Abrasion

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LOW STRESS
Another term commonly used for this mode is scratching abrasion. This is essentially the primary mechanism of damage. Surface subjected to low stress abrasion show that material has been removed by hard, sharp particles, or other hard sharp surfaces plowing material out in furrows.

 

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HIGH STRESS
This form of abrasion is a characterized by scratching, plastic deformation of surfaces, and pitting from impressed particles. Damage is almost more severe than in low-stress abrasion. Plastic deformation of metal surfaces often occurs and deep scratches occurs in the direction of motion.

 

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GOUGING
Gouging abrasion is a material removal caused by the action of repetitive compression loading of hard material such as rocks against a softer surface, usually a metal. This form of abrasion is likely to be conjoint with both low and high-stress abrasion.

 

Image-Wear4POLISHING

Polishing wear is unintentional progressive removal of material from a surface by the action of rubbing from other solids under conditions that material is removed without visible scratching, fracture, or plastic deformation of the surface. The dictionary definition of polishing is to smooth or brighten. Surface that have been subject to polishing wear are usually smoothed or brightened, but this smoothing or brightening requires material removal and can cause a loss of serviceability in some parts. Dimensions can be changed enough to made a part unusable.