But, when relative waviness comes into roughness, only the amplitude effect of surface topography should be considered.
当相对波度为高频的粗糙度时，只需考虑表面形貌的幅值效应。
The change in the specific roll pressure of workblanks is investigated as the tool surface roughness and the relative height of workblanks are changed.
探讨了具有不同表面粗糙度的工具和相对高度毛坯，在变形时单位压力的变化情况；
The friction factor obtained from the experiments increases with the surface roughness increase when the relative roughness is greater 1%.
实验结果表明当壁面粗糙度超过1%时摩擦系数随着壁面相对粗糙度的增加而增加。
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