Debris Cloud Material Characterization for Hypervelocity Impacts of Single- and Multi-Material Projectiles on Thin Target Plates
Final rept. Jun-Sep 1993
ALABAMA UNIV IN HUNTSVILLE DEPT OF CIVIL AND ENVIRONMENTAL ENGINEERING
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The response of a target to a KEW impact can be said to consist of local and global phenomena. For KEW impacts, damage associated with local response occurs very quickly and is limited to a volume immediately adjacent to the impact site. Global response can refer to any one of a number of phenomena that occur over a longer period of time, under less intense loads, and over a much larger area of the target. In KEW impacts, one or more debris clouds are created during the initial impact on the outer wall of a target. These debris clouds can contain solid, melted, and vaporized projectile and target materials. The levels of melt and vaporization within the debris clouds determine the loads transmitted to various internal target components. To accurately determine total target damage, a lethality assessment scheme must include the effects of discrete impacts by solid fragments as well as impulsive loadings due to molten and vaporous debris cloud material. Thus, the amount of material in each of the three states of matter must be known to accurately assess total target damage and break-up. This report presents a first-principles method to calculate the amount of material in a debris cloud created by a perforating hypervelocity impact that is solid, molten, and vaporous, the debris cloud leading edge, trailing edge, center-of-mass, and expansion velocities, and the angular spread of the debris cloud material. The method presented can be used for single- and multi-material solid rod projectiles impacting thin target plates. The methodology presented in this report includes, improves, and expands upon the debris cloud characterization scheme presented in WL-TR-93-7028. The predictions of this methodology are compared against those of empirically-based lethality assessment schemes and against numerical and empirical results.
- Nuclear Explosions and Devices (Non-Military)