Comparative study of ice strength data

A review of strain rate sensitivity of uniaxial compressive yield strength of polycrystalline ice indicates that the results obtained by different investigators reflect the stiffness of the corresponding test systems. It is shown that the softer the system the softer is the effective response of the material. Using the concept of failure modulus, it is shown that brittle-like splitting failures do not indicate pure elastic loading conditions, and that apparent ductile-to-brittle transition depends on the response of the test system. Thus, much of the scatter in available results for the same type of ice is attributable to differences in the response of the different test systems.Une \ue9tude de la sensibilit\ue9 \ue0 la d\ue9formation caract\ue9risant la limite conventionnelle de proportionnalit\ue9 lors d'un essai de compression uniaxiale, effectu\ue9 sur de la glace polycristalline, a indiqu\ue9 que les r\ue9sultats obtenus par divers chercheurs refl\ue8tent la rigidit\ue9 des syst\ue8mes exp\ue9rimentaux correspondants. On d\ue9montre que plus le syst\ue8me est souple, plus la r\ue9ponse effective du mat\ue9riau est souple. En utilisant la notion de module de rupture, on d\ue9montre que des ruptures par fendage, de type fragile, n' indiquent pas des conditions de charge pure \ue9lastique, et que la transition apparente ductilit\ue9-fragilit\ue9 d\ue9pend de la r\ue9ponse du syst\ue8me exp\ue9rimental. En grand partie, la dispersion des r\ue9sultats obtenus pour ce m\ueame type de glace est donc attribuable \ue0 des diff\ue9rences dans la r\ue9ponse des divers syst\ue8mes exp\ue9rimentaux.Peer reviewed: YesNRC publication: Ye