Near Threshold Fatigue Crack Propagation Under Combined Torsion And Tension In Stainless Steel

Acta Metall Sin

2006, Vol. 42

Issue (2): 186-190 DOI:

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Near Threshold Fatigue Crack Propagation Under Combined Torsion And Tension In Stainless Steel

HuiChen Yu

北京航空材料研究院

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HuiChen Yu. Near Threshold Fatigue Crack Propagation Under Combined Torsion And Tension In Stainless Steel. Acta Metall Sin, 2006, 42(2): 186-190 .

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Abstract Near-threshold fatigue crack propagation tests were conducted under combined torsion and tension on a circumferentially pre-cracked round bar of an austenite steel. The propagation behavior was studied extensively under various combinations of cyclic loads. The threshold condition of fatigue crack extension was expressed by a quarter-elliptic function in terms of the stress intensity factor ranges for mode I and III. The equation can be derived on the basis of the crack-tip displacement criterion. The threshold condition for fracture is also expressed by another quarter-elliptic function.

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Received: 26 May 2005

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