ABSTRACT
Oblique side collisions are found more frequent among the ship side collision accidents while most analytical methods are for head-on collision analyses. This paper proposed a new analytical method to predict the deformation resistance of a stiffened plate in the oblique tearing process. The plating structure is divided into three types of structural members and the simplified analytical model of each member is decided according to the observed plastic deformation mechanisms from numerical simulations. The newly proposed method accounts for the coupling effects between stiffeners and the bare plate by theoretically modifying the formula of radius of curved cylindrical of the plate during the tearing process. Finally, the total resistance is obtained by summing up the results of all the structural members. The analytical method is verified through the comparison with the results from numerical simulations. A single-hulled service vessel is selected to be impacted by a rigid raked bow. The tearing resistance of the deck structure calculated by the proposed method agrees well with that from numerical method. The analytical method is further compared with existing formula combining equivalent thickness method, and it is found that the newly proposed method can give better prediction, especially in the severe collisions with large indentation, because the possible coupling effects between structural members can be captured.
