Nonlinear Ultrasonic Mixing Method for Structural Fatigue Crack Direction Detection

A nonlinear ultrasonic and fatigue cracking technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, measuring devices, etc.

Active Publication Date: 2021-01-05
BEIJING UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are few reports in domestic and foreign literature on the use of nonlinear ultrasonic mixing technology to study the direction of fatigue cracks.

Method used

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  • Nonlinear Ultrasonic Mixing Method for Structural Fatigue Crack Direction Detection
  • Nonlinear Ultrasonic Mixing Method for Structural Fatigue Crack Direction Detection
  • Nonlinear Ultrasonic Mixing Method for Structural Fatigue Crack Direction Detection

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Embodiment Construction

[0063]Combine belowFigure 1~Figure 10 Taking the finite element simulation of shear wave mixing and A0 wave mixing detection as an example, the implementation process of nonlinear ultrasonic mixing method for structural fatigue crack direction detection is explained in detail.

[0064]Using Abaqus commercial finite element analysis software, a two-dimensional finite element model of shear wave mixing and a three-dimensional finite element model of A0 wave mixing with fatigue cracks in two arbitrary directions were established respectively, and numerical simulation of shear wave mixing detection and A0 wave mixing detection were performed. The fatigue crack length in the transverse wave mixing simulation model is 15mm and the directions are 23° and 52°; the fatigue crack length in the A0 wave mixing simulation model is 30mm and the directions are 13° and 35°.

[0065](1) Detection of fatigue crack direction of block structure

[0066]The specific implementation steps of the transverse wave mi...

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Abstract

The invention discloses a nonlinear ultrasonic mixing method for testing in the structural fatigue crack direction, and belongs to the field of non-destructive testing. The method comprises the following steps: firstly, according to a tested object and a nonlinear ultrasonic mixing harmonic condition, determining the testing parameters such as the mode, frequency, incident angle and the like of two fundamental frequency waves; performing the nonlinear ultrasonic mixing testing of the structural fatigue crack; performing continuous wavelet transformation on testing signals in each annular receiving point, extracting the amplitudes of mixing waves, and performing the mixing sound field directivity analysis; finally, calculating the fatigue crack direction according to the change rule of thereflecting mixing wave propagation direction along with the fatigue crack direction.

Description

Technical field[0001]The invention relates to a fatigue crack direction nonlinear ultrasonic detection method, in particular to a fatigue crack direction nonlinear ultrasonic mixing detection method based on the sound field directivity of a mixing wave. The method is suitable for detecting the direction of fatigue cracks in block structures and plate structures, and belongs to the field of non-destructive testing.Background technique[0002]Fatigue cracks are one of the main causes of structural failure, and cracks in different directions have different levels of damage to the structure. When the crack direction is perpendicular to the bearing surface of the structure, under the action of alternating loads, even small fatigue cracks can rapidly propagate, leading to structural fracture. Therefore, in order to eliminate safety hazards and ensure the safe and stable operation of equipment, an effective method is urgently needed to detect the direction of early fatigue cracks.[0003]As a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/12G01N29/07G01N29/04
CPCG01N29/041G01N29/07G01N29/12G01N2291/011G01N2291/014G01N2291/023G01N2291/0237G01N2291/0258G01N2291/0289
Inventor 焦敬品吕洪涛吴斌何存富
Owner BEIJING UNIV OF TECH
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