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Growth behavior of short surface fatigue cracks in 2 1/4 Cr-1 Mo steel |
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| Authors: | Chang Min Suh Robert O Ritchie Young Goo Kang |
| Affiliation: | 1. Department of Mechanical Engineering, Kyung-pook National University, 702-701, Taegu, Korea 2. Department of Materials Science and Mineral Engineering, University of CA, 94720, Berkeley, CA, USA 3. Department of Mechanical Engineering, Kumho Institute of Technology, Kyung pook, 730-070, Kumi, Korea |
| Abstract: | Fatigue tests by axial loading (R-0.05) were carried out to investigate short fatigue crack growth behavior in 2 1/4 Cr-1 Mo steel at room temperature using smooth and a small notched flat specimen. All the data of the fatigue crack growth rate in the present tests were analyzed as a function of the stress intensity factor equation in conjunction with crack closure behavior. Analysis was performed accounting for the relation of surface effective stress range,Ua and depth effective stress range,Ub. In the case of isotropic crack growth properties,Ub=(ΔKta/ΔKtb) ·Ua. By use ofUb obtained from the analysis, crack growth rates to surface direction coincide with those of depth direction. |
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