An axial-torsional extensometer has been designed, constructed and tested. This extensometer is suitable for use in the experimental determination of multiaxial plastic deformation and determination of fatigue fracture under moderately large strain range. The extensometer is applicable to tubular or solid cylindrical specimens, with enlarged ends, and measures the axial and shear deformations within a gage section of the specimen. It has been calibrated, and error bounds are given in terms of linearity, crosstalk, and hysteresis. The diametral strain can also be measured, which is especially useful in the testing of materials with voids. An application has been made to combined axial-torsional loading of a metal tubular specimen. Test results are presented.

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