Cross-shaped biaxially tensile metal sheet test piece for yield behavior test and preparation method thereof

Abstract

The invention provides a cross-shaped biaxially stretched metal sheet specimen for yield behavior testing and a preparation method thereof. The cross-shaped biaxially stretched metal sheet specimen of the present invention includes a central test area, and the periphery of the central test area extends outwards There are four tension arms, two symmetrically distributed tension arms form a pair, and the front and back surfaces of at least one pair of tension arms are equipped with tensile cladding metallurgically combined with cladding metal materials and the surface of the tension arms. Floor. The cross-shaped biaxially stretched metal sheet specimen of the present invention can avoid the premature fracture of the tensile arm during the biaxially tensile test, thereby obtaining the stress-strain response relationship and yield of different biaxially tensile loading ratios under the large plastic strain of the metal sheet track; the preparation method of the cross-shaped biaxially stretched metal sheet specimen is simple to operate, and greatly improves the tensile performance of the tension arm.

Description

technical field [0001] The invention relates to the field of mechanical performance testing of metal thin plate materials, in particular to a cross-shaped biaxially stretched metal thin plate specimen for yield behavior testing and a preparation method thereof. Background technique [0002] The stress-strain response relationship of the metal sheet under different loading ratios (Fx:Fy, Fx is the load in the X direction, Fy is the load in the Y direction, the acting direction of Fx and the acting direction of Fy are perpendicular to each other) is the research plate Fundamental data for yield behavior, calibration and validation of advanced material models for sheet metal. The biaxial tensile test for cross-shaped specimens is an important test method to obtain the stress-strain response relationship of metal sheets under different loading ratios. This kind of test has the advantages of no friction, no out-of-plane stress, and convenient control of loading ratios. Such as ...

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Problems solved by technology

[0003] Therefore, in the prior art, after the bidirectional tensile test of the cross-shaped specimen, the fracture phenomenon often occurs on the tensile arm 2, which leads to a very limited maximum plastic strain in the central test area 1, and it is impossible to obtain metal Stress-strain response relationship and yield locus of thin plate under different loading ratios under large plastic strain

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