Nonlinear ultrasonic detection method for residual stress

A nonlinear ultrasonic and residual stress technology, used in force/torque/work measuring instruments, measuring forces, measuring devices, etc., can solve the problems of complex operation, high working condition requirements, and inability to monitor the stress change of metal materials.

Inactive Publication Date: 2018-06-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Although this method realizes on-line monitoring of the stress change of metal materials, it needs to hang a heavy object in the middle of the test piece and can only monitor by receiving the reflected ultrasonic signal. Ultrasonic signals monitor stress changes in metallic materials

Method used

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  • Nonlinear ultrasonic detection method for residual stress
  • Nonlinear ultrasonic detection method for residual stress
  • Nonlinear ultrasonic detection method for residual stress

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Embodiment Construction

[0014] The following is a detailed description of the residual stress nonlinear ultrasonic testing method:

[0015] 1. Residual stress nonlinear ultrasonic detection system should have at least the following functions: frequency setting, ultrasonic excitation voltage control, high and low pass filtering, ultrasonic receiving gain control, harmonic analysis algorithm, signal time position display and calculation of residual stress value. A block diagram of a typical nonlinear ultrasonic testing system, such as figure 1 shown.

[0016] 2. The internal residual stress of material components is a three-dimensional vector with position (or depth), magnitude and direction. In order to meet the needs of residual stress detection in different directions, the residual stress nonlinear ultrasonic detection is divided into the following four methods: Residual stress nonlinear ultrasonic Oblique incidence detection method, residual stress nonlinear ultrasonic reflection detection method...

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Abstract

The invention relates to a nonlinear ultrasonic detection method for residual stress, and is applicable to the field of ultrasonic non-destructive detection. Internal residual stress of a component can be detected in a non-contact manner through water coupling or air coupling by using corresponding relations between ultrasonic two-order and three-order nonlinear coefficients and the residual stress. A research and a test show that the method has a correct theoretical basis, a feasible technical solution, an effective implementation process and a reliable and repetitive detection result, so that a fundamental need for quick and non-destructive detecting internal residual stress of a large-size component is fundamentally met.

Description

1. Technical field [0001] The invention belongs to the field of ultrasonic testing, and relates to a nonlinear ultrasonic testing method for residual stress, which is suitable for rapid scanning of residual stress distribution inside components. 2. Background technology [0002] The mechanism of nonlinear ultrasonic testing of components is to use the ultrasonic wave to propagate in the component, interact with the internal structure of the material, distort the ultrasonic waveform and generate high-order harmonic components, and use the sensitivity of nonlinear ultrasonic characteristic parameters to material micro-defects The degree characterizes the nonlinear characteristics of the material, so as to realize the detection of the residual stress of the component. [0003] In the existing residual stress detection methods, according to whether the component is damaged or not, it is divided into three categories: damaged, semi-damaged and non-damaged. The damaged methods inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25G01L5/00
CPCG01L1/255G01L5/0047
Inventor 徐春广贺蕾王秋涛李培禄卢钰仁潘勤学周世圆肖定国郝娟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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