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Data processing method based on separated Hopkinson press bar experiment technique

A technology of Hopkinson pressure bar and experimental technology, which is applied in the field of data processing based on separate Hopkinson pressure bar experimental technology, which can solve problems such as prone to abnormal data points and large fluctuations in curves, and achieve the preservation of original data characteristics , Eliminate outliers and reduce the effect of initial error

Active Publication Date: 2018-08-07
NANJING UNIV OF SCI & TECH
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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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  • Data processing method based on separated Hopkinson press bar experiment technique
  • Data processing method based on separated Hopkinson press bar experiment technique
  • Data processing method based on separated Hopkinson press bar experiment technique

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Experimental program
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Embodiment

[0071] This embodiment illustrates the technical effect of this data processing method by processing the SHPB dynamic compression mechanical property test data of Q235 steel at a strain rate of 2250 / s.

[0072] The embodiment of the present invention provides a kind of data processing method based on SHPB dynamic testing device, and the steps are as follows:

[0073]Step 1, read the data files of the incident rod and the transmitted rod respectively, and make it into a graph, such as figure 2 , 3 ;

[0074] Step 2, perform zeroing and smooth adjustment on the data curves of the incident rod and the transmitted rod respectively, such as Figure 4 , 5 ;

[0075] Step 3, using the point-by-point comparison method and the principle of elastic wave velocity invariance to select the first reflected wave and transmitted wave waveform respectively, as Figure 6 , 7 ;

[0076] Step 4, select the reflection-transmission calculation model to calculate the engineering stress-strai...

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Abstract

The invention discloses a data processing method based on a separated Hopkinson press bar experiment technique. The method includes the steps: return-to-zero adjustment: performing a wavelike return-to-zero adjustment on a voltage-time curve acquired by a data acquisition unit, and namely, enabling an initial voltage value to keep zero; data smoothing: smoothing the voltage-time curve, and removing abnormal points; waveform selection: selecting head and tail positions of incident waves, reflected waves and transmitted wave, and intercepting waveforms; result calculation: calculating the intercepted waveforms to obtain engineering stress curve, a true stress-strain curve, a stress-time curve, a strain-time curve and a strain rate time curve; data storage: storing all acquired waveforms anddata. The data processing method is applicable to testing data for processing dynamic compressive mechanical properties and has high practicability.

Description

technical field [0001] The invention relates to the technical field of dynamic mechanical testing of materials, in particular to a data processing method based on a separated Hopkinson compression bar experiment technology. 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 loading 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 significanc...

Claims

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Application Information

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Patent Type & Authority Applications(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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