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Ultrasonic relative time propagation technology suitable for inclined crack quantifying and imaging

A relative time and crack technology, which is applied in the field of ultrasonic relative time propagation technology, can solve problems such as difficult to accurately quantify inclined cracks, and achieve the effects of improving quantitative accuracy, good promotion and application prospects

Inactive Publication Date: 2015-06-10
DALIAN UNIV OF TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide an ultrasonic relative time propagation technology suitable for quantification and imaging of oblique cracks, and solve the problem that it is difficult for traditional relative time propagation technology to perform intuitive imaging and accurate quantification and positioning of oblique cracks

Method used

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  • Ultrasonic relative time propagation technology suitable for inclined crack quantifying and imaging
  • Ultrasonic relative time propagation technology suitable for inclined crack quantifying and imaging
  • Ultrasonic relative time propagation technology suitable for inclined crack quantifying and imaging

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Embodiment Construction

[0020] The basic principle of traditional RATT is as follows: figure 1 shown. Depend on figure 1 (a) It can be seen that the phased array probe located on the left side of the crack makes the sound wave enter the workpiece at the incident angle θ through the appropriate time-delay focusing law. The shortest sound path for the sound wave to reach the upper and lower tips of the crack is represented by the line segment AB and the line segment CD. Correspondingly, as figure 1 In the B-scan image shown in (b), the positional relationship of the diffraction echoes at the top and bottom of the crack is determined by the sound paths AB and CD. According to the arrival time τ corresponding to the maximum amplitude point in the diffraction echoes of the upper tip and the lower tip D and τ R , calculate the sound path cτ for the ultrasonic wave to reach the upper tip and lower tip of the crack R / 2 and cτ D / 2, then use figure 1 The geometric relationship in (a), the length δ of...

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Abstract

The invention provides an ultrasonic relative time propagation technology suitable for inclined crack quantifying and imaging, and belongs to the technical field of ultrasonic nondestructive testing. According to the propagation technology, the length, the width, the inclined angle and the position of cracks are set in a two-dimensional section model, a probe with N array elementsis arranged in the model by means of signal parameters of a phased array linear array probe, N2 TXT files representing A scanning signals are formed according to phased array all-capture signal collection, the TXT files are read through software, a TFM image of the cracks is obtained, an upper tip end coordinate point (xR, zR) and a lower tip end coordinate point (xD, zD) on the cracks are found in the image through MATLAB software, and the length delta and the inclined angle gamma of the cracks are calculated. The propagation technology solves the problems that a traditional relative time propagation technology is poor in inclined crack quantifying precision and cannot be used for measuring the inclined angle of the cracks. Besides, by means of the propagation technology, the cracks can be visually imaged and accurately positioned. A solution is provided for further improving quantifying precision of the cracks in workpieces, and good application and popularization prospects are achieved.

Description

technical field [0001] The invention relates to an ultrasonic relative time propagation technology suitable for quantification and imaging of oblique cracks, which solves the problem that traditional relative time propagation technology is difficult to visually image and accurately quantify and locate oblique cracks, and relates to the technical field of ultrasonic nondestructive testing. Background technique [0002] Cracks are one of the most common and most harmful types of defects in materials and structures. Correctly judging the defect characteristics such as the length, orientation and position of the crack is of great significance to the safety evaluation of the workpiece. As an ultrasonic nondestructive testing method, the traditional relative arrival time technique (RATT) has been widely used in the field of defect nondestructive testing and evaluation because of its accurate and excellent vertical crack quantification ability. [0003] However, in the traditional...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N29/06G01N29/44
Inventor 雷明凯赵天伟陈尧张东辉林莉杨会敏罗忠兵严宇周全刘丽丽
Owner DALIAN UNIV OF TECH
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