کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
615449 881445 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fretting fatigue behavior of Al7075-T6 at sub-zero temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Fretting fatigue behavior of Al7075-T6 at sub-zero temperature
چکیده انگلیسی

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.


► Fatigue behavior of Al7075-T6 at sub-zero temperature depends on stress level.
► Plain fatigue life increases and reduces for low and high stresses respectively.
► Fretting fatigue life also shows the same trend as plain fatigue life does.
► The change of behavior may be due to grain size, material properties and oxidation.
► Crack closure, contact load relaxation may also be effective.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tribology International - Volume 44, Issue 11, October 2011, Pages 1443–1451
نویسندگان
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