1970 Volume 16 Issue 3 Pages 100-107
A high-frequency, responsive-force gauge is needed to observe the actual stress-strain curves of filament yarns in an extreme short loading time ranging in ms during high-speed testing.
A standstill indication of the force-gauge must be formed with the D.C out-put, because dead loads are charged to calibrate the gauge with weights.
The force gauge of a yarn-measuring instrument must have temperature stability and zero-level stability.
We have designed and built a high-frequency, responsive-force gauge with which to investigate the mechanical behavior of a filament yarn. The gauge is based on the principle that the frequency of a zero temperature coefficient (A.T Type) quartz crystal resonator of radio frequency shifts under external pressure.
The characteristics of the quartz crystal resonator force gauge show that the frequency response is from D.C to about 6-7KHz and stable both in the initial drift and temperature drift.
Further work is in progress to improve the mechanism of the force gauge so as to obtain a higher response.
