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Damage characteristics of ship structures subjected to shockwaves of underwater contact explosions.pdf

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Damage characteristics of ship structures subjected to shockwaves of underwater contact explosions.pdf

Ocean Engineering 117 (2016) 359–382 Contents lists available at ScienceDirect Ocean Engineering journal homepage: /locate/oceaneng Damage characteristics of ship structures subjected to shockwaves of underwater contact explosions F.R. Ming, A.M. Zhang n, Y.Z. Xue, S.P. Wang College of shipbuilding engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China article info Article history: Received 26 August 2015 Received in revised form 18 December 2015 Accepted 12 March 2016 Available online 4 April 2016 Keywords: Underwater contact explosion Full SPH method Coupling SPH-FEM Fluid and structure interaction Shockwave Combined damage variable abstract The damage process of ship structures subjected to underwater contact explosions is characterized by strong nonlinearity, thus there are great challenges in solving such problems. Firstly, the full Smoothed Particle Hydrodynamics (SPH) method for the ?uid and structure interaction (FSI) is established based on compressible SPH ?uid dynamics and SPH shell. Furthermore, the normal ?ux method is introduced to treat the interface. However, given the immaturity of the SPH shell in dealing with the fracture of complex structures, an SPH-FEM (Finite Element Method) coupling method for FSI is proposed with the “glue” treatment applied at the interface. The above two methods are veri?ed by an underwater contact explosion experiment. Afterwards, the pressure-time relationship within six charge radii is ?tted based on the axisymmetric SPH simulation. On this basis, the ?at plates subjected to underwater contact explosions are studied in detail with the application of a combined damage variable. Three stages in the damage process, namely localized bulging, discing and petaling, are observed, and the crack and de?ection are found to be sensitive to the changes of peak pressure and impulse respectively. Finally, complex models of a stiffened plate and a ship are established to further study the damage characteristics