A Theory for Critical Loads to Damage a Cylindrical Shell by a Large Underwater Explosion.

摘要

A theory is presented for determining critical loads for cylindrical shells subjected to large underwater explosions. The theory treats dynamic elastic-plastic buckling with fluid-structure interaction caused by a transverse incident pulse in water. The approach is by modal analysis with the displacement and velocity distributions at the end of the initial elastic response forming the initial conditions of the subsequent plastic response. The transition from elastic to plastic response is determined by the hoop mode. Experimental and theoretical final deformed shapes and pressure histories are similar. The response of a stiffened shell to a rectangular pressure pulse is characterized by isodamage curves in the pressure-impulse plane. Results show steep damage gradients when pressures and durations exceed the values that cause incipient damage,which is in agreement iwht experimental observation. (Author)