钢丝绳拉伸损伤的微电阻表征法

Micro Resistance Characterization of Tensile Damage of Steel Wire Rope

对电流反向的微电阻四线测试技术进行了研究,并用6×19+FC钢丝绳做拉伸实验,研究钢丝绳载荷和微电阻值之间的关系。研究发现,钢丝绳在拉伸过程中经历弹性阶段和塑性阶段;在钢丝绳拉伸的全过程中,钢丝绳拉伸状态和微电阻的变化规律具有很好的相关性,其中在弹性阶段,钢丝绳的电阻增量相对塑性阶段的电阻增量变化较小,为11μΩ/500N左右;塑性阶段中,电阻增量变化非常明显,范围为12μΩ/500N-70μΩ/500N左右,此阶段钢丝绳损伤严重,甚至出现断丝现象。通过使用微电阻参量能很好地表征钢丝绳的拉伸损伤状态。

This paper studies micro resistance testing technology of the 4-line current reversal,uses 6×19+FC wire rope to do tensile test and studies wire rope's relationship between the load and micro-resistance. The study found that the wire rope through elastic stage and plastic stage during stretching. In the whole process of stretching the wire rope, the rope tensile state and micro-resistance variation has a good correlation. In the elastic stage, incremental resistance change is small relative to plastic stage and its range of values is about 11μΩ/500N;In plastic stage, incremental resistance change is obvious and its range of values is about (12-70)μΩ/500N. At this stage, the wire rope damage is serious and even broken wire phenomenon. It can be well characterized the rope tensile damage by the use of resistance parameters.