Abstract
An optical strain-measuring device with electrical output compatible with in-line computerized data-reduction capability is described. In operation, an image of the specimen or target is focused at the plane of a Ronchi ruling or grating, and a traveling slit permits light from the target image to excite a photoelectric device. The output signal is a series of pulses proportional in number to the target dimension and counted electronically. Provision is made to split the image light beam to provide for multi-directional strain measurements. The prototype instrument which is described measures orthogonally and has a maximum measurement set rate of 30 scans/sec. Data demonstrating the usefulness of the system are reported and discussed.
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Abbreviations
- Symbol :
-
Case Definition and Units
- Δ x :
-
l.c. Deformation—X direction (in.)
- Δ y :
-
l.c. Deformation—Y direction (in.)
- ε x (epsilon):
-
l.c. Strain—X direction (ratio)
- ε y (epsilon):
-
l.c. Strain—X direction (ratio)
- ν (nu):
-
l.c. Poisson's ratio
References
Briar, H. P., “Computer-Controlled Testing System,” Instrument and Control Systems, 119 (June 1964).
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Surland, C.C., Givan, G.R. An electro-optical scanning system for multiaxial-strain measurements. Experimental Mechanics 5, 19A–24A (1965). https://doi.org/10.1007/BF02327432
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DOI: https://doi.org/10.1007/BF02327432