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A Method for Calibrating Acoustoelastic Coefficients of Explosive Residual Stress Ultrasonic Testing Method

A residual stress, ultrasonic testing technology, applied in the direction of force/torque/work measuring instrument, force/torque/work measuring instrument calibration/test, measuring device, etc. The effect of accurate coefficient, good linear fit and accurate residual stress

Active Publication Date: 2020-11-06
杭州戬威科技有限公司
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Problems solved by technology

However, due to the particularity of explosive samples, factors such as the sequence of steps and calculation methods in the calibration process have a great influence on the calibration curve, the current calibration of the standard sample's acoustoelastic coefficient still needs to be improved.

Method used

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  • A Method for Calibrating Acoustoelastic Coefficients of Explosive Residual Stress Ultrasonic Testing Method
  • A Method for Calibrating Acoustoelastic Coefficients of Explosive Residual Stress Ultrasonic Testing Method
  • A Method for Calibrating Acoustoelastic Coefficients of Explosive Residual Stress Ultrasonic Testing Method

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Embodiment Construction

[0053] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0054] A method for calibrating the acoustoelastic coefficient of an explosive residual stress ultrasonic detection method, using an ultrasonic stress meter and a digital material testing machine, the digital material testing machine has a good load-holding capacity (that is, keeps a constant load within a certain period of time), specifically including the following step:

[0055] Step 1: Turn on the ultrasonic stress meter and digital material testing machine for 30 minutes to preheat; preheat the instrument before calibration, the temperature will gradually rise after the instrument is started, until it reaches a stable temperature, although the instrument has a built-in fi...

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Abstract

The invention relates to the field of explosive acoustoelastic coefficient detection, and specifically relates to an acoustoelastic coefficient calibration method of an explosive residual stress ultrasonic detection method. Firstly, an acoustoelastic coefficient of a standard sample is calibrated, a calibration curve of load-acoustic time difference is made, and in follow-up residual stress measurement for the explosive, load (namely the residual stress) of the explosive can be obtained corresponding to the calibration curve as long as the acoustic time difference of the explosive is measured.By the method provided by the invention, the measured acoustic time difference-load curve of the standard sample has excellent degree of linear fitting, and the measured explosive residual stress isaccurate.

Description

technical field [0001] The invention relates to the field of explosive residual stress detection, in particular to an acoustoelastic coefficient calibration method of an explosive residual stress ultrasonic detection method. Background technique [0002] Polymer Bonded Explosives (PBX for short) is an important class of high-energy explosives composed of high-energy elemental explosives and polymer binders. PBX is formed by hot pressing of molding powder. During the forming process, due to the external pressure, different degrees of elastic-plastic deformation occur. After the pressure is removed, a certain amount of elastic strain energy will be accumulated, resulting in residual stress. It can be said that residual stress is a kind of PBX. Intangible defects. However, PBX is significantly affected by environmental factors such as temperature and stress during use, and is sensitive to strong external stimuli. Therefore, it is of great theoretical and practical significance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L25/00G01L5/00
CPCG01L5/0047G01L25/00
Inventor 杨雪梅付诚孙新方文平刘日明
Owner 杭州戬威科技有限公司
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