Extension measuring device after fracture of sample

Abstract

The invention relates to an extension measuring device after fracture of a sample. The device comprises a body, wherein the body is provided with a rectangular groove, the groove comprises a front wall, a back wall and a side wall, the groove is provided with a platen which can slide left and right, the front wall is provided with a blind hole, a spring is installed inside the blind hole, and one end of the spring is pressed on the platen. When the device is used, the to-be-inspected sample is put into the rectangular groove with fractures aligned, the spring compacts the platen to enable the fractures of the sample to mesh, a standard spaced line which is labeled on the sample in advance is measured through a digital readout vernier caliper and is compared with the distance between the standard spaced lines of the sample before the test, and the extension length of the sample is obtained. The device has the advantages of being convenient to use by using the spring to add stress, ensuring the consistent stress of every sample and obtaining a relatively consistent testing result.

Description

technical field [0001] The invention relates to the technical field of metal material sample detection, in particular to a device for measuring the elongation of a sample after breaking. Background technique [0002] The elongation of samples in various forms is one of the important indicators for testing the plastic deformation ability of materials. However, after the sample is broken, it often has a canine-shaped structure at the fracture site. The structure is uneven and the fit is not good. When it is manually docked for measurement, there are always some inconsistencies in the middle, which are usually artificial. It feels that according to the combination of the joints, the places that do not match are trimmed, which objectively has uncertain factors. [0003] For conventional detection of elongation after fracture, two fractured samples are usually paired together and measured with a digital display vernier caliper. If the butt connection is not good, the middle is r...

AI Technical Summary

Problems solved by technology

However, after the sample is broken, it often has a canine-shaped structure at the fracture site. The structure is uneven and the fit is not good. When it is manually docked for measurement, there are always some inconsistencies in the middle, which are usually artificial. It feels that according to the combination of the joints, the places that do not match are trimmed, which objectively has uncertain factors

[0003] For conventional detection of elongation after fracture, two fractured samples are usually paired together and measured with a digital display vernier caliper. If the butt connection is not good, the middle is raised, and the two ends of the sample swing left and right, it will inevitably affect the test result; in addition, The shape of the place where the two fractures are joined is different. If no external force is applied, it will be difficult to "bite" together, which objectively increases the width of the butt joint gap.

However, the large error in the elongation measurement of the sample after fracture has a great influence on the performance judgment of the sample.

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