Nonlinear circumferential ultrasonic wave guiding method for damage evaluation of metal round tube

A technology of ultrasonic guided wave and nonlinear acoustic parameters, which is applied in the direction of analyzing solids, instruments, and analysis materials by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems of high detection cost, economic loss, slow detection speed, etc., and achieve high detection accuracy High, low detection cost, fast detection effect

Inactive Publication Date: 2016-12-07
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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Problems solved by technology

The metal round tube will be affected by various external factors in the actual use process. These external factors will act on the metal round tube repeatedly for a long time, which will lead to changes in its mechanical and physical properties, and then make the potential inside the metal round tube Cracks appear at the defect and break, causing major accidents and causing huge economic losses. Therefore, it is particularly necessary and urgent to effectively evaluate the damage state of the circular tube structure.
[0003] The principle of traditional ultrasonic (includi

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  • Nonlinear circumferential ultrasonic wave guiding method for damage evaluation of metal round tube
  • Nonlinear circumferential ultrasonic wave guiding method for damage evaluation of metal round tube
  • Nonlinear circumferential ultrasonic wave guiding method for damage evaluation of metal round tube

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Embodiment Construction

[0025] The present invention will be further described in a non-limiting manner in conjunction with examples.

[0026] The present invention provides a nonlinear circumferential ultrasonic guided wave method for damage evaluation of metal circular pipes, comprising the following steps:

[0027] S1 calculates the phase velocity dispersion curve according to the physical parameters and geometric parameters of the metal circular tube specimen to be tested;

[0028] S2 According to the phase velocity dispersion curve in step S1, select the corresponding fundamental frequency circumferential ultrasonic guided wave as the detection excitation, and determine the corresponding excitation frequency and excitation phase velocity from the detection excitation;

[0029] S3 couples the outer surface of the metal circular tube test piece with the fundamental frequency ultrasonic transducer and the second harmonic transducer, and determines the fundamental frequency ultrasonic transducer and...

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Abstract

The invention provides a nonlinear circumferential ultrasonic wave guiding method for damage evaluation of a metal round tube. The nonlinear circumferential ultrasonic wave guiding method comprises the following steps of calculating a phase velocity dispersion curve according to physical parameters and geometric parameters of a metal round tube specimen to be measured; fatigue loading: loading to a scheduled cycle according to a scheduled plan to obtain a normalization value beta; repeatedly loading until fatigue loading is performed on a final scheduled cycle, and measuring a relation curve that a nonlinear acoustic parameter beta of circumferential ultrasonic wave guiding changes along with a load cycle index M; obtaining a damage degree under given loading conditions according to the beta-M relation curve. The nonlinear circumferential ultrasonic wave guiding method provided by the invention has the beneficial effects that a whole round tube member is covered by adopting nonlinear circumferential ultrasonic wave guiding detection, so that a damage state of round tube members/materials is effectively detected and evaluated, and a reliable reference is provided for safe use of the round tube members/materials; the nonlinear circumferential ultrasonic wave guiding method has the advantages of high detection speed, low detection cost and high detection accuracy.

Description

technical field [0001] The invention relates to a method for evaluating the damage of a metal circular pipe, in particular to a nonlinear circumferential ultrasonic guided wave method for evaluating the damage of the metal circular pipe. Background technique [0002] Metal round tubes have been widely used in practical engineering fields due to their excellent mechanical properties. The metal round tube will be affected by various external factors in the actual use process. These external factors will act on the metal round tube repeatedly for a long time, which will lead to changes in its mechanical and physical properties, and then make the potential inside the metal round tube Cracks appear at the defect and break, causing major accidents and causing huge economic losses. Therefore, it is particularly necessary and urgent to effectively evaluate the damage state of the circular tube structure. [0003] The principle of traditional ultrasonic (including ultrasonic guided ...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/023G01N2291/262
Inventor 邓明晰高广健李明亮
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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