FRC 层合板抗高速冲击机理研究

基于纤维增强复合材料( FRC) 层合板高速冲击下横向变形及破坏模式的分析, 根据冲击动力学理论和应力波传播特性, 建立了FRC 层合板柱形弹高速冲击下的两阶段(剪切侵彻和连续侵彻) 侵彻动力学分析模型。采用瞬态梯度变形锥理论分析了连续侵彻阶段的弹、靶相互作用, 并编制相应计算程序, 通过计算结果与实验测试结果的综合比较, 弹体初速在300～900 m/ s 范围内, 剩余速度误差小于50 m/ s , 验证了两阶段侵彻模型的适用性和稳定性, 分析了实验现象, 如梯度变形锥、背层花瓣开裂和面背层破坏模式差异等的产生及形成机理, 提出了提高现有层板结构抗弹性能的新途径, 如降低层间粘结强度、提高面层纤维的抗剪能力等。

Ball istic protective mechanism of FRC laminates

According to the analysis of deformation and damage model of FRC laminates after ballistic impact , atwo phase theoretical penet ration model was presented , based on the impulsive dynamics and st ress wave propagation analysis , which includes a shear penet ration phase and the consecutive penet ration phase. The transient t rapezium deformation cone model was int roduced firstly in this article , and the interaction between projectile and targetin the consecutive penet ration phase was discussed by this model. The calculation code by V2Fort ran was compiledand the calculation result s were perfect compared with experimental result s. When the initial velocity is 300 ～900 m/ s , the difference is less than 50 m/ s. The emergence and come-into-being mechanisms of some experimentalphenomena , such as t rapezium deformation cone , petal breakage on back face and the difference in the damage modelbetween FRCps f ront and back faces , have been made clear now , and some new ways and rules , which can be infavor of improving ballistic resistance capability of FRC , are put forward , such as : reduce the content of mat rix andthe interlaminate st rength or increase the shearing resistance of f ront layers , etc.