SYMPOSIA PAPER Published: 01 January 1996

Thermal Fatigue Behavior of a SUS304 Pipe Under Longitudinal Cyclic Movement of Axial Temperature Distribution


In a structural thermal fatigue test which imposed an oscillating axial temperature distribution on a SUS 304 pipe specimen, different crack initiation lives were observed between the inner and the outer surfaces, although the values of the von-Mises equivalent strain range calculated by FEM inelastic analysis were almost the same for both surfaces. The outer surface condition was an in-phase thermal cycle and an almost uniaxial cyclic stress (low hydrostatic stress). The inner surface condition was an out-of-phase thermal cycle and an almost equibiaxial cyclic stress (high hydrostatic stress). A uniaxial thermal fatigue test was performed under the simulated conditions of the outer and inner surfaces of the pipe specimen. The in-phase uniaxial thermal fatigue test result was in good agreement with the test result of the pipe specimen for the outer surface. The out-of-phase uniaxial thermal fatigue test which simulated the inner surface condition, showed a longer life than the in-phase uniaxial test, and thus contradicted the result of the structural model test. However, the structural model test life for the inner surface agreed well with the uniaxial experimental measurement when the strain range of the inner surface was corrected by a triaxiality factor.

Author Information

Yamauchi, M
Nagasaki R&D Center, Mitsubishi Heavy Industries, Ltd., Nagasaki, JAPAN
Ohtani, T
Kobe Shipyard and Machinery Works, Mitsubishi Heavy Industries, Ltd., Kobe, JAPAN
Takahashi, Y
Central Research Institute of Electric Power Industry, Tokyo, JAPAN
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Developed by Committee: E08
Pages: 117–129
DOI: 10.1520/STP16450S
ISBN-EB: 978-0-8031-5325-7
ISBN-13: 978-0-8031-2001-3