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A Data Processing Method Based on Split Hopkinson Compression Bar Experimental Technology

A Hopkinson pressure bar and experimental technology, which is applied in the field of data processing based on the split Hopkinson pressure bar experiment technology, can solve the problems of easy occurrence of abnormal data points and large curve fluctuation, and achieve the preservation of original data characteristics. , the effect of eliminating abnormal points and reducing initial errors

Active Publication Date: 2021-04-16
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At the same time, the voltage-time curve recorded by the acquisition device and the curve during processing are prone to abnormal data points, and due to factors such as noise interference, the overall curve is relatively volatile

Method used

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  • A Data Processing Method Based on Split Hopkinson Compression Bar Experimental Technology
  • A Data Processing Method Based on Split Hopkinson Compression Bar Experimental Technology
  • A Data Processing Method Based on Split Hopkinson Compression Bar Experimental Technology

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Experimental program
Comparison scheme
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Embodiment

[0071]The present embodiment will illustrate the technical effect of the data processing method by processing the SHPB dynamic compression force test data of Q235 steel at 2250 / s strain.

[0072]Embodiments of the present invention provide a data processing method based on the SHPB dynamic test device, the steps are as follows:

[0073]Step 1, read the data file of the incident rod and the transmit lever, and make it a graph, such as figure 2 , 3 ;

[0074] Step 2, zero and smooth adjustment of the incident rod and the transmitter rod data curve, such as Figure 4 , 5 ;

[0075] Step 3, select the first reflection wave and transmit waveform, such as using the point-to-point comparison method and the elastic wave velocity constant principle, such as Figure 6 , 7 ;

[0076] Step 4, select the reflection-transmissive calculation model to calculate the engineering stress strain curve ( Figure 8 ), Real stress strain curve ( Figure 9 ), Stress time curve ( Figure 10 ), Strain time curve ( ...

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Abstract

The invention discloses a data processing method based on the separated Hopkinson pressure bar experiment technology. The method includes the following steps: zeroing adjustment: performing zeroing adjustment on the waveform of the voltage-time curve obtained by the data acquisition device, that is, keeping the initial voltage value at zero; data smoothing: smoothing the voltage-time curve to eliminate abnormal points ;Select waveform: select the wave head and tail position of the incident wave, reflected wave and transmitted wave, and intercept the waveform; calculate the result: calculate the engineering stress-strain curve, real stress-strain curve, stress-time curve, Strain time curve and strain rate time curve; data storage: save all the obtained waveforms and data. The method of the invention is suitable for processing test data of dynamic compressive mechanical properties, and has strong practicability.

Description

Technical field[0001]The present invention relates to the field of material dynamic mechanical testing, and more particularly to a data processing method based on separating Hopkinson's experimental techniques.Background technique[0002]The strain rate is a measure of the rate of material deformation rate, which is the derivative of the strain to time. When the strain rate exceeds 10-2s-1When the material is deformized, the mechanical behavior of the material is called the dynamic behavior of the material. Materials often occur in oil drilling, aerospace, especially weapons, etc., high strain rates often occur (102s-1-104s-1) Or even high strain rate (104s-1-106s-1Deformation. At this time, the failure form of the material is different from the static load conditions, and the strength and plasticity of many materials will vary with the change in strain rate. Therefore, the study of dynamic mechanical properties of materials is of great significance.[0003]At present, the most widely u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/02G01N3/06
CPCG01N3/02G01N3/06
Inventor 王金相李元龙黄瑞源
Owner NANJING UNIV OF SCI & TECH
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