Creep Crack Growth Simulations By A Modified Damage Model

Researchers have proven that both environmental effects and the formation of defects such as cavities due to plastic flow and creep control the high temperature fracture behavior of nickel base superalloys under quasi-static load. Creep crack growth experiments are well suited to investigate these e...

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Bibliographic Details
Published in:WIT Transactions on Engineering Sciences 2004-01, Vol.47
Main Authors: Götting, M, Rösler, J, D. Del Genovese
Format: Article
Language:English
Subjects:
Computer simulation
Crack propagation
Crack tips
Creep (materials)
Damage
Damage assessment
Environmental effects
High temperature
Nickel base alloys
Plastic flow
Static loads
Stress propagation
Superalloys
Waspaloy
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Summary:Researchers have proven that both environmental effects and the formation of defects such as cavities due to plastic flow and creep control the high temperature fracture behavior of nickel base superalloys under quasi-static load. Creep crack growth experiments are well suited to investigate these effects. Modeling of such tests can help to better understand the occurring mechanisms. Waspaloy is an example for a material with numerous cavities ahead of the crack tip after creep crack growth testing at 973 K. In this case, the model must be able to combine damage caused by plastic and viscoplastic flow. The complicated stress state caused by the geometry, the crack propagation and the material’s behavior require the use of FEM to predict creep crack growth. Thus, several modifications to the classic damage models become nec
ISSN:1746-4471
1743-3533
DOI:10.2495/DF040031