Simplified buckling-and-contact-based expansion method for assessment of crashworthiness of double-hulled ship structure

• Published in: Marine structures 2020-05, Vol.71, p.102719-24, Article 102719
• Main Authors: Ju, Han-Baek, Jang, Beom-Seon, Choi, Junhwan, Kim, Jung, Jun, Sang-Bae
• Format: Article
• Language: English
• Subjects: Buckling; Crashworthiness; Damage prevention; Deformation; Double hulls; Double-hulled structure; Energy-absorption capacity; Environmental degradation; Expansion; Failure modes; Impact strength; Mathematical models; Minimum potential energy principle; Numerical methods; Numerical simulation; Shape; Ship collision; Ships; Simplified method; Structural damage
• ISSN: 0951-8339; 1873-4170
• DOI: 10.1016/j.marstruc.2020.102719

Ship-to-ship collision events can have severe consequences such as loss of life and environmental degradation. For this reason, modern ship designs are required to incorporate a double-hulled structure to prevent inner-hull damage from such events. Using the experimental or numerical method to analyze the crashworthiness of double-hulled ship structures entails much effort, for which reason neither method is easy to adopt at the early design stage. In this paper, an existing simplified method called Ito's method is improved by a new buckling-and-contact-based expansion method. This method can be applied to double-hulled-structure or outer-hull-local-rupture failure mode. The perpendicular bow-to-side collision scenario is assumed for a conservative estimation of damage to a double-hulled structure. The method was verified in the present study by numerical ship collision simulations of several cases. The results for the buckling-and-contact-based expansion method and numerical simulation were similar for a blunt shape of striking body but different for a sharp shape. •A previous method is improved to a new buckling-and-contact-based expansion method based on the minimum total potential energy principle.•It can provide buckling path for all feasible scantlings of a double-hulled structure considering the effect of partial failure of side shell unit.•The geometric information on the striking body is utilized to judge the contact between the striking body and the boundary girders.•Two types of ships' bow are modeled, and numerical simulations were performed to validate the proposed method.