| The crankshaft is the highest cost part in reciprocating piston internal combustion engine.It withstands both bending and torsion in working, thus resulting in fatigue stress state, andthe most common causes of damage is bending fatigue damage. The crankshaft fatigue lifesignificantly influences the life of the internal combustion engine, thus it is quite necessary tostudy the analysis of the crankshaft fatigue life.The article took a bending fatigue specimen as the first research object, and simulated themoment loading process of the electric resonant bending fatigue testing machine with finiteelement numerical simulation analysis. Loading moment in the master node of the rigid planewas considered the relative most ideal loading method by comparing the stress calculationresults of3schemes.The article took a crankshaft of a certain4112diesel engine as the second research objectestablished5finite element models of different element length, and loaded static bendingmoment. By comparison with experimental data, the closest finite element model to the actualexperimental conditions was confirmed.On the basis, finite element transient dynamics calculation of was executed with the13key points of the resonant bending fatigue test sine loading curve, and transient stress ofcrankshaft was obtain. The crankshaft fatigue life was calculated in the fatigue life analysissoftware nCode DesignLife, after the finite element calculation results imported into thesoftware, and the corresponding material fatigue performance parameters, load history and thediffirent stress combination method are set. By comparing the error of the results of thediffirent stress combination method and the experimental data, VonMises equivalent stressmethod falls in an order of magnitude, and they are106, and the fatigue life error factor fallsin the range of1.5. |
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