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PDM V1.0, Open Access
An axial-torsional extensometer for measuring deformation of a specimen subjected to combined axial-torsional loading conditions. The extensometer includes a first holder plate having a first set ring which includes means for securing it to a specimen at a first axial location. A first pair of guide tubes are attached to the first holder plate and are disposed on opposite sides of the first set ring. A second holder plate has a second set ring rotatably attached to it and includes means for securing the second set ring to a specimen at a second axial location axially spaced from said first axial location. A second pair of guide tubes are attached to the second holder plate and disposed on opposite sides of the second set ring. The second pair of guide tubes are disposed to a telescopically engage the first pair of guide tubes. A pair of linear variable differential transducers are attached to and disposed within the telescopically engaged first and second pairs of guide tubes for measuring the axil deformation of the specimen. A pair of rotary variable differential transducers are attached to the second holder plate and disposed at opposite sides of the second set ring. The rotary variable differential transducers are operably attached to the second set ring and measure the torsional deformation of the specimen. Two or more pairs of linear variable differential transducers are mounted on the first and second set rings to measure diametral strains.