experimentally studied in this paper. Firstly, the effects of impactor type and layup type on the impact responses of laminates are investigated by impact tests, and damage characteristics are evaluated by using the dent depth, damage projection area, impact force and impact energy translation. Secondly, the tensile response and residual tensile strength of the laminates after impact are investigated by quasi-static tensile tests. Finally, the mechanism of the effects of impactor type and layup type on the impact behavior and residual tensile strength of the laminates are analyzed. The results indicate that: the effect of impactor type on impact damage of composite laminate is closely related to the function of the projection area of impact contact surface with the dent depth; under the condition of high impact energy, the strip impactor is a critical impact threat to damage, while the damage caused by corner impactor is relatively not serious; the type of layup has a remarkable influence on the impact damage resistance performance and tensile fracture morphology of the laminates.