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A Method of Nonlinear Ultrasonic On-line Monitoring of Metal Material Strain Variation

A non-linear ultrasonic and metal material technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the problems of high equipment cost and complicated detection methods, and achieve the effect of solving high costs and reducing risks

Active Publication Date: 2019-01-22
ZHONGBEI UNIV
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Problems solved by technology

It can be seen that the existing strain change measurement technology is mainly concentrated in the optical field, the detection method is complicated and the equipment cost is high

Method used

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  • A Method of Nonlinear Ultrasonic On-line Monitoring of Metal Material Strain Variation
  • A Method of Nonlinear Ultrasonic On-line Monitoring of Metal Material Strain Variation
  • A Method of Nonlinear Ultrasonic On-line Monitoring of Metal Material Strain Variation

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Embodiment Construction

[0042] The invention provides a device for nonlinear ultrasonic on-line monitoring of strain changes of metal materials, which is divided into an on-line strain detection part of metal materials, an acoustic wave emitting and receiving part, and a processing for receiving nonlinear ultrasonic parameters.

[0043] Step 1: In order to verify this method, make a piece of LY12 aluminum alloy plate whose length*width*height is 20*4*1 (unit: cm), such as figure 1 As shown, the circle in the middle of the specimen is where the probe is placed. Such as figure 1 shown.

[0044] Table 1 Parameters of LY12 aluminum alloy specimens

[0045]

length (cm)

width (cm)

height (cm)

P-wave velocity (m / s)

Shear wave velocity (m / s)

Specimen

20

4

1

6345.85

2365.82

[0046] Step 2: Fix the two ends of the plate and hang a heavy object in the middle to produce certain fatigue. A support frame for online strain monitoring is made on the plat...

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Abstract

The present invention discloses a non-linear ultrasonic on-line monitoring metal material strain changing method, belonging to the metal material fatigue damaging analysis technology field. A probe is arranged at the middle portion of a piece to be tested, two ends of the piece to be tested are fixed, a weight is hung at the middle portion of the piece to be tested, and the gravity of the weight is employed to generate stretching for the piece to be tested to generate fatigue. A support frame for monitoring strain on line is made on the piece to be tested, and the support frame is internally provided with an ultrasonic energy transducer. The high energy pulse signal output end of a nonlinear acoustics detection device performs interaction with the ultrasonic transducer through 50 Ohm impedance matching and a duplexer to receive reflected supersonic wave signals through reflection of the piece to be tested. The non-linear ultrasonic on-line monitoring metal material strain changing method can realize online monitoring of the metal materials to estimate in-service workpiece mechanics status under external load long-term effect so as to reduce the engineering project risk caused by metal workpiece fracture failure, solve defects of high cost and complex operation of a current device and have business application and popularization values.

Description

technical field [0001] The invention relates to a method for nonlinear ultrasonic on-line monitoring of strain changes of metal materials, belonging to the technical field of fatigue damage analysis of metal materials. Background technique [0002] The metal material components that play an important supporting and protective role in industrial production and daily life, the external long-term load and harsh environment lead to continuous degradation of mechanical properties, in which the change of material strain is particularly obvious, so it can be used for metal components during service The monitoring of material strain enables the evaluation of metal mechanical properties. [0003] The application of non-destructive testing technology in the fatigue testing of metal materials is also very common. The commonly used testing methods include infrared testing, eddy current testing, microwave testing, electromagnetic acoustic emission testing and other methods. Ultrasonic n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B17/04
CPCG01B17/04
Inventor 李海洋王召巴高翠翠潘强华肖雨
Owner ZHONGBEI UNIV
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