278 Computational Modelling of Biomechanics and Biotribology
the inner surface (set2). The following equation was used to de ne the cou-
pling between those sets:
ur
1
– ur
2
= 0 [9.1]
where ur
1
and ur
2
are the rotational degrees of freedom for set1 and set2,
respectively.
Additionally, two surfaces were chosen to de ne a surface-to-surface con-
tact between the specimen and the hammer. These surfaces are shown as
S1 and S2 in Fig. 9.5d. The master surface was chosen to be S2 with S1 cho-
sen to be the slave one. The mesh of the master surface was adjusted to be
ner than that of the slave surface. Finite sliding with a frictionless ...
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