Initiation and propagation of fatigue crack in pure aluminium single crystals |
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| Authors: | Z.Q. Mu Z.M. Zhu S.H. Yang Z.G. Wang |
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| Affiliation: | 1. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Mechanical Engineering of NingXia University, NingXia 750021, China;1. Department of Mechanical Engineering, Isfahan University of Technology, 84156-83111 Isfahan, Iran;2. Libera Università di Bolzano/Bozen, Facolt à di Scienze e Tecnologie, piazza Universit à, 1, 39100 Bolzano, Italy;3. Department of Mechanical and Production Engineering, Aarhus University, Inge Lehmanns Gade 10, 8000 Aarhus C, Denmark;1. Refueling Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;3. Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;1. Department of Mechanical Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0276, USA;2. Boeing Research & Technology, The Boeing Company, Berkeley, MO 63134, USA |
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| Abstract: | The fatigue crack initiation and propagation in the pure aluminum single crystals with different orientations are investigated. Acoustic Emission (AE) technique is used to monitor the fatigue crack initiation and propagation data. The results show that the acoustic emission technique could be used for detecting fatigue crack initiation and propagation. The total counts of AE are plotted as a function of the number of fatigue cycles, and change in slope of the curve corresponded to the initiation of the fatigue crack. The fatigue crack initiation and propagation are related to the specimen crystalline orientation. Specifically, they depend on the ratio K of the Schmid factor of the secondary slip system, to that of the primary one. The greater the ratio K, the easier the fatigue crack initiates and the faster the fatigue crack propagates. When the ratio K is equal or close to one, the fatigue crack grows either along a cleavage plane which intersects both the primary plane and the secondary one or along the primary slip plane and the secondary one. Growth along alternating planes can also occur giving rise to a zigzag path. When the ratio K is much less than one, the fatigue crack grows along the primary slip plane only. The results are explained with a model for the faceted mode of fatigue crack growth. |
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