Numerical Simulation for Formed Projectile of Depleted Uranium Alloy
-
摘要: 利用SPH(Smooth Particle Hydrodynamic)算法对贫铀合金材料自锻弹丸过程进行了数值模拟。其中使用了人造爆轰压力,即给定了爆轰压力的时间分布与空间分布。为了描述材料在高压作用下的变形性能,材料模型采用了Johnson-Cook关系。通过数值计算,给出了自锻弹丸的飞行速度、弹丸几何尺寸及炸高等参数。Abstract: The numerical simulation for forming projectile of depleted uranium alloy with the SPH (Smooth Particle Hydrodynamic) algorithm was presented. In the computations the artificial pressures of detonation were used, i. e. the spatial distribution and time distribution were given artificially. To describe the deformed behaviors of the depleted uranium alloy under high pressure and high strain rate, the Johnson-Cook model of materials was introduced. From the numerical simulation the formed projectile velocity, projectile geometry and the minimum of the height of detonation are obtained.
-
Key words:
- formed projectile /
- detonation /
- SPH algorithm /
- artificial pressure
-
[1] Flis W J.Fully automatic rezoning for a finite element hydrocode in 2-D and 3-D[A].In:Michael J Murphy,Joseph E Backofen Eds.17th Internat Symposium on Ballistics[C].Midrand: South Africa,1998,2,465-472. [2] Lucy L B.A numerical approach to the testing of the fission hypothesis [J].Astron J,1977,88(10):1013-1024. [3] Gingold R A,Monaghan J J.Smoothed particle hydrodynamics: theory and application to non-spherical stars[J].Monthly Notices R Astron Soc, 1977,181(4):375-389. [4] Libersky L D,Petschek A G.Smoothed particle hydrodynamics with strength of materials[J].Lecture Notes in Physics,1990,395(3):248-257. [5] Johnson G R,Cook W H.Fracture characteristic of three metals subjected to various strain rate, temperatures and pressures[J].Engineering Fracture Mechanics,1985,21(1):31-48. [6] von Neumann J,Richtmeyer R D.A Method for the numerical calculation of hydrodynamic shocks[J].J Appl Phys,1950,21:232-237. [7] Gingold R A,Monaghan J J.Shock simulation by the particle method SPH[J].J Comput Phys,1983,52(4):374-389. [8] Johnson G R,Cook W H.A Constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[A].In: Michael J Murphy,Joseph E Backofen Eds.7th Internat Symposium on Ballistics[C].Hague:Netherlands,1983,541-547
计量
- 文章访问数: 2246
- HTML全文浏览量: 121
- PDF下载量: 564
- 被引次数: 0