TourTouriso fAILURE mode classification for gears (ISO 10825)
Gear Damage
Failure modes of various machine elements are presented in chapter 7
 

Table 7.1: Failure mode classification for gears (ISO 10825).
1. Indications of
   surface disturbances
1.1 Sliding wear 1.1.1 Normal wear
         (Running in wear)
1.1.1.1 Moderate wear
1.1.1.2 Polishing
1.1.2 Abrasive wear
1.1.3 Excessive wear
1.1.4 Moderate scratching
          (Scoring)
1.1.5 Severe scratching
1.1.6 Interference wear
1.2 Corrosion 1.2.1 Chemical corrosion
1.2.2 Fretting corrosion
1.2.3 Scaling
1.3 Overheating
1.4 Erosion 1.4.1 Cavitation erosion
1.4.2 Hydraulic erosion
1.5 Electric erosion
2. Scuffing
3. Permanent
    deformations
3.1 Indentation
3.2 Plastic deformation 3.2.1 Plastic deformation
         by rolling
3.2.2 Plastic deformation
         by tooth hammer
3.3 Rippling
3.4 Ridging
3.5 Burrs
4. Surface fatigue
    phenomena
4.1 Pitting 4.1.1 Initial pitting
4.1.2 Progressive pitting
4.1.3 Micro pitting
4.2 Flake pitting
4.3 Spalling
4.4 Case crushing
5. Fissures and cracks 5.1 Hardening cracks
       (Quench cracks)
5.2 Grinding cracks
5.3 Fatigue cracks
6. Tooth breakage 6.1 Overload breakage 6.1.1 Brittle fracture
6.1.2 Ductile fracture
6.1.3 Semi-brittle fracture
6.2 Tooth shear
6.3 Breakage after
       plastic deformation
       (Smeared fracture)
6.4 Fatigue breakage 6.4.1 Bending fatigue
6.4.2 Tooth breakage

 

www.tribology-abc.com