A deformation measuring device for a boss-free metal material high-temperature tensile test

Abstract

The invention relates to a deformation measuring device for a boss-free metal material high-temperature tensile test, comprising a spring, an upper scissor type device, a lower scissor type device, an upper clamp, a lower clamp, extension rods, deformation sensors, and a high-temperature furnace, wherein both the upper clamp and the lower clamp are arranged in the high-temperature furnace, the upper part of the upper clamp is provided with the upper scissor type device while the lower part of the upper clamp is fixed to the extension rods, and the upper part of the lower clamp is provided with the low scissor type device while the lower part of the lower clamp is fixed to the extension rods; the top ends of both the upper scissor type device and the lower scissor type device are connected with the spring and reaches out of the upper opening of the high-temperature furnace, making sure the upper clamp and the lower clamp firmly clamp a sample with force applied by the spring; the lower ends of the extension rods reaches out reach out of the lower opening of the high-temperature furnace and respectively connects with the two deformation sensors on the two symmetrical sides of the sample, thereby forming a two-side measuring system to measure the deformation value of the sample. Compared with the prior art, the device can measure the deformation value within a gauge length during the high-temperature tensile test of not only an ordinary boss-free metal material sample such as wires, bars, and pipes, and the like, but also a multi-strand special boss-free metal material sample such as steel tendons and the like.

Description

technical field [0001] The invention relates to the field of high-temperature tensile mechanical performance testing of metal materials, and is a technology for measuring the deformation within the gauge length when conducting high-temperature tensile tests on metal material samples without bosses such as wires, rods, pipes, and steel wire bundles. device. Background technique [0002] At present, when conducting high-temperature tensile tests on metal material samples without bosses (such as wires, rods, pipes, etc.) at home and abroad, when using a more accurate method to measure the deformation within the gauge length, the devices used are mostly side-inserted extensions. count. This kind of extensometer can only realize unilateral measurement of sample deformation, so that the sample deformation measurement is greatly affected by the load eccentricity caused by the different axis of the testing machine, and the measurement accuracy is not high enough; its measuring rang...

AI Technical Summary

Problems solved by technology

This kind of extensometer can only realize unilateral measurement of the deformation of the sample, so that the measurement of the deformation of the sample is greatly affected by the load eccentricity caused by the different axis of the testing machine, and the measurement accuracy is not high enough; its measuring range is limited, and the gauge length is less than 50mm ; Because most of them are imported products, the price is expensive

In addition, this kind of extensometer is mainly suitable for a single sample. For special multi-strand metal material samples without bosses such as steel strands and steel wire bundles, it can only measure the high-temperature deformation of the outer steel wires, but cannot measure The amount of deformation of the entire sample, so it is difficult to apply

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