Validation of DSD Relations for RDX‐TNT‐Based Cast Explosives for Lower Diameters and Dn–κ Surface Equation

In this paper, we extended our work on RDX and TNT‐based explosives to lower diameter to validate detonation shock dynamics (DSD) first‐order relationships between normal detonation velocity D_n and detonation wave curvature κ. At 25 mm diameter, we observed that D_n–κ relationship approximates, although not perfectly, the relation for 50 mm diameter. Thus to an approximation, the first order DSD theory is independent of geometry. On that basis, a general equation has been proposed, which can predict D_n–κ for RDX/TNT cast explosives in the mixing ratios 60 : 40–40 : 60.     

压力管道用金属波齿结构力学性能研究

304不锈钢波齿结构是柔性石墨金属波齿复合垫片骨架,其力学性能对垫片压缩-回弹性能有显著的影响,在45MPa轴向压紧应力下,采用弹性有限元法对钢板厚度为2mm,具有3种不同的圆弧半径、波齿距和齿数的波齿进行应力分析,找出304不锈钢材料几何结构与应力应变的关系,为工程实践提供科学指导。