A pulse force loading device and method suitable for uniaxial tensile test of metal pipe fittings

Abstract

A pulse force loading device and method suitable for unidirectional tensile tests on metal pipe fittings, a first ring-shaped yoke located at the upper end of the metal pipe to be tested, and a second ring-shaped yoke located at the lower end of the metal pipe to be tested; the first 1. The cross-section of the two-ring yoke is a rectangular frame with a gap. The cavity of the ring-shaped yoke is provided with a constant magnetic field coil. The constant magnetic field coil is used to generate a radial constant magnetic field at the end of the metal pipe to be tested. . The cavity of the ring-shaped yoke is provided with a pulsed magnetic field coil, which is used to generate an induced eddy current at the end of the metal pipe to be tested; the pulsed magnetic field coil is provided with an axial through groove, and the position of the through groove is the same as that of the ring shape. The clearance of the yoke corresponds. The invention can provide a uniform unidirectional tensile electromagnetic force for the metal pipe to be tested; because there is no clamping point, there is no stress concentration phenomenon at the clamping point; at the same time, by changing the pulse width of the electromagnetic force, the loading of different strain rates can be realized .

Description

Technical field [0001] The invention belongs to the field of metal material test, and in particular, the present invention relates to a pulse force loading apparatus and method suitable for use in a one-way tensile test of metal tubular members, mainly for two-way tensile test of metal plate members. Background technique [0002] One-way tensile test results of metal fittings can not only optimize product design, but also for detection of product quality. In the unidirectional tensile test of the existing metal fittings, the loading of mechanical force is used, and there is a problem: the mechanical clamping of the stress is in the presence of the stress, which will affect the unidirectional tensile test results; slow load speed, belongs to quasi-static loading, unmovable simulation One-way stretching material attribute at strain rate. [0003] China Patent "A large-sized metal pipe tension (CN 106424176 A)" discloses a large-sized metal tube stretching method, using a circular g...

AI Technical Summary

Problems solved by technology

In the unidirectional tensile test of existing metal pipe fittings, mechanical loading has the following problems: stress concentration exists at the application point of mechanical clamping, which will affect the result of unidirectional tensile test; the loading speed is slow, which belongs to quasi-static loading, and cannot simulate high Uniaxial Tensile Material Properties at Strain Rate

This invention solves the problem that the existing carbon fiber-reinforced resin-based composite material pipe mechanical properties test method is not suitable for thin-walled composite material pipe fittings. By adopting a new method for preparing tensile test pieces, the problem of metal joint damage to pipe fittings caused by mechanical connection is avoided. , providing a new test method for carbon fiber thin-walled composite pipe fittings

However, this method is only suitable for carbon fiber materials, not for metal pipe fittings

Images