Aluminum alloy guide line monofilament axial stress fatigue test clamps and clamping method thereof

Abstract

The invention discloses an aluminum alloy guide line monofilament axial stress fatigue test clamps and a clamping method thereof, and belongs to the technical field of high cycle fatigue tests of an aluminum alloy guide line monofilament. A total of two groups of the clamps is provided; each group of clamps is composed of two single-sheet clamps, and the thickness of the single-sheet clamps is 2-5 times of the diameter of a guide line monofilament; each single-sheet clamp is provided with a semi-cylindrical groove; the surface of the semi-cylindrical groove of each clamp and a clamping end of a to-be-tested aluminum alloy monofilament are respectively subjected to shot blasting treatment; during clamping, the clamping end of the guide line monofilament is inserted into the semi-cylindrical grooves of the clamps, then the two groups of the clamps are clamped into a fatigue machine in a upper-and-lower symmetry manner, and the upper part and the lower part of the aluminum alloy guide line monofilament are guaranteed to be parallel to the loading axis direction; fatigue test parameters are set, and a fatigue test is carried out. With adopting of the clamps and the clamping method thereof, the fatigue life test precision of the aluminum alloy guide line monofilament is improved to a greater extent.

Description

technical field [0001] The invention relates to the technical field of high-cycle fatigue test of aluminum alloy wire single wire, in particular to a jig for axial stress fatigue test of aluminum alloy wire single wire and a clamping method thereof. Background technique [0002] About 80% of structural material failure is caused by fatigue, and the same is true for the failure of aluminum alloy wires during use. In recent years, the power grid has used aluminum alloy energy-saving conductors on a large scale. During the service process of aluminum alloy conductors, cases of fatigue fracture failures of aluminum alloy overhead conductors affected by wind loads have often been reported. Therefore, research on the fatigue life of aluminum alloy wires has become a top priority in the current application process of aluminum alloy wires. However, for the high cycle fatigue test of aluminum alloy wire monofilament, since the diameter of aluminum alloy wire monofilament is generall...

AI Technical Summary

Problems solved by technology

However, for the high cycle fatigue test of aluminum alloy wire monofilament, since the diameter of aluminum alloy wire monofilament is generally less than 4mm, it is difficult to process it into a traditional fatigue sample, and in fact it cannot implement the existing fatigue test standard. As a result, during the fatigue life test of the aluminum alloy wire monofilament, the fracture position of the sample often appears at the clamping end

In order to test the fatigue life of aluminum alloy wire monofilament and study the fatigue cracking mechanism of aluminum alloy wire monofilament, it is necessary to machine the wire, which will not only have a certain impact on the structure and state of the aluminum alloy monofilament sample during the processing And it may change the surface state of the wire material, which makes the test results unable to truly reflect the fatigue life of the aluminum alloy wire monofilament

If the aluminum alloy wire is not machined and the existing fixture is directly used for the clamping test, the fixture will cause damage to the clamping part of the wire, and the fatigue life of the material is very sensitive to material defects. Improper clamping will lead to fatigue test results There is a large error, which cannot accurately reflect the life of the aluminum alloy wire monofilament, resulting in inaccurate experimental results

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