Journal Published Online: 01 November 1986
Volume 14, Issue 6

Cyclic Stress and Diametral Strain Response During High Strain Amplitude Fatigue of a 1Cr-1.3Mo-0.3V Bainitic Rotor Steel at Elevated Temperature—Part II



Tests of a Cr-Mo-V rotor steel have been carried out at 550°C using continuous cycling and cycling with tensile dwells. A special feature of these tests was that they were carried out in control by the axial total strain but that diametral strain was simultaneously measured. Comparison of the diametral and axial strain ranges showed that “Poisson's ratio” initially increased but subsequently declined steadily with accumulating cycles. While these results do not challenge the traditional view of Poisson's ratio which is defined for homogeneous material, they indicate that numerical values of the ratio must be used with caution. The results on diametral strain response are carefully analyzed and defended as a true material response; they indicate that the ratio of diametral to axial strain is sensitive to the accumulated fatigue damage of the specimen in a rather unpredictable fashion.

Author Information

Rahka, KA
Technical Research Centre of Finland, Espoo, Finland
Laird, C
University of Pennsylvania, Philadelphia, PA
Pages: 15
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Stock #: JTE10344J
ISSN: 0090-3973
DOI: 10.1520/JTE10344J