DOI: https://dx.doi.org/10.24866/2227-6858/2019-3-3

Budrin S., Ovsyannikov V.

SERGEY BUDRIN, Candidate of Engineering Sciences., Head of the Department, e-mail: Budrin@msun.ru
Department of Material Handling Equipment Operations and the Fundamentals of Machine Design
Maritime State University named after Admiral G.I. Nevelsky
50-a Verkhneportovaya St., Vladivostok, Russia, 690003
VIKTOR OVSYANNIKOV, Candidate of Engineering Sciences, Associate Professor, e-mail: Ovsyannikov.vv@dvfu.ru
Far Eastern Federal University
8 Sukhanova St., Vladivostok, Russia, 690091

Residual life analysis of metal structures of reloading machines under crack resistance conditions

Abstract: The authors present the experience of applying their methodology for predicting the residual life of metal structures of reloading equipment according to the criterion of the fatigue crack growth to a critical size, which they have used for assessment of complex metal structures of reloading machines at the commercial sea ports over the past 5 years. The methodology is based on the well-known calculated dependencies of fracture mechanics, modified and updated with elements that take into account the specifics of the operation of transshipment machines in difficult weather conditions. Particular attention was paid to the accuracy of determining the stresses in a metal structure element during work operations due to the constantly changing magnitude of the load acting on the metal structure depending on the weight of the load lifted and the position of the machine in space. To confirm the high sensitivity to the accuracy of the determination of stresses, the dependence of the influence of the resource of a metal structure element with a crack on the stress amplitudes is graphically presented. The methodology for assessing the residual resource has been successfully tested on a number of complex metal structures of transshipment machines of the Far Eastern ports and can be recommended for assessing the residual life of metal structures of heavy duty construction and earth-moving machinery.
Keywords: metal structures, crack size, stress range, reloading machines, residual life, element destruction.

Download article in PDF format