Fatigue Measurement for Remaining Life
Final technical rept.
ARMY TANK-AUTOMOTIVE CENTER WARREN MI
Pagination or Media Count:
The objective of this work was to follow track pin surface residual stress as a function of fatigue test cycles. Twenty pins were selected from a group of 250 new T-142 track pins for this test. They were selected on the basis of being representative of pins having median values of surface residual stress as received from the shot peening operation in manufacturing. Residual stress measurements were made in both the longitudinal direction and hooptransverse direction at three spots on each pin. The spots were at areas most likely to develop cracking and eventual failure. The equipment used for residual stress measurement was automated X-ray diffraction equipment. Surface residual stress was found to remain virtually unchanged throughout the entire two million cycles of fatigue testing. Pins failing prior to the two million cycle test limit displayed no residual stress indication that failure was eminent.
- Couplers, Fasteners and Joints
- Combat Vehicles
- Fluid Mechanics