Please note

1. Load is applied in perpendicular direction and sliding occurs in longitudinal direction. This means that both function in perpendicular to each other.. Now at low but variable (1, 1.2, 1.3, 1.4, 1.5, 1.7, ....)load for a fixed sliding speed the nature remains similar until frictional heat is not considerable.

Now if you increase the sliding speed, for a fixed load the rate of wear rate also increase but this increase is not much. After run in wear ie initial stage of wear it will become constant

However, if load is higher then the friction heat will contribute.

Please see some of our paper. Go to google scholar and down load those papers.

Thanks for your answer. I have seen in some case(usually wet wear conditions) that wear rate decrease with increasing sliding speed. In my view, it seems that applied load often is more effective on wear rate than sliding speed, in same situation indeed.

My answer pertains to dry sliding conditions.

your case is wet wear condition. hence wear property depend on the type of lubricant property you are using. Some time lubricant for a oxide layer over the surface and mild wear is possible with increasing sliding speed. Go through wear maps and know about the wear regime for dry sliding wear and then try to construct for wear maps for wet conditions.

Sliding speed has two main influences on the wear properties of materials. 1) the higher sliding velocity, the higher surface temperature (Q=u.W.V). Surface temperature may change the mechanical, and thus, wear properties of a material at the contact region. U can estimate surface temperature using different models available in the literature; 2) the higher sliding speed, the higher strain rate, increasing the brittleness of the worn material.

In the case of wet sliding, a higher sliding speed may negatively affect the lubricant efficiency as it influences the lubricant thickness.

Increasing load leads to increase in wear rate. However,  increasing sliding speed initially decrease the wear rate in steady state wear condition but beyond a critical velocity, the wear rate increases and finally  ceasure  takes place.