High-speed restrained cutting experimental device based on split Hopkinson pressure bar loading technology

Abstract

The invention discloses a high-speed restrained cutting experimental device based on split Hopkinson pressure bar loading technology. The high-speed restrained cutting experimental device based on the split Hopkinson pressure bar loading technology comprises a Hopkinson pressure bar loading mechanism which is used for pushing a bullet to move along a scheduled track at a scheduled speed, a laser velocity measurement mechanism which is used for measuring a movement speed before the bullet strikes a restrained cutting mechanism, the restrained cutting mechanism which is used for conducting restrained cutting of different plastic deformation degrees on a to-be-processed workpiece, a restrained cutting slideway mechanism which is used for giving a speed direction of restrained cutting, a fixing mechanism which is used for fixing the to-be-processed workpiece and a cutting stopping mechanism which is used for stopping a restrained cutting process. Different cutting speeds are obtained by adjusting pressure of air gun of the Hopkinson pressure bar and an initial position of the bullet in an acceleration gun barrel, different plastic deformation degrees can be obtained by adjusting the space between a tool of the restrained cutting mechanism and a restraining device, the high-speed restrained cutting experimental device based on the split Hopkinson pressure bar loading technology can be utilized to study a material interior microstructure evolution law when the material is with different strain rates and different plastic deformation degrees.

Description

technical field [0001] The invention is used in the field of nanometer material preparation, and especially refers to a high-speed constrained cutting experimental device based on the Hopkinson compression bar loading technology. Background technique [0002] Under severe plastic deformation conditions, the internal grains of the material can be refined, and even ultra-fine grains or nano-grains can be produced; this ultra-fine-grained or nano-grained material has many excellent mechanical properties, such as: high Strength, high fracture toughness and improved plasticity, etc. [0003] The degree of plastic deformation directly affects the degree of material grain refinement, which in turn affects the mechanical properties of the material. In order to obtain materials with different mechanical properties used in different working conditions, it is necessary to understand how the degree of plastic deformation affects the microstructure of materials, and then how to affect t...

AI Technical Summary

Problems solved by technology

The free cutting experiment is mainly carried out on the lathe. Due to the low cutting speed on the lathe, it is impossible to study the microstructure evolution law of the material under the condition of high strain rate.

Free cutting cannot effectively control the degree of plastic deformation in the cutting process

Therefore, the free-cutting device on the lathe cannot be used to study the microstructural evolution of materials under high strain rates and different degrees of plastic deformation

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