Simulation And Analysis Of Fatigue Damage Of 6207 Deep Groove Ball Bearing Based On Embedded Cell Model

Bearings are indispensable components in modern machinery,which are widely used in machinery,transportation and other fields.Fatigue failure is the common problem of bearings.And bearing failure due to subsurface fatigue accounts for approximately 8%of the total bearing fatigue failure.However,material properties are closely related to microstructure of material.Maximum shear stress of alternating a direction parallel to the rolling is the determining factor leading to the fatigue crack.And in this research,the embedded cell model is developed to study the subsurface fatigue damage of bearing roller under the action of orthogonal shear stress,based on the viewpoint and method of the meso-mechanics.Embedded cell models with different matrix shapes are established based on the microstructure of GCr15 bearing steel material,which is used to make 6207 deep groove ball rollers.And Abaqus is used to simulate the statics and dynamics of the model under strain loading.From the simulation results,we can draw several conclusions:the interfaces between carbide particles and martensite-matrix in the material are the weak taches of the material;the maximum equivalent plastic strain occurs in the parts of the matrix where the martensite-matrix contacts the carbide particles;larger deformation zones in the martensite-matrix appear in the direction which is at an angle of ±45° from the shear strain loading direction;in the case that the size and volume fraction of carbide particles are constant,the larger the distance between adjacent carbide particles distributed along the shear strain loading direction and vertical direction is,the greater the maximum plastic strain of the the martensite-matrix is;as the carbide particle size in the model increases with the certain volume fraction and shape of the carbide particles,the maximum plastic strain of the martensite-matrix decreases.The fatigue life of different embedded cell models is calculated by Fe-safe.We reached the consistent results:the earliest fatigue occurs in the parts of the matrix where the martensite-matrix contacts the carbide particles;larger fatigue zones in the martensite-matrix appear in the direction which is at an angle of±45° from the shear stress loading direction;as the distance between adjacent carbide particles distributed along the shear stress loading direction and vertical direction increases in the case that the size and volume fraction of carbide particles are constant,the fatigue life of the the martensite-matrix increases;and as the carbide particle size in the model increases with the certain volume fraction and shape of the carbide particles,the fatigue life of the martensite-matrix decreases.