Explain why the same surface roughness values do not necessarily represent the same type of surface

Explain why the same surface roughness values do not necessarily represent the same type of surface. Please give some examples. Hint: surfaces that have the same Ra values, may be are very different geometrically and have different tribological performance. Give examples.

Expert Solution

same surface roughness values do not necessarily represent the same type of surface because Ra is the average of all height. Surface with many smaller height could have same Ra as mostly flat surface with a few larger heights. numerous diﬀerent surface proﬁles (as produced by diﬀerent manufacturing and ﬁnishing processes) that could give the same arithmetic mean value, Ra, or the rootmean-square roughness.

Amanda K answered 2 years ago

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