Material high-pressure impact heat insulation data measurement method based on continuous resistance probe

Abstract

The invention belongs to the technical field of explosion and impact tests, and particularly relates to a material high-pressure impact heat insulation data measurement method based on a continuous resistance probe. The material high-pressure impact heat insulation data measurement method comprises the following specific measuring steps that (1) the continuous resistance wire probe penetrates through an explosive, a standard material and a to-be-measured material in sequence along the central axis of a cylindrical container, and a coaxial cable is used for connecting the continuous resistancewire probe with a signal recorder; (2) the signal recorder is started, and recording is performed to obtain a dynamic voltage or current signal caused by the change of the resistance value of the continuous resistance wire probe after the explosive is ignited; and (3) the electric signal is converted into a time travel curve, the data of each section undergoes fitting and derivation to obtain theshock wave speed of a corresponding portion, and the impact heat insulation data of the to-be-measured material is solved and obtained according to an impedance matching technology. The material high-pressure impact heat insulation data measurement method has the effects and advantages that a measuring element is a universal sensing element, so that the application range is wide; the experiment system is simple, and the cost is low; and the size of the material is not limited, and the method is suitable for measuring a large-size sample.

Description

technical field [0001] The invention belongs to the technical field of explosion and impact testing, and relates to a method for measuring high-voltage impact heat insulation data of materials based on a continuous resistance probe. Background technique [0002] The shock adiabatic line of the material refers to the three conservation relations on the shock wave front and the five unknown parameters (pressure p, relative specific volume V, internal energy E, particle velocity U p and the shock wave velocity U s ) The relationship curve between any two of them, where p-V line, p-U p Line and U s -U p Lines are the three most commonly used forms. They are the basis for studying the phase transition and equation of state of materials under high pressure, and are the basis for solving impact dynamics problems and performing related numerical calculations. Most of the measurement methods of material impact adiabatic line adopt the flyer technology driven by chemical explosion...

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Problems solved by technology

[0004] (1) The measurement principle of the electric probe method is relatively simple. The average velocity of the shock wave is obtained by recording the travel time of the shock wave in a sample of known thickness, which has poor applicability and can only be used for the measurement of metal flyers. The low-pressure trigger response of the needle is slow, and it is not suitable for the precise measurement of impact insulation data in the low-pressure area of ​​the material

[0005] (2) The optical measurement method has wide applicability and is more objective and credible in principle, but the equipment is complicated, the test conditions are harsh, and the experimental cost is also high. For the test of the shock insulation line of the chemical explosion method, strict protection of the equipment is required , so it is relatively difficult for field measurement operations

[0006] (3) Most of the measurement methods use a light gas gun to drive the flyer to hit the sample for measurement. Due to the limitation of the driving ability of the light gas gun, the thickness of the general flyer is only 2-5mm, so for materials with large non-uniformity, such as Concrete mortar, etc., cannot be accurately measured; in addition, the light gas gun driving device occupies a large area, is expensive, and the operation is relatively complicated

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