新型包覆式双材质杆状EFP成型的数值仿真研究

Numerical simulation of new wrapping double-material rod-shaped EFP forming

为提高对近距离(4~5倍装药口径)轻型装甲的毁伤,基于PELE毁伤机理设计了一种包覆式双材质药型罩。运用ANSYS/LS-DYNA软件对大锥角变壁厚药型罩形成EFP进行数值仿真,研究药型罩锥角与装药长径比以及壁厚变化率对EFP成型的影响,对比分析其成型效果以得到较理想的侵彻体装药结构。结果表明:装药长径比是影响EFP速度的主要因素,锥角是影响EFP长径比的主要因素;药型罩锥角为149°左右、壁厚变化率为10.0%左右、装药长径比为0.8时可以形成较理想的杆状EFP,此时EFP的稳定速度约为2 598 m/s。最后通过传统单材质杆状EFP和该新型双材质杆状EFP侵彻靶板仿真,得出该新型包覆式双材质杆状EFP在侵彻靶板时能够产生类似PELE的横向效应,比单材质杆状EFP对靶板后部有更好的毁伤能力。

In order to improve the damage to light armor at close range（4-5 times charge caliber）,a kind of wrapping doublematerial liner was designed based on the damage mechanism of PELE. Using ANSYS/LS-DYNA software,the influence of the cone angle,the charge length-to-diameter ratio and the rate of liner thickness on EFP forming was studied based on the liner of large cone angle and variable-wall-thickness. The forming effect was compared and analyzed to obtain the optimal structure. The results show that charge length-to-diameter ratio is the main factor influencing the EFP velocity,cone angle is the main factor influencing the EFP length-to-diameter ratio. The shape of the EFP is preferable when the cone angle is about 149°,the charge length-to-diameter ratio is 0.8,the rate of liner thickness is about 10.0%,and the EFP steady speed is 2 598 m/s. Finally,the simulation on traditional single-material rod-shaped EFP and the new double-material rod-shaped EFP penetrating target was carried out. It is concluded that the new EFP can produce a lateral efficiency similar to PELE when penetrating target,which has greater damage ability to target than the single-material rod-shaped EFP.