Particle Impact Tests
These test benches generate wear through impact of particles. For both test benches, we can use a specimen holder that can preload the specimen to create tensile stresses on the exposed surface.
Applications
If you are not sure if these are the right tests for your tribological problem click here: which test bench?
High Pressure Erosion Test
The high pressure liquid erosion test can be carried out with or without additional solid particles. It combines the impact erosion test (ASTM G73) with the particle blowing test (ASTM G 76).
Standard: ASTM G73, ASTM G76
Specimen geometry: 40x40x4 mm (standard) / 140x40x4 mm (preloaded)
Media impact speed: Up to 250 m/sec
Impact angle: Ca. 15-90°
Liquid pressure: Up to 250 bar
Results: This test simulates very hard erosive load conditions. Loads of this type are capable of triggering deformation or hardening, depending on the material. The test thus simulates complex damage patterns, which can occur e.g. in water turbines or in mining.
Note: The given parameters are according to ASTM Standard. Others on request.
Dry Particle Impact
This test bench was built to blast relatively soft and big particles in different angles to sample surfaces. It is able to simulate effects of total different materials, e.g. rubbers and ceramics, not only on wear of the material, but also on the product itself.
Standard: LOM standard
Specimen geometry: Variable (standard) / 140x40x4 mm (preloaded)
Media impact speed: Depending on particle type, up to 100 m/sec
Impact angle: Ca. 15-90°
Expamples for particles: Durum wheat, maize, nut shells
Particle size: Up to mm-range
Air pressure: Up to 10 bar
Results: Volume loss, damage pattern
Option: Sample-rotation
The test was originally built for applications in food industry. We have verified the reproducibility and the parameter set-up in our internal tests. We used it to study the interactions of different materials with the blasted product.
Due to the fully variable impact angle, different applications can be simulated. Because the product used remains in the test bench, it can be characterised by further analyses after the test. E.g. with regard to grain size, grain fractures, type of contamination.
