Direct measurement of torsional properties of single fibers

This dataset is related to our paper "Dabiao Liu, Kai Peng, and Yuming He*. Direct Measurement of Torsional Properties of Single Fibers. Measurement Science and Technology, 27 (2016), 115017.". In this work, 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 torsional rigidity. The torsional 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 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 torsional properties of these samples, such as yielding shear strength, were obtained.

本数据集关联于论文《Dabiao Liu、Kai Peng、Yuming He*. 单纤维扭转特性的直接测量》，刊载于《测量科学与技术》(Measurement Science and Technology) 2016年第27卷，文章编号115017。本研究基于扭摆天平(torsion balance)原理搭建了一套直接测试技术：该技术对试样施加扭转力矩，将该力矩与已知扭转刚度的扭丝产生的反力矩相平衡；扭丝的扭转刚度通过扭摆(torsion pendulum)测定。为测量扭丝的转角，本研究开发了一种高灵敏度角度检测装置，该装置由连接于扭丝与纤维试样之间的细十字梁，以及激光位移传感器(laser displacement sensor)组成。所提出的测试技术可在合理分辨率下测量低至10^-9 N·m的单纤维扭矩。利用该技术，研究人员对微直径铜线、银线及碳纤维开展了扭转测试，获取了这些试样的纵向剪切模量(longitudinal shear modulus)、屈服剪切强度(yielding shear strength)等扭转特性参数。