BABAK KHODABANDELOO, MATTIAS ERIKSSON, ANSEL BERGHUVUD and CLAES HEDBERG
Abstract
The phenomena of nonlinear acoustic wave modulation and slow dynamics are both associated with the fracture content. A rock has inherently a high fracture level, which is why we in this paper have used a new experimental set-up to measure the dynamic response of a rock beam exposed to light and heat. A short steel support was placed in the middle underneath a rock beam. The vertical position of the rock beam's end was measured with a laser triangulation displacement sensor. The beam was exposed to either blue light or heat, and the beam end deflection was monitored during the exposure and in the recovery after the exposure stopped. The largest effect is due to the temperature gradient from the thermal expansion. Qualitative differences exist, pointing to a non-thermal potential energy storage seen for blue light, while heat energy goes to kinetic energy (i.e. temperature).
Key Words: Slow Dynamics, Rock Damage, Micro-Fractures, Material State Dynamics.
