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Near Threshold Fatigue Crack Growth Behavior in Stainless Steel |
YU Huichen;ZHANG Yanji; SUN Yanguo; XIE Shishu; TANAKA Keisuke |
Beijing Institute of Aeronautical Materials; Beijing 100095 |
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Cite this article:
YU Huichen; ZHANG Yanji; SUN Yanguo; XIE Shishu; TANAKA Keisuke. Near Threshold Fatigue Crack Growth Behavior in Stainless Steel. Acta Metall Sin, 2005, 41(7): 721-726 .
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Abstract Near threshold fatigue crack growth tests were conducted under
torsion on circumferentially pre--cracked round bars of a
stainless steel. The crack growth rate was decreased with
crack extension because of the sliding contact of the crack
faces. The crack growth rate without the influence of crack
surface contact was determined by extrapolating the
relationship between the crack growth rate and the crack
extension to the zero crack length. The applied stress
intensity factor range is divided into two parts: one is the effective value
responsible for crack growth and the other is the shielding
value dissolved by crack surfaces contact. The
fatigue limits for crack initiation and fracture
were predicted and the predicted values agreed well with the
experimental results.
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Received: 04 November 2004
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