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Method for testing residual stress of ultrasonic composite material with coupling agent

A composite material and residual stress technology, applied in the direction of force/torque/work measuring instrument, measuring device, instrument, etc., can solve the problem that the residual stress of the plate cannot be evaluated

Active Publication Date: 2020-12-11
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] According to the current way of using the ultrasonic scanning microscope, for complex composite material plates, it is generally used to detect the debonding defect of the material after impact, but the residual stress of the plate cannot be evaluated

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  • Method for testing residual stress of ultrasonic composite material with coupling agent
  • Method for testing residual stress of ultrasonic composite material with coupling agent
  • Method for testing residual stress of ultrasonic composite material with coupling agent

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Embodiment Construction

[0030] The following are preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also considered as the present invention. protection scope of the invention.

[0031] The invention provides a method for testing the residual stress of an ultrasonic composite material with a couplant, comprising the following steps:

[0032] S1: Cut the composite material into a tensile sample, place the sample on the stage of an ultrasonic scanning microscope with a frequency of 5-100MHz, lower the probe and move it to the center of the sample surface to be tested, and adjust the position of the probe on the Z axis;

[0033] S2: During the test, it is necessary to place the sample in a liquid couplant such as water, adjust the energy, attenuation, signal gain or impedance of the sound...

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Abstract

The invention provides a method for testing residual stress of an ultrasonic composite material with a coupling agent, and relates to the technical field of nondestructive testing of composite materials. The method comprises the following steps of: manufacturing a tensile sample, selecting a detection position, selecting an ultrasonic scanning microscope probe with proper frequency, adjusting a digital threshold and gain to obtain a waveform, acquiring acoustic time difference data, calculating an acoustic elastic stress coefficient K, detecting an impact sample, determining defects, detectingoscillograms at different positions, and calculating the internal residual stress according to a formula. According to the detection method provided by the invention, the layering and defects of thecomposite material can be detected by virtue of a CScan scanning mode, the positions and shapes of the layering and defects in the material can be determined, and meanwhile, the residual stress distribution in the composite material can be tested and calculated, so that a powerful support is provided for the quality evaluation of the composite material.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of composite materials, in particular to an ultrasonic composite material residual stress testing method with coupling agent. Background technique [0002] Carbon fiber reinforced resin-based composites have the advantages of light weight, strong performance, heat resistance and corrosion resistance, and meet the performance requirements of aerospace vehicles. In recent years, they have been widely used in the aerospace field. Since the manufacture and processing of composite components are usually in high temperature and high pressure environment, a series of complex physical and chemical changes occur, so that a certain amount of residual stress will inevitably form inside the component. In addition, during the use of composite materials, certain stresses will also be generated due to the existence of various loads. When the residual stress or local stress of the composite mater...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/0047Y02P10/20
Inventor 高玉魁罗军明李建坤
Owner NANCHANG HANGKONG UNIVERSITY
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