5.7.5 Measurements
of Abrasion
Measurements of abrasion directly or indirectly
characterise the change in shape or mass of a body as a result
of abrasion. Because such measurements do not represent properties
of the material but rather of the system, it is only worth
quoting figures if the stress system and the structure of
the tribological system is described at the same time. The
following measurements of abrasion are in use:
Linear abrasion figure: Change in thickness
of the abraded surface. Symbol: WL Unit: m
Planimetric abrasion figure: The area of
a section perpendicular to the abraded surface that is removed.
Symbol: Wq Unit: m²
Volumetric abrasion figure: Change in volume
of the abraded body (volume abrasion). Symbol: WV Unit: m³
Abrasion mass: Change in volume of the
abraded body (mass abrasion). Symbol: Wm Unit: kg
Relative abrasion figure: The ratio between
the abrasion figures of an abraded body and of a reference
body abraded under identical conditions. Symbol: Wr Unit:
- or %
Abrasion resistance: The reciprocal value
of the abrasion figure Symbol: 1/W Unit: m-1, m-2,
m-3, kg-1
In practice it is common to link the abrasion figure with
some reference magnitude. Parameters typically measured include
the abrasion speed, abrasion intensity (ratio of abrasion
to distance), abrasion/throughput ratio, abrasion-limited
life, abrasion-limited throughput quantity.
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