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AR Blog Archives
Using Acoustic Emission (AE) During Wear Testing
During Tribometer wear testing, the constant rubbing process of the counterface against the test sample creates a series of events, such as deformation, cracking, abrasion, phase transformation and material removal. These rapid stress-releasing events are the sources of AE. A quantifiable and reliable measurement of AE can provide more insight in the wear failure mechanism. Learn more in this months application note.
High Speed Nano Wear Testing Breakthrough
Feb 20, 2013 – Irvine, CA – Nanovea announced today the completion of a Nano Wear Testing System capable of speeds as high as 1400mm/sec. The unique length of stroke, up to 10mm, combined with a linear movement at a rate up to 70Hz, and possibly at higher frequencies, allows speeds never before available for Nano Wear Testing.
Wear testing instruments have existed for more than half a century. From the beginning, testing loads were typically higher than 1N and speeds were slow except in more recent fretting applications where displacement would be limited to 10’s of microns. Then Nanoindentation first appeared in the late 80’s with the capability to provide much lower loads. The first systems were, and still are in majority, based on a coil system with no feedback control loop. Feedback control loop is essential to provide superior load control when the position of contact is moved such as that required for scratch or wear testing. Nano Scratch Testing with piezo load cell combination appeared in the late 90’s. The first systems used cantilever technologies that gave sufficient speed to the feedback control during scratch and wear testing but the speed of displacement was, and still is limited to below 10mm/sec. For many applications the service life require a very high number of cycles to ensure that the device will hold up after years of use. At the slow speed available with cantilever technologies it could take more than 6 months to accomplish a single wear test. This is impractical and clearly slows down development and approval of new technology.
Nanovea is able to attain faster speeds and secure control of the loads during Nano Wear Testing by using a coil speaker system for quick and smooth displacement. Adding the use of the Nanovea Nano Module with a piezo actuator and an ultra-sensitive load cell creates a quick load control with vertical mounting to ensure superior response to speed.
“We were given the opportunity to really prove our team’s capability here with this project. We are very proud of this achievement. This new technology will speed up the introduction of new devices with increased service life to the customer market.” –CEO, Pierre Leroux
