Fixing device for round-bar stretching sample with gap and measurement method for diameter at gap

Abstract

Disclosed is a fixing device for a round-bar stretching sample with a gap. The fixing device includes a base and two tip cones. The base is a cuboid with a groove and the bottom part of the groove is provided with a light hole. The two tip cones are arranged at the two sides of the base respectively and capable of penetrating through the base and moving horizontally. Conical tips of the two tip cones are at the same axis which is above the light hole. Cone parts of the tip cones both face the inner sides of the base. The fixing device is applied to testing of sample manufacturing and capable of ensuring that the diameter at the gap of a manufactured round-bar stretching sample with the gap meets design requirements. The fixing device is applied to sample measurement and capable of measuring diameters at the gap part of the sample before and after a test so that test precision requirements are met and accuracy and reliability of test data are ensured.

Description

technical field [0001] The invention relates to the field of mechanical testing of metal and non-metallic materials, in particular to a fixing device for a tensile sample of a round bar with a notch and a method for measuring the diameter of the notch. Background technique [0002] In the notch tensile test, due to the notch effect, the stress concentration is caused, and the stress size and distribution caused by different notch shapes and sizes are also different. Therefore, this test has high research value, but the details of the notch tensile test are not. See the report, especially the method of processing and the method of measuring the diameter of the notch of the specimen. [0003] The notched tensile test and sample processing are different from ordinary tensile tests and sample processing. In order to ensure the accuracy and reliability of the notched tensile test results, in addition to meeting the general requirements of ordinary tensile test samples, it must al...

AI Technical Summary

Problems solved by technology

When using a vernier caliper to measure, due to the limitation of the thickness of the vernier caliper, the radius of the circular arc notch R c The diameter of specimens smaller than 2mm cannot be measured, so a new test method needs to be invented

[0005] Before the invention of this method, the experimenters tried to use the method of thinning the vernier caliper to measure, but for the sample with a smaller circumferential arc notch radius or the sample of the V-shaped notch, this method still cannot measure, and the vernier caliper is a kind of Measuring instruments, self-modification will reduce the accuracy, so this method is rejected

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