A circular shaft (Fig. 28) inserted into a tube is kept in it by friction forces. The value of tightness contact pressure which produces these friction forces as well as the value of the friction...

A circular shaft (Fig. 28) inserted into a tube is kept in it by friction forces. The value of tightness contact pressure which produces these friction forces as well as the value of the friction coe¢cient may be considered constant for the whole contact zone with su¢cient degree of accuracy. Equal and opposite moments M are applied to shaft and tube. Under M>M0 shaft and tube are turning relative to each other. It is necessary to sketch the torque epure for shaft and tube under M.