Safety Evaluation For Shipbuilding Crane Base On Fatigue Failure

Shipbuilding crane shipbuilding lifting operations equipment, with the development of the shipbuilding industry, more and more heavily work, the metal structure prone to fatigue damage, and often lead to major security incidents. For a long time, the crane metal structure fatigue damage detection, analysis, safety evaluation has been a project of technical problems, and its conduct in-depth studies have important academic value and practical significance.This paper summarized the research status of the crane metal structure fatigue damage and the existing problem. The uncertainties factor was analysed which leaded to metal fatigue damage based on the shipbuilding crane metal structure type and load characteristics. And then revealed the main crane hazards is the failure through statistical analysis.Based on the theory of fracture mechanics and materials science, the metal structural fatigue crack formation and propagation rate have been analysed in the paper. At the same time, the fatigue crack growth prediction method has been found based on the Paris crack growth rate formula.As the uncertainty of the shipbuilding crane fatigue damage development with the guidance of the statistical theory, the load spectrum has been analysed deeply in the paper, and then the load spectrum techniques and methodology has been developed after understanding of the shipbuilding crane load spectrum meaning and preparation requirements, combining with the actual use of gantry cranes,a case study of this type of crane load spectrum has been done, and was builded the technical foundation for the future to promote the application shipbuilding crane load spectrum.Finally, shipbuilding crane metal structure safety evaluation method has been developed, and was builded a safety evaluation framework and process steps, and analysed the evaluation of the strength, stiffness, stability, fatigue cracks, deformation, corrosion, and maintenance of the metal structure, which has been quantified and normalized. The weighting factor has been determined by AHP, the shipbuilding crane metal structure safety evaluation system to establish based on fuzzy math, and case studies completed shipbuilding crane metal structure safety evaluation system applications.This research work will provide useful help to improve the shipbuilding crane safety and prevent accidents.