Do you know the features and character of fatigue flake mechanism of excavator bucket?

If the surface of the needed excavate rocks and stones is full of shear deformation, but under the influence of shear deformation change layer, professional excavator bucket pins and bushings production supplier said the surface shear deformation would forming into fatigue flake, which looks like the platy and thin piece shape, but its edge part has the roughness touch feelings.

Professional excavator bucket pins and bushings production supplier said another main reason lead to fatigue flake phenomenon is due to the advance and return effects between the excavator bucket and rocks, the entirety excavator bucket would face to plasticity deformation changes, but lead to high enough harden manufacturing effects, so professional excavator bucket pins and bushings production supplier said the teeth surface brittleness for excavator bucket is larger than usual,so when rocks suffer the strong impact force, professional excavator bucket pins and bushings production supplier said the excavator bucket teeth surface would appear the brittleness fatigue flake, so just looks at the surface of finished excavator bucket, which would full of redial type cracks maintain the different depth and length.