Abstract
The determination of deformations by measuring the consequent change in the natural frequency of transverse vibration of a tensioned wire is well known in principle. Sophisticated gages making use of this method are commercially available but the application of the technique to field measurements involves the solving of certain practical difficulties. The development and use of a simple type of vibrating-wire strain gage, together with the necessary ancillary equipment, is described.
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Abbreviations
- A :
-
Cross-sectional area of the vibrating wire
- E :
-
Young's modulus of the wire material
- L :
-
Length of the vibrating wire
- m :
-
Mass per unit length of the wire
- N :
-
Fundamental frequency of vibration of the wire
- P :
-
Tensioning force in the wire
- δL :
-
Increment in length of the vibrating wire
Bibliography
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“An Acoustic Process for the Measurement of Stress”, The Engineer, London, 158, 4100, Aug. 10, 1934.
Davidenkoff, N, “The Vibrating Wire method of Measuring Deformation”,Proceding ASTM, vol.34, pt. 2, 847–860 (1934).
Mainstone, R. J., “Vibrating-Wire Strain Gauges for Use in Long Term Tests on Structure”,Engineering, London, 176, 4566, July 31, 1953.
Chapman, J. C., “Stud-Welded Vibrating Wire Strain Gauges”,The Engineer, London, 206–5361, Oct. 24, 1958.
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Shepherd, R. Strain measurement using vibrating-wire gages. Experimental Mechanics 4, 244–248 (1964). https://doi.org/10.1007/BF02322958
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DOI: https://doi.org/10.1007/BF02322958