Cracks in wheel disc
Cracks in wheel disc
(OP)
Could some one tell me the causes for cracks to develop at the ventillation holes of a truck wheel disc. Could this be due to overloading of the wheel. The cracks start at the vent hole and extend towards the weld between the disc and rim.
Thanx in advance.
Thanx in advance.





RE: Cracks in wheel disc
Is this an in-service failure (how old is the wheel)? or is it a rig or durability test failure?
Cheers
Greg Locock
RE: Cracks in wheel disc
Thanks
RE: Cracks in wheel disc
Cheers
Greg Locock
RE: Cracks in wheel disc
Failure within 6 months (50000) of running is not acceptable.
One of the reason for the failure might be overloading of the vehicle.
Punching of the vent holes creates Stress concentration in this region. So a better vent hole shape which brings down the stress levels have to be considered. The process followed to make these vent holes (punching) must be looked. Any problem during this operation has to be rectified.Stress relieving has to be done.
The material specification must also be checked.
The test load you consider should represent the actual loads the vehicle experiences during its operation.
RE: Cracks in wheel disc
RE: Cracks in wheel disc
1. What causes excessive cornering fatigue on the wheels.
2. Details of the CFT test.
3. What are the effects of torsion caused due to sudden acceleration & braking on the wheel.
4. Effects of tire wear & ply pattern on the wheel. We notice that the vehicles are fitted with a mixture of cross & radial ply tires, 10.20 & 11R20 sizes and at various wear levels.
Thanks
RE: Cracks in wheel disc
2)CFT is basically to simulate the condition mentioned at point 1.
3)This mainly causes stresses in the rim /disc joint area. There is a test known as radial fatigue test ( or drum test ) to simulate this.
4) No comments.