Design Features And Results From Fatigue-reliability-research Machines

Author:  Lalli, Kececioglu and McConnell
Source:  SESA, Vol. XXI|X, No. 2
Doc ID:  1972031
Year of Publication:  1972
Abstract:  
The design, fabrication, development, operation, calibration and results from reversed bending combined with steady torque fatigue research machines are presented. fifteen centrimeter long, notched, SAE 4340 steel specimens are subjected to various combinations of these stresses and cycled to failure. Failure occurs when the crack in the notch passes through the specimen automatically shutting down the test machine. These cycles to failure data are statistically analyzed to develop a probabilistic S-N diagram. These diagrams have many uses including the design of rotating components having minimum size and weight for a specified number of cycles and reliability.