Extent of damage analysis of naval ships subject to internal explosions

• Published in: International journal of naval architecture and ocean engineering Vol. 15; pp. 100514 - 15
• Main Authors: Kwak, Myo Jung, Yoon, Joon Young, Park, Sayyoon, Kwon, Seungmin, Shin, Yun-Ho, Noh, Yoojeong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2023; Elsevier; 대한조선학회
• Subjects: Extent of damage; Internal explosion; Naval ship; Survivability; Vulnerability assessment; 조선공학; P–I; UFC; FLACS; Naval ship; JRC; Extent of damage; Survivability; Internal explosion; Vulnerability assessment; FE
• ISSN: 2092-6782; 2092-6790
• DOI: 10.1016/j.ijnaoe.2023.100514

A well-balanced naval ship design to enhance the survivability from the initial design stage in parallel with other designs focusing on the major function and its inherent mission is considered as a desirable design trend in ROK navy since Cheonan sinking accident. Because it is difficult to estimate a hit location of a given threat for survivability evaluation, a statistical approach based on multiple-hit scenarios is frequently addressed, and it is necessary to accomplish rapid analyzes considering the tight design schedule. In addition, accurately estimating the extent of damage caused by the given threat is also an important matter to secure the reliability of evaluation. In particular, the empirical formula-based damage extent estimation method, which is frequently used for initial rapid vulnerability analysis, has limitations in not faithfully reflecting the latest technology advances such as hull design changes and diversification of threats, so researches on this have been continuously accomplished. In this study, a method for analyzing the extent of damage was developed considering the structural response of a ship to damage under a blast load. The proposed method quickly and easily calculates the extent of damage using physical design parameters together with the accurate analysis results and is also very effective at the initial design stage of the naval ship (e.g., in evaluating various design candidates for structural configurations). To show the effectiveness of suggested method, FLACS, a well-known commercial program for explosion analysis, is used for the analysis of nine representative scenarios together with the stepwise validations of the suggested procedure; the analysis results are observed the same in most cases with the developed program based on the proposed procedure, with a difference of approximately 15% for one scenario.
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•Establishment of a theory for more accurately predicting the extent of damage considering the physical features of structural response and internal explosions•Suggestion of analysis procedure for reflecting the gradual structural damage of naval ship•Implementation of the suggested procedure for use in the initial design stage•Validations of the procedure through the detail explosive analysis and available experimental data