Universal testing machine tension-compression integrated experimental fixture

Abstract

The invention discloses a universal testing machine tension-compression integrated experimental fixture which includes an upper fixture I, an upper fixture II, a lower fixture I and a lower fixture II and is characterized in that the upper fixtures and the lower fixtures achieve axial loading alignment of a plate specimen through matching of guide positioning parts of guide bases and positioning plates arranged at the guide parts; comb-shaped guide rail stand column structures arranged on the guide bases and the guide parts apply lateral restraint on the plate specimen, so as to effectively avoid a plate specimen buckling phenomenon from being generated; positive and negative tooth shapes are processed on the inner sides of the end parts of the upper fixtures and the lower fixtures respectively, so that the friction between the plate and the fixtures is increased, and slippage is avoided; grooves are processed in the outer sides of the end parts of the upper fixtures and the lower fixtures, to ensure that the fixtures and a testing machine chuck are firmly correctly positioned; with arrangement of positioning pins and positioning pin holes, correct positioning installation of the plate specimen in the fixtures can be achieved, and accurate firm cooperation between the fixtures is ensured. The universal testing machine tension-compression integrated experimental fixture has the advantages of simple structure, easy use, economic use and the like, and can ensure acquirement of accurate experimental results.

Description

technical field [0001] The invention relates to the technical field of material mechanics and performance research, in particular to a tension-compression integrated experimental fixture for a universal testing machine. Background technique [0002] Tensile compression test refers to a test method for determining material properties under axial tensile or compressive loads. It is one of the basic methods of material mechanical performance testing, and is mainly used to check whether the material meets the specified standards and to study the performance of the material. . The data obtained by the tension and compression test can reflect the Bauschinger effect of the material, the stress-strain relationship, and the basic elastic limit, elongation, elastic modulus, reduction of area, strength and other performance indicators. When the sheet is stretched, the sheet tends to be in a stable tension state under the action of axial tension; but when compressed, due to the non-cop...

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Problems solved by technology

The fixtures used in the literature "Continuous, large strain, tension / compression testing of sheet material" and "A sheet tension / compression test for elevated temperature" can only prevent the buckling of the measurement part, and require additional hydraulic clamping devices, and the structure is relatively complicated. Moreover, due to the limitation of the fixture, only the experiment at a temperature below 400°C can be realized, and the tension-compression experiment under higher temperature experimental conditions cannot be realized; the fixture used in the document "Elastic–plastic behavior of steel sheets under in-plane cyclic tension–compression at large strain" Axial load centering cannot be achieved, and the experimental friction is relatively large; therefore, it is urgent to provide an economical and practical experimental fixture that is applied in a large temperature range environment, ensures axial centering and prevents buckling, and has a simple structure. Good experimental results are of great significance

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