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A method for detecting the depth of micro-cracks on the surface of materials

A detection method, a technology of microcracks, applied in the direction of analyzing materials, using sound waves/ultrasonic waves/infrasonic waves for material analysis, measuring devices, etc.

Active Publication Date: 2018-09-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of detection of micro-cracks on the surface of materials by line-focused ultrasonic transducers, and propose a detection method for crack depth

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  • A method for detecting the depth of micro-cracks on the surface of materials
  • A method for detecting the depth of micro-cracks on the surface of materials
  • A method for detecting the depth of micro-cracks on the surface of materials

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Embodiment Construction

[0024] Step 1): Selection of finite element analysis model material and size parameters.

[0025] Combined with actual and theoretical analysis, it is obtained: in order to increase the bandwidth characteristics of the transducer and improve the energy transmission efficiency, the model selects a 40 μm thick piezoelectric material PVDF film as the excitation / reception element, Tungsten loaded epoxy, 10% vf 5.8Mray1 (tungsten-ring Oxygen resin (referred to as back10) is used as the backing, water is selected as the coupling liquid, and the material of the test piece is aluminum to form a line-focusing transducer model with a transducer focusing radius of 20mm. The material properties are shown in Table 1.

[0026] Table 1 Model material properties

[0027]

[0028] Step 2): Establishment of finite element analysis model.

[0029] Based on PVDF line focused ultrasound transducers, such as figure 1 As shown, the whole piezoelectric film is divided, and the finite element mo...

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Abstract

The invention discloses a material surface micro-crack depth detecting method and belongs to the technical field of non-destructive detection.With constant advancing development of material science, various functional materials constantly emerge, material surface micro-cracks very easily expand under the cyclic loading effect, local material failure is caused, and further the structural overall safety is threatened.The research on the material surface micro-crack depth detecting method has important research significance on material integrity evaluation and has an important application value on structural health safety monitoring.A double-channel line focusing ultrasonic transducer model is established, received signals at different crack depths are analyzed, and the effective method for material surface micro-crack detection is explored.The material surface micro-crack depth detecting method can eliminate the interference of direct reflection echoes of the upper surface of a material to the received signals, facilitates better extraction of defect-related information from the received signals, can detect the surface micro-crack positions of materials and can conduct quantitative characterization on material surface micro-crack depths.

Description

technical field [0001] The invention designs a method for detecting the depth of microcracks on the surface of materials based on PZFlex simulation software. The method is mainly used for the detection of microcrack defects on the surface of small test pieces by a line-focused ultrasonic microscope system, and belongs to the technical field of nondestructive testing. Background technique [0002] With the continuous improvement of our country's science and technology and industrial production level, various new equipment and materials have been developed and put into application. attention. Surface cracks are the surface cracking phenomenon of materials under the action of surface tension. Once a crack appears on the surface of the material, the concentrated stress distributed at the bottom of the surface crack under the external load will promote the rapid growth of the surface crack and eventually lead to the scrapping of the material, resulting in irreparable losses. fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B17/00G01N29/04
CPCG01B17/00G01N29/048
Inventor 宋国荣肖珍秦登千吕炎卢东邢智翔何存富吴斌
Owner BEIJING UNIV OF TECH