ETL 1110-2-560
30 Jun 01
Table D-2. Primary Machinery Component Failure Modes (Bloch and Geitner 1994)
Weibull
Standard
Index β
Failure Mode
Life
Deformation
Brinelling
1.0
Inf
Cold flow
1.0
Inf
Contracting
2.0
Inf
Creeping
2.0
Inf
Bending
1.0
Inf
Bowing
1.0
Inf
Buckling
1.0
Inf
Bulging
1.0
Inf
Deformation
1.0
Inf
Expanding
1.0
Inf
Extruding
1.0
Inf
Growth
1.0
Inf
Necking
1.0
Inf
Setting
2.0
Inf
Shrinking
2.0
Inf
Swelling
3.0
Inf
Warping
1.0
Inf
Yielding
1.0
Inf
Examples:
Deformation of springs
1.0
Inf
Extruding of elastomeric seals
1.0
4.0Y
Force-induced deformation
1.0
Inf
Temperature-induced deformation
2.0
Inf
Yielding
1.0
Inf
Fracture/Separation
Blistering
1.0
Inf
Brittle fracture
1.0
Inf
Checking
1.0
Inf
Chipping
1.0
Inf
Cracking
1.0
Inf
Caustic cracking
1.0
Inf
Ductile rupture
1.0
Inf
Fatigue fracture
1.0
Inf
Flaking
1.0
Inf
Fretting fatigue cracking
1.0
Inf
Heat checking
1.0
Inf
Pitting
1.0
Inf
Spalling
1.0
Inf
Splitting
1.0
Inf
Examples:
Overload fracture
1.0
Inf
Impact fracture
1.0
Inf
Fatigue fracture
1.1
Inf
Most fractures
1.0
Inf
Change of Material Quality
Aging
3.0
5.0Y
Burning
1.0
Inf
Degradation
2.0
3.0Y
1.0
Inf
Discoloration
1.0
Inf
1.0
Inf
Embrittlement
1.0
Inf
Hardening
1.0
Inf
Odor
1.0
Inf
Overheating
1.0
Inf
Softening
1.0
Inf
Note: Inf = Infinite
M = Month(s)
Y = Year(s)
(Sheet 1 of 3)
D-5
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