Abstract
On the basis of the energy approach of fracture mechanics, we construct a computational model of propagation of plane fatigue macrocracks in three-dimensional deformable elastoplastic bodies. We deduce a kinetic equation that enables us to determine the period of subcritical growth of a fatigue macrocrack corresponding to the residual life of an element of the metal structure weakened by a crack under external cyclic loading. To test the model and find the unknown physicomechanical constants of the material, we study specimens from the sections of welded joint of 1201-T aluminum alloy. The obtained kinetic diagrams of fatigue fracture of these specimens reveal good agreement between the computed and experimental results. According to the results of the theoretical and experimental investigations, we construct the nomograms of residual life of the weld metal and the base metal of the welded joint of this alloy.
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