EVALUATION OF A HYDROCODE IN MODELLING NATO THREATS AGAINST STEEL ARMOUR
Material responses to ballistic threats are treated in light of the modified Johnson-Cook high strain rate constitutive equation and the Cockcroft-LathaM single parameter fracture criterion. The varied threats are deduced from NATO Standard 4569 used to define personnel protection in light armoured vehicles. The perforation failure of the ARMOX 560t steel by 7.62mm AP round is numerically evaluated through a 3D axis-symmetric model using the commercial hydrocode: LS-DYNA. Discussion of the Lagrangian based FEA is shown for the fullyintegrated and under-integrated solid elements. This improved methodology for simulating ballistic impact captures the major physical attributes whilst improving the computational time. Resultant residual velocity comparisons are made between the simulation and the published literature and were found to be generally good for the defined threat. Residual velocities between the ballistic limit and the NATo Standard of 920m/s are shown to be volatile, with the diminishing strain rate sensitivity giving way to a more pronounced thermal softening regime with a corresponding increase in residual velocity.. A second NATO defined threat, appearing in Stanag 4569, is shown for the interaction of blast waves with solid structures. The effect on an ElastoPlastic Lagrangian solid is evaluated for blast waves using the CONWEP and the ALE blast models. ALe simulation is evaluated for the near blast scenario with FSI (Fluid Structure Interaction) coupling used to compute the resultant pressure and displacement of the solid plate. The hope of this study is to analyse the added improvements ALE formulation brings to the analysis of blasts as opposed to the CONWEP blast code.
Michael Saleh Lyndon Edwards
Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation (ANSTO).L Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation (ANSTO) L
国际会议
25th International Symposium on Ballistics(第25届国际弹道会议)
北京
英文
1391-1401
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）