Description of Fatigue Damage Using a Damping Monitoring Technique

The fatigue behavior of materials has been estimated using many dierent experimental techniques in order to describe damage. Fatigue damage may increase the risk of failure under cyclic load. Energy dissipation occurs in engineering metals as a function of the cyclic loading history. In order to measure energy dissipation, a damping monitoring method that estimates damping factor by vibration excitation has been used in this study. Under constant cyclic axial loads, 50 % and 70 % of ultimate strength, the eects of the number of fatigue cycles on the damping factor were measured for two dierent low carbon steels. The experimental results showed that the damping factor changes with the number of fatigue cycles