1-hardness of hard material is not considered
2-not discuss multipass
3-not addressed the role of wear debris size and shape
4-hardness after experiment not considered.
I wish to know more points, apart from the above plz suggest.
To my opinion there is one limitation inherent with almost all wear laws. It is that no subsurface material structural evolution has ever been considered. Also adhesion wear between the deformationally and chemically modified surfaces has neither been considered. Both these phenomena change greatly the subsurface hardness as well as the real contact area so that initiallly hard materials easily deform plastically.
Can refer to ASM Handbook Vol 18.
Archard’s equation did not consider the effect of sliding speed, temperature, non-linear sliding behaviors.
Archard equation W=k*Wn*s/H allows the calculation of wear volume, but one problem is the hardness H of the softer material at the sliding interfase. Since wear at the boundary/mixed or hydrodynamic regime only takes place in the few microns range, this hardness is not easy to measure, due to the fact that bulk hardness is the one that is involved using vickers and rockwell methods and usually during sliding the top surface suffers strain hardening. This is the reason why is preferable to use wear rate Wr=V/Wn*s
Where V is wear volume Wn is normal load and s sliding distance, being this equation independent of hardness.
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