Abstract
The viscoelastic behaviour of certain American coals was investigated by thermomechanical and thermogravimetric analysis. Thin coal sections were tested in creep under continuous stress ranging from 0.158 to 0.790 M Pa during heating from 35 to 350 °C at l0 K min −1. Additional samples were tested in creep at constant temperature and stress, and also under cyclic stressing. The results show that the compressive strain of coals is a function of the temperature, carbon content and number of creep-recovery cycles. It is concluded that the mechanical (viscoelastic) behaviour is time-dependent (at constant temperature) and that it is related to the glassy-rubbery transition temperature and the subsequent network degradation at temperatures significantly higher than T g .
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