It can be assumed that the test bearing inner ring in the circumferential direction of the tensile stress is too large, local stress concentration at the corner R edges, eventually bearing fracture
It can be assumed that the inner ring pulls the pressure in the direction of the circumference during the test, which will cause the local stress to concentrate at the edge of the R angle, and the final bearing will break.
It can be assumed that when the bearing is tested, the tensile stress of the inner ring along the circumference is too large, which will make the local stress concentrate at the edge of the R angle, and finally the bearing will break