Direct measurement of torsional properties of single fibers

<p>This dataset is related to our paper &quot;Dabiao Liu, Kai Peng, and Yuming He*. Direct Measurement of Torsional Properties of Single Fibers. Measurement Science and Technology, 27 (2016), 115017.&quot;. In this work,&nbsp;a direct technique is established based on the principle of torsion balance. The technique applies twist to the specimen and balances the resulting torque against a torsion wire of known&nbsp;torsional&nbsp;rigidity. The&nbsp;torsional&nbsp;rigidity of the torsion wire is determined by a torsion pendulum. To measure the rotation of the torsion wire, a sensitive angle detector, comprising a thin cross-beam attached between the torsion wire and the fiber specimen and a laser displacement sensor, is developed. The presented technique permits the measurement of torque in single fibers as low as 10^-9&nbsp;Nm with a reasonable resolution. Using this technique, torsion tests on micro-diameter copper wires, silver wires and carbon fibers were performed. The longitudinal shear modulus and other&nbsp;torsional&nbsp;properties of these samples, such as yielding shear&nbsp;strength, were obtained.</p>