RMS Foundation
Bischmattstrasse 12
2544 Bettlach
Switzerland
Phone +41 32 644 2000
METHODS
Pin-on-disc wear tests
The tribological behavior of two gliding partners is investigated by pressing a pin against a disc and simultaneously moving it horizontally. Both sliding partners are usually in liquid, which is held back by a Plexiglas cylinder and whose temperature is regulated by a thermostat. The load and movement patterns are programmable in order to simulate the wear of surfaces under controlled conditions. The abrasion is determined gravimetrically and/or optically by means of profilometry.
According to which standards do we test?
Whenever possible, we carry out our testing services in accordance with or based on these international standards:
- ASTM F732
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Which devices do we use?
- 2 OrthoPOD pin-on-disc test devices from Advanced Mechanical Technology Inc. (AMTI)
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For which material tests do we use this method?
We use pin-on-disc wear tests for the following material tests, among others:
- Screening of bearing couples for artificial joint replacement (orthopaedic applications)
- Example: Polished CoCr discs vs. UHMWPE pins in simulated sinovial fluid
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What you should know about this method?
What needs to be considered with this method with regard to the samples?
Suitable specimens: Hard gliding partner (metal or ceramic disc), soft gliding partner (polymer or cartilage pin)
Specimen specifications: Disc diameter up to 43 mm (plane-parallel), pin diameter up to 9.5 mm (15‑20 mm long)
Measuring range/options: Vertical force up to 400 N, speed up to 160 mm/s. Fluid temperature up to 50 °C.Which products can be tested at the RMS?
We test all possible material pairings in different liquids. Contact us and we will discuss your individual problem.
Are all tests carried out by RMS?
This wear test is carried out by RMS and can be supplemented with other RMS analysis techniques (e.g. determination of friction coefficients with the rotation tribometer or surface topography).
Are the RMS analyses accredited?
RMS is an ISO/IEC 17025 accredited analytical laboratory (accreditation type C). The wear test according to ASTM F732 is validated and accredited.
Who is your contact person?
Thomas Imwinkelried
Dr. sc. EPFL, Certified Materials Engineer EPFL
Senior Scientist
+41 32 644 2018