Abstract
The statistic of machined surface asperity heights is very important for the plane joint problems of machine structure. This paper deals with the probability density function of asperity heights, the correlation between the standard deviation and the maximum height, the effect of the stylus radius of profilometer on the statistic of asperity heights and so on. The results are as follows.
(1) The effect of the stylus radius on the statistic of asperity heights is negligibly small.
(2) The probability density function of asperity heights is approximated by the normal distribution, but by the Weibull distribution at the higher range of asperities.
(3) The standard deviation of asperity heights can be estimated by the maximum heights.
