Scientific

Figure 1 is the contact pressure diagram of the gear in the process of meshing, and the pressure distribution of

The results of the overall equivalent stress of the gear are shown in Figure 1. The variation law of dynamic

The macro morphology of fatigue fracture of low speed and heavy load gear teeth can be divided into three obvious

Since the test data under each stress level obey the lognormal distribution, when the normal probability density function is known,

The number of fatigue cycles under four stress levels is counted in the order from small to large, and the

Before calculating the tooth root stress of the gear, it is necessary to find the exact position of the load

Before carrying out bending fatigue strength, the primary task is the design and manufacture of gear specimens. Because the object

In order to study the problem of fatigue crack propagation and fatigue life of low-speed and heavy-duty gear, a low-speed

For the statistical analysis of this section, the relevant data of stress ratio r = 0.6 is also used. The

In order to verify the accuracy of the fatigue crack growth test of the compact tensile specimen, the data of

The theoretical Mises stress nephogram distribution law of the numerical simulation model of compact tensile specimen under macro state is

The model used for numerical simulation of fatigue crack growth is the same as that of 42CrMo steel compact tensile

With the continuous progress of the test, under the action of cyclic load, cracks appear on the sample and continue

The fatigue crack growth rate DA / D N and the stress intensity factor at the crack tip under different

The data of crack tip stress intensity factor (SIF) and crack length under different stress ratios collected through the test

The fatigue crack growth test of compact tensile specimen was carried out according to the national standard GB / T

The fatigue crack growth test was carried out in the State Key Laboratory of new metal materials, University of science

42CrMo steel is a kind of ultra-high strength steel, which has strong resistance to plastic deformation, less possibility of brittle

The existence of the worst speed in the boundary lubricated gears has not been discussed in the literature. There is

It is known from the test results that for the low-speed and heavy-duty lubricated gears with circumferential velocity v =

The tests were carried out on the modified CL-100 gear testing machine. The schematic diagram of the testing machine is

1.Technical Requirements 20grni2moa steel material, module M = 6, number of teeth z = 38, width of teeth H =