Axial stretching test device for cement based composite material test piece

Abstract

The invention discloses an axial stretching test device for a cement based composite material test piece. The device comprises a frame assembly, a spherical hinge assembly, a sliding frame assembly and a steel belt, wherein the frame assembly is connected with the sliding frame assembly; the sliding frame assembly is connected with the spherical hinge assembly; and the spherical hinge assembly is connected with the steel belt. The axial stretching test device disclosed by the invention has the specific advantages that 1, the device is simple in operation, convenient to detach and low in cost; 2, due to embedded bolts and adhered steel sheets of the device, irregular fractures at two ends of the test piece caused by stress concentration can be reduced in the process of stretching the test piece; 3, with the adoption of flexible constraints, the centering efficiency of the steel belt and the spherical hinge assembly can be improved without generating additional end bending moment, and the axial eccentricity is effectively eliminated; 4, the stress concentration phenomenon is effectively eliminated, the stress area is enlarged, and the overall stability of the frame assembly is enhanced; 5, the influence on the damage of the test piece under the load effect can be reflected; and 6, an LVDT rebound displacement sensor is connected with the steel belt so as to test the displacement of the steel belt, the displacement of the steel belt is one part of the overall displacement and cannot be neglected in testing.

Description

technical field [0001] The invention belongs to a device for reducing the axial eccentricity of a test piece, in particular for the axial tension test of the cement-based composite material test piece. Background technique [0002] Mr. Wu Zhongwei once pointed out that compounding is the main way to improve the performance of cement-based materials, and fiber reinforcement is its core. The use of fibers can effectively eliminate early cracking of cement-based materials and improve the tensile strength and toughness of materials. Fiber-reinforced concrete or fiber-reinforced mortar has been improved in performance and application with the improvement of fiber production technology and the continuous improvement of admixture product performance. Great development. [0003] Existing test devices for directly applying axial tensile stress have not been widely used. The main reasons are: (1) The existing test devices for directly applying axial tensile stress are complex in stru...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The present invention provides an axial tensile test device for a cement-based composite material specimen, the purpose of which is to solve the problem that the axis of the cement-based composite material specimen cannot be accurately centered, resulting in (additional) bending moments at the end , and also use the method of pre-embedded screw and bonded steel sheet at the end of the specimen to avoid damage to the end of the cement-based composite material specimen

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