Analytical on Fatigue Behavior of Counter Shaft in Pick-Up Car

Abstract

This aims of this research to the fatigue life evaluation of counter shafts under cyclic load of SCM420 steel. The focus is on the study of test specimens from old and new secondary shafts of automobiles. The tests were conducted using an R.R. Moore fatigue testing machine. There were tests for 5 specimens, each with a length of 90 mm and a diameter of 8 mm, and the loads were different according to five pendulum weights: 60, 80, 100, 120, and 140 N. The test results showed that the S-N Curve were in a decreasing curve. The maximum counted fatigue life of the old shafts were 2,618, 628 cycles, and the maximum counted fatigue life of the new shafts were 4,158,674 cycles, using the same counterweight of 60 N. When compared the fatigue life was different by 10 times. It can be concluded that when the stress level applied to the test pieces was reduced, Fatigue life will increase along the S-N Curve and the fatigue life evaluation results from R.R. Moore test were compared with the results of numerical simulation using Ansys program. It was found that the evaluation rate of Ansys program was higher than the experiment by about 5%.