Destroy Probability of Ship Defensive Structure Subjected to UnderwaterContact Explosions

摘要

The reliability of ship defensive structure subjected to underwater contact explosions isimportant both in theory and engineering.Because of the complex response of structure underexplosions in which the fluid-structure-interaction should be considered,the problem underdiscussion could not be solved by analytical method.The Monte Carlo combined with FEM methodis used to solve this problem in this paper.The samples of basic random variables that are dynamitedensity,the elastic modulus and ultimate strength of plate material are generated by the randomnumber generate program.Then,with these samples,the simulations of multilayer plate-shellstructure subjected to underwater contact explosions are done by LS-DYNA,and the maximumstress of each plate is obtained,which should be validated to obey the normal distribution.Based onthe intensity rule,the destroy index is introduced in this paper,then the destroy probability of eachplate and system are calculated using the basic theory of reliability.