Impact response and damage evolution of triaxial braided carbon/epoxy composites. Part II: finite element analysis
Impact response and damage evolution of triaxial braided carbon/epoxy composites. Part II: finite element analysis
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DOI：
10.1177/0040517512474364
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发表时间：
2013-02
影响因子：
2.3
通讯作者：
Liu Lulu;Xu Haijun;Zhang Na;Chen Guangtao;Feng Yiming;Hong Weirong
中科院分区：
文献类型：
--
作者：
Liu Lulu;Xu Haijun;Zhang Na;Chen Guangtao;Feng Yiming;Hong Weirong
本文第一部分介绍了一系列三轴编织碳/环氧复合材料的弹道试验。在这一部分中，对这些复合材料的冲击响应、损伤演化和侵彻机理进行了数值模拟研究。建立了连续介质有限元模型，得到了弹丸撞击过程中速度、位移、侵彻阻力和能量吸收的时间历程。通过对数值数据进行拟合，可以得到弹道极限速度。数值计算结果与实验结果吻合较好。对复合材料弹道试验的数值预测表明，根据损伤机制和破坏特征的变化，冲击过程可分为冲击压缩阶段、鼓包变形阶段和侵彻过程阶段，其中第二阶段消耗了大部分动能。文中还详细讨论了叶片形弹丸与圆柱形弹丸在撞击过程中的不同之处。
A series of ballistic tests on triaxial braided carbon/epoxy composites were described in Part I of this paper. In this part, numerical simulations were carried out to investigate the impact response, damage evolution, and penetration mechanisms of these composites. A continuum finite element model was developed to obtain the time history of the projectile velocity, displacement, penetration resistance force, and energy absorption during the impact process. By fitting the numerical data, the ballistic limit velocity can be obtained. Good agreements were achieved between numerical results and experimental results. Numerical predictions for ballistic tests of the composites indicate that, based on variations of damage mechanisms and failure features, the impact process can be subdivided into three stages, i.e. phase I – shock compression, phase II – bulge deformation, and phase III – penetration process, among which phase II consumes most of the projectile kinetic energy. The differences between a blade-like projectile and a cylindrical projectile in the impact process are also addressed in detail.