In order to explain the effect of normal stiffness in the loading system on wear, the mean dynamic normal load and the effective sliding distance were determined from the record of dynamic normal load. The mean dynamic normal load was approximately constant at normal stiffnesses smaller than 10 N/mm and increased markedly at normal stiffnesses larger than 103 N/mm. The effective sliding distance was approximately equal to the apparent sliding distance at normal stiffnesses smaller than 10 N/mm and decreased markedly at normal stiffnesses larger than 103 N/mm. The effective wear rate was newly defined in terms of the effective sliding distance. The change of effective wear rate with the change of sliding velocity was linearly correlated to the change of mean dynamic normal load under each normal load and normal stiffness.

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