Expressing the change of distribution of the roughness pressed on a mirror surface, with a transformation of random variable into normal distribution, we got y=x
n(AB). This n(AB), determinated by combination of materials, is called coefficient of changing roughness of A for B. While k(AB), increasinn ratio for pressure P of strain of A pressed on B, is called combination hardness and is not determinated by only A but by B. In the graph of log P-log k(AB), there are two lines beyond which one inflececes on another as a rigid material. Then we conjecture n(AB) indirectly from k(AB) because measuring n(AB) is very troublesome. In the result we got κ(AB)=y
0k (AB)[numeical formula]; κ(AB)=1-n (AB), k (AB) is a rigid line, y
0, ν, g
0 are constants unrelated to materials. Using Brinell hardness H
A, H
B of those materials, we get K(AB)=3.0k
μ(A)(AB); k (AB)=18.2H
A-0.94, μ(A)=0.5-0.31/(1.68-1.29 log H
A)
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