P2.3 - Strain gauges made of laser patterned hot stamping foil
- AMA Conferences 2015
2015-05-19 - 2015-05-21
- Proceedings SENSOR 2015
- P2 - Mechanical
- J. Hielscher, D. Foik, A. Lyashenko, R. Werthschützky - Technische Universität Darmstadt (Germany)
- 762 - 765
Some applications require strain gauges with individual shape and resistance. We provide a fast and flexible method to create individually shaped low-cost strain gauges by laser patterning of hot stamping foil. The raw material is inexpensive, widely available and comes with a homogenous metallization. By a selective laser patterning process it is possible to create the sensitive metal structures in any individual layout and separate the foil into single pieces in a single operation. We used a conventional hot stamping foil with a gold coating and a fiber laser for the patterning. To investigate the performance, a generic meander layout was designed with a base resistance of 1k Ohm. 32 gauges were fabricated with a standard deviation in resistance of 48 Ohms. Four point bending tests reveal a gauge factor of k = 2.61.