Micro-crack nondestructive detection system and detection method thereof

A non-destructive testing and micro-crack technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problem of insignificant changes, and achieve the effects of improving sensitivity, convenient use and high detection efficiency.

Active Publication Date: 2015-03-11
HUNAN INSTITUTE OF ENGINEERING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

These linear parameters do not change significantly when the damage size is small or a closed crack, so conventional linear ultrasonic methods cannot reliably detect these defects

Method used

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  • Micro-crack nondestructive detection system and detection method thereof
  • Micro-crack nondestructive detection system and detection method thereof
  • Micro-crack nondestructive detection system and detection method thereof

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. see figure 1 , the nondestructive testing system for microcracks of the present invention includes a signal generator 1, a low-frequency exciter 2, a high-frequency exciter 3, a member under test 4, a piezoelectric sensor 5, a preamplifier 6, and a signal acquisition and analysis system 7; the signal generator 1. The low frequency exciter 2 and the high frequency exciter 3 are electrically connected to the measured component 4. The piezoelectric sensor 5 is fixed on the measured component 4 through an adhesive. The signal acquisition and analysis system 7 communicates with the piezoelectric sensor through the preamplifier 6 The sensor 5 is electrically connected; the signal generator 1 can simultaneously output two simple harmonic excitation signals with different frequencies. The signal acquisition and analysis system 7 includes a signal acqui...

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Abstract

The invention discloses a micro-crack nondestructive detection system and a detection method thereof. The micro-crack nondestructive detection system comprises a signal generator, a low frequency vibration exciter, a high frequency exciter, a detected member, a piezoelectric sensor, a preamplifier and a signal acquisition and analysis system; the signal generator is electrically connected with the detected member through the low frequency vibration exciter and the high frequency exciter, the piezoelectric sensor is fixed on the detected member through an adhesive, and the signal acquisition and analysis system is electrically connected with the piezoelectric sensor through the preamplifier; and the signal-generator can simultaneously output two paths of simple harmonic excitation signals with different frequencies. Defect detection is carried out by using the non-linear modulation effect of a crack structure under multi-frequency excitation, and whether the existence or not of the micro-crack and the micro-crack damage of the detected member are directly determined according to the quantity and amplitude of side frequencies in a response spectrum without complex signal processing, so the system and the method have the advantages of use convenience, sensitive detection and high detection efficiency.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection, and in particular relates to a micro-crack non-destructive detection system and a detection method based on the nonlinear modulation response effect under multi-frequency simple harmonic excitation. Background technique [0002] Fatigue cracks are one of the main ways of structural damage. It is of great significance to develop real-time and reliable early nondestructive detection methods for structural fatigue cracks to avoid accidents caused by fatigue cracks. At present, scholars at home and abroad have proposed many non-destructive testing methods for structural cracks, such as acoustic emission method, eddy current method, vibration-based method and ultrasonic testing technology. [0003] Ultrasound is an important non-destructive testing method. When it propagates in the structure, it causes the vibration of the material itself. The discontinuity or inhomogeneity of the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 魏克湘耿晓峰邹鸿翔宁立伟
Owner HUNAN INSTITUTE OF ENGINEERING
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