FATIGUE STRENGTH OF 7075-T6 ALUMINIUM ALLOY UNDER COMBINED AXIAL LOADING AND TORSION |
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| Authors: | K. Tanaka S. Matsuoka M. Kimura |
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| Affiliation: | Department of Mechanical Engineering, The Technological University of Nagaoka, Nagaoka, Niigata 949–54;Fatigue Testing Division, National Research Institute for Metals, Nakameguro, Meguro, Tokyo 153, Japan |
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| Abstract: | The fatigue strength of 7075-T6 aluminium alloy under combined axial loading and torsion was examined. The S-N relations were correlated with the von Mises criterion for the high cycle region ( N f≥ 104 cycles) and with the Tresca criterion for the low cycle region ( N f < 104 cycles), where N f is the cycles to failure. This transition at N r= 104 cycles was related to the occurrence of macroscopic plastic straining and a change in fracture modes. The results are discussed in comparison with those for a high strength steel (SNCM8) in a previous study. Particular attention is given to differences in cyclic deformation behaviour, fracture modes and fatigue crack growth rates between the two materials. |
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