Crane Mechanics Crack Growth Life Analysis Method Research Based SIF Amplitude Fitting

Abstract:

At present, the crane metal structure cracks are ignored based on the traditional strength theory in the crane engineering design. As enlarging of crane mechanics, although their maximum stress don’t exceed allowed stress, recently considerable number of serious crane accidents happened, that are caused by the fracture because of crack faults. It is essential to analyze crack growth based on fracture mechanics in design or diagnose. The crack analysis consists of determination of the crack growth trajectory and calculation of crack growth rate. In generally, the crack of crane is supposed as I-mode in the engineer application. So the crack growth trajectory can be determinated without calculation, which simply cracks trajectory analysis. Then the crack growth rate will be calculated according to the Paris formula. The Paris’s formula is put forward as the form of the relation between stress value and crack length often. To improve the precision, a new method is put forward in the paper. According to the method, the form of Paris’s formula is function of the stress intensity factor (SIF). The new method is valid and high precision through the comparing with the boundary collocation method and the traditional method. And then an example of crack growth analysis on crane is given; the analysis procedure is described also. The method has a benefit to prevent fracture failure and it is supplement to the traditional strength design method also

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 4432-4438
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.4432
• Online since: November 2011
• Authors: Yuan Tao Sun, Shao Mei Wang
• Keywords: Crack Growth, Failure Analysis, Fracture, Paris’s Formula, Stress Intensity Factor (SIF)

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DOI: 10.1007/bf02437869