A method for optimizing the delay law of phased array ultrasonic testing wafers of fiber-reinforced resin matrix composites
A fiber-reinforced resin and composite material technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as reducing detection quantification, positioning accuracy, affecting sound beam deflection and focusing, and affecting ultrasonic wave propagation, etc., to improve the sound beam. Focusing effect, accurate inspection results, optimized wafer delay law effect
Active Publication Date: 2017-08-25
DALIAN UNIV OF TECH
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Problems solved by technology
However, the existing detection instruments all default the detection material as an isotropic medium, so as to calculate the delay law of the wafer
This is not suitable for laminated fiber-reinforced resin-based composite material specimens, because the elastic anisotropy of the material will significantly affect the propagation of ultrasonic waves, thereby affecting the deflection and focusing of the sound beam, and reducing the quantitative and positioning accuracy of detection.
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[0030] (1) Measuring the material properties of CFRP samples
[0031] For a laminated CFRP sample with a thickness of 15mm, the density was measured by the Archimedes method, and the result was 1.56g / cm 3 ;Using the direct contact method and using the pulse reflection technique (5MHz conventional ultrasonic probe) to measure the sound velocity of the longitudinal wave on the surface of the vertical sample is 2844m / s, using the self-reference body wave method to measure the same process as the CFRP sample material and the laying angle is 0 The elastic stiffness matrix (unit GPa) of the unidirectional belt at the angle of
[0032]
[0033] Then the CFRP sample was cut, polished, and polished, and the fiber orientation characteristics of different layers of the CFRP sample were observed through a metallographic microscope. figure 1 It is a macroscopic metallographic photo of a CFRP sample. The measured layer thickness is 0.125mm, and the number of layers is 120 according to t...
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Abstract
The invention discloses a fiber reinforced resin-based composite material phased array ultrasonic testing wafer delay law optimization method, and belongs to the technical field of ultrasonic detection. The fiber reinforced resin-based composite material phased array ultrasonic testing wafer delay law optimization method comprises following steps: density, longitudinal wave velocity, and elastic stiffness matrix of samples are obtained; material isotropic ultrasonic testing models are established, and anisotropic ultrasonic testing models are established by taking fiber arrangement directions into consideration; the isotropic ultrasonic testing models are used for calculating phased array ultrasonic testing wafer delay so as to obtain wafer delay laws used in practical detection; and the wafer delay laws are optimized based on corresponding wafer delay calculated based on the anisotropic ultrasonic testing models. The fiber reinforced resin-based composite material phased array ultrasonic testing wafer delay law optimization method is disclosed based on acoustic modeling; influences of material anisotropy on sound propagation are taken into consideration; sound-beam focusing effect is improved; and support is provided for study on sound propagation laws in fiber reinforced resin-based composite materials, improvement of detection technology, and increasing of defect detecting capability.
Description
technical field [0001] The invention relates to a method for optimizing the delay law of a fiber-reinforced resin-based composite material phased array ultrasonic detection wafer, and belongs to the technical field of ultrasonic detection. Background technique [0002] Phased array ultrasonic testing has the advantages of high detection sensitivity, high detection efficiency, and imaging and recording, and has been widely used in the quality inspection of fiber-reinforced resin matrix composite material specimens. The key lies in controlling the time delay of each piezoelectric chip, electronically controlling the deflection or focusing of the sound beam, and then obtaining a good detection effect in the inspected area. This is very beneficial for the situation where there is a certain horizontal distance between the probe and the detection position, and the sound beam enters the test piece obliquely. However, the existing detection instruments default the detection materia...
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IPC IPC(8): G01N29/06
Inventor 罗忠兵林莉周伯堃曹欢庆苏慧敏金士杰
Owner DALIAN UNIV OF TECH