Ceramic ball bearing fracture test method

Details Ceramic ball bearing fracture test method Ceramic ball bearing fracture test method

2005-10-11

2005-10-11

Noori, Max (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

C073S825000

Reexamination Certificate

active

06952969

ABSTRACT:
A mechanical test method prescribes compressing brittle balls in spherical conforming opposing platens producing equatorial bulging, tensile stresses, and resulting indentation crack growth that is imaged for providing direct measurement of the fracture toughness of brittle balls, such as, silicon-nitride balls used in hybrid bearings as well as conventional steel ball bearings, with measurement errors being immune to characterizing the dimensions and positioning of the precrack indentations, so that, the test method is accurate, repeatable, and robust.

REFERENCES:
patent: 4677855 (1987-07-01), Coffin et al.
patent: 5369675 (1994-11-01), Diaz et al.

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