S.M. Pezeshki - Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
H Badnava - Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
F. Fereshteh-Saniee - Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

T-shape compression test is a newly introduced friction test for evaluation of frictional condition in metal forming processes. This test includes large surface expansion and high contact pressure within the contact surfaces, similar to what is occurred during a real forming operation. Therefore the resulted friction factors are reliable and applicable. One of the friction tests which widely used for evaluation of frictional conditions in forming operations is the ring compression test. This test is very simple and does not require manufacturing a specific die. In the present research, the frictional conditions of hot magnesium forming were studied experimentally using the ring and T-shape compression tests. The tests were conducted in the same temperature and ram velocity. Three different lubrication conditions and two different die geometries of the T-shape tests were used. Finally the resulted friction factors, surface expansion ratio and maximum contact pressure in these tests were compared.

Friction, T-shape compression test; Ring compression test; Hot magnesium forming;