Within An Explosion Similar To The Study Of The Theory And Size Effect

For studying the damage situation of the inernal structure when an explosion taking place and revealing the efficent damage mechanism.an experiment should be carryed out. But it is always so costly or difficult to do a original scale model experiment.so,a subscale model experiment can replace.And it is important to know how to establish the model and how to deal with the experiment result.These can be resolved by similarity theory and size effect about internal explosion.In this paper,a brief analysic about internal explosion is done fistly.Then a dimensional analysis about blast damage parameters is done according to simialrity theory.And then LS-DYNA soft is used to simulate the process of internal explosion and shock wave pressure distribution of structural wall is studyed.Lastly,subscale simulation about internal explosive is done and how to change of pressure when structure size changed.The results of dimensional analysis show that peak pressure of shock wave and ratio of impulse to explosive weight'three root don't change if the explosive type,structure'shape and ratio of explosive size to structure size don't change.The results of numerical simulation also show that blast damage parameters is not affected by size effect if subscale coefficient is not less than 0.1.