Dynamic Analysis of Helium Bubble Growth in the Pure Al under High Strain-Rate Loading

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.