Page 57 - Tribology in Machine Design

44 Tribology in machine design

For the material of the pin

The maximum shear stress t max =0.31g 0, where q 0=3W/2nab, and a is the
semimajor axis and b is the semiminor axis of the pressure ellipse. For the
2
2
assumed data g 0 = 789.5N/mm and T max = 245N/mm .
The number of sliding passes for the pin during one operation is

The number, L, of operations is given by

For zero wear, Q is given by

Therefore, the constant of integration Ci, is given by

6
Having determined C t , Q can be calculated for L = 10 revolutions

The volume of the wear debris is given by

As mentioned earlier, in the case of a lubricated system it is reasonable to
expect additional wear resulting from the adhesive process. The volume, F a,
of the wear debris resulting from adhesive wear must be determined using
relationships discussed earlier. For n-hexadecane as a lubricant we have:
12 7
to-2.8 x 10~ s, Z = 1.13xl(T cm and E c = 11 700cal/mol. Further-
more, /=0.26, ^=0.23, R = 1.9872cal/molK and T s = 295.7K. For these
parameters characterizing the system under consideration, the fractional