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Dynamic performance detection method for foam materials or soft materials

A foam material and dynamic performance technology, which is applied to the measurement, measurement device, and analysis material of the property force of piezoelectric resistance materials, can solve the problems of complex test methods and low measurement sensitivity, and achieve simple and easy measurement. The effect of high sensitivity and wide frequency response

Inactive Publication Date: 2007-05-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of complex test methods and low measurement sensitivity in the prior art, the present invention provides a method for measuring dynamic properties of foam materials or soft materials

Method used

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  • Dynamic performance detection method for foam materials or soft materials
  • Dynamic performance detection method for foam materials or soft materials
  • Dynamic performance detection method for foam materials or soft materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: With reference to Figures 1 to 3, the present invention first divides the transmission rod of the Hopkinson pressure rod into two sections, then takes a piezoelectric film with a thickness of 10 μm, and pastes a micron-scale insulating film on both sides thereof, and then The piezoelectric film with the insulating film pasted is clamped between two transmission rods, and a one-way limiter is installed in the middle of a transmission rod close to the sample. The one-way limiter is fastened to the transmission rod with a clamp sleeve, and only It is allowed to move away from the sample; the other section of the transmission rod is close to the fixed energy absorber through the rubber pad, and the pre-tightening force of the piezoelectric film is adjusted through the rubber pad. The output electrode of the piezoelectric film is electrically connected to the impedance transformer, and the impedance transformer adopts LF356 field effect device, and the impedance...

Embodiment 2

[0016] Embodiment 2: With reference to Figures 1 to 3, the present invention first divides the transmission rod of the Hopkinson pressure rod into two sections, then takes a piezoelectric film with a thickness of 30 μm, and pastes a micron-level insulating film on both sides thereof, and then The piezoelectric film with the insulating film pasted is clamped between two transmission rods, and a one-way limiter is installed in the middle of a transmission rod close to the sample. The one-way limiter is fastened to the transmission rod with a clamp sleeve, and only It is allowed to move away from the sample; the other section of the transmission rod is close to the fixed energy absorber through the rubber pad, and the pre-tightening force of the piezoelectric film is adjusted through the rubber pad. The output electrode of the piezoelectric film is electrically connected to the impedance transformer, and the impedance transformer adopts LF356 field effect device, and the impedance...

Embodiment 3

[0017] Embodiment 3: With reference to Figures 1 to 3, the present invention first divides the transmission rod of the Hopkinson pressure rod into two sections, then takes a piezoelectric film with a thickness of 50 μm, and pastes a micron-scale insulating film on both sides thereof, and then The piezoelectric film with the insulating film pasted is clamped between two transmission rods, and a one-way limiter is installed in the middle of a transmission rod close to the sample. The one-way limiter is fastened to the transmission rod with a clamp sleeve, and only It is allowed to move away from the sample; the other section of the transmission rod is close to the fixed energy absorber through the rubber pad, and the pre-tightening force of the piezoelectric film is adjusted through the rubber pad. The output electrode of the piezoelectric film is electrically connected to the impedance transformer, and the impedance transformer adopts LF356 field effect device, and the impedance...

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Abstract

The invention discloses a foam material or soft material dynamic performance measurement method, for the foam material or soft material dynamic performance measurement. First, divide the transmission pole of the Hepuxinsen strut into two sections, and then take a thickness of 10-60 mum piezoelectric film, and affix the micron-level insulation membrane on its both sides, and then paste the piezoelectric film with insulation membrane sandwiched between two transmission poles, and the section of the transmission pole near the specimen is equipped with a one-way limiter in the center, and the one-way limiter is fastened with the transmission pole by the clip fixture; put another section of the transmission pole close to fixed stationary energy absorber through the rubber pad, and the rubber pad modulates the pre-tension through the piezoelectric film; electrical connect the piezoelectric film output electrode and the impedance converter; add sample loading, and through the output of impedance converter to obtain foam material or soft material dynamic force or stress force value. The invention uses the piezoelectric film, making dynamic performance measurement of foam or soft material simple and easy, and with high measurement sensitivity.

Description

technical field [0001] The invention relates to a method for measuring dynamic performance of foam material or soft material. Background technique [0002] In order to test the dynamic performance of foam or soft materials under high loading rate, split Hopkinson compression bar is an ideal test method. However, due to the low strength, density and stress wave velocity of foam or soft materials, it is very difficult to test the properties of these materials directly using a split Hopkinson pressure bar. For example, when testing the behavior of foam materials at high strain rates directly with a traditional split Hopkinson compression bar, the results are often too small to obtain results because the strain signal on the transmission bar is too small. One approach is to replace conventional struts with viscoelastic rods with low mechanical impedance to achieve a higher signal-to-noise ratio. However, viscoelastic materials have dispersion and attenuation for stress waves, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N33/00G01L1/18
Inventor 郭伟国
Owner NORTHWESTERN POLYTECHNICAL UNIV
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