SYMPOSIA PAPER Published: 01 January 1988
STP24494S

Comparison of Creep-Fatigue Life Prediction by Life Fraction Rule and Strainrange Partitioning Methods

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A comparison of two kinds of creep-fatigue life prediction methods, Life Fraction Rule and Strainrange Partitioning, was performed for the cases of creep-fatigue tests under uniaxial strain-controlled conditions at 500 to 600°C in air, using a normalized and tempered 2 1/4Cr-1Mo steel. The main focus was on the influence of stress-strain behavior on life prediction. Two kinds of stress-strain values (i.e., experimental values and calculated values by inelastic analysis) were used for the life prediction of creep-fatigue tests. The results show that life prediction by the Life Fraction Rule was very sensitive to the stress-strain values, indicating a large discrepancy between predicted and observed lives in some cases, and that life prediction by the Strainrange Partitioning method was not so sensitive to the stress-strain values, indicating a good agreement between predicted and observed lives in all cases.

Author Information

Yamauchi, M
Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki, Japan
Igari, T
Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki, Japan
Setoguchi, K
Mitsubishi Heavy Industries, Ltd., Nagasaki Research and Development Center, Nagasaki, Japan
Yamanouchi, H
Choryo Engineering Company, Ltd., Nagasaki, Japan
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Details
Developed by Committee: E08
Pages: 399–413
DOI: 10.1520/STP24494S
ISBN-EB: 978-0-8031-5035-5
ISBN-13: 978-0-8031-0944-5