SYMPOSIA PAPER Published: 01 January 1976

Instability Effects in Thermal Fatigue


This paper considers shape changes which develop progressively in hourglass specimens subjected to fully reversed cyclic plastic strain applied in a variety of mechanical and thermal waveforms. While the strain at the minimum diameter is controlled, off-center locations subjected to cyclic plastic strain undergo ratcheting. Two major off-center shape changes have been observed: barreling and necking. The paper discusses the reasons for these changes.

Author Information

Coffin, LF
Corporate Research and Development, General Electric Co., Schenectady, N.Y.
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Developed by Committee: E08
Pages: 227–238
DOI: 10.1520/STP27894S
ISBN-EB: 978-0-8031-4685-3
ISBN-13: 978-0-8031-0586-7