Torsional-Fatigue Fracture of a Large 4340 Steel Shaft That Was Subject to Cyclic Loading and Frequent Overloads
A 4340 steel shaft, the driving member of a large rotor subject to cyclic loading and frequent overloads, broke after three weeks of operation. The driving shaft contained a shear groove at which the shaft should break if a sudden high overload occurred, thus preventing damage to an expensive gear mechanism. The rotor was subjected to severe chatter, which was an abnormal condition resulting from a series of continuous small overloads occurring at a frequency of around three per second. Investigation (visual inspection, hardness testing, and hot acid etch images) supported the conclusion that the basic failure mechanism was...
Torsional-Fatigue Fracture of a Large 4340 Steel Shaft That Was Subject to Cyclic Loading and Frequent Overloads, ASM Failure Analysis Case Histories: Failure Modes and Mechanisms, ASM International, 2019, https://doi.org/10.31399/asm.fach.modes.c0091096
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