HIGH TEMPERATURE FATIGUE BEHAVIOR OF 7075A1 VIA LOW PLASTICITY BURNISHING

Document Type : Original Article

Authors

Lecturer and ** Professor and Chairman Department of Production Engineering and Mechanical Design, Faculty of Engineering, Menoufiya University, Shebin El-Kom, Egypt

Abstract

Rotating bending fatigue is considered to be an important characteristic of the
mechanical parts. Herein, the high temperature fatigue behavior of 7075 aluminum is
studied in terms of different mechanical and heat treatment procedures. These
experiments were carried out in order to gain additional knowledge regarding the
relationship between these processes and thefatigue behavior of the present alloy. A
rotating bending test machine has been used to reach these goals. The fatigue
experiments were performed under two different testing temperatures, 250 and 300
"C, along with the room temperature experiments. Low plasticity burnishing
technique was applied on part of the specimens as a mechanical means for enhancing
the fatigue strength of the present alloy.
The results of the present work show that burnishing processes has played a
considered role in increasing the fatigue strength of the present alloy. The enhanced
fatigue resistance of the burnished specimens at high and room temperature was
largely due to overall increase in the strength of the surface layer and delayed fatigue
crack initiation on the surface.

Keywords

ERJ. Engineering Research Journal
Volume 25, Issue 2
April 2002
Pages 135-145

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