Research experiment device and method of tiny particle sample crushing process

Abstract

The invention discloses a research experiment device and method of a tiny particle sample crushing process. A loading device selects a linear sliding platform structure as a loading part, a coder assembled at the bottom of a linear sliding platform rotating screw generates a continuous pulse signal in the process of loading to trigger a laser displacement sensor and a pressure sensor to synchronously record displacement and experiment force at the same time in the process when a sample is pressed and crushed, and the research experiment device is provided with a high-speed microscopic camera which records the real-time process of the sample from being pressed to being crushed. The research experiment device can be used for uniaxial compression crushing experiments of various tiny particlesamples (01.1-2mm) which are nonmetallic and irregular in shape, testing mechanical parameters like crushing strength and crushing work of the sample and studying the sample crushing process. In addition, the research experiment device can be utilized for study damage behaviors of a cutting board and a pressure head material in the process of sample crushing.

Description

technical field [0001] The invention relates to a mechanical testing technology of materials, in particular to an experimental device and an experimental method capable of testing the crushing strength of tiny particle samples and studying the crushing process. Background technique [0002] Particle crushing usually refers to the process of structural damage or cleavage of non-metallic samples under load, and splitting into multiple smaller samples. The problem of particle crushing widely exists in various engineering applications, such as ore crushing, the use of sand to increase the viscosity of the wheel-rail interface, and the crushing of samples of quartz sand used as foundation materials or fillers in engineering construction under heavy load conditions. [0003] Particle crushing strength is an evaluation of the ability of different samples to withstand normal loads, which is directly related to the particle size and is affected by the material, mineralogy, shape, por...

AI Technical Summary

Problems solved by technology

[0004] At present, the hydraulic uniaxial compression test devices commonly used in the experimental research of rock and soil mechanics are mostly used for the crushing mechanics test of macroscopic and large-scale rock mass samples, and the loading speed is too fast for small particle samples (<2mm). The breaking process of the sample will be too short, and the measured force-displacement curve data points are too few to judge the critical point of the sample breaking, and the test often ignores the embedding behavior of the anvil / indenter damage during the compression process of the sample ( This behavior is negligible for large-scale experiments, but the effect on small particle samples is more significant) leading to inaccurate measured results

In addition, due to the small size of the sample to be tested, the gap between the indenter and the anvil is usually less than 1mm during compression, which is difficult to monitor with traditional observation methods. Therefore, real-time monitoring of the sample from compression to crushing has always been a research the difficulty

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