Investigation On The Resistance Performance Of Aluminum Target Against Yaw And Oblique Impact

The impact between projectile and target has been becoming extensively adopted in civil aviation safety industry,and the research about the resistance ability of target against projectile manifests remarkable engineer value.Unfortunately,most studies at home and abroad focus on the normal impact,whereas the effect of oblique and yaw angle of projectile on the performance of target has not been analyzed systematically.Therefore the monolithic 2A12 thin aluminum alloy target are selected as subject to investigate the resistance of target against hard blunt-nosed projectile under yaw and oblique impacting in this paper,also each factor that may has influence on the penetration ability of projectile has been analyzed.Major work includes the following parts:Firstly,some researches about yaw and oblique impacting at home and abroad were briefly introduced.Analysis based on these researches appears that the initial posture of projectile indeed has significant influence on the penetration property of projectile and the damage condition of target.However,discussions about oblique impacting as well as yaw impacting are urgently need to be supplied and improved when comparing with normal impacting.In reaction to this problem,the research thinking in this paper is presented;Secondly,the simulation model of target impacted by projectile was established with the help of finite software ABAQUS,also the experiment of normal impacting was conducted by one-stage gas gun.Comparing ballistic limit?residual velocity and damage condition between experiment and simulation,the numerical ballistic limit was merely 3.42% lower than that in experiment,also the damage condition agreed with each other,thus the effectiveness of simulation model was validated;Moreover,the resistance property of target under oblique and yaw impacting were discussed separately,also the empirical formulas to quantitatively depict the regulation was established.Analysis based on the ballistic limit illustrates that with the increase of initial oblique or yaw angle,the ballistic limit trends to decrease and then increase,when the initial oblique angle or initial yaw angle ranged from 15° to 30°,the ballistic limit tended to minimal value.After then the failure mode of target and the motion stability of projectile was studied to give the reasonable explanation of changing regularity of ballistic limit;Finally,the resistance property of target under the combination of oblique and yaw impacting was investigated,numerical results depicted that the resistance performance of target was significantly influenced by initial gesture and initial velocity of projectile,and the ballistic limit of target was firmly effected by initial trajectory angle of projectile,the ballistic tended to minimal value when the initial trajectory angle was-20°,however it tended to maximum when the initial trajectory angle became 0°,after then the failure mode of target and the motion stability of projectile were analyzed to construe the changing regularity of target and projectile under the combination of oblique and yaw impacting.In this paper,the resistance performance of aluminum alloy target under different impacting conditions was systematically investigated,furthermore the effects of various factors on the impact results were studied.The conclusions in this paper provide some references and data to optimize the configuration and improve the resistance ability of target.