Affiliation:
1. Korea Atomic Energy Research Institute
2. Pukyoung National University
Abstract
This study aimed to model the long-term creep curves above 105 hours by implementing a
nonlinear least square fitting (NLSF) of the Kachanov-Rabotnov (K-R) model. For this purpose, the
short-term creep curves obtained from a series of creep tests at 950oC were used. In the NLSF of their
full creep curves, the K-R model represented a poor match to the experimental curves, but the
modified K-R one revealed a good agreement to them. The Monkman-Grant (M-G) strain represented
the behavior of a stress dependency, but the parameter was constant with a stress independency. The
value in the modified K-R model was 2.78. Long-term creep curves above 105 hours from
short-term creep data were modeled by the modified K-R model.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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