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buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

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216 Marian Teodor Popescu et al.<br />

Speed, m/s<br />

μ<br />

max<br />

μ<br />

min<br />

Fig. 2<br />

Table 4<br />

Friction coefficient<br />

μ Evolution<br />

mediu<br />

1 0.1 0.58 0.23 0.48 Increasing<br />

2 0.25 0.98 0.52 0.69 High variations of the friction quotient<br />

value<br />

3 0.5 0.84 0.56 0.68 Variations decrease and appears the<br />

stability tendency<br />

4 0.75 0.77 0.55 0.63 Oscillations around 0.5<br />

5 1 0.73 0.55 0.61 Oscillations around 0.5<br />

6 1.25 0.73 0.56 0.62 Oscillations around 0.5<br />

7 1.5 0.72 0.57 0.63 Oscillations around 0.5<br />

Disc<br />

Before the test After the test<br />

Pawn after the test<br />

Fig. 3

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