A two-step iterative method for damage calculation of a ship hullsubjected to underwater close-up non-contact explosion

REN Kai; ZHOU Hongjing; YANG Chen

doi:10.11883/bzycj-2022-0116

Volume 43 Issue 4

Apr. 2023

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REN Kai, ZHOU Hongjing, YANG Chen. A two-step iterative method for damage calculation of a ship hullsubjected to underwater close-up non-contact explosion[J]. Explosion And Shock Waves, 2023, 43(4): 044201. doi: 10.11883/bzycj-2022-0116

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A two-step iterative method for damage calculation of a ship hullsubjected to underwater close-up non-contact explosion

doi: 10.11883/bzycj-2022-0116

College of Power Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China

Received Date: 2022-03-24
Rev Recd Date: 2022-08-16

Available Online: 2022-09-09

Publish Date: 2023-04-05

Abstract

Abstract

The calculation of the break of ship hull caused by underwater close-range non-contact explosion is a complex process, involving many factors such as the hull frame, weapon charge, explosion distance and orientation, etc., so empirical formulas are usually used in engineering design. If the ship is attacked by a directional warhead, it is usually assumed that the damage surface is approximately perpendicular to the damage axis, and the explosion process instantaneously meets the basic condition on approximate energy conservation, then the calculation method is proposed according to the assumption that the initial kinetic energy of the explosion shock wave is equally transmitted to the plastic deformation energy of the structure in the explosion action area. Considering the effect of the equivalent thickness of the hull shell-plate attached with stiffeners on the resistance to shock wave damage, and using the fundamental principle that cracking of the shell plate will take place when the ultimate strain of the hull plate under the action of explosion shock wave exceeds the dynamic ultimate strain of the plate, the calculation flow of the two-step iterative method is designed, and a simple and easy-to-use iterative calculation table is given. 768 sets of data are calculated for the damage of hull shell-plates with the typical thicknesses of 6 mm and 8 mm under the action of four typical charge equivalent shock waves, with an explosion distance within 11 m, acting on a compartment with 5-20 m span. By introducing the plane fitting equation, the applicability criterion of the calculation method is given by judging the similarity analysis of the section plane, and the valid range of the calculation parameters is discussed to ensure that the two-step iteration method can objectively reflect the actual damage effect of the underwater short-range non-contact explosion. Combined with the calculation results of empirical formulas and the measured data of damaged ships, the method is verified. The practice shows that the two-step iterative method is easy for engineering practice and has good accuracy.
- warship survivability,
- hull damage,
- underwater close-up explosion,
- breach calculation

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