High frequency pulsator
Vibrophores one uses, the fatigue strength of materials and components in the time and fatigue strength range, for example in the fatigue test according to DIN 50100 ( N curve ) to determine the tensile, compressive and AC load range. A special design of the high-frequency pulsator is the so-called vibrophore .
field of use
Typical areas of application are fracture mechanical investigations on CT and SEB samples, oscillation of samples, fatigue and endurance tests on components (e.g. screws and springs) as well as the production and quality control of components that are dynamically loaded during their service life.
Working method
As with a static tensile testing machine, the controlled mean force is applied to the test specimen using the upper crossbeam. A separately regulated electromagnetic drive applies the dynamic load to the test item. The high-frequency pulsator is operated in resonance frequency . Due to the fact that the oscillating circuit itself is superelevated, a large force and displacement amplitude is achieved with little energy input; it is only about 2% of the energy requirement of servo-hydraulic testing machines. The test frequencies can be up to 300 Hz, the test forces up to 1000 kN. be. In contrast to servohydraulic testing machines, high-frequency pulsators are very easy to install, as no additional units for hydraulics, compressed air or water are required. Due to the electro-magnetic drive, the systems are considered to be wear-free and are characterized by lower noise emissions than comparable unbalance systems.
Web links
- Description of the application: Fatigue strength test at the University of Magdeburg
- Application example, Tuev, Nord: Dynamic testing of reinforcing steel
Individual evidence
- ↑ Zwick presents the world's most powerful high-frequency pulsator - press release . Website Zwick GmbH & Co. KG. Retrieved May 8, 2013.