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Method for measuring inner stress in pouring explosive solidification process

A technology of internal stress and measurement method, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of harsh environmental requirements, high test cost, inability to measure the internal stress of materials in real time, etc., and achieve the effect of reducing the test cost.

Inactive Publication Date: 2013-09-25
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The test objects are all formed materials, and the internal stress of the material during the curing process cannot be measured in real time
[0006] (2) The above-mentioned stress measurement process involves a lot of precision control instruments, which has strict requirements on the laboratory environment and high test cost.

Method used

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  • Method for measuring inner stress in pouring explosive solidification process
  • Method for measuring inner stress in pouring explosive solidification process
  • Method for measuring inner stress in pouring explosive solidification process

Examples

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Embodiment 1

[0072] Following the technical scheme of the present invention, in the present embodiment, curing container 2 has a diameter of 30cm, length 40cm, and wall thickness 3.0cm; test tube 4 has a length of 15cm, a nozzle diameter of 2cm, and a tube wall thickness of 2m; temperature sensor 7 adopts an armored thermocouple ; Strain gauge 8 adopts 120Ω BB120-44A (11) 250 high temperature strain gauge; strain amplifier 10 adopts YE3818 dynamic strain gauge. In this example, the stress of a certain point in the explosive is measured during the curing process of 500ml cast PBX explosive, wherein the curing temperature is a constant temperature of 60°C, and the strain gauge adopts the half-bridge method, using two strain gauges, and one strain gauge is used as the strain gauge of the explosive Measurement, another strain gauge is used as a temperature compensation plate to eliminate the influence of temperature changes on the accuracy of strain measurement. Stick the strain gauges for str...

Embodiment 2

[0076] This embodiment provides the stress measurement at any point inside the explosive column in the same explosive solidification process as in Example 1. The measuring instruments and measurement methods used are exactly the same, and the difference is that the present embodiment adopts a temperature-variable curing method to carry out 500ml pouring PBX explosive solidify. The variable temperature curing method starts from 120°C for 5 hours at high temperature, then drops the temperature at 0.5°C / min to 60°C for 10 hours at a constant temperature, and then drops to 30°C at 0.5°C / min for 5 hours. The obtained stress-time curve and curing temperature-time curve of the curing process are as follows image 3 shown.

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Abstract

The invention discloses a method for measuring inner stress in a pouring explosive solidification process. The method comprises the following steps that a strain gage is adhered to the inner wall of a testing tube; a temperature sensor is fixed on the testing tube; the testing tube is fixed inside a solidification container; the temperature sensor is connected with a temperature compensation cable, and the strain gage is connected with a coaxial data cable; pouring explosives to be solidified are injected in the solidification container which is provided with the testing tube until the solidification container is full; the solidification container is sealed and placed in a temperature controllable oven; the temperature compensation cable is connected with a temperature signal adapter, and the coaxial data cable is connected with a strain amplification device; the strain amplification device and the temperature signal adapter are connected with a data collecting device; the data collecting device collects data in real time, and the collected data are converted into a strain - time curve and a temperature - time curve. According to the method for measuring the inner stress in the pouring explosive solidification process, the solidification container is sealed, and the variation of the inner stress of the pouring explosives can be measured and recorded in real time in the solidification process at different solidification temperatures.

Description

technical field [0001] The invention belongs to the technical field of propellants and explosives, and in particular relates to a method for measuring internal stress during the solidification process of pouring explosives. The method is used for real-time measurement of internal stress and stress distribution during the solidification process of pouring explosives at different temperatures. Background technique [0002] During the curing process of pouring explosives, stress changes will occur inside the grain, which will affect the integrity and mechanical properties of the explosive grain structure, especially during the cooling and curing process, the inside of the grain is extremely It is easy to generate internal stress concentration, destroying its structural integrity, and directly affecting the launch and overload safety of the charge. According to the observation of the fracture morphology of cast explosives under different impact loading conditions, it is found th...

Claims

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Application Information

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IPC IPC(8): G01L1/22
Inventor 冯晓军王晓峰徐洪涛陈春燕高立龙田轩封雪松冯博张建雄
Owner XIAN MODERN CHEM RES INST
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