Pulse force locating device and method suitable for metal tubing unidirectional tensile test

Abstract

The invention discloses a pulse force locating device and method suitable for a metal tubing unidirectional tensile test. The loading device comprises a first annular magnetic yoke arranged at an upper end of the to-be-tested metal tubing, and a second annular magnetic yoke located at a lower end of the to-be-tested metal tubing; a section of each of the first annular magnetic yoke and the secondannular magnetic yoke is a rectangle frame type with a gap; a constant magnetic field coil is arranged in a cavity of each annular magnetic yoke and used for producing radial constant magnetic field at the end part of the to-be-tested metal tubing; a pulse magnetic field coil is arranged in the cavity of each annular magnetic yoke and used for producing the induction vortex at the end part of theto-be-tested metal tubing; an axial through slot is formed at each pulse magnetic field coil, and the location of the through slot is corresponding to the gap of the annular magnetic yoke. The loadingdevice provided by the invention can provide uniform unidirectional tensile electromagnetic force for the to-be-tested metal tubing; the clamping point stress concentration phenomenon is inexistent since a clamping point is inexistent; and the loading of different strain rate can be realized by changing the pulse width of the electromagnetic force.

Description

technical field [0001] The invention belongs to the field of metal material testing, in particular to a pulse force loading device and method suitable for unidirectional tensile tests of metal pipe fittings, mainly used for bidirectional tensile tests of metal plate parts. Background technique [0002] The test results of the uniaxial tensile test of metal pipe fittings can not only optimize the product design, but also be used for the detection of product quality. In the unidirectional tensile test of existing metal pipe fittings, mechanical loading has the following problems: stress concentration exists at the point of application 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. [0003] The Chinese patent "A method for stretching large-scale metal pipe fittings (CN 106424176 A)" discloses a met...

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

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