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Crack-enhanced creep in polycrystalline material: strain- rate sensitive strength and deformation of ice

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Research in Construction
FormatText, Article
Subjectice; microfissures; creep; non-linear viscoelastic creep equation; polycrystalline material; cracking; microcracks prediction; high temperature grain boundary embrittlement process; crack-enhanced creep; material response; constant strain-rate loading conditions; theoretical - experimental comparisons; microfissure; fluage
Abstract
A non-linear viscoelastic creep equation for polycrystalline material is presented. It incorporates the effect of cracking and is capable of describing primary, secondary and tertiary behaviour. The model predicts the formation of microcracks and thus the damage state due to the high temperature grain-boundary embrittlement process. This paper describes its application in formulating crack- enhanced creep and material response under constant strain- rate loading conditions (theoretically the simplest case but actually the most difficult to maintain). The formulation makes it possible to define the rate effect on stress-strain response and the rate sensitivity of strength, failure time, failure strain, damage and damage rate, strain recovery, etc. Numerical correspondence between theory and experiment was observed when predictions were compared with availible closed-loop, controlled, constant strain-rate strength and deformation data on pure ice. Calculations made use of material constants determined from independent constant-load creep tests.
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  • Journal of Materials Science 23, no. 12 (1988): 4415–4428.
LanguageEnglish
Peer reviewedYes
IdentifierIRC-P-1581
NRC numberNRCC 30146
NRC-IRC-2201
NPARC number20374041
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Record identifier5a084a6d-559d-4073-ba8d-6503ee63eafc
Record created2012-07-23
Record modified2020-06-06
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