Fatigue Fracture of 1045 Steel U-Bolts on a Tractor Fitting
SAE grade 5 U-bolts were used to fasten auxiliary dual wheels to the axles on a farm tractor. Under typical farm usage, the bolts are expected to have infinite life. However, several U-bolts made of 29 mm diam rod broke after less than 100 h of service. The bolt legs in which the failures occurred were all in the same position relative to the direction of wheel rotation. Visual examination showed the break was a fairly flat transverse fracture in the threaded section between the washer and the nut. The appearance of the fracture surfaces was characteristic of failure...
Fatigue Fracture of 1045 Steel U-Bolts on a Tractor Fitting, ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.conag.c0048596
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