Crystallographic analysis on small fatigue crack propagation behaviour of a nickel-based single crystal superalloy |
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Authors: | W Qiu X Ma S Rui H-J Shi |
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Affiliation: | 1. AML, School of Aerospace Engineering, Tsinghua University, Bejing, 100084 China;2. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082 China |
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Abstract: | In situ observations by scanning electron microscopy show that small fatigue cracks in a nickel-based single crystal superalloy are inclined to the loading direction and propagate in dominant crystallographic manners. In order to evaluate the driving forces for inclined crack propagation, three-dimensional anisotropic linear elastic finite-element analysis is conducted. The plastic zone size on the dominant slip plane has been calculated and proposed to correlate the fatigue crack growth. It is shown that this parameter takes into account both material anisotropy and octahedral fracture modes, and it can effectively characterize small crack propagation behaviour. |
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Keywords: | small crack growth single crystal superalloy finite-element analysis plastic zone size dominant slip plane |
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