The strain rate and temperature dependence of Young's modulus of ice

Measurements were made of Young's modulus of polycrystalline ice over the strain rate range of 10[-8] to 5 x 10[-3] s[-1] at temperatures of -10, -19.3, -29 and -39.5 degrees C on two types of ice: naturally formed granular ice and laboratory grown columnar-grained ice. Load was applied at constant rate of cross-head movement until the stress was about 5 kg/cm[2], and then removed immediately at the same rate. Young's moduli were determined from the linear portion of the stress-strain curve during loading. The modulus for both types of ice increased with increasing strain rate over the full range of strain rate covered in the investigation.Les auteurs mesurent le module de Young de la glace polycristalline \ue0 des viteses de d\ue9formation entre 10[-8] et 5 x 10[-3] s[-1] et \ue0 des temp\ue9ratures de -10, -19.3, -29 et -39.5 degr\ue9s C pour deux genres de glace: la glace granulaire naturelle et la glace colonnaire obtenue en laboratoire. La charge est appliqu\ue9e \ue0 une vitesse de traverse constante jusqu'\ue0 une contrainte d'environ 5 kg/cm[ 2], puis enlev\ue9e imm\ue9diatement \ue0 la m\ueame vitesse. On d\ue9 termine le module de Young d'apr\ue8s la partie lin\ue9aire de la courbe contrainte/d\ue9formation durant le chargement. Le module des deux genres de glace augmente en m\ueame temps que la vitesse de d\ue9formation augmente \ue0 toutes les vitesses de d\ue9formation \ue9tudi\ue9es.Peer reviewed: NoNRC publication: Ye