Role of transient creep in high temperature tensile failure of ice

The stress-strain relationship to fracture for polycrystalline ice in tension has been shown to be governed by elastic and delayed elastic deformation with negligible viscous flow. Delayed elasticity, associated with grain boundary sliding, dominates the deformation process as the grain size decreases leading to an apparent transition from brittle to ductile with the decrease in grain size.La relation contrainte-d\ue9formation jusqu'\ue0 rupture de la glace polycristalline en tension s'est r\ue9v\ue9l\ue9e de nature \ue9lastique instantan\ue9e et \ue9lastique diff\ue9r\ue9e avec \ue9coulement visqueux n\ue9gligeable. La d\ue9formation \ue9lastique diff\ue9r\ue9e associ\ue9e au glissement des grains les uns sur les autres est pr\ue9pond\ue9rante lorsque la taille des grains diminue, conduisant \ue0 une p\ue9riode transitoire apparente de l'\ue9tat fragile \ue0 l'\ue9tat ductile.Peer reviewed: YesNRC publication: Ye