A kind of torsion testing machine in new design was introduced. The sample was fixed using hydraulic rotating clamps. The constant tensioning force could be applied to the long wire type sample by servo motor- ball screw-sensor. The clamps could be bidirectionally rotated via the driving and controlling with servo motor-reducing mechanism. Therefore, several kinds of torsion test and low-cost low-speed tension-torsion fatigue test for the long wire steel samples ([?]7 mm-[?]14 mm, 2 000 MPa) could be fulfilled upon the machine. By monitoring the change of torque in real time, the machine had the state-of-the-art capability of rotating with controllable and changeable speed from 0.000 5 to 30 r/min as well as the instantaneous critical sampling when the torque decreased suddenly (i.e., max torsional plasticity). Hence, the internal structure and external surface morphology of sample could be analyzed subsequently.
Key words
torsion test, torque, high-strength wire, steel wire rod
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References
[1] GB/T 10128-2007 《金属材料 室温扭转试验方法》[S]
[2] GB/T 239.1-2012 《金属材料 线材 第1部分:单向扭转试验方法》[S]
[3] GB/T 17101-2008 《桥梁缆索用热镀锌钢丝》[S]
[4] 崔发明. 高碳钢丝扭转断裂原因分析[J]. 金属制品, 2007,33(3): 39-41.
[5] 桂江兵, 夏艳花, 鲁修宇, 周勇, 吴超. 镀锌钢丝扭转试验异常断口分析[J]. 武汉工程职业技术学院学报, 2014, 26(3): 34-37.
[6] 仇东丽,夏艳花,帅习元,周勇,鲁修宇. 制绳钢丝扭转试验断口分析[J]. 武钢技术,2015,53(4): 27-29.
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Footnotes
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