ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 5

Crack Initiation and Total Fatigue Life of a Carbon Steel in Vacuum and Air

Kujawski, D
Senior research associate and professor, University of Alberta, Edmonton, Alberta

Ellyin, F
Senior research associate and professor, University of Alberta, Edmonton, Alberta

(Received 30 April 1991; accepted 30 March 1992)

Abstract

Fully-reversed strain-controlled test results of a carbon steel (ASTM A 516 Gr. 70) in an ambient atmosphere and in a vacuum of 0.1 mPa are compared. Vacuum data may be viewed as representing a “pure” (mechanical) fatigue damage. In the case of an air environment, the rate of fatigue damage accumulation increases due to the environmental contribution.

The test results are described in terms of the crack initiation and total lives. The crack initiation data are fairly well-correlated with the plastic strain energy per cycle. The significance of the environment condition on the life prediction procedures is discussed.

Keywords:
crack initiation, total fatigue life, air and vacuum, room temperature, strain-controlled fatigue test, plastic strain energy

Paper ID: JTE11929J
DOI: 10.1520/JTE11929J
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