Response of a Thin Cylindrical Shell under Lateral Impulse Loads.

摘要

In support of the current directed energy weapons program investigating lethality levels of short pulse width lasers, a combined analytical/experimental program has been underway to predict large deformation response of conceptual ballistic missile designs to impulsive loading. Both unpressurized cyclindrical shell models have been anaylzed and tested. Such impulsively loaded structures exhibit large scale plastic deformation and local dynamic pulse buckling instability which subsequently influence the loaded surface collapse. Impulse loads were simulated using both lead spray and light initiated high explosive techniques. Finite element calculation using a modified form of the Hughes-Liu shell element verify several characteristics of the structural response observed in experiments. The role of the computational results in identifying lethal impulse levels and response modes is described. In addition, the requirements for initial imperfections and fine mesh discretization for these problems are discussed. (ERA citation 13:037630)