Effects of elastoplastic deformation and creep in threaded connections

The specificity of loading conditions for critical threaded connections of power equipment is shown. Approaches to determination of their stress-strain states, which are dictated by redistribution of stresses and strains in turns of the thread under the static and low-cycle loading, are considered. The technique for experimental investigations of plastic deformations and creep deformations of bolts at the normal temperature is represented. This makes it possible to determine the tightening reduction in bolts.