Break, Brinelling, Brittle, Buckle, Bulge, and Burn Marks

Tabel 2.1 c

DEFFECT	DESCRIPTION
Break	Complete separation by force into two or more pieces. Usual causes are fatique or sudden overload
Brinelling	Indentations some times found on the surface of ball or roller bearing parts. Usual cause are improper assembly or dissasembly techniques by the aplication of force on the free race. Bearing which do not have full, constant rotation and are subject to sudden loading, have brinelling tendencies.
Brittle	A large scale deformation of the original contour of the part. Usually caused by aging, extreme cold, chemical action, or cold working
Buckle	A large scale deformation of the original contour of the part. Usually caused by pressure or impact from a foreign object, structural stresses, excessive localized heating, high pressure differentials, or any other combination of these
Bulge	An outward bending or swelling. Usual cause is excessive pressure or weekening due to excessive heat.
Burn marks	Localized indication of excessive heating (for example, blue to blue blackdiscoloration) due to excessive dwell time of a tool at that location, or electrical arcing due to improper contact between an electrode and the part.