A method for identifying crack direction
A crack and polarization direction technology, which is applied in the field of ultrasonic testing and imaging, can solve the problems of not being able to identify the direction of cracks, and it is difficult to detect cracks.
Active Publication Date: 2019-06-04
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology
In the current ultrasonic inspection, the direction of the incident sound beam is set according to the possible distribution direction of cracks to achieve effective detection. However, the direction of the incident sound beam is often limited by some conditions and cannot be changed arbitrarily, so it is difficult Detect cracks in certain directions, let alone identify the direction of cracks
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[0032] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0033] In the description of the present invention, it should be noted that the terms "first", "second", "third" and so on are only used to distinguish descriptions, and should not be understood as indicating or implying relative importance.
[0034] figure 1 It is a schematic flowchart of a method for identifying a crack direction provided by an embodiment of the present invention. Such as figure 1 As shown, the method includes steps S10-S60:
[0035] S10, preset a focus at any position on the area to be detected, and the multi-wave sound field is focused on the preset focus.
[0036] figure 2 A schematic diagram of crack direction detection provided by the embodiment of the present invention, such as figure 2 As shown, suppose an ultrasonic transducer array with N array elements is located on the surface of a ...
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The invention relates to a method for identifying a crack direction. The method comprises the following steps: presetting a focal point on any position in an area to be detected, and focusing a multi-wave sound field on the preset focal point; controlling a sound field polarization direction on the preset focal point to enable the sound field polarization direction to be in a preset direction; constantly changing the preset direction to enable the sound field polarization direction on the focal point to rotate in a range of 0-360 degrees, and recording crack echo signals in different sound field polarization directions; processing the crack echo signals to obtain a multi-wave detection total crack echo signal; on the basis of the amplitude of the total crack echo signal, identifying the crack direction; changing the position of the focal point of the sound field, repeating the above processing processes, and detecting the growing direction of the whole crack. By use of the above steps and method, under a situation that the positions of an incident sound beam and the focal point are not changed, the polarization direction of the found field on the focal point is controlled to detect the crack direction.
Description
technical field [0001] The invention relates to the technical field of ultrasonic detection and imaging, in particular to a method for identifying the direction of a crack. Background technique [0002] The stress accumulated on the surface of the material tends to form very small surface cracks or sub-surface cracks on the surface of the material, the width of which can be as small as microns. These extremely small cracks hidden on the surface or sub-surface of materials and structural parts will continue to grow under the action of stress or environment (or both), which will significantly deteriorate the mechanical properties of the workpiece, and if the crack is thicker along the thickness of the workpiece If the thin direction expands to a certain extent, it will cause the fracture of the workpiece. At the same time, because of its small size, it is usually more concealed and dangerous than visible cracks. Therefore, in order to achieve early warning of the safety of m...
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IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/44
Inventor 阎守国黄娟张碧星
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI