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Novel material dynamic mechanics performance testing method and device thereof

A technology of dynamic mechanics and measurement methods, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve problems such as data processing errors, and achieve the effect of compact measurement system and reduction of errors.

Inactive Publication Date: 2012-12-26
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, it is often difficult to ensure that the measured strain waveforms have the same starting point in time
In addition, due to the influence of the lateral dimension of the rod, the dispersion effect of the wave during propagation will cause changes in the waveform and also cause errors in data processing

Method used

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  • Novel material dynamic mechanics performance testing method and device thereof
  • Novel material dynamic mechanics performance testing method and device thereof
  • Novel material dynamic mechanics performance testing method and device thereof

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Embodiment Construction

[0034] The experimental principle of the present invention is: when the stress wave propagates inside the sample, due to the effect of lateral expansion and lateral inertia, the radial velocity v of the particle will be generated R , the particle velocity is measured by a high-precision velocimeter, and the stress waveform passing through the sample is measured by a high-sensitivity pressure sensor. The stress-strain relationship of the sample is obtained by processing the data.

[0035] Such as figure 1 As shown, the present invention includes: a stress pulse generation unit 1 , a pressure measurement unit 2 , a velocity measurement unit 3 , a data collection unit 4 , a data processing unit 5 and a stress wave absorption unit 7 .

[0036] The stress pulse generation unit 1 is used to generate a stress pulse with predetermined intensity and pulse width, and send it to the sample 6 to be tested.

[0037] The pressure measurement unit 2 is used to measure the stress wave passi...

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Abstract

The invention discloses a material dynamic mechanics performance testing method. The material dynamic mechanics performance testing method includes that (1) stress impulse waves with a certain stress are transmitted to a sample, motion speed vR in the radial direction perpendicular to the propagation direction of the stress waves is generated from mass points of the sample due to the transverse expansion effect and the transverse inertial effect when the stress waves are propagated inside the sample, the radial motion speed vR of the mass points is measured through a tachymeter, and the stress waves penetrating through the sample are measured through a pressure sensor; and (2) the collected radial motion speed vR measured through the tachymeter and pressure measured through the pressure sensor are calculated to obtain relationship of radial strain and longitudinal strain of the material sample. The invention further discloses a material dynamic mechanics performance testing device. Through combination of mass point speed measurement and pressure measurement, stress-strain relationship of the sample can be directly obtained, and errors caused by time displacement are decreased. At the same time, a measuring system becomes more compact.

Description

technical field [0001] The invention relates to a new method and device for testing dynamic mechanical properties of materials. Background technique [0002] The dynamic mechanical behavior of materials is extremely important for the research on the performance of structures such as penetration resistance and impact collision. The traditional Slip Hopkinson Pressure Bar (SHPB) technique is an effective experimental method for measuring the stress-strain relationship of materials under high strain rate conditions, and has been widely used in the dynamic mechanical behavior of materials under uniaxial impact loads. Research. Its prototype comes from a device for testing transient impulse stress invented by Hopkinson in 1914. Later, Kolsky, David and Hunter made substantial improvements to this device. Stress pulses are produced by impact or detonation of explosives. [0003] Modern SHPBs are all developed on the basis of Kolsky's work. The SHPB system is mainly composed of...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 吴先前黄晨光王曦宋宏伟魏延鹏
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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