Assembly device and operation method for reducing axial eccentricity of tensile test piece

Abstract

The invention discloses an assembly device capable of reducing the axial eccentricity of a tensile sample, and an operation method. The assembly device comprises a sample assembly steel platform (1), two clamping devices (2), two pulling-jacking devices (3), two location rods (4) and two pressing devices (5), wherein the clamping devices (2) next to the two sides of the sample, and are fixed with the sample assembly steel platform by U-shaped clamps; each pulling-jacking device (3) is composed of a pulling-jacking screw rod and a pulling-jacking disc surface; the location rods (4) are fixed onto the sample assembly steel platform by connection gaskets and locking nuts; and the pressing devices (5) are fixed with the sample assembly steel platform by U-shaped clamps. According to the invention, steel sheets with circular holes are symmetrically bonded on the end parts of the tensile sample with a rectangular section, of a cement base, and loads are applied through shafts inserted in the circular holes. According to the invention, the position centring of the circular holes is ensured through operating the pulling-jacking devices (3) and the pressing devices (5), and the bonding materials are controlled to be uniform, so that the steel sheets are closely and flatly bonded on the surface of the sample, and then the axial eccentricity of tensile sample is reduced.

Description

technical field [0001] The invention belongs to the field of testing the basic mechanical properties of cement-based materials, in particular for the uniaxial tensile test of cement-based thin plate test pieces. Background technique [0002] When studying the uniaxial tensile properties of cement-based thin plate specimens, the axial tensile test is usually used to complete. In order to avoid damage at the end of the test piece during the test, steel sheets are usually pasted symmetrically with high-strength bonding materials at the end of the test piece for reinforcement, and round holes are opened on the steel sheet at the same time. The load is applied to the specimen through a shaft inserted into the circular hole. The key to the test is whether the load can act on the axial center of the specimen. If the position of the round hole of the steel sheet cannot be centered and the thickness of the adhesive layer is not well controlled during the pasting process, eccentric ...

AI Technical Summary

Problems solved by technology

What the present invention is aimed at is a kind of cement-based rectangular cross-section thin plate. When the steel sheet is pasted symmetrically with high-strength bonding material on its end, by solving the centering problem of the round hole position on the pasting steel sheet and the bonding material The problem of uniformity and paste flatness, try to reduce the axial eccentricity of such tensile specimens from the perspective of specimen processing

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