Taking the transmission gear of heavy equipment as the research object, the fatigue crack propagation and fatigue fracture of gear

The model used for the numerical simulation of gear bending fatigue is the same as that used in the bending

When testing the bending fatigue of 42CrMo heavy equipment transmission gear by experimental method, the data results have obvious advantages,

Before the formal bending fatigue test, the load level of the test needs to be determined. Pick two from the

The bending fatigue characteristic curve and bending fatigue limit stress of the test gear shall be combined according to different

The transmission gear of heavy equipment used in the bending fatigue test is designed based on the gear applied in

The test adopts the form of single tooth loading. It is necessary to design special fixtures according to the standard

The stress ratio r = 0.6, the number of cycles n corresponding to the stress intensity factor at the crack

In order to verify the correctness of the above crack propagation, the crack length and crack tip stress intensity factor

The dynamic continuous growth of fatigue crack is realized by resetting the crack length each time. In the numerical simulation

Fig. 1 shows 150, 300, 500 and 1000 times SEM images of fatigue fracture in the instantaneous fracture zone. The

Under the continuous loading of cyclic loading and unloading, the slip band around the crack tip deforms, resulting in the