Biaxial tensile fatigue test piece with conic curve transition and test method thereof

Abstract

The invention discloses a biaxial tensile fatigue test piece with conic curve transition and a test method thereof. The whole test piece is in a cross shape and is provided with four loading arms; theends of the four loading arms are integrated into a central area, the other ends of the four loading arms are integrated into a clamping area, a transition area formed by a conic curve is arranged between roots of every two adjacent loading arms, the axis of symmetry of the conical curves at least coincides with one axis of symmetry of the test piece, and a thickness reducing area is arranged between the transition area and the central area and thinned by adopting double arcs or a spline curve or a single arc. The test piece has the advantages that by adopting a conic curve transition mode, the stress strain in the central area is more uniform, and the influence between every two adjacent loading arms is reduced as much as possible; through the design of smooth transition and central areathinning, breakage and cracking of the test piece in the test process occur in the central area at first.

Description

technical field [0001] The invention relates to a tensile fatigue test piece, in particular to a conic curve transition biaxial tensile fatigue test piece and a test method thereof. Background technique [0002] The traditional uniaxial tensile testing method cannot truly reflect the stress of materials in actual engineering. At the same time, many materials have obvious anisotropy, and mechanical testing experiments under biaxial stress can obtain accurate mechanical properties of materials. Therefore, the design of the test piece is particularly important. At present, the biaxial loading experiments on materials mainly include the film swelling biaxial tensile test method, the pressure vessel biaxial tensile test method and the cross-shaped specimen biaxial tensile test method. [0003] In the existing methods, the film swelling method is only applicable to the film member, and the bulging apex is a bidirectional 1:1 stress state; the pressure vessel method is 2:1 for the...

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Problems solved by technology

[0002] The traditional uniaxial tensile test method cannot faithfully reflect the stress of the material in the actual project. At the same time, many materials have obvious anisotropy, and the mechanical test experiment under the biaxial stress state can obtain the accurate mechanical properties of the material. performance, therefore, the design of the test piece is particularly important

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