Abstract
The dynamic compressive behaviors of porous copper foams are studied by means of two different split Hopkinson pressure bars (SHPB), i.e., nylon bar and aluminum alloy bar, and the two experimental methods are compared. The wave propagation coefficient method is used to revise the effects of visco-elasticity on the propagation of stress wave in the nylon bars. A piecewise four-wave method is proposed to solve the multi-loading problem in the aluminum-alloy SHPB tests. The results show that the four-wave method for aluminum bar can also give the complete and valid dynamic compressive stress-strain curves for foam materials. Compared with the method for nylon bar, it is simple and can avoid a complicated visco-elastic wave processing problem.
| Original language | English |
|---|---|
| Pages (from-to) | 151-156 |
| Number of pages | 6 |
| Journal | Binggong Xuebao/Acta Armamentarii |
| Volume | 35 |
| Publication status | Published - 1 Dec 2014 |
Keywords
- Explosion mechanics
- Foam material
- Multi-loading
- Propagation coefficient
- Split Hopkinson pressure bar
- Stress wave