锻纹机织复合材料高速冲击试验研究及理论分析

Experimental study and theoretical analysis on high velocity impact of satin woven carbon fiber reinforced composites

为了研究1种碳纤维增强锻纹机织复合材料的弹道冲击破坏机理,使用钛合金圆柱弹体进行了弹道冲击试验,并对冲击过程进行了理论分析。结果表明:复合材料靶板在平头圆柱弹体冲击下,失效模式在冲击面主要是纤维剪切失效和基体压溃,失效模式在靶板背面主要是纤维拉伸失效、基体开裂、纤维拔出和分层失效;由于纤维正交铺设特性,靶板背面的损伤区域为菱形。基于试验中对复合材料靶板损伤模式和损伤区域的的观察,提出了理论分析模型,认为弹体能量消耗主要是通过层合板压溃、动量转移、纤维的拉伸断裂失效和剪切充塞吸能,建立了弹体冲击靶板过程能量变化的微分方程,理论分析模型可以有效预测复合材料靶板的弹道极限。

To invesitgate the failure mechanism of ballistic impact satin woven carbon fiber reinforced composites,ballistic impact tests were conducted using flat-ended cylindrical titanium projectile and theoretical analyses on the impact process were carried out.Experimental results and theoretical analyses indicated that the failure modes of this composite structure impacted by the projectile were fiber shear fracture and matrix crushing failure in the impact surface of the target plate,and fiber tensile fracture,matrix cracking,fiber pull-out and delamination in the back of the target plate.Due to the orthogonal layout of the fibres,the damage area in the back of the target plate takes on diamond shape.Based on the observation of damage modes and damage region of the composite target plate in the tests,analytical model was proposed,which indicates that the energy consumption is mainly by laminate crushing,momentum transfer,fiber tensile fracture and shear plugging.And the energy differential equation was established,which can predict the ballistic limit of the composite target effectively.