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Since the time of the original Greenwood & Williamson paper, it was noticedthat abrasion and wear lead to possibly bimodal distribution of asperity heightdistribution, with the upper tail of asperities following from thecharacteristics of the process. Using a limit case solution due to Borucki forthe wear of an originally Gaussian distribution, it is shown here that the tailis indeed always Gaussian, but with different equivalent parameters. Therefore,if the wear process is light, one obtains a bimodal distribution and both mayaffect the resulting contact mechanics behaviour. In this short note, weillustrate just the main features of the problem. We conclude that it is anoversimplification to consider surfaces Gaussian.

On the effect of wear on asperity heigth distributions, and the corresponding effect in the mechanical response