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Nondestructive testing method for thickness of adhesive film of honeycomb sandwich structure

A technology of honeycomb interlayer and non-destructive testing, which is applied to measuring devices, instruments, and the use of ultrasonic/sonic/infrasonic waves, etc., can solve problems such as measurement, and achieve the effect of easy operation and simple detection methods

Active Publication Date: 2021-01-29
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the present invention: the present invention aims at the problem that the thickness of the adhesive film between the skin and the honeycomb in the honeycomb sandwich structure composite material cannot be directly measured by physical methods and anatomical metallographic methods, and proposes to measure the thickness of the adhesive film by using a non-destructive testing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Detect the thickness of the adhesive film between the skin and the honeycomb of a carbon fiber honeycomb sandwich structure. The skin is T700 carbon fiber material with a thickness of 2mm, and the honeycomb is NOMEX honeycomb with a thickness of 25mm. Prepare two pieces of the same structure and material as the honeycomb sandwich structure to be tested. Comparing the comparison test block, the thickness of the adhesive film between the first skin of the comparison test block and the honeycomb is 0.3mm, and the thickness of the adhesive film between the second skin of the comparison test block and the honeycomb is 1.5mm. Using a 5MHz contact ultrasonic probe, the detection sensitivity is to adjust the height of the reflection signal wave of the debonding defect between the skin and the film in the comparison test block 1 to 80% of the full scale of the ultrasonic flaw detector, keep the detection sensitivity unchanged, and move the probe to the contrast For the good part ...

Embodiment 2

[0054] Detect the thickness of the adhesive film between the skin and honeycomb of a carbon fiber honeycomb sandwich structure. The skin is T300 carbon fiber material with a thickness of 3mm, and the honeycomb is NOMEX honeycomb with a thickness of 40mm. Prepare two pieces of the same structure and material as the honeycomb sandwich structure to be tested. Compared with the comparison test block, the thickness of the adhesive film between the first skin of the comparison test block and the honeycomb is 0.4mm, and the thickness of the adhesive film between the second skin of the comparison test block and the honeycomb is 2mm. Using a 5MHz contact ultrasonic probe, the detection sensitivity is to adjust the height of the reflection signal wave of the debonding defect between the skin and the film in the comparison test block 1 to 80% of the full scale of the ultrasonic flaw detector, keep the detection sensitivity unchanged, and move the probe to the contrast For the good part of...

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Abstract

The invention discloses a nondestructive testing method for the thickness of an adhesive film of a honeycomb sandwich structure, and belongs to the field of nondestructive testing. The nondestructivetesting method adopts an ultrasonic longitudinal wave direct incidence pulse reflection method for detection, and comprises the steps that: firstly, two honeycomb sandwich structure reference test blocks of different adhesive film thicknesses are adopted for calibrating equipment, and reflection echoes of the positions of the adhesive films of the test blocks of different adhesive film thicknessesare recorded respectively; secondly, a detected honeycomb sandwich structure part is detected; and thirdly, the thickness of a detected adhesive film is judged according to the position characteristics of the reflected signal of the adhesive film of the detected honeycomb sandwich structural member. The nondestructive testing method is adopted to measure the thickness of the adhesive film in theworkpiece, the workpiece does not need to be damaged, the detection method is simple and convenient and easy to operate, and the accuracy of the detection result can meet the requirements of materialmanufacturers.

Description

technical field [0001] The invention relates to a non-destructive testing method for the thickness of an adhesive film of a honeycomb sandwich structure, which belongs to the technical field of non-destructive testing. Background technique [0002] Honeycomb sandwich structure composite material is a commonly used composite material part structure form in military aircraft. This structure is formed by bonding the upper and lower skins and the honeycomb through the adhesive film. In some cases, it is necessary to measure the thickness of the adhesive film between the skin and the honeycomb. Since the adhesive film is included between the skin and the honeycomb after the honeycomb sandwich structure is cured and formed, its size cannot be directly measured by conventional physical methods. , and the metallographic measurement by anatomical method will damage the workpiece. Therefore, the present invention attempts to measure the thickness of the internal adhesive film by usin...

Claims

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Application Information

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IPC IPC(8): G01B17/02
CPCG01B17/02
Inventor 王铮何方成史丽军王晓杨平华权鹏冯克
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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