Strain gague selection for large strain measurement
Ordinary metal has an elastic limit (strain limit), and F series strain gauges for general use are used for measuring strain in this range. For measurement of strain in the range beyond the elastic limit until the material breaks, YEF/YF/YHF series post-yield strain gauges (large-strain gauges) are used.
Post-yield gauges according to measuring objects
Metal/Elongation 10 to 15 %
- YEF series post-yield strain gauges
Cyclic measurement in the elastic strain (1500 x 10-6 strain) is possible, but cyclic measurement of large strain is not available.
Metal/Elongation 15 to 20 %
- YF series post-yield strain gauges
Cyclic measurement of post-yield strain or large strain is not available.
Metal/Elongation 30 to 40 %
- YHF series post-yield strain gauges
Cyclic measurement of strain in the elastic range or of large strain is not available.
About adhesive
In case of long time lapse (several days) after bonding, CN-Y adhesive is recommended. Bonding with the CN-Y makes 1-year later large strain measurement possible. (The specimen shoud be stored in room.) On the contrary, measurement just or several hours after bonding is possible with CN adhesive.
