ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

4pSAb7. Observations of vibration-induced fatigue in steel using modal analysis.

Sevag H. Arzoumanian

Douglas P. Koehn

David C. Swanson

Appl. Res. Lab., Penn State Univ., P. O. Box 30, State College, PA 16804

The acceleration to force transfer functions across a shaker-excited thin band under tension with a deep notch cut through its center is examined up to the point of fatigue-induced failure. An analytical model is developed to track the changes in modal properties evident in the experimental results as a function of band parameters. The progression of the structure toward failure is documented by plots of rotational stiffness and crack length as a function of fatigue time.