Inertia and temperature effects in void growth
Abstract
When a void grows in a viscous material, the void growth rate (above a critical void size) depends on the inertia of the material, not just on the viscosity. As the voids rapidly expand during high-rate fracture, the material becomes hot and its strength and viscosity may both reduce because of this heating. We performed numerical simulations to study the growth of a single void and used an extended version of our ductile fracture model DFRACT [Ref 1] to study the growth of void size distributions. Inertial effects cause the void size distributions (number vs radius) for aluminum and copper to be concave downward in a semi-log plot. This effect is compared with the effects of a simple coalescence model exhibiting a tendency toward upward concavity of these distributions. The importance of the thermal effects depends on the assumed form of the thermal strength reduction effect on the coefficient of viscosity and the yield strength. 1. D. R. Curran, L. Seaman, and D. A. Shockey, Physics Reports, Vol. 147, Nos. 5 & 6, March, 1987, pp 254-388.
- Publication:
-
APS Shock Compression of Condensed Matter Meeting Abstracts
- Pub Date:
- June 2001
- Bibcode:
- 2001APS..SHK.L1002S