Slow sliding speed (left) leaves the structur of the metal intact. Fast sliding (middle) completely destroys it. Extremely fast sliding (right) partly melts the uppermost layer, but this effect protects the layers below.
Slow sliding speed ( left ) leaves the structur of the metal intact. Fast sliding ( middle ) completely destroys it. Extremely fast sliding ( right ) partly melts the uppermost layer, but this effect protects the layers below. A seemingly paradoxical effect: friction normally causes more damage at higher speeds. But at extremely high speeds, it is the other way around. When two metal surfaces slide against each other, a variety of complicated phenomena occur that lead to friction and wear: Small crystalline regions, of which metals are typically composed, can be deformed, twisted or broken, or even fuse together. It is important for industry to understand such effects.
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