A case study on glass fiber-reinforced coupons in collaboration with IPC.
Electrical strain gauges from HBM are well established all over the world. Different applications such as static material and durability testing of coupons and components rely on the high quality and the wide portfolio of over 2000 different strain gauge types.
Together with IPC, the industrial technical center for plastic and composite innovation in France, an investigation based on testing in compliance with the ISO 527-4 standard was performed to compare strain gauges embedded in the composite material (LI66-10/350) with conventional strain gauges installed on the surface of the test structure (LY21-6/350). The test was performed on glass fiber-reinforced plastic coupons.
Points of Interest
1. Does the integration of the strain gauge into a fiber material have an influence on the test specimen?
2. Do the strain gauges installed on the surface create a different measurement signal than the ones that are integrated?
LI66-10/350 (embedded strain gauge from HBM)
LY21-6/350 (conventional HBM strain gauge)
The coupons were measured under the following test conditions:
The coupons were tested with an uniaxial tensile test until failure at a velocity of 2mm/min and a preload of 50N. The testing conditions were 23°C with 50% relative humidity.
IPC (Centre Technique Industriel de la Plasturgie et des Composites) is the industrial technical center whose expertise is dedicated to plastic and composite innovation in France. Since 2016, the profession has thus new means to support all companies, especially small and medium-sized businesses, whatever the process used, thanks to a contribution instituted to finance R & D, innovation, transfer of technologies and skills.