Numerical Simulation of Gear Fatigue Fracture Based on Dynamic Crack Propagation
At present,the internal fatigue fracture of gear directly threatens the safe operation of construction ma-chinery.In order to improve the safety of mechanical operation,a numerical simulation method for the reliability of in-ternal fatigue fracture of construction machinery gears was proposed.Firstly,a construction machinery gear model was constructed,and then the process for determining the theoretical contact line of the gear was provided.Secondly,the boundary element method was adopted to solve the internal stress intensity factor of the gear.Meanwhile,the internal mechanical properties of the gear were analyzed.Based on the analysis results,combined with the internal limit state of the gear,a model of internal fatigue fracture reliability was built.Finally,the entire process of internal fatigue frac-ture of the gear was simulated by an internal fatigue crack dynamic propagation model,thus achieving numerical simu-lation for the reliability of internal fatigue fracture of construction machinery gears.After applying the suggested meth-od,we found from experimental results that the internal fatigue crack propagation rate and the numerical simulation re-sults of gear fatigue fracture reliability are basically consistent with the actual results,indicating that the method has high numerical simulation accuracy.
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