The Effect Of The Properties Of The Hood Material On The Formation Of The Double-mode Damage Element

Aimed at the problem of line’s material properties for dual mode warhead,studied the influencing law of material properties for the forming of dual mode warhead which used SHPB material dynamic performance test,LS-DYNA finite element numerical simulation and X-light imaging experiment.Firstly,conducted the Hopkinson experiment of Aluminum,Iron,Copper and Tantalum,compared and studied the stress and strain curve of these four materials in different strain rate.The parameters were fitted based on Johnson-Cook constitutive equation and acquired their constitutive equation.Secondly,the simulating model of multi-mode warhead was built up,calculated the moldig process of dual mode warhead theoretically and emulationally,researched the law of material properties for dual mode warhead using single variable method to change the material parameter.The formulas considered material’s properties were acquired which to calculate the head speed and length-diameter ratios by data fitting,the error between the calculating results with simulating results is small and controlled in 10%.Last,conducted the structural design and optimization for dual mode warhead,a set of parameters of tantalum’s liner that have a better molding were determined by orthogonal design.Conduct the X-ray imaging of dual-mode warhead and penetration test,verified the theoretical and simulating results.For the liner of AL,Fe,Cu and Ta,compared and analyzed the formation of dual mode warhead and circumstances of penetrating target,the EFP’s penetration depth of tantalum improved 55.4%compared to copper,the penetration depth of JPC are basically the same,the feasibility of using tantalum as dial-mode warhead is proved.