Components which undergo rolling contact (such as bearings, gears, or cams and tappets) can suffer from rolling contact fatigue or wear. Repeated stress cycles can cause the initiation of fatigue cracks, or micro-slip within the contact resulting in wear taking place. The testing of full size components can often be difficult and expensive. An alternative is to reproduce the rolling contact using a twin disk machine.
The test machine consists of two rollers which are driven by independent electric motors. The motors are controlled such that small levels of sliding can be achieved. The disks are loaded together hydraulically.
A feed system can be used to lubricate the disk contact (usually with mineral oil or water). An environment chamber can be used to provide additional cooling, contamination, or a special environment.
- Maximum rolling speed: 400rpm
- Maximum contact pressure: 1500MPa
- Slide roll ratios: 0.1% to 20%
Some Previous Applications:
- Wear and fatigue in Aluminium SiC MMCs
- Study of the damage caused by railway track sanding
- Electrical isolaton casued by track sanding
- The effect of surface dents on rolling contact fatigue