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Characterization method for dynamic fracture performance of metal material

A technology of metal materials and fracture performance, which is applied in the direction of analyzing materials, using applied repetitive force/pulsation force to test material strength and strength characteristics, etc. It can solve the problems that the results are not necessarily accurate, the stress intensity factor is difficult to measure in real time, and the design and connection of test pieces are difficult and other issues to achieve the effect of avoiding interference

Pending Publication Date: 2021-06-29
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the SHPB loading method has the above advantages, this method has not been able to form a standard for the following three reasons: first, the measurement of crack initiation time is inaccurate; second, the design of the specimen and its connection are difficult; third, The stress intensity factor is difficult to measure in real time, and the approximate formulas generated by simulation are currently used. Therefore, the obtained K Id The value is largely affected by the choice of model, and the results obtained are not necessarily accurate

Method used

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  • Characterization method for dynamic fracture performance of metal material
  • Characterization method for dynamic fracture performance of metal material
  • Characterization method for dynamic fracture performance of metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A quasi-in-situ experimental analysis method for dynamic deformation and failure behavior of metal materials, the steps of which are as follows:

[0049] (1) Prepare standard three-point bending samples of aluminum alloy, the dimensions of which are: B is 3mm, W=2B, S=4W, L=13mm;

[0050] (2) The end of the incident rod and the front end of the transmission rod of the separated Hopkinson pressure rod with a diameter of 30 mm are equipped with punches for loading and supporting the sample. Strain gauges are attached to the incident rod and the transmission rod. For step (1 ) The prepared sample is dynamically loaded with a loading air pressure of 2 atm on a separate Hopkinson pressure rod equipped with a punch, so that the sample is destroyed during the first round of stress wave loading, and the loading process is obtained through the signal acquisition system Stress-time curves of incident wave, transmitted wave and reflected wave;

[0051] (3) Calculate the three str...

Embodiment 2

[0057] A quasi-in-situ experimental analysis method for dynamic deformation and failure behavior of metal materials, the steps of which are as follows:

[0058] (1) prepare a standard three-point bending sample of steel, its size is: B is 3mm, W=2B, S=4W, L=15mm;

[0059] (2) The end of the incident rod and the front end of the transmission rod of the separated Hopkinson pressure rod with a diameter of 35 mm are equipped with punches for loading and supporting the sample. Strain gauges are attached to the incident rod and the transmission rod. ) The prepared sample is dynamically loaded with a loading air pressure of 3atm on a separate Hopkinson pressure rod equipped with a punch, so that the sample is destroyed during the first round of stress wave loading, and the loading process is obtained through the signal acquisition system Stress-time curves of incident wave, transmitted wave and reflected wave;

[0060] (3) Calculate the stress-time curves of the incident wave, trans...

Embodiment 3

[0063] A quasi-in-situ experimental analysis method for dynamic deformation and failure behavior of metal materials, the steps of which are as follows:

[0064] (1) prepare a standard three-point bending sample of titanium alloy, its size is: B is 4mm, W=2B, S=4W, L=18mm;

[0065] (2) The end of the incident rod and the front end of the transmission rod of the separated Hopkinson pressure rod with a diameter of 40 mm are equipped with punches for loading and supporting the sample. Strain gauges are attached to the incident rod and the transmission rod. For step (1 ) The prepared sample is dynamically loaded with a loading air pressure of 3.5atm on a separate Hopkinson pressure rod equipped with a punch, so that the sample is destroyed in the first round of stress wave loading process, and the load is obtained through the signal acquisition system Stress-time curves of incident, transmitted and reflected waves in the process;

[0066] (3) Calculate the stress-time curves of th...

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Abstract

The invention discloses a characterization method for the dynamic fracture performance of a metal material, and belongs to the technical field of material dynamic mechanical experiments. The characterization method comprises the step of dynamically loading a standard three-point bending sample by using a split Hopkinson pressure bar, wherein a characterization parameter is an energy value consumed when the standard three-point bending sample is dynamically fractured, the split Hopkinson pressure bar is a split Hopkinson pressure bar, the loading air pressure is 2-4 atm, the deformation strain rate ranges from 10<3>s<-1> to 10<4>s<-1>, punches are arranged at the tail end of an incident bar and the front end of a transmission bar of the split Hopkinson pressure bar and are used for loading and supporting a sample, strain gauges are attached to the incident bar and the transmission bar, and stress-time curves of incident waves, transmitted waves and reflected waves in the loading process are obtained through using a signal acquisition system. The characterization method provided by the invention can quantitatively characterize the dynamic fracture performance of the metal material under the strain rate of 10<3>s<-1>-10<4>s<-1>.

Description

technical field [0001] The invention relates to a characterization method for the dynamic fracture performance of metal materials, belonging to the technical field of material dynamic mechanics experiments. Background technique [0002] The dynamic deformation and failure behavior of materials refers to the mechanical behavior of materials under high strain rate (higher than 5 / s), involving many civil and military fields such as explosive forming, impact synthesis, high-speed penetration and impact protection. [0003] Studies have confirmed that there is a clear difference between the dynamic and quasi-static mechanical behavior of materials: under quasi-static conditions, the strain rate at which the material deforms is low, and each unit inside the material can be regarded as at any point in time. The state of stress balance and heat balance; under dynamic conditions, the strain rate of deformation is relatively high. At this time, the interior of the material deviates fr...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/36
CPCG01N3/02G01N3/36
Inventor 骆雨萌叶文君惠松骁刘睿于洋宋晓云李艳锋
Owner GRIMAT ENG INST CO LTD
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