Tensile test fixture used for tubular product sample

Abstract

The invention discloses a tensile test fixture used for a tubular product sample, which comprises an integral fixture comprising two concave die fixtures, two concave die cushion blocks, two convex die fixtures and two convex die cushion blocks, an upper positioning plate and a lower positioning plate. The two convex die cushion blocks are respectively fixed on the mounting surfaces of the two convex die fixtures; and the two concave die cushion blocks are respectively fixed on the mounting surfaces of the two concave die fixtures, and the convex arc faces of the convex die cushion blocks and the concave arc faces of the concave die cushion blocks are matched to become a pair of fixtures. The upper positioning plate and the lower positioning plate are respectively fixed on the side surfaces of the two convex die fixtures. The tensile test fixture is connected and positioned with a testing machine by the flanges of the convex die fixtures and the flanges of the concave die fixtures. The invention can firmly fix the tubular product sample and avoids the performance change of a tubular product caused by the condition that both ends of the tubular product sample are flatly clamped, thereby obtaining the accurate tensile property of the tubular product and having the characteristics of simple structure and convenient and reliable use.

Description

technical field [0001] The invention relates to the technical field of plastic forming of metal pipes, in particular to a tensile test fixture for pipe samples. Background technique [0002] The precise forming of thin-walled tubes by NC bending is a complex nonlinear process under the interaction of multi-parameter coupling, and the accuracy of the plastic constitutive parameters of tubes is one of the key factors affecting the quality of finite element numerical simulation of tubes NC bending. The plastic constitutive parameters of thin-walled pipes are difficult to find directly from the manual, and there may be differences in the plastic constitutive parameters of pipes of the same grade and specification, and the forming properties of the material are affected by the forming mode. At present, most of the plastic constitutive parameters of pipes are determined by uniaxial tensile test method, which is simple and easy to implement. [0003] In the national standard for t...

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Problems solved by technology

[0004] In order to overcome the easy deviation of the pipe sample when it is clamped and to avoid the pipe performance change caused by the clamping end of the pipe sample being flattened, the present invention proposes a tensile test fixture for the pipe sample

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