@Article{cmes.2020.08498,
AUTHOR = {Qing Dong, Bin He, Gening Xu},
TITLE = {Fatigue Life Evaluation Method for Foundry Crane Metal Structure Considering Load Dynamic Response and Crack Closure Effect},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {122},
YEAR = {2020},
NUMBER = {2},
PAGES = {525--553},
URL = {http://www.techscience.com/CMES/v122n2/38312},
ISSN = {1526-1506},
ABSTRACT = {To compensate for the shortcomings of quasi-static law in anti-fatigue analysis
of foundry crane metal structures, the fatigue life evaluation method of foundry crane 
metal structure considering load dynamic response and crack closure effect is proposed. 
In line with the theory of mechanical vibration, a dynamic model of crane structure 
during the working cycle is constructed, and dynamic coefficients under diverse actions 
are analysed. Calculation models of the internal force dynamic change process of 
dangerous cross-sections and a simulation model of first principal stress-time history are 
established by using the steel structure design criteria, which is utilised to extract the 
change of first principal stress of danger points over time. Then, the double-parameter 
stress spectrum is obtained by the rain flow counting method. The fatigue life calculation 
formula is corrected by introducing a crack closure parameter that can be calculated by 
the stress ratio and the effective stress ratio. Under the finite element model imported into 
Msc. Patran, crack propagation analysis is performed by the growth method in the fatigue 
integration module Msc. Fatigue. Taking the metal structure of a 100/40t-28.5m foundry 
crane with track offset as an example, the accuracy of calculation results and the 
feasibility and applicability of the proposed method are verified by theoretical calculation 
and finite element simulation, which provide a theoretical basis for improvement of the 
fatigue resistance design of foundry cranes.},
DOI = {10.32604/cmes.2020.08498}
}