Method for quantitatively identifying holes in leading wire melting trace

A technology for quantitative identification of internal holes, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problems of large differences in hole distribution, irregular appearance of wire melting marks, and inability to achieve quantitative identification, etc., to achieve convenient sampling operation and wide The effect of applying the foreground

Inactive Publication Date: 2017-08-04
SUN YAT SEN UNIV
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Problems solved by technology

But this observation method is qualitative, because only one section of the melt line can b

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  • Method for quantitatively identifying holes in leading wire melting trace
  • Method for quantitatively identifying holes in leading wire melting trace
  • Method for quantitatively identifying holes in leading wire melting trace

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[0068] The present invention will be further described below in conjunction with specific embodiments.

[0069] See figure 1 As shown, the method for quantitatively identifying internal holes in a wire melt provided in this embodiment, the specific process is as follows:

[0070] 1) Extract a wire sample with melt marks.

[0071] 2) Determine whether the wire sample is a single-strand wire, and determine the equivalent diameter d of the unmelted section of the wire 0 ;

[0072] If the sample is a single-stranded wire, directly use a vernier caliper to measure the wire diameter of the unmelted section as the equivalent diameter; if the sample is a multi-stranded wire, cut a section of the unfused wire, and use a vernier caliper to measure its length. 1 , And use an analytical balance to determine its mass m 1 , And then through the calculation formula The equivalent diameter of the multi-strand wire is calculated, where ρ 1 Is the density of the metallic conductor material of the wire....

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Abstract

The invention discloses a method for quantitatively identifying holes in leading wire melting trace. The method comprises the following steps: 1) extracting a leading wire sample with a melting trace; 2) judging whether the leading wire sample is a single stranded wire or not, and determining the equivalent diameter d0 of the unmelted segment of the leading wire; 3) extracting a leading wire melting trace sample, and detecting the mass ms of the melting trace sample by using an analytical balance; 4) detecting the volume Vs of the melting trace sample by using a buoyancy technology; 5) calculating the equivalent weight rho c of the melting trace; and 6) calculating the equivalent hole rate Pc of the melting trace. The volume of the leading wire melting trace sample is detected through the buoyancy technology, the diameter of the leading wire and the density of the melting trace sample are equivalently processed, and the equivalent hole rate of the holes in the leading wire melting trace is finally calculated, so the disadvantage of unable accurate quantitative detection of the hole rate in the melting trace of metallographic identification methods is made up, the quantitative identification of the holes in the melting trace is realized, and the accuracy of a material evidence identification result is increased.

Description

technical field [0001] The invention relates to the technical field of physical evidence identification of electrical fire melt marks, in particular to a quantitative identification method for inner holes of lead melt marks. Background technique [0002] The fire occurrence process is very complicated, a process involving physical and chemical changes, and a disaster caused by uncontrolled combustion. It has the highest frequency of occurrence among various disasters, is highly destructive, and has the greatest social impact. Among the fires that occur, electrical fires account for a large proportion, often causing huge economic losses and casualties. The situation of electrical fires in China has become more and more serious in recent years. [0003] Therefore, the Thirteenth Five-Year Plan for National Economic and Social Development clearly proposes to improve disaster prevention, mitigation and relief mechanisms, improve disaster investigation and evaluation, and strengt...

Claims

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Application Information

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IPC IPC(8): G01N9/36
CPCG01N9/36
Inventor 梁栋杨文兵莫善军杨忠衡王嘉兴
Owner SUN YAT SEN UNIV
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