SYMPOSIA PAPER Published: 01 January 1988
STP24501S

Application of the Overstress Concept for Creep-Fatigue Evaluation

Source

Type 304 stainless steel was subjected to a controlled push-pull strain with a wide variety of waveforms at 650°C in 0.1 μPa vacuum. No indication of oxidation was observed in the specimens. The frequency effect on creep-fatigue behavior was diminished, but the tensile hold time and waveshape effects were still observed in this high vacuum environment. It was concluded that a reduction of fatigue life due to creep-fatigue interaction is observed when a tension going time exceeds a compression going time. A back stress was determined from the data, and an overstress was defined as the difference between an applied stress and a back stress. The overstress was related to the inelastic strain rate. It is shown that overstress can be reasonably used to describe the creep-fatigue damages for life prediction.

Author Information

Morishita, M
Oh-arai Engineering Center, Ibaragi, Japan
Taguchi, K
Toshiba Corporation, Nuclear Engineering Laboratories, Kawasaki, Japan
Asayama, T
University of Tokyo, Tokyo, Japan
Ishikawa, A
University of Tokyo, Tokyo, Japan
Asada, Y
University of Tokyo, Tokyo, Japan
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Details
Developed by Committee: E08
Pages: 487–499
DOI: 10.1520/STP24501S
ISBN-EB: 978-0-8031-5035-5
ISBN-13: 978-0-8031-0944-5