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Optimization method for probe location during immersion ultrasonic detection of filament winding composite material

A technology of composite materials and optimization methods, applied in measurement devices, analysis materials, material analysis using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as porosity, porosity, and poor resin curing.

Inactive Publication Date: 2012-06-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Due to the unique manufacturing process of composite materials, its defect types are different from traditional materials, mainly including delamination, porosity, porosity, inclusions and poor resin curing.

Method used

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  • Optimization method for probe location during immersion ultrasonic detection of filament winding composite material
  • Optimization method for probe location during immersion ultrasonic detection of filament winding composite material
  • Optimization method for probe location during immersion ultrasonic detection of filament winding composite material

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Embodiment Construction

[0031] The specific implementation steps of the present invention are described in detail below:

[0032] 1) Determine the corresponding parameters of the composite material workpiece to be detected, including thickness T, sound velocity C 复合材料 .

[0033] 2) The reflection method can be used for the detection of near-surface defects. After determining the focusing probe used, calculate its focal area diameter and focal area length according to formulas (2) and (3). The principle of selecting a probe is that its focal area diameter and length should be As small as possible, the detection accuracy and sensitivity will be higher. Determine the value of h (according to the condition of the sound wave penetrating the composite material, to ensure that a clear bottom echo signal can be received), and substitute it into (7) to calculate H, which is the distance from the focusing probe to the workpiece during detection.

[0034] 3) The transmission method detection first ensures tha...

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Abstract

The invention relates to an optimization method for probe location during immersion ultrasonic detection of filament winding composite material. As focusing rules and characteristics of focused transducers in water or the composite material and with different frequencies, wafer diameters and focal lengths are studied, formulas are given respectively for calculating the focal length F, the distance H from the probe to a piece and others when the reflection method and the transmission method are adopted for detection. Therefore the method for the optimization location of the focusing probe is given so as to improve the defect detection accuracy and the sensitivity during the detection and realize reliable detection for work pieces.

Description

1. Technical field [0001] The invention relates to a method for optimizing the position of a focused ultrasonic transducer during liquid immersion ultrasonic testing of composite materials, belonging to the field of nondestructive testing. 2. Background technology [0002] Composite materials have developed into one of the indispensable materials in civil and military fields due to their excellent properties such as high temperature resistance, high specific strength, specific stiffness, oxidation resistance and fatigue resistance. At present, they are not only used in missiles, rockets and artificial satellites. In cutting-edge industries such as automobiles, medical treatment, machinery, electronics, bridges, etc., it is also used in many industries. Due to the unique manufacturing process of composite materials, its defect types are different from traditional materials, mainly including delamination, porosity, porosity, inclusions and poor resin curing. The existence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/22
Inventor 徐春广王洪博夏沙肖定国赵新玉郝娟阎红娟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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