Computational and Experimental Determination of Fragmentation for Naturally Fragmenting Warheads

摘要

A computational and experimental investigation of the fragmentation response of Armco iron and HF-1 steel explosively filled cylinders and an HF-1 steel projectile is presented. SRI International Lagrangian finite-difference stress wave propagation codes that contain brittle fracture and shear banding models were used for the computational simulations. Gas gun Hugoniot and soft-recovery experiments were performed for HF-1 steel to determine input parameters for the brittle fracture model. Cylinder and projectile fragment mass distributions were experimentally determined for comparison with the simulations. Cylinder computations and experiments were performed for two heat treatments of HF-1 steel to investigate microstructural changes on the fragmentation behavior. Computed stress, particle velocity, and crack concentration histories are presented for an HF-1 steel cylinder. A scheme was devised for characterizing the recovered fragments from the cylinder and projectile experiments with respect to their fracture surfaces. (Author)