The response of a coated cylinder (metallic cylinder coated with a rubber material)subjected to an underwater explosion is analyzed numerically. The dynamic responseof the coated cylinder appears to be adversely affected when impacted by an underwatershock wave under certain conditions of geometry and material properties of thecoating. When adversely affected, significant deviations in values of axial stress, hoopstress, and strain are observed. The coated cylinder exhibits a larger deformation andhigher internal energy in the metallic material. Rubber coatings appeared to inhibitenergy dissipation from the metallic material to the surrounding water medium. Aparametric study of various coatings was performed on both aluminum and steelcylinders. The adverse effect of the coating decreased when the stiffness of the rubberlayer increased, indicating the existence of a threshold value. The results of this studyindicate that the stiffness of the coating is a critical factor to the shock hardening ofthe coated cylinder.
展开▼
