Steel fiber tensioning and clamping fixture and steel fiber tensile strength testing system

Abstract

The invention discloses a steel fiber tensioning and clamping fixture and a steel fiber tensile strength testing system. The steel fiber tensioning and clamping fixture comprises a main bracket, a load transmission mechanism and a steel fiber test piece clamping and locking mechanism, and clamping pieces can effectively clamp and tension a steel fiber test piece in the tensioning process; the steel fiber tensile strength testing system comprises two sets of steel fiber tensioning and clamping fixtures and a data acquisition device, the data acquisition device comprises a load sensor, an extensometer and a controller, the two sets of steel fiber tensioning and clamping fixtures are used for clamping the steel fiber test piece, the extensometer is arranged on the steel fiber test piece, output ends of the load sensor and the extensometer are connected with two input ends of the controller, and an output end of the controller is connected with a computer. According to the steel fiber tensioning and clamping fixture and the steel fiber tensile strength testing system, the tensile strength and the deformation parameters of steel fibers as well as the stress-strain complete curve in the steel fiber breakage process can be accurately tested.

Description

technical field [0001] The invention relates to the technical field of engineering testing and testing, in particular to a steel fiber tension clamping fixture and a steel fiber tensile performance testing system. Background technique [0002] Steel fiber reinforced concrete is a new type of multi-phase formed by distributing short and thin steel fibers uniformly and chaotically in the ordinary concrete matrix, acting as a "bridge" between the concrete matrix and the aggregate, and making the concrete material tend to be isotropic. composite material. These randomly distributed steel fibers can effectively prevent the expansion of micro-cracks and the formation of macro-cracks in concrete, significantly improve the tensile, bending, impact and fatigue properties of concrete, and have good ductility and toughness, while steel fibers The performance of these excellent properties of concrete depends largely on the tensile strength of steel fibers relative to the concrete matri...

AI Technical Summary

Problems solved by technology

However, for a long time, due to the lack of corresponding test equipment, especially the lack of tension fixtures that can effectively clamp steel fibers, it is difficult to directly obtain the tensile properties of steel fibers.

In practice, the parameters of the tensile properties of steel fibers are often obtained by making standard tensile specimens from the parent material according to the tensile test methods of conventional materials, but because different types of steel fibers are produced in different ways process, the process will have a certain impact on the tensile properties of the finished steel fiber, resulting in a difference in the tensile properties of the steel fiber and its parent material, which will have an adverse effect on the reasonable selection of steel fibers, especially for cutting high-strength steel wires. steel fiber

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