ABSTRACT
A dynamic solution was then derived considering the strain rate effects. The theory of the dynamic plastic hinge was introduced. An accurate evaluation of the load-time history requires a study of the external dynamics, taking into account the ship's mass as well as hydrodynamic effects. Typical damages of a ship's bow structure during collision are folding, tearing and bending of plating and inner stiffeners. Most of the available methods are generally related to a quasi-static solution, which seemed acceptable due to the low velocity of the ship during collision. The chapter analyses the strain rate at a plastic hinge to estimate dynamic energy dissipation of ship structures using the theory of plastic hinge. Based on the theoretical and experimental studies of a simple beam model under dynamic pure bending, Lehmann & Yu used the dynamic plastic hinge theory to study the strain rate effect. The new solution was derived without empirical approximation of strain rate.
