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Bauschinger effect test fixture

A Bauschinger effect and test fixture technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve problems such as the inability to complete the Bauschinger effect test.

Active Publication Date: 2020-12-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a kind of Bauschinger effect test fixture, to solve the problem that the existing tension and compression material testing machine cannot complete the Bauschinger effect test

Method used

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Embodiment Construction

[0024] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. As a part of this specification, the principles of the present invention will be described through examples. Other aspects, features and advantages of the present invention will become clear through the detailed description. In the referenced drawings, the same reference numerals are used for the same or similar components in different drawings.

[0025] The present invention proposes a test fixture for the Bauschinger effect, which is mainly used to compress the test piece on a tension-compression material testing machine, so as to realize the purpose of verifying the Bauschinger effect of the material. The test piece is generally two ends An elongated structure with a width and a narrow center. The working object of the present invention is a test piece, which will produce problems of bending and instability when being compressed on a t...

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Abstract

The invention provides a Bauschinger effect test fixture which is matched with a tension and compression material test machine for use to perform a Bauschinger effect test on a test piece. The test piece is of a symmetrical strip-shaped structure with two wide ends and a narrow middle, and comprises two identical split bodies. The split body comprises a base and a gland, wherein a limiting groovecorresponding to the half profile of the test piece is longitudinally formed from the middle part to one end of the base, and a plurality of threaded through holes are symmetrically formed in two sides of the limiting groove; and the gland is provided with two threaded through holes along the central axis, the test piece is pressed by a bolt, a plurality of through holes are symmetrically formed in the two sides of the gland, and the gland is connected with the plurality of threaded through holes of the base through bolts, a through groove is formed in one end, corresponding to the opening ofthe limiting groove, of the gland and is used for placing a stress ultrasonic detection probe on the test piece. The problem that the existing tension and compression material test machine cannot complete a Bauschinger effect test can be solved.

Description

technical field [0001] The invention relates to the technical field of material performance research, in particular to a Bauschinger effect test fixture. Background technique [0002] The plastic strain strengthening caused by forward loading during metal plastic processing leads to the phenomenon of plastic strain softening (lower yield limit) of metal materials in the subsequent reverse loading process. This phenomenon was discovered by J. Bauschinger in 1886 in an experiment on the mechanical properties of metal materials. When the metal material is first stretched to the plastic deformation stage, unloaded to zero, and then reversely loaded, that is, when the compression deformation is performed, the compressive yield limit (σs) of the material is higher than that of the original state (that is, without pre-stretched plastic deformation and directly carried out Compression) yield limit (σs) is significantly lower (referring to the absolute value). If compression is per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04G01N3/08
CPCG01N3/04G01N3/08G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0258G01N2203/0423G01N2203/0658G01N2203/0676G01N2203/0098G01N2203/0268
Inventor 徐春广栗双怡苗兆伟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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