Optimization and verification of creep equations for heat resistant steels
| Autor: | Michael Monsees, Karl Heinz Kloos, Joachim Granacher |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Heat resistant
Materials science Strain (chemistry) Subroutine Metallurgy Metals and Alloys Fracture mechanics 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Finite element method 020501 mining & metallurgy Stress (mechanics) 0205 materials engineering Creep Composite material 0210 nano-technology |
| Zdroj: | Steel Research. 69:454-462 |
| ISSN: | 0177-4832 |
| DOI: | 10.1002/srin.199805579 |
| Popis: | A direct creep curve assessment of multi-heat creep data delivers condensed creep curve bands of a steel type for a limited number of stress groups. The mean creep curves of these stress groups are the basis for an examination and if necessary optimization of a creep equation which was originally based on a time temperature parameter assessment. This procedure is demonstrated for creep equations of steel types 10 CrMo 9 10 and X 21 CrMoV 12 1. The creep equations are available in the form of a subroutine Kara FW which serves as a user subroutine for finite element programmes. The scatter band covered by such a creep equation can be described by strain factors for initial plastic strain and for creep strain. A critical strain was developed to indicate creep rupture or local crack initiation. This critical strain is the uniform elongation which appears at rupture. It can be determined by finite element analyses of the specimens tested. Further, the optimized creep equations are verified by the recalculation of different service type tests using the programme Abaqus and the subroutine Kara FW. |
| Databáze: | OpenAIRE |
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