Clamp used for pipe fitting impact test

Abstract

The invention discloses clamp used for pipe fitting impact test. The clamp comprises a discoid pedestal, a positioning boss is arranged at the central section of the lower surface of the pedestal, several spacing bosses with circular array assignment are arranged at the upper surface of the pedestal, the inner side surface of the spacing boss is an arc surface, the clamp also comprises a rotation plate placed on the upper surface of the pedestal and is concentric with the pedestal, the outer peripheral face of the rotation plate is connected with the inner side surface of the spacing boss in a sliding fit mode, a gland supporting the upper end of the spacing boss is arranged, the gland is in a circular state, several clamping blocks with circular array assignment at the lower part of the gland and capable of sliding along the radial direction are arranged, a helical structure capable of forming a helical pair by cooperation is arranged on the lower surface of the clamping block and the upper surface of the rotation plate, and several jacks are arranged on the outer peripheral face of the rotation plate in an interval mode along the circumferential direction. The clamp is capable of clamping a test piece, inclination unstability due to test condition and error influence of the test piece during a bruising process can be prevented, and the test success rate and the research efficiency are increased.

Description

technical field [0001] The invention relates to a fixture, in particular to a fixture for impact testing of pipe fittings. Background technique [0002] Thin-walled tubular structures have important applications in the energy-absorbing fields of automotive energy-absorbing boxes and other materials. Through impact tests on them, the energy-absorbing characteristics and deformation modes of different structures can be obtained, which is helpful for the development of crashworthiness of different thin-walled tubular structures. The research has important guiding and verification significance. Measuring the mechanical properties of thin-walled pipe fittings with different structures by impact test is an important method to evaluate the crashworthiness of such pipe fittings. The usual way to carry out this type of test is to place the test pipe vertically on the base of the compression platform, make it rise or fall and collide with the other end of the platform to crush it, an...

AI Technical Summary

Problems solved by technology

The compression test platform used by most testing machines is an ordinary flat platform. The disadvantage of this test method is that it cannot simulate the real working conditions, that is, the base of the compression platform is in a free and unconstrained state.

In addition, when some pipes with a relatively large length-to-diameter ratio are tested, they are prone to tilting, instability and bending, so that the true mechanical properties of the structure and materials cannot be obtained.

These test design defects caused by imperfect test equipment conditions seriously affect the research on the mechanical properties of such pipe fittings

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