基于SHPB试验的B4C/Al复合材料动态力学性能研究[*]

Study on dynamic mechanical properties of B4C/Al composite ceramics based on the SHPB

摘要:

B4C/Al是一种新型金属复合陶瓷材料，相比于传统陶瓷材料，B4C/Al 复合材料具有低密度、高硬度、高韧性、低成本等优点，常被应用于装甲防护领域。为研究B4C/Al复合材料在动态加载下的力学性能，论文通过分离式霍普金森压杆（SHPB）实验和电镜扫描（SEM）等技术，获得了材料在不同冲击速度下的典型波形图、应力应变曲线，以及微观环境下的断口形貌；研究了不同应变率下材料的应力应变曲线特征和破坏模式，同时讨论了Al含量对材料的动态压缩强度的影响规律。研究结果可为B4C/Al复合材料的设计和应用提供参考。

Abstract:

As a novel composite ceramic, B4C/Al has been widely used in the lightweight protective armour due to its excellent physical properties such as high hardness, high fracture toughness, and low density. In order to obtain the mechanical properties of B4C/Al composites under dynamic loading, the waveforms under different impact speeds and the fracture morphology with the split Hopkinson pressure bar (SHPB) testing and electron microscope scanning (SEM) has been performed, as well as the stress-strain curve characteristics and failure modes of the materials under different strain rates. Furthermore, the influence of Al content on the dynamic compressive strength of the material has analyzed. The results can provide reference for the design and application of B4C / Al composites.