Rotatable double-layer plate tensile test device

Abstract

The invention discloses a rotatable double-layer plate tensile test device. The device comprises two force application seats which are oppositely arranged, and the force application seats are rigid bodies. Each force application seat comprises a base and a fixed end, each fixed end is connected with one end of the corresponding base, each fixed end can be connected with a tensile testing machine,clamping assemblies are arranged at the tops of the bases, the number of the clamping assemblies is consistent with that of the force application seats, the clamping assemblies correspond to the forceapplication seats one to one, and the clamping assemblies are rotationally arranged on the bases. Each clamping assembly comprises a sample table and a cover plate, the sample tables are rotationallyconnected with the bases, a sample is arranged between the cover plates and the sample tables, and bonding layers are arranged between the sample tables and the sample and between the cover plates and the sample. Machining such as punching and grinding on the sample is avoided, sample crushing caused by too tight clamping of the sample or sample slipping caused by too loose clamping of the sampleis avoided, the rotatable sample tables and the cover plates are used for clamping the upper face and the lower face of the sample, and meanwhile the bonding layers are arranged, so that the brittlerock sample is not affected by bending moment in any direction.

Description

technical field [0001] The invention relates to the technical field of tensile tests, in particular to a rotatable double-layer plate tensile test device. Background technique [0002] Tensile testing refers to a test method for determining the properties of a material under an axial tensile load. The data obtained from the tensile test can determine the elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength and other tensile performance indicators of the material. [0003] The Chinese patent with the publication number CN102384875A discloses a test device for mechanical properties of materials in a microscope pull-down compression-bending composite load mode. It uses a test device that is clamped and clamped by mechanical equipment. Small-sized brittle rock samples are small in size and easy to break , The strength is low, the clamping force is small, the sample cannot be clamped and it is easy to slip,...

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Problems solved by technology

[0004] In addition, the existing technology does not have any calibration measures during the sample loading process, which cannot ensure that the direction of the tensile force applied by the tensile testing machine is parallel to the original tensile direction of the sample, and an in-plane bending moment parallel to the direction of the upper and lower surfaces of the sample is generated, resulting in experimental results Inaccurate

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