Damage Characteristics of Ship Structures Subjected to Shockwaves of Underwater Contact Explosions

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 fluid and structure interaction (FSI) is established based on compressible SPH fluid dynamics and SPH shell. Furthermore, the normal flux 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 verified by an underwater contact explosion experiment. Afterwards, the pressure-time relationship within six charge radii is fitted based on the axisymmetric SPH simulation. On this basis, the flat 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 deflection 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.

[1]  Alain Combescure,et al.  An SPH shell formulation for plasticity and fracture analysis in explicit dynamics , 2008 .

[2]  Feng Fan,et al.  Dynamic Constitutive Relation and Fracture Model of Q235A Steel , 2013 .

[3]  K. Narasimhan,et al.  Damage prediction of clamped circular plates subjected to contact underwater explosion , 2001 .

[4]  R. P. Ingel,et al.  STRESS POINTS FOR TENSION INSTABILITY IN SPH , 1997 .

[5]  Zhu Xi.  Crevasse Experiment Research of Plate Membrance in Vessels Subjected to Underwater Contact Explosion , 2003 .

[6]  A. Colagrossi,et al.  Numerical simulation of interfacial flows by smoothed particle hydrodynamics , 2003 .

[7]  M. Langseth,et al.  Ballistic penetration of steel plates , 1999 .

[8]  E. Stein,et al.  On the parametrization of finite rotations in computational mechanics: A classification of concepts with application to smooth shells , 1998 .

[9]  张阿漫,et al.  Investigation on charge parameters of underwater contact explosion based on axisymmetric SPH method , 2014 .

[10]  C. P. Vendhan,et al.  Experimental and Numerical Investigations on Deformation of Cylindrical Shell Panels to Underwater Explosion , 2001 .

[11]  C. Vendhan,et al.  Deformation and rupture of thin rectangular plates subjected to underwater shock , 2004 .

[12]  T. Wierzbicki,et al.  Fracture prediction of thin plates under localized impulsive loading. Part I: dishing , 2005 .

[13]  T. L. Geers,et al.  An integrated wave-effects model for an underwater explosion bubble. , 2002, The Journal of the Acoustical Society of America.

[14]  T. Belytschko,et al.  DYNAMIC FRACTURE USING ELEMENT-FREE GALERKIN METHODS , 1996 .

[15]  A. Zhang,et al.  Total Lagrangian particle method for the large-deformation analyses of solids and curved shells , 2014 .

[16]  Joseph J Monaghan,et al.  An introduction to SPH , 1987 .

[17]  N. Jacob,et al.  Scaling aspects of quadrangular plates subjected to localised blast loads—experiments and predictions , 2004 .

[18]  Zhang A-Man,et al.  Numerical simulation of underwater contact explosion , 2012 .

[19]  Li Shi-ming.  Damage Study on Ship Plate Frame Subjected to the Underwater Contact Explosion , 2012 .

[20]  Jun Li,et al.  Experimental and numerical investigation on a multi-layer protective structure under the synergistic effect of blast and fragment loadings , 2014 .

[21]  Guirong Liu,et al.  Smoothed Particle Hydrodynamics: A Meshfree Particle Method , 2003 .

[22]  Andrew B. Wardlaw,et al.  Fluid-structure interaction mechanisms for close-in explosions , 2000 .

[23]  T. Wierzbicki.  Petalling of plates under explosive and impact loading , 1999 .

[24]  Fabien Caleyron,et al.  Simulation numérique par la méthode SPH de fuites de fluide consécutives à la déchirure d'un réservoir sous impact , 2011 .

[25]  Carlos A. Felippa,et al.  Finite element analysis of shock-induced hull cavitation , 1984 .

[26]  Pawan Kumar,et al.  On deformation and tearing of stiffened and un-stiffened square plates subjected to underwater explosion—a numerical study , 2010 .

[27]  Zhi Zong,et al.  A numerical study of whole ship structural damage resulting from close-in underwater explosion shock , 2013 .

[28]  T. Wierzbicki,et al.  Large deformation of thin plates under localised impulsive loading , 1996 .

[29]  Furen Ming,et al.  A robust shell element in meshfree SPH method , 2013 .

[30]  R. Palmer,et al.  The deformation and shear failure of peripherally clamped centrally supported blast loaded circular plates , 2005 .

[31]  Furen Ming,et al.  Smoothed Particle Hydrodynamics for the Linear and Nonlinear Analyses of Elastoplastic Damage and Fracture of Shell , 2015 .

[32]  G. Dilts.  MOVING-LEAST-SQUARES-PARTICLE HYDRODYNAMICS-I. CONSISTENCY AND STABILITY , 1999 .

[33]  G. Nurick,et al.  The deformation and tearing of thin circular plates subjected to impulsive loads , 1990 .

[34]  T. Wierzbicki,et al.  Fracture prediction of thin plates under localized impulsive loading. Part II: discing and petalling , 2005 .

[35]  Vincent Faucher,et al.  Dynamic simulation of damage‐fracture transition in smoothed particles hydrodynamics shells , 2012 .

[36]  Yu. S. Yakovlev,et al.  Dynamic Loads in Underwater Explosion , 1973 .

[37]  M. Riley,et al.  Failure Mode Transition in Air-Backed Plates from Near Contact Underwater Explosions , 2010 .

[38]  Zhen Chen,et al.  An SPH model for multiphase flows with complex interfaces and large density differences , 2015, J. Comput. Phys..