| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-581 - C5-585 | |
| DOI | https://doi.org/10.1051/jphyscol:1981589 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-581-C5-585
DOI: 10.1051/jphyscol:1981589
Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaften Stuttgart, F.R.G.
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-581-C5-585
DOI: 10.1051/jphyscol:1981589
INTERNAL FRICTION IN COAL
C.A. Wert et M. WellerMax-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaften Stuttgart, F.R.G.
Abstract
We have measured the internal friction of a rod of bituminous coal at a frequency near 1 Hz. Three damping peaks are observed over the temperature range 20 to 400 K. They are similar to the damping peaks observed in many polymers. One peak is thought to be caused by reorientation under stress of short segments of the -C-C-C- backbone. Another may be caused by reorientation under stress of appended radicals, perhaps O-H. Another may be caused by configurational changes in the region of the glassrubber transition of the amorphous material.