Conclusions
The results of this work have shown that a three-dimensional strain rosette may be constructed and used to determine principal-strain magnitudes and directions at interior points in homogeneous isotropic solids. To the authors’ knowledge, this is the first time electrical-resistance strain gages have been used to accomplish this. Improvements in technique will surely improve the accuracy of this method. In this first attempt, the accuracy with which principal strains can be established is not as good as in surfacestrain studies.
It is believed that this new strain-gage technique should find applications in solving problems in solid mechanics which could not be approached using other experimental methods. An example would be a problem in three dimensions involving time-dependent strains.
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References
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Baker, W.E., Dove, R.C. Construction and evaluation of a three-dimensional strain rosette. Experimental Mechanics 3, 201–206 (1963). https://doi.org/10.1007/BF02325763
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DOI: https://doi.org/10.1007/BF02325763