Data processing method and data processing system for split Hopkinson bar experiment

Abstract

The invention relates to a data processing method and a data processing system for a split Hopkinson bar experiment. The data processing method comprises the steps of (a) setting a starting point interval which is symmetrical relative to a baseline according to the baseline of an incident wave waveform, and selecting a first intersection point of the incident wave waveform and an upper boundary ora lower boundary of the starting point interval as an incident wave starting point; and (b) obtaining a transmitted wave starting point and a reflected wave starting point according to the incident wave starting point obtained in the step (a), and aligning the incident wave starting point, the transmitted wave starting point and the reflected wave starting point to obtain stress and strain at thesame moment. The data processing method and the data processing system at least have the advantages of simple data processing process, reliable result and the like.

Description

technical field [0001] The invention belongs to the technical field of mechanical measurement, and in particular relates to a data processing method and a data processing system for a separated Hopkinson bar experiment. Background technique [0002] Strain rate is a measure of the rate at which a material deforms and is the derivative of strain with respect to time. When the strain rate exceeds 10 -2 the s -1 When the material deforms, the mechanical behavior it exhibits is called the dynamic mechanical behavior of the material. Materials often have high strain rates (10 2 the s -1 -10 4 the s -1 ) and even ultrahigh strain rates (10 4 the s -1 -10 6 the s -1 ) deformation. At this time, the failure mode of the material is different from the static load condition, and the strength and plasticity of many materials will change with the change of the strain rate. Therefore, the research on the dynamic mechanical properties of materials is of great significance. [...

AI Technical Summary

Problems solved by technology

In the prior art, the general practice is that the experimenter manually processes the data according to the obtained graph, and aligns the starting point of the reflected wave with the transmitted wave according to his observation of the graph. The reliability of the experimental data obtained by the above method is poor. The visual inspection of the data processor is aligned. Different experimenters are likely to get different results, and the same experimenter may also get different results at different times, so it is difficult to use the data of different experiments for comparison.

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