Pin-on-Disk wear testing is a method of characterizing the coefficient of friction, frictional force, and rate of wear between two materials. Multiple configurations are available depending on your goals and objectives. Common specifications include: ASTM G99, ASTM G133 and ASTM F732.
Pin-on-disk wear testing can simulate multiple modes of wear, including: unidirectional, bidirectional, omnidirectional, and quasi-rotational.Mass-loss evaluation and differential analysis of test fluids are typically performed post-test to characterize wear properties. In addition, a contact profilometer can be utilized to evaluate the changes in surface topography due to articulation. Metallurgical evaluation of the post-test wear scarring can also be performed. Testing can also introduce third body debris for accelerated wear evaluations.
Do I need Wear Testing?
Element’s Engaged Experts provide insights into when regulatory bodies will require wear testing and how you should go about fulfilling that requirement.
When is wear testing required?
The FDA and other regulatory bodies will often request mechanical wear testing when the device is introducing a new material couple or new material interactions that have not been adequately characterized through mechanical testing. Wear testing is also critical for comparing the wear properties of new devices to a previous generation device.
Test with Predicates
If you find you need wear testing, Element strongly recommends testing your implants side-by-side with a predicate device, to ensure an “apples-to-apples” comparison for your submission. Element’s wear testing frames are configured for easy side-by-side comparison testing of both your device and a predicate on one single frame, ensuring reliable and repeatable results.
Unique Frames for High-Capacity Testing
Learn more about Element's high capacity, 12 station wear test frames.
Element performs pin-on-disk wear testing in accordance with ASTM G99, ASTM G133 and ASTM F732 on our in-house, 12-station wear test frames. These unique, high capacity machines allow for the testing of several material combinations at a time, on a single test frame. The 12-station setup also allows for additional statistical confidence by testing multiple samples per condition.
Element’s Pin-on-Disk Test Frame Capabilities:
- 1,000 N normal load per station
- 100+ MPa of contact stress
- 2.5 N-m of torque
- Up to 0.25 km per minute of unidirectional motion
- 12 individual, temperature controlled test basins for in-vivo simulation
- 4 temperature controlled load-soak basins for fluid gain/loss correction
Additional Pin-on-Disk Capabilities
Element’s engaged experts have the ability to provide a wide range of specialized testing and analysis for your next pin-on-disk wear testing project.
Third Body Wear Analysis: Element has the ability to perform third body wear analysis as part of a pin-on-disk project. By introducing a third body particulate into the articulation of the test, an accurate simulation of a specific condition can be created (e.g. bone cement in the joint space).
Scratched-Surface Wear Analysis: This test may also be performed by introducing an engineered scratch network on the disk prior to pin-on-disk testing. This specific application is typically used to simulate the effects of complex, prolonged wear when evaluating a hard, metallic coating.
Post-Test Metallurgical Analysis: Upon the conclusion of testing, both pins and disks can be evaluated metallurgically using a stereoscope or high magnification scanning electron microscope (SEM). This allows you to better understand surface conditions and any scarring that may have occurred.
Pin-on-Disk Wear Testing
Engineered Scratch Network
Third Body Wear Analysis
SEM Particle Analysis
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Maciej has over 10 years of experience in medical device testing and analysis for FDA 510(k) and CE submissions.
Kent is the co-founder of Medical Device Testing Services, acquired by Element in 2017. Kent’s expertise in medical device testing has led to the development of new test instruments, standards and protocols.