Method for measuring explosion stress in medium based on PVDF sensor

A sensor and medium technology, which is applied in the field of explosion stress wave detection, can solve the problems affecting the detection accuracy of PVDF sensor, damage of PVDF sensor, and inability to be used again, so as to avoid damage, reduce interface reflection, and reduce wave impedance Effect

Pending Publication Date: 2022-01-14
南京君缘科爆工程技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the traditional PVDF sensor is used to detect the explosion stress, the PVDF sensor is directly placed in the material, and when the explosive explodes, it is easy to cause damage to the PVDF sensor and cannot be used again. At the same time, the PVDF sensor is directly placed in the material. It will also make it damp and affect the accuracy of PVDF sensor detection. It is inconvenient to use and not suitable for widespread promotion.

Method used

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  • Method for measuring explosion stress in medium based on PVDF sensor
  • Method for measuring explosion stress in medium based on PVDF sensor
  • Method for measuring explosion stress in medium based on PVDF sensor

Examples

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Embodiment 1

[0036] pass Figure 1-3 Shown, the explosion stress measuring method in the medium based on PVDF sensor that the present invention proposes, method comprises the following steps:

[0037] S1: Put a single PVDF sensor in the glue, make the glue cover the surface of the PVDF sensor, and then take it out to dry. By covering the surface of the PVDF sensor with glue, the PVDF sensor can prevent water from entering the PVDF sensor during the detection process. In this way, it can avoid the messy signal generated by the PVDF sensor, improve the measurement accuracy of the PVDF sensor, and at the same time protect the PVDF sensor to prevent the PVDF sensor from being scratched by debris during the explosion;

[0038] S2: Take an open cylinder, pour concrete into the cylinder with a height half the height of the cylinder, then place the dried PVDF sensor on the concrete in the cylinder, then seal the remaining part of the cylinder with concrete, and wait Dry naturally, remove the cyli...

Embodiment 2

[0056] Be the specific implementation of the explosion stress measurement method in the medium based on PVDF sensor of the present invention, differ from embodiment 1 in that:

[0057] In the step S9, the medium is sand, the explosive is 400g of TNT in bulk, and the expanding explosive is 13g.

[0058] Working principle: In embodiment 1, the water filled in the reserved blast hole is replaced with sand, and then the experimental results of the propagation law of the explosion stress wave in the sand can be obtained. The explosive that adopts in is different from the explosive in embodiment 1, and the explosive stress peak value that concrete records is as shown in table 1 below:

[0059] Table 1 Test 1, test 2 measured explosion stress peak value (unit: MPa)

[0060] 1# 2# 3# 4# 5# 6# test 1 25.7 29.5 45.2 72.1 8.0 2.3 test 2 15.5 17.9 100.6 / 12.0 8.4

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Abstract

The invention discloses a method for measuring explosion stress in a medium based on a PVDF sensor, and relates to the field of detection of explosion stress waves. In the prior art, when a PVDF sensor is used to detect explosion stress, the PVDF sensor is directly placed in a material, and after an explosive explodes, the PVDF sensor is easy to damage and cannot be used for the second time; and as the PVDF sensor is directly placed in the material, the PVDF sensor can be affected with damp, the detection accuracy of the PVDF sensor can be influenced, the PVDF sensor is inconvenient to use and is not suitable for wide popularization. In view of the problems, the invention provides the following scheme that the method comprises the step of: S1, putting a single PVDF sensor into glue, enabling the glue to cover the surface of the PVDF sensor, and then taking out and airing the PVDF sensor. The PVDF sensor can be reused, economic benefits are greatly improved, meanwhile, wave impedance can be effectively reduced, interface reflection can be reduced, the detection accuracy of the PVDF sensor is effectively improved, and the PVDF sensor is convenient to use and suitable for wide popularization.

Description

technical field [0001] The invention relates to the detection field of explosion stress waves, in particular to a method for measuring explosion stress in a medium based on a PVDF sensor. Background technique [0002] The internal shock wave attenuation characteristics of materials under explosive load is one of the main indicators to measure the anti-blast performance of materials. In the explosive impact load test, because of its short load loading time (in microseconds) and high strength, the sensor is required to have a wide frequency band, fast response time, and reasonable structure, and because the explosive impact test is a destructive test, the sensor after the test It cannot be reused, so the cost of the sensor should not be too high. Polarized polyvinylidene fluoride (PVDF) has become an ideal piezoelectric material due to its unique piezoelectric properties (high sensitivity, high frequency response), mechanical flexibility, thin thickness, and low cost. Tests ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01L5/14
CPCG01L5/14
Inventor陈顺禄程建辉潘惠忠龙源徐全军卢红标
Owner南京君缘科爆工程技术有限公司