Research On Penetration-induced Blast Effect And Damage Mechanism Of Reactive Material Fragment

Fluoropolymer based reactive material is one of the most important fields of high efficiency damage,which is concerned by weapons development institutions all over the world because of the unordinary performance and wild application prospect.The research production has great value for developing high efficiency damage technology and military application.The damage mechanisms caused by reactive fragment penetrating target plate and deflagrate behind target plate have been researched by theoretical analyses,numerical simulations and experiments.The research works are as follow:(1)Mechanical properties and failure behavior of reactive material have been discussed.The reagent combination and preparation method of reactive material are determined based on the damage mechanism and technology demands.After that,the test for mechanical properties and failure behavior of reactive material is performed.The test results and material microstructure are used to analysis the force chains and failure mechanics.(2)The impact initiation and mechanical model has been researched.Ballistic experiment is used to investigate the reactive material characteristics of impact initiation,and analysis the influence factor of impact initiation,such as target thickness and impact velocity.The mechanical model of reactive fragment penetrate target is suggested by combining theory of stress waves and Rankine-Hugoniot relations.The influence factors for the maximum stress in reactive material and minimum thickness for completely fragmentation has been discussed,such as the material and thickness of target plate,impact velocity.(3)The fragmentation behavior of reactive material collision has been analyzed based on theory of stress waves.The fragmentation model for reactive material has been suggested,which is used for discussing the influence factors for average debris size and debris cloud distribution,such as material and thickness of target and impact velocity.(4)The ballistic limit and characteristics of energy release have been researched by ballistic gun experiment.The predictive empirical formula for ballistic limit velocity of reactive material against aluminum target and the model of energy release characteristics are suggested.(5)The ignition enhanced effect,mechanics and main mechanism of reactive material against fuel are analyzed and determined by combining ballistic gun experiments results,numerical simulations and hydrodynamic theory.The ignition ability of reactive material is better than inert metal.(6)The detonation enhanced effect,mechanics and main mechanism of reactive material against covered explosive are analyzed and determined by combining ballistic gun experiments results,numerical simulations and shock initiation theory.The detonation ability of reactive material is better than inert metal.(7)The damage effects of reactive material against metal structure target are researched by performing numerical simulations and ballistic experiments.The influences of fragment parameters,material and thickness of target,impact velocity to damage effects are determined based on the results of simulations and experiments.The relations of stress concentration,deformation,and pressure of target during penetration are analyzed based on fracture failure mechanism.By introducing constant entropy expansion theory of reactive material,the perforationequivalent diameter can be predicted,which is in accordance with the experiments results.