Device and method for testing circumferential tensile strength of thin-wall pipe material

Abstract

The invention discloses a device and method for testing circumferential tensile strength of a thin-wall pipe material. The device comprises a disk-shaped clamping fixture, two connecting pieces and fixing pins which are used for fixing the clamping fixture and the connecting pieces; the clamping fixture is partitioned into two semicircular sheets of unequal sizes, and a fixing hole is formed in each semicircular sheet; each connecting piece consists of a connecting handle and an n-shaped adapter; the connecting handles are fixed to centers of crossbeams of the adapters; pin holes are formed in both sidewalls of each adapter. The method comprises the steps: (i) measuring dimensions of the thin-wall pipe material; (ii) mounting the device; (iii) testing the circumferential tensile strength; (iv) calculating the circumferential tensile strength. According to the device and the method, the tensile strength of the thin-wall pipe material can be tested under nondestructive conditions, sample defects resulted from a sample bending process are avoided, and the circumferential tensile strength of thin-wall metallic pipe materials can be tested accurately and directly.

Description

technical field [0001] The invention belongs to a tensile strength testing device, in particular to a device and a testing method for testing the hoop tensile strength of thin-walled pipes. Background technique [0002] As the main structural part, the small-diameter thin-walled metal cylinder is subjected to hoop stress. Only the hoop tensile strength can truly reflect the real stress situation. [0003] At present, there is no standard for testing the hoop mechanical properties of thin-walled metal cylinders, and self-exploration and research are required. In the past, tensile tests have used bent specimens. During the loading process, due to the bending distance The generation of additional stress brought in, which seriously affected the accuracy of the test data, and also led to the inability to accurately judge the law between the production process and the mechanical properties. Therefore, it is necessary to design a special small-diameter thin-walled metal cylinder ci...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no standard for testing the hoop mechanical properties of thin-walled metal cylinders, and self-exploration and research are required. In the past, tensile tests have used bent specimens. During the loading process, due to the bending distance The generation of additional stress brought in, which seriously affected the accuracy of the test data, and also led to the inability to accurately judge the law between the production process and the mechanical properties. Therefore, it is necessary to design a special small-diameter thin-walled metal cylinder circumferential Experimental setup for tensile strength testing

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