层状梯度B4C/Al复合材料应力波传播特性及抗弹机理研究

功能梯度材料性能可设计和阻抗匹配性好，成为未来重点发展的一类装甲材料。梯度材料的本构模型、应力波传播特性和冲击损伤机制是其结构优化和应用的关键。本项目围绕功能梯度装甲材料设计和优化中的科学问题展开。阐明应变速率、温度对高体分B4C/Al复合材料动态性能的影响规律，完善宽体分B4C/Al复合材料动态本构模型；将改进的霍普金森压杆试验技术与数值模拟相结合，揭示梯度界面结构和梯度分布构型对层状梯度B4C/Al复合材料应力波传播特性及损伤演化的影响规律；结合宏微观损伤机制、应力波传播特性和数值模拟揭示层状梯度B4C/Al复合材料的抗弹机理。为功能梯度装甲材料的设计和应用提供理论支撑。

Functionally graded materials (FGMs) have become one of the important development trends of future armor materials due to excellent designability and good acoustic impedance matching. The complex constitutive model, stress wave propagation characteristics and impact damage mechanism are the keys to the structural optimization and application of FGMs. This project focuses on the scientific problems in the design and optimization of FGMs. A constitutive model that accurately describes the dynamic performance of B4C/Al composites will be established by revealing the influence of strain rate and temperature on the dynamic properties of B4C/Al composites with high B4C content. The influence of gradient interface structure and gradient distribution configuration on the stress wave propagation characteristics and damage evolution of layered gradient B4C/Al composites will be elucidated by the improved split hopkinson pressure bar test technology and numerical simulation. The ballistic mechanism of layered gradient B4C/Al composites will be revealed by combining with macro and micro damage mechanism, stress wave propagation characteristics and finite element analysis. The implementation of this project can provide theoretical and experimental supports for the design and application of FGMs .