The Correlation Between Strength Characteristics, Porosity and Ultrasonic Testing Data for FRP Specimens Made With Autoclave and Infusion Technologies

Dikov, I.A.; Boychuk, A.S.; Dalin, M. A.; Chertishchev, V. Yu.; Generalov, A. S.

doi:10.14489/td.2018.11.pp.040-051

Cited by 2 publications

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“…In [20], to assess the structural parameters of carbon CMs from ultrasonic echograms, a method for processing of a neural network was proposed, which is less computationally intensive than the methods for processing an ultrasonic signal.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Algorithm for Estimating the Acoustic Conductivity of the Wavefront for Verification of a Diagnostic Model in an Analysis of Defects in a Polymer Composite Material

2022

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The modal analysis is considered as one of the lines of technical diagnostics for evaluating the quality of polymer composite materials (PCMs). It allows one to link the structure of modal characteristics of PCM element base in the amplitude-frequency domain. In the course of modal analysis, the complex construction of PCM as a heterogeneous material is transformed into a set of easy-to-understand independent systems with one degree of freedom. This structural approach is used to analyze the structure of PCM components. A laser is used to form an external action, with the help of which PCM components can form a wave field when vibrations pass through its thickness. Vibrations and deformations of PCM structural elements under a mechanical excitation are considered as the intrinsic vibration forms (vibration modes) of PCM elements -the filler and matrices. High-frequency laser actions extracts a constant wavefront, which is used for constructing an algorithm for recognition of the structure of PCM, including the detection of possible defects, such as changes in its density and various stratifications. To assess the technical condition of structural elements of PCM, a mathematical model was developed to assess the effect of defects on passage of a wave and the excitation of modal vibrations by the element base of PCM. The mathematical algorithm for estimating the acoustic conductivity of the wavefront, together with experimental data, was used for constructing a wave diagnostics algorithm. It made it possible to create an algorithm for a technical diagnostics of PCM elements. An experiment was conducted on the laser action on a carbon fiber panel with specially created defects. The frequency values found in various zones of carbon fiber showed a qualitative and quantitative change in the structure of PCM. It is shown that, to construct an effective model for diagnosing the technical condition of PCM elements, more experimental studies are required.

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Section: Introductionmentioning

confidence: 99%

Mathematical Algorithm for Estimating the Acoustic Conductivity of the Wavefront for Verification of a Diagnostic Model in an Analysis of Defects in a Polymer Composite Material

2022

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Laser-Ultrasonic Method of Acoustic Impedance Measurement for Quantitative Porosity Estimation of Cross-Ply Carbon Fiber Reinforced Plastic Materials

Sokolovskaya¹,

Podymova²,

Karabutov³

2020

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A method of measuring the acoustic impedance of carbon fiber plastics based on the laser optoacoustic effect is proposed and experimentally realized. Measurement of the acoustic impedance of the studied composite is made by the value of the antiderivative of ultrasonic pulse reflected from the interface between the immersion liquid and the sample. A method for determining the porosity of a material by the measured value of the acoustic impedance, based on the dependence of the material density and the velocity of propagation of longitudinal acoustic waves in it on its porosity, is presented. Porous samples of crossply reinforced carbon plastics with three types of carbon fiber lay-up schemes were studied. It was found that the studied carbon fiber plastics have a non-uniform distribution of local porosity in the plane of carbon fabric stacking. It is also shown that the variation of the local porosity in the sample depends on the fiber laying scheme. It is shown that the porosity value obtained by X-ray computed tomography coincides with the results of laser-ultrasonic measurements. The advantage of the proposed method is the possibility of rapid diagnosis of porosity with one-way access to the object under study without measuring its dimensions and mass, which can be used for composite structures of complex shape.

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The Correlation Between Strength Characteristics, Porosity and Ultrasonic Testing Data for FRP Specimens Made With Autoclave and Infusion Technologies

Cited by 2 publications

References 0 publications

Mathematical Algorithm for Estimating the Acoustic Conductivity of the Wavefront for Verification of a Diagnostic Model in an Analysis of Defects in a Polymer Composite Material

Mathematical Algorithm for Estimating the Acoustic Conductivity of the Wavefront for Verification of a Diagnostic Model in an Analysis of Defects in a Polymer Composite Material

Laser-Ultrasonic Method of Acoustic Impedance Measurement for Quantitative Porosity Estimation of Cross-Ply Carbon Fiber Reinforced Plastic Materials

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