药型罩材料性能参数对双模毁伤元成型的影响

摘要

针对不同药型罩材料在多模战斗部中的应用问题,研究了药型罩材料性能参数对双模毁伤元爆炸成型弹丸(EFP)和聚能杆式侵彻体(JPC)成型的影响.基于Johnson-Cook本构模型,采用单一变量法改变材料参数取值,应用ANSYS/LS-DYNA软件仿真计算了材料特征参数对双模毁伤元成型的影响.对铝、铁、铜三种药型罩材料的毁伤元成型进行了X射线成像验证试验.结果表明,双模毁伤元EFP和JPC的头部速度和长径比随准静态下的屈服应力、应变硬化系数、应变率相关系数、温度相关系数、应变硬化指数取值的增加均呈指数递减.密度对双模毁伤元EFP和JPC头部速度影响最大.屈服应力、硬化系数对EFP毁伤元长径比影响最大.拟合获得了考虑材料性能影响的双模毁伤元头部速度及长径比计算公式.铝、铁、铜三种材料形成的双模毁伤元EFP和JPC的头部速度和长径比的计算结果与试验结果误差小于10％,显示二者结果吻合较好.%Aiming at the application problem of different liner materials in the multimode warhead,the effects of performance parameters of the liner materials on the forming of dual mode damage elements,explosively formed penetrator (EFP) and jetting projectile charge (JPC) were studied.Based on the Johnson-Cook's constitutive model,the single variable method was used to change the material parameter values.The influence of material characteristic parameters on the forming of dual mode damage elements was simulated and calculated by ANSYS/LS-DYNA software.X-ray imaging verification test of three kinds of liner materials,aluminum,iron and copper was performed.Results show that the tip velocity and length-diameter ratio of dual mode damage elements,EFP and JPC,are exponentially decreasing with the increase of yield stress,strain hardening coefficient,strain hardening exponent,temperature correlation coefficient and strain hardening exponent under quasi-state.The density has the greatest influence on the tip velocity of the EFP and JPC,and the yield stress and the hardening coefficient have the greatest influence on the length-diameter ratio of the EFP.The formula calculating the tip velocity and length-diameter ratio of the dual mode damage elements considering the influence of material properties were presented by fitting.The error between calculated results and experimental ones for tip velocity and length-diameter ratio of the dual mode damage elements,EFP and JPC formed by three kinds of liner materials,aluminum,iron and copper is less than 10％,revealing that the two results are in good agreement.