Study on Predicting Residual Life of Elevator Links by Fracture Mechanics Approach

摘要

On the basis of investigation, failure and fracture analysis of elevator links, residual life prediction of links using fracture mechanics approach is studied, and mechanical properties, fracture toughness value K{sub}(IC) and fatigue crack propagation rate da/dN of the steel for elevator links are determined. Using the relation between stress intensity factor K{sub}I and the strain- energy release rate, the two-dimensional conversion thickness finite element method has been used to calculate the stress intensity factors K{sub}I for dangerous sections in the ring part of links. Further more, the reliability of calculations of the finite element stress intensity factors K{sub}I for dangerous sections of elevator links and the residual life computation for links are verified by fatigue tests of actual links. Finally, the experimental verification of computed results by 150T link fractured at site indicates that the computed critical crack lengths and residual life tally well with those measured and meet the needs of oil drilling.