Fretting fatigue behavior of Al7075-T6 at sub-zero temperature |
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Authors: | G.H. Majzoobi R. Hojjati |
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Affiliation: | a Mechanical Engineering Department, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran b Department of mechanical construction and production, Ghent University, Ghent, Belgium c Mechanical Engineering Department, Faculty of Engineering, TIAU University, Takestan, Iran |
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Abstract: | In some fretting fatigue applications, such as aero industry, the temperature may drop well below −50 °C Fretting fatigue behavior of aluminum alloy Al7075-T6 is investigated at temperatures of 24, 0, −25 and −50 °C in this work. The results show that (i) normal fatigue life increases considerably at sub-zero temperatures up to around 85% for low working stresses and reduces to about 40% for higher working stresses; (ii) fretting fatigue life at sub-zero temperatures rises significantly up to around 220% for low working stresses and reduces to about 50% for higher working stresses; (iii) ultimate strength of material changes from −15% to 15% under the fretting fatigue test conditions; and finally (iv) some parameters such as mechanical properties and fatigue behavior of material at low temperatures, contact load relaxation, crack closure, oxidation and some unknown sources can be thought to be responsible for fretting fatigue behavior of Al7075-T6 at sub-zero temperatures. |
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Keywords: | Sub-zero temperatures Al7075-T6 Fretting fatigue Working stress |
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