The Care and Nurturing of Baby Straingagers
Full-fledged straingagers aren’t born; they need to be nurtured by teachers and mentors from their very first laboratory experiment and throughout their careers.
That’s why University of MN engineering student Matthew Lilyquist turned to Micro-Measurements for help with his independent project for his Basic Engineering Measurement laboratory class.
Lilyquist wanted to measure the amount of resultant strain in the sole of a running shoe while the shoe was exposed to forces typical to running. This required a compact strain gage that could be used for high elongation applications, and an adhesive that could bond to the polyurethane sole of the shoe.
The Micro-Measurements engineer he worked with considered the student’s level of expertise and ability to successfully attain reasonably accurate measurements before recommending the C2A-13-250LW-350 pre-wired strain gage and M-Bond 200 adhesive for the student’s laboratory experiment. Although not ideal in a “real world” application, this particular gage was recommended for this particular situation due to its suitability for high elongation applications and also for its pre-attached lead wires that provided ease of installation and avoided potential soldering damage.
The pre-wired gage would be adhered to the shoe sole, in a recess between treads, using the chosen adhesive. Coupled with a compact data acquisition device and a laptop computer, this device could be used to accurately measure the amount of axial strain present to sufficient accuracy.
Lilyquist achieved the results he expected. We hope he aced the class!
Read the full Case Study: Measuring Strain in Running Shoes Under a Typical Running Condition
- C2A-13-250LW-350 strain gage, configured in a quarter bridge
- M-Prep surface preparation
- M-Bond 200 gage adhesive
- M-Coat A polyurethane coating