PBX代用材料动态力学行为和微观结构的实验研究

Experimental Study on the Microstructures and Dynamic Behavior of a PBX Substitute Material

研究了固体炸药PBX代用材料D-90031的微观结构、压制过程中产生的原生缺陷形态,以及动态力学行为和破坏特征。采用数字图像分析技术、纳米力学测试系统,以及分离式霍普金森压杆(SHPB)实验和落锤冲击技术,获得了微观结构特点、各组分的硬度和弹性模量、动态性能,以及碎片的尺寸分布规律和材料的破坏形式。研究发现,晶粒的形态随外载的作用而改变,晶粒沿垂直加载方向伸长,材料的碎块尺寸满足一定的规律。研究结果对于深入认识固体炸药的性能与微观结构的关系具有一定的指导意义。

The microstructures and intrinsic defects engendered during the compression process of manufacture of a PBX substitute material D-90031, as well its dynamic behavior and failure mechanisms were studied. By using digital image treatment technique,in-situ nano-indenter system,Split Hopkinson Pressure Bar（SHPB） and weight dropping tests,we obtained the features of microstructures, modulus and hardness of each constituent, dynamic properties, as well as the size distribution of pieces and failure modes. It was found that the grain shape changed with the applied compressive load, such as the grain was elongated along the direction vertical to the load application direction. The size distribution of pieces after impact meets a certain statistical rule. The results obtained are meaningful to deeply understand the relationship between the properties and microstructures of solid explosive.