Modeling of creep deformations in ice
Conference
·
OSTI ID:398054
- Norsk Hydro a.s., Bergen (Norway)
- NORUT Teknologi A.S., Narvik (Norway)
For an accurate analysis of the forces during ice-structure interaction it is necessary to use a correct material model for the ice. An elasto-viscoplastic constitutive material model is able to describe elastic, plastic and viscous deformations, which all are present during ice-structure interaction. The creep behavior of the material model is usually assumed to be purely viscous (i.e. secondary creep) and governed by Glen`s law. Neglecting primary creep will lead to an underestimation of creep strains in the initial stages of the deformation process. How this affects the indentation force is not known. In the present study, both primary and secondary creep deformations are considered. Different mathematical models for creep deformations in ice are investigated. These models are adopted in analysis of ice indentation problems using the finite element method. The numerical results show that the effect on the maximum indentation force of including primary creep in the material description is negligible, whereas the effect on the creep process itself is large.
- OSTI ID:
- 398054
- Report Number(s):
- CONF-940409--; ISBN 1-880653-10-9
- Country of Publication:
- United States
- Language:
- English
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