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Method for detecting bevel surface cracking inclination angle and depth

A technology for surface cracks and inclination angles, applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., to achieve accurate inclination angles and depths, and accurate measurements

Active Publication Date: 2016-06-22
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a kind of accurate detection method of bevel surface crack inclination angle and depth in order to solve the detection problem of bevel surface crack feature (comprising inclination angle and depth) in the material

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  • Method for detecting bevel surface cracking inclination angle and depth
  • Method for detecting bevel surface cracking inclination angle and depth
  • Method for detecting bevel surface cracking inclination angle and depth

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Embodiment Construction

[0031] Below in conjunction with specific example the content of the present invention is described in further detail:

[0032] Step 1): Establish the formula for calculating the inclination angle and depth of the beveled surface crack

[0033] The working mode is that the transducer excites the ultrasonic signal, propagates to the upper surface of the test piece through the coupling agent water, refracts on the upper surface of the test piece and propagates to the crack on the oblique surface, is reflected by the crack on the oblique surface and returns to the piezoelectric film to be replaced. can be received by the transducer itself. figure 1 The black thick solid line with the arrow in the middle is the propagation path of the echo reflected by the oblique surface crack received by the transducer. When the transducer moves Δz along the X-axis direction, the propagation distance of the sound wave in the water remains unchanged, and the time change of the reflected echo rec...

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Abstract

A method for detecting bevel surface cracking inclination angle and depth is provided.Surface cracking are in two forms, vertical surface cracking and bevel surface cracking, and the two forms of surface cracking are generally present in practical industrial structures.Surface cracking may be in an open state, a closed state or in a state between them, this makes ultrasonic detection more difficult and detection result reliability reduced.The invention aims to provide a detection, wherein according to bevel surface cracking characteristics of a test piece, a linear focusing ultrasonic transducer is used to perform horizontal step measurement to determine a propagation path of bevel surface cracking reflected echo, so that the transducer may measure inclination angle and depth of bevel surface cracking in the test piece more accurately.The method has the following advantages that inclination angle and depth of bevel surface cracking in the test piece is accurately measured; no destruction is caused to the test piece structure.

Description

technical field [0001] The invention belongs to the field of ultrasonic nondestructive testing, and in particular relates to a method for detecting the inclination angle and depth of an oblique surface crack. Background technique [0002] The non-destructive detection of cracks has always been an important topic in industrial applications and scientific research, especially surface cracks, which are highly harmful to structural safety due to their high probability of occurrence. Therefore, it is necessary to develop a scientific and reliable method and technology to realize surface cracks. The detection and measurement of the crack depth have been the goals of the academic circles for a long time. There are two forms of surface cracks, one is vertical surface cracks, the other is oblique surface cracks, both of which are common in actual industrial structures. Surface cracks can be in different states of open, closed or in between, which increases the difficulty of ultrason...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/07G01B17/00
CPCG01B17/00G01N29/041G01N29/07G01N2291/011G01N2291/023G01N2291/0421
Inventor 宋国荣秦登千肖珍吕炎洪广富徐煜阳何存富吴斌
Owner BEIJING UNIV OF TECH
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