ABSTRACT

A commonly assumed ship-to-ship collision scenario is a rigid ship bow hitting the side of a ship perpendicularly. A bulbous bow has a slender shape overall but a rounded end, while a stem has a sharp horizontal edge but a gently sloping body. It was found from numerical simulations that the stem collision induces horizontal shear failure on side shell as soon as the stem contacts with the side shell. Also, progressive deformation was observed only at the lower part of side shell as the contact extended downward. Based on the present research, a simplified method for the stem collision case, named a contact-based segment-expansion (CBSE) method, herein is proposed. This method reflects the progressive collapse of side shell and considers the strain energy absorbed by the boundary girders. The validity of the method was verified from the numerical simulations in terms of energy-absorption capacity of the double-hulled structure.

摘要

通常假设的船对船碰撞场景是刚性船首垂直撞击船侧。球根弓整体形状细长，末端呈圆形，而茎具有尖锐的水平边缘，但身体略微倾斜。从数值模拟中发现，一旦阀杆与侧壳接触，阀杆碰撞就会导致侧壳发生水平剪切破坏。此外，随着接触向下延伸，仅在侧壳的下部观察到渐进变形。在此研究的基础上，本文提出了一种简化的干碰撞情况下的方法，称为基于接触的分段扩展（CBSE）方法。该方法反映了侧壳的逐渐倒塌，并考虑了边界梁吸收的应变能。