Low-temperature environmental chamber used for performing Hopkinson bar experiment on ice material

Abstract

The invention belongs to the technical field of experimental facilities used for testing dynamic mechanical properties of a material in a low-temperature environment and in particular relates to a low-temperature environmental chamber used for performing a Hopkinson bar experiment on an ice material. The low-temperature environmental chamber comprises a thermal insulation system, a refrigeration temperature control system and an experiment and observation system; a thermal insulation material fills a gap between an outer chamber body and an inner chamber body, a polytetrafluoroethylene sealingpart is arranged at the periphery of each of left and right rod holes; a compressor and a cooling fan are mounted on a platform outside a chamber body; a refrigeration pipe and an aluminum plate aremounted on the bottom surface and the left and right inner walls of the cavity of the inner chamber body; a temperature sensor is composed of a display screen and a temperature measuring probe, the temperature measuring probe is mounted in an experimental cavity, and the display screen is mounted outside the chamber body; and high-transparency glass observation windows are mounted in front, on theback and at the upper part of the chamber body. The low-temperature environmental chamber provided by the invention selects Freon as a refrigerant, a technology is mature and reliable, and cost is low, so that an experimental temperature can be maintained to be stable for a long time. The observation windows are formed in three directions respectively, so that illumination and image acquisition are facilitated in an experiment process.

Description

technical field [0001] The invention belongs to the technical field of experimental devices for testing the dynamic mechanical properties of materials in a low-temperature environment, and in particular relates to a low-temperature environment box used for ice material Hopkinson rod experiments. Background technique [0002] The split Hopkinson bar (SHPB) impact test system is widely used in the field of impact dynamics. It has the advantages of simple structure of experimental equipment, exquisite method, and convenient loading and debugging of waveforms. The separated Hopkinson bar uses the stress wave generated under high-speed impact to measure the dynamic mechanical properties of the research material. It can measure the stress-strain relationship of most engineering materials at a strain rate of 102-104 s-1. There are a wide range of applications in research. The principle is to decouple the stress wave effect and the strain rate effect during the experiment, thereby...

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Problems solved by technology

The existing devices of the same type adopt liquid nitrogen refrigeration method, which mainly has the following two disadvantages: 1) the effect of constant temperature for a long time is poor; 2) the cost is too high

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