Dynamic Analysis of Helium Bubble Growth in the Pure Al under High Strain-Rate Loading
-
摘要: 分析了高应变率加载下纯铝中氦泡长大的动力学过程,给出了含内压氦泡长大的动力学方程,并且分别研究了氦泡内压、基体材料惯性、粘性、表面张力以及基体环境温度对初始半径为1 nm氦泡长大的影响。研究结果表明:(1)初始内压可以促使氦泡快速长大,当氦泡直径超过1 m时,内压对氦泡长大的影响可以忽略不计。(2)表面张力在氦泡整个长大过程中的影响都很小。(3)材料惯性对氦泡长大起抑制作用,并且随着氦泡半径的增长,抑制效应越来越明显。(4)在所有因素中,温度对氦泡长大的影响最为明显,温度升高,材料的粘性降低,氦泡的内压增加,促使氦泡加速长大。Abstract: Based on the dynamic process of helium bubble growth under high strain-rate, the dynamic equation of helium bubble growth has been presented. The effects of internal pressure of helium bubble, inertia, viscosity, surface tension of base material and environment temperature on helium bubble with 1 nm radius have been considered respectively. Results indicate that: (1) At high strain-rate loading, the original internal pressure may help to accelerate the growth of the helium bubble. When the radius of helium bubble is larger than 1 m, the internal pressure is too small and it may be omitted. (2) The effect of surface tension is very weak in the whole process of helium bubble growth. (3) The growth of helium bubble may be restrained by the inertia. And this effect will be more obvious with the growth of diameter. (4) While all the above effects are important, the effect of temperature needs to be particularly emphasized. With the temperature rising, the viscosity will decrease and the internal pressure will increase, the growth of helium bubble will be accelerated.
-
Key words:
- high strain-rate /
- helium bubble /
- internal pressure /
- inertia /
- viscosity
-
Carroll M M, Holt A C. Static and Dynamic Porecollapse Relations for Ductile Porous Media [J]. J Appl Phys, 1972, 43: 1626-1636. Johnson J N. Dynamic Fracture and Spallation in Ductile Solids [J]. J Appl Phys, 1981, 52(4): 2812-2825. Wang Z P. Growth of Voids in Porous Ductile Materials at High Strain Rate [J]. J Appl Phys, 1994, 76(3): 1535-1542. Zhang F G, Cui Y P, Qin C S, at el. Nucleation and Growth of Voids in Ductile Materials under High Pressure Dynamic Loading [J]. Acta Armamentarii, 2004, 25(6): 730-733. (in Chinese) 张风国, 崔亚平, 秦承森, 等. 动载荷作用下延性材料的孔洞增长和成核 [J]. 兵工学报, 2004, 25(6): 730-733. Zhou H Q, Sun J S, Wang S Y. The Growth of Microvoids in Ductile Materials under Dynamic Loading [J]. Explosion and Shock Waves, 2003, 23(5): 415-419. (in Chinese) 周洪强, 孙锦山, 王书元. 动载荷下延性材料中微孔洞的增长模型 [J]. 爆炸与冲击, 2003, 23(5): 415-419. Poritsky H. The Collapse or Growth of a Spherical Bubble or Cavity in a Viscous Fluid [A]. Cloutier L, Rancourt D. Proc of the First U S National Congress of Applied Mechanics [C]. New York: ASME, 1952: 813-815. Seaman L, Curran D R. Inertia and Temperature Effects in Void Growth [A]. Furnish M D, Thadhani N N, Horie Y. Shock Compression of Condensed Matter-2001 [C]. New York: American Institute of Physics, 2002: 607-610. Lensky N G, Navon O, Lyakhovsky V. Bubble Growth during Decompression of Magma: Experimental and Theoretical Investigation [J]. Journal of Volcanology and Geothermal Research, 2004, 129: 7-22. Donnelly S E. The Density and Pressure of Helium in Bubbles in Implanted Metals [J]. A Critical Review, Radiation effects, 1985, 90: 1-47. Seaman L, Curran D R, Shockey D A. Computational Models for Ductile and Brittle Fracture [J]. J Appl Phys, 1976, 47(11): 4814-4826. Carroll M M, Kim K T. The Effect of Temperature on Viscoplastic Pore Collapse [J]. J Appl Phys, 1986, 59(6): 1962-1964. Curran D R, Seaman L. Dynamic Failure of Solids [J]. Physics Reports, 1987, 147 (56): 303-313.
点击查看大图
计量
- 文章访问数: 7766
- HTML全文浏览量: 380
- PDF下载量: 693