Fatigue Fracture of a Steering Knuckle Caused by Deformation
A steering knuckle used on an earthmover failed in service. The component fractured into a flange portion and a shaft portion. The flange was 27.9 cm (11 in.) in diam around which there were 12 evenly spaced 16 mm diam bolt holes. The shaft was hollow with a 10.5 cm (4 in.) OD and a wall thickness of 17 mm. The steering knuckle was made of 4340 steel and heat treated to a hardness of about 415 HRB (yield strength of about 1069 MPa, or 155 ksi). The vehicle had been involved in a field accident six months before...
Fatigue Fracture of a Steering Knuckle Caused by Deformation, ASM Failure Analysis Case Histories: Construction, Mining, and Agricultural Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.conag.c0047212
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