Simulation Analysis On Cracking Fatigue Life Of YXG500 Continuous Wall Grab Main Turntable

The continuous wall grab receives the alternating load in the work process,extremely easy to have the fatigue failure.Some company develops the production and the operational continuous wall grab some constructs for 3 months in Zhengzhou to appear the host platform left and right side bar dehiscence about,after but causes the platform break the economic loss which creates to the company.In order to obtain the YXG500 continuous wall grab work table work process dynamic stress situation,analyzes in the dynamic work process possible hazard point and the destruction load,needs to carry on the dynamic dynamics analysis to the YXG500 continuous wall grab work table,then obtains its various operating modes stress value,then forms the analysis the load spectrum.In the continuous wall grab work process arm receives pulling force.In the grab movement process,the grab promotes from the base to the victory adsorptive attraction in front of the prm support stress,the victory adsorptive attraction operating mode,the unloading operating mode,the grab to dive to the stable operating mode.Above operating mode unceasing shuttle service,the grab is extremely easy to have the fatigue damage.According to reaches the court attendant Bell principle,regarding in time t which assigns willfully the grab movement damage carries on the analysis.Uses the finite element analysis grab each movement operating mode.Through transient state dynamics result and statics analysis preliminary judgment most dangerous region position position,but this position has the welded joint distribution,therefore needs to use the nominal stress law welding fatigue analysis after the improvement main turnplate fatigue analysis.In order to obtain the relatively accurate nominal stress to use the hexahedron unit in this region to establish the sub-model,and has carried on the sub-model transient state dynamics computation,obtains the node the stress course to use in the following fatigue analysis.Draws following conclusion:1,The forecast hot spot position and the actual break destroys the position to be same.2,Uses the stress law forecast life is 3 months,should the political reform forecast life be 1 month,is close with the actual fatigue life.3,Should the political reform result carry on the contrast through the counter stress law to be possible to know,should the political reform fatigue life computation be conservative.All simulation analysis does not have the real gantry endurance test contrast confirmation,the postscript to need further to develop the welded joint,the attachment and the material correlation endurance test,and will carry on the appraisal using the actual load spectrum to cause the life forecast to be more real reliably.