SYMPOSIA PAPER Published: 01 January 1993

Propagation Behavior of Small Cracks in 304 Stainless Steel Under Biaxial Low-Cycle Fatigue at Elevated Temperature


To investigate the initiation and propagation behavior of small cracks and the relationship between crack propagation and fatigue life, strain-controlled in-phase and 90° out-of-phase axial-torsional fatigue tests were conducted at 550°C, using tubular specimens of 304 stainless steel with and without surface notches. Each test was interrupted at frequent intervals to make a film replica of the outer surface of the specimen for examination with an optical microscope. Most of the fatigue life was spent in the propagation of small cracks less than 2 mm long. Regardless of loading conditions, the crack propagation rate correlated well with the equivalent shear strain range defined as a function of shear strain range and normal strain range on the plane of maximum shear strain range. The biaxial low-cycle fatigue life could be estimated from the relationship between the crack propagation rate and the equivalent shear strain range.

Author Information

Ogata, T
Central Research Institute of Electric Power Industry, Tokyo, Japan
Nitta, A
Central Research Institute of Electric Power Industry, Tokyo, Japan
Blass, JJ
Oak Ridge National Laboratory, Oak Ridge, TN
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Developed by Committee: E08
Pages: 313–325
DOI: 10.1520/STP24809S
ISBN-EB: 978-0-8031-5243-4
ISBN-13: 978-0-8031-1862-1