Hi Asad,

1)total Wear volume is the total sum of all all data points?

The total wear volume is the sum of each wear volume given every 0.328 seconds.

2)Total wear rate?average or sum?( i assume sum is the right option)

For the total wear rate, you need to divide the previous total wear rate over the sliding distance (200 m)

3) cof?( i assume an average of all datapoints should be taken)

For the COF, the average can be use, but I recommend you to have a look on the trend of cof curve versus time or sliding distance to ensure that the average cof value will make sense.

How to calculate wear rate? (researchgate.net) you can see a good contribution attached from Dr. Emad Toma Karash that could help you.

I hope that this info could help you,

"distance=Distance in mm"

Probably, the distance should be used in m ?

Serge V. Shil’ko The units have to me changed.Wear coefficient is unitless.SO m has to be converted to mm in order for units to cancel each other out

@mohamadou Diew Thank yo so much for the explanations. A manual calculation by adding all set points of mm3 and dividing by total distance covered.

I have 2 load 10 and 40 newton. Same sliding speed for alls amples. Should i quoute specific wear rate or just wear rate

I assume the wear volume data is that in the last column. In which case it appears to be showing the accumulated wear. Plot that wear data against sliding distance (time). If that gives a linear relationship then a wear rate can be deduced. If it is not linear then it shows that there may be a running in phase that should be assessed to find a steady state wear rate.

Similarly with friction. Plot the individual friction coefficients against sliding distance (time). Again, is it constant or is a running in effect observed.

Hope this helps.

Total wear is the last result compared to the initial one. Please consider that wear can be given in volume or in weight. The difference is the density of the material tested. Take care when comparing to literature.

Wear rate is average but better give a plot because it changes - first it is fast and after a time it levels up.

The first question you should ask yourself is what is the goal of the experiment (s)?? Is the goal to just produce numbers or to discover, then predict, behavior??

The analysis and eventually your choice of wear volume or wear mass (detailed or averaged) etc, will depend on your goal

Since the tribometer data gives wear volume(mm3), wear rate(mm3/m), and cof with an interval of 0.328 seconds, you need to divide the total wear volume by (1/0.32). Do remember to remove the initial running-in value from your actual reading.

Also do consider calculating the degradation coefficient (B) values, rather than Archard's coefficient (K). The value of B is more realistic than K. The details can be found in the following paper.

Koottaparambil, Lijesh, and Michael M. Khonsari. "A Unified Treatment of Tribo-Components Degradation Using Thermodynamics Framework: A Review on Adhesive Wear." Entropy 23, no. 10 (2021): 1329.

Kindly refer this article.

Article Parameter optimization for enhancing tribological properties...