VALERIU V. JINESCU DURATA DE VIATÃ A ECHIPAMENTELOR DE PROCES FABRICATE DIN MATERIALE NELINEARE
The fatigue life calculation for process equipment like chemical and petrochemical reactors, centrifuge, supercentrifuges etc. is important from the safety point of view. The fatigue life deduced in this paper depends on the effective dimension of the crack as well as on the mean stress, which represents a progress compared to the fatigue life value calculated based upon the stress intensity factor, where the mean stress is not taken into account. Using non-dimensional concepts, introduced by the critical energy principle, and by defining them in the case of fatigue loading of materials with cracks, a unitary theory was established for the fatigue life of nonlinear materials with cracks under cyclic loading.