Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate

A bending fatigue, metal plate technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, etc., can solve the problems of undiscovered third-order nonlinear ultrasonic detection and characterization of the fatigue state of metal materials to predict the fatigue life of metal components

Inactive Publication Date: 2015-02-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At present, no method has been found to use third-order nonlinear ultrasonic to detect and characterize the fatigue state of metal materials and predict the fatigue life of metal components.

Method used

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  • Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate
  • Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate
  • Acoustic surface wave high-order nonlinear parameter representation method for bending fatigue state of metal plate

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Embodiment Construction

[0008] figure 1 It is a schematic diagram of the test device for the bending fatigue nonlinear ultrasonic testing system of metal plates, and each part is: metal plate fatigue test device, metal plate, ultrasonic transducer, high-power ultrasonic transceiver, computer, industrial computer, data acquisition card, motion control card Wait. Determine the cycle number, frequency and amplitude of the excitation signal according to the thickness of the metal sheet to be tested. Install the sheet metal on figure 1 On the metal plate fatigue bending test device, the transducer is installed on figure 1 Transducer position, connected to nonlinear ultrasonic testing system.

[0009] When considering a one-dimensional longitudinal wave propagating through a nonlinear medium, in the case of small strains, its equation of motion can be written as:

[0010] ρ ∂ 2 u ∂ ...

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Abstract

The invention aims to provide an acoustic surface wave high-order nonlinear parameter representation method for a bending fatigue state of a metal plate, and the method is used for detecting the bending fatigue state of the metal plate in real time and predicting the bending fatigue life of the metal plate and is widely applied to the fields of aerospace, machinery, traffic, chemical engineering, water conservancy and the like. The method comprises the following steps: determining parameters of an excitation signal according to the surface wave transmission distance and the acoustic velocity of a detected material; emitting a pulse string signal by a high-power ultrasonic transceiver, enabling ultrasonic wave beam to be obliquely incident to the material to generate surface waves, and interacting the surface waves with fatigue defects such as microdefects, micro-plastic deformation or microcracks generated in a bending fatigue process to generate a higher harmonic signal; recording the change of nonlinear parameters every a fixed cycle in a bending fatigue test process, comparing with a standard curve, judging whether a test piece has defects or not, emitting an early warning signal, and predicting the residual bending fatigue life of the metal plate.

Description

1. Technical field [0001] The invention belongs to the field of non-destructive testing technology and metal fatigue, and specifically relates to a surface acoustic wave non-destructive testing method for the bending fatigue state of metal plates, which is a method for detecting fatigue damage of metal components in real time and with high precision using multiple nonlinear parameters and predicting the fatigue life of components . 2. Background technology [0002] The surface acoustic wave high-order nonlinear parameter characterization method of sheet metal bending fatigue state is a non-destructive testing technology that can real-time bend fatigue state of sheet metal and predict the bending fatigue life of sheet metal. During the ultrasonic propagation process, the sound wave interacts with the bending fatigue state of the metal sheet (micro-defects, micro-plastic deformation or micro-cracks), causing the phenomenon of scattering or reflection of the sound wave, generat...

Claims

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Application Information

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IPC IPC(8): G01N29/12
Inventor 徐春广阎红娟肖定国潘勤学蔡海潮宋文涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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