CN117030850A - Method, device, terminal and medium for detecting buckling of composite material laminated board fibers - Google Patents
Method, device, terminal and medium for detecting buckling of composite material laminated board fibers Download PDFInfo
- Publication number
- CN117030850A CN117030850A CN202310988219.6A CN202310988219A CN117030850A CN 117030850 A CN117030850 A CN 117030850A CN 202310988219 A CN202310988219 A CN 202310988219A CN 117030850 A CN117030850 A CN 117030850A
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- composite material
- wavelet
- laminated board
- material laminated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 88
- 239000000835 fiber Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 30
- 238000010586 diagram Methods 0.000 claims abstract description 20
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000013519 translation Methods 0.000 claims abstract description 11
- 230000006870 function Effects 0.000 claims description 27
- 239000010410 layer Substances 0.000 claims description 23
- 230000000737 periodic effect Effects 0.000 claims description 22
- 230000010355 oscillation Effects 0.000 claims description 18
- 239000011229 interlayer Substances 0.000 claims description 16
- 238000004590 computer program Methods 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000009659 non-destructive testing Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 238000002604 ultrasonography Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000003325 tomography Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4472—Mathematical theories or simulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Algebra (AREA)
- Acoustics & Sound (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The application relates to the technical field of ultrasonic nondestructive testing, in particular to a method and a device for detecting buckling of composite material laminated board fibers, a terminal and a medium. The detection method comprises the following steps: carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal; selecting a wavelet basis function psi (t) with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function psi (t) to obtain psi ab (t); in psi ab (t) performing convolution operation on the analysis factor and the ultrasonic A display radio frequency signal to obtain a wavelet coefficient; determining an intrinsic scale corresponding to a layering distribution rule of the composite material laminated board according to a two-dimensional time-frequency distribution diagram of the wavelet coefficient; the fiber buckling of the composite laminates was examined and analyzed according to the intrinsic dimensions. The method, the device, the terminal and the medium for detecting the buckling of the composite material laminated board fiber aim to solve the problem of the composite material laminated boardThe fiber buckling detection of the ply of (2) is difficult to identify.
Description
Technical Field
The application relates to the technical field of ultrasonic nondestructive testing, in particular to a method and a device for detecting buckling of composite material laminated board fibers, a terminal and a medium.
Background
Carbon fiber reinforced resin based composites find wide application in the aerospace field, where layup construction and fiber orientation are important design parameters for composite laminates. In the production and manufacturing stage, defects related to fiber buckling, such as ply bridging, thickness deviation, wrong laminating sequence and the like, seriously affect the mechanical properties of the composite material laminated board, so a nondestructive testing method is required to be established aiming at the defects of the fiber buckling type of the composite material laminated board, and the information of the thickness distribution, the lamination trend and the like of the internal ply of the composite material laminated board can be effectively detected, so that the method has important significance for understanding the internal ply structure of the composite material, optimizing the technological parameters and improving the detection and characterization of the laminated board.
Therefore, the inventor provides a method, a device, a terminal and a medium for detecting the buckling of the composite material laminated board fiber.
Disclosure of Invention
(1) Technical problem to be solved
Current methods for characterizing the internal layering structure of composite laminates are mainly ultrasonic B-scan and ultrasonic tomography. The prior art has certain shortcomings and limitations in certain specific fields: (a) The ultrasonic B scanning requires that ultrasonic A which is formed by full wave and covers the composite material laminated board along the thickness direction is adopted to display radio frequency signals, time domain information (mainly signal amplitude and time domain position) of interlayer waveforms is analyzed to further obtain internal characteristics of the composite material laminated board, and the method has good detection effects on defects of layering, debonding, air holes and the like due to obvious reflection of ultrasonic at a solid-gas interface, but because the acoustic impedance difference between layers in the composite material laminated board is small, reflection signals from the layers are very weak, and are usually submerged in noise signals, so that ultrasonic signals related to layering are difficult to judge only by visual observation; on the other hand, due to the attenuation effect of the composite material on the ultrasonic, the interlayer reflection signal adjacent to the detection surface is more obvious than that of the lower layer, namely, the upper layer is obvious, which leads to the fact that the characterization capability of the conventional ultrasonic detection method on the layer structure of the composite material laminated board is weakened layer by layer, so that the defect detection capability on fiber buckling is insufficient. (b) The ultrasonic tomography is to set up different imaging gates and carry out "layer by layer" formation of image to composite material through along the time domain position, and imaging gate's setting width and position have decided the quality of layering characterization structure, and imaging gate's width has decided the resolution power to the layering, and ultrasonic tomography's image probably receives adjacent layering or background noise's influence simultaneously, just can hardly obtain the layering structure information of composite material lamination board by visual.
The embodiment of the application provides a method, a device, a terminal and a medium for detecting fiber buckling of a composite material laminated board, which solve the technical problem that weak signals are difficult to identify in fiber buckling detection of a layer of the composite material laminated board.
(2) Technical proposal
The first aspect of the application provides a method for detecting buckling of fibers of a composite material laminated board, which comprises the following steps:
carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
selecting a wavelet basis function psi (t) with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function psi (t) to obtain psi ab (t)；
In psi ab (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain a wavelet coefficient;
determining an intrinsic scale corresponding to a layering distribution rule of the composite material laminated board according to the two-dimensional time-frequency distribution diagram of the wavelet coefficient;
and according to the intrinsic scale, carrying out detection analysis on the fiber buckling of the composite material laminated board.
Further, the ultrasonic A scanning detection is carried out on the composite material laminated board to obtain an ultrasonic A display radio frequency signal, which is specifically as follows:
and extracting an ultrasonic A display radio frequency signal of the composite material laminated board by adopting a high-resolution ultrasonic focusing transducer.
Further, determining a two-dimensional time-frequency distribution map of the wavelet coefficient, specifically:
and extracting signal components closest to the respective time-frequency characteristics from wavelets with different scales to obtain a two-dimensional time-frequency distribution diagram of the wavelet coefficients.
Further, the step of phi ab And (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain wavelet coefficients, wherein the wavelet coefficients are specifically as follows:
pair psi ab (t) performing a continuous wavelet transform to obtain the wavelet coefficients.
Further, the determining the intrinsic scale corresponding to the ply distribution rule of the composite material laminated board according to the two-dimensional time-frequency distribution diagram of the wavelet coefficient specifically comprises the following steps:
drawing the wavelet coefficient on a three-dimensional time-frequency space to obtain extreme value fluctuation rule characteristics of interlayer reflected wave signal components;
and determining a certain scale of the wavelet coefficient showing an obvious periodic extremum oscillation rule on a two-dimensional time-frequency plane as the intrinsic scale.
Further, the ultrasonic A shows that the radio frequency signal is the sum of the superposition of three components of a background noise random signal, an instantaneous abrupt change signal and a steady-state periodic oscillation signal on the time domain.
Further, the wavelet basis function is Symlet mother wavelet basis function ψ (t).
A second aspect of the present application provides a device for detecting buckling of fibers of a composite laminate, comprising:
the scanning detection module is used for carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
the wavelet transformation module is used for selecting a wavelet basis function psi (t) with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function psi (t) to obtain psi ab (t)；
Convolution operation module for using psi ab (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain a wavelet coefficient;
the scale calculation module is used for determining the intrinsic scale corresponding to the layering distribution rule of the composite material laminated board according to the two-dimensional time-frequency distribution graph of the wavelet coefficient;
and the detection and analysis module is used for detecting and analyzing the fiber buckling of the composite material laminated board according to the intrinsic scale.
A third aspect of the present application provides a terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing a detection method as described above when executing the computer program.
A fourth aspect of the present application provides a computer readable storage medium storing a computer program which when executed by a processor implements a detection method as described above.
(3) Advantageous effects
In summary, the application utilizes continuous wavelet transformation to have time-frequency positioning capability and multi-resolution analysis capability on periodic oscillation components in signals, and the layering in the composite material laminated board just shows the characteristic of periodic oscillation, and fiber buckling related information is obtained by detecting layering information of the composite material laminated board, and the fiber buckling related information is not influenced by background noise.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic flow chart of a method for detecting fiber buckling of a composite material laminated board provided by an embodiment of the application;
FIG. 2 is a waveform diagram of an ultrasonic A display radio frequency signal f (t) extracted from a composite laminate using a high resolution ultrasonic focusing transducer;
FIG. 3 is a schematic diagram showing ultrasound A display radio frequency signal f (t) as the sum of the superposition of three components in the time domain of steady-state periodic oscillation signal, background noise random signal and transient abrupt change signal;
FIG. 4 is a schematic waveform diagram of a Symlet wavelet basis function ψ (t) according to an embodiment of the present application;
fig. 5 is a schematic diagram of scaling and translation of a wavelet basis function ψ (t) according to an embodiment of the present application;
FIG. 6 is a two-dimensional time domain distribution diagram of wavelet coefficients W (a, b; f (t), ψ (t)) according to an embodiment of the present application;
FIG. 7 is a feature scale a provided by an embodiment of the present application e The corresponding wavelet coefficient magnitude W (a e B; f (t), ψ (t)) presents a schematic diagram of a periodic extremum oscillation law;
FIG. 8 is a schematic diagram of an interlayer reflected wave component provided by an embodiment of the present application;
FIG. 9 (a) is a schematic diagram showing an ultrasonic A display RF signal during signal processing of a composite laminate containing fiber buckling defects according to example 1 of the present application;
FIG. 9 (b) is a schematic view of interlayer reflection waves during signal processing of a composite laminate containing fiber buckling defects according to example 1 of the present application;
FIG. 9 (c) is a two-dimensional time domain distribution of ultrasonic A display RF signals during signal processing of a composite laminate containing fiber buckling defects according to example 1 of the present application;
FIG. 9 (d) is a graph showing the interlayer reflection wave component during signal processing of a composite laminate having fiber buckling defects according to example 1 of the present application;
fig. 10 is a schematic structural diagram of a device for detecting fiber buckling of a composite laminate according to an embodiment of the present application.
In the figure:
100-scanning detection module; a 200-wavelet transform module; a 300-convolution operation module; 400-a scale calculation module; 500-detection analysis module.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
Fig. 1 is a schematic flow chart of a method for detecting fiber buckling of a composite material laminated board according to an embodiment of the present application, as shown in fig. 1, the method may include the following steps:
s100, carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
s200, selecting a wavelet basis function psi (t) with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function psi (t) to obtain psi ab (t)；
S300, psi ab (t) performing convolution operation on the analysis factor and the ultrasonic A display radio frequency signal to obtain a wavelet coefficient;
s400, determining an intrinsic scale corresponding to a layering distribution rule of the composite material laminated board according to a two-dimensional time-frequency distribution diagram of wavelet coefficients;
s500, detecting and analyzing the fiber buckling of the composite material laminated board according to the intrinsic scale.
In the embodiment, continuous wavelet transformation is adopted to carry out dimension-lifting expansion on the one-dimensional high-resolution ultrasonic A display radio frequency signal on a two-dimensional time-frequency plane, so that more and richer detection information can be provided; the time-frequency positioning capability and the multi-resolution analysis capability of the periodic oscillation component in the signal are utilized by the continuous wavelet transformation, so that the layering information of the composite material laminated board can be effectively detected, the influence of other frequency components is avoided, the detection result is clear and reliable, and the layering structure information identification degree is high.
The detection method is particularly suitable for analyzing the composite material layering structure with the periodic oscillation characteristic, and can eliminate the influence of other non-periodic components in the signal; different types of wavelet basis functions (preferably Symlet wavelet basis functions) with tight support characteristics can be selected according to the characteristics of the thickness of the composite material layer, so that the time-frequency positioning accuracy of signals is improved.
In an optional embodiment, in step S100, ultrasonic a scanning detection is performed on the composite laminate to obtain an ultrasonic a display radio frequency signal, which specifically includes: ultrasonic A display radio frequency signals of the composite material laminated board are extracted by adopting a high-resolution ultrasonic focusing transducer.
The ultrasonic A shows that the radio frequency signal is the sum of the superposition of three components of a background noise random signal, an instantaneous abrupt change signal and a steady-state periodic oscillation signal on the time domain.
Ultrasonic a using a high resolution ultrasonic focusing transducer to extract the composite laminate shows the waveform of the radio frequency signal 1 as shown in figure 2.
As shown in fig. 3, the ultrasonic a display signal 1 shown in fig. 2 is understood as a one-dimensional time domain signal f (t) with respect to time t, which can be regarded as the sum of the superposition of three components of the background noise random signal 2, the transient abrupt signal 3, and the steady-state periodic oscillation signal 4 in the time domain. Wherein a) the background noise random signal 2 may come from external disturbances of the environment, equipment, instruments, transducers, etc.; b) The transient mutation signal 3 is related to the structure of the composite material, and can be from a gas-solid interface of defects such as internal delamination and debonding of the composite material or a liquid-solid interface formed by upper and lower coupling surfaces of the composite material, because the acoustic impedances of gas, liquid and solid differ greatly, the acoustic wave reflectivity at the gas-solid interface and the liquid-solid interface is larger, the formed ultrasonic reflection echo amplitude is larger, and the ultrasonic reflection echo is easy to identify by naked eyes; c) The steady-state periodic oscillation signal 4 comes from a solid-solid interface between each layer in the composite material, the interior of the composite material can be regarded as periodic lamination of two equivalent materials, namely a layer-in-layer material and a layer-between-layer material, wherein the material in the layer-in-layer material is a mixture of fiber and resin, the material between the layer-in-layer material is resin, and the two equivalent materials are solid, and the acoustic impedances are quite similar, so that the acoustic reflectivity of the solid-solid interface is smaller, the formed ultrasonic reflection echo has smaller amplitude and is not easy to identify by naked eyes, and is interfered by a background noise random signal 2 and an instantaneous mutation signal 3, and the layer information of the composite material laminated board is hidden in the steady-state periodic oscillation signal 4 and needs to be analyzed.
As an alternative embodiment, in step S200, a wavelet basis function with tight support characteristics is selected according to the ultrasound a display radio frequency signal, and the wavelet basis function is scaled and translated to obtain ψ ab (t), specifically: after the wavelet basis function is selected, it is scaled and translated.
Wherein a suitable wavelet basis function ψ (t) is selected according to the characteristics of the ultrasound a display radio frequency signal f (t), which wavelet basis function ψ (t) has a tight support characteristic, i.e. when t→infinity, ψ (t) converges rapidly from a finite value to 0. The application selects Symlet wavelet 5 of sym16 type (the vanishing moment is 16) to carry out wavelet transformation on the ultrasonic A display radio frequency signal f (t).
As an alternative embodiment, in step S300, the value ψ is set ab And (t) performing convolution operation on the analysis factor and the ultrasonic A display radio frequency signal to obtain wavelet coefficients, wherein the wavelet coefficients are specifically as follows: pair psi ab (t) performing continuous wavelet transformation to obtain wavelet coefficients.
As shown in fig. 5, the wavelets with different scales perform convolution operation along the time domain direction, and the wavelets extract the signal components with the closest time-frequency characteristics, namely:
wherein a is a scale factor, b is a translation factor, t is time, and R is a real number.
Then, the ultrasonic A display radio frequency signal f (t) is subjected to continuous wavelet transformation, namely:
in the psi- * Representing complex conjugation of psi; w (a, b; f (t), ψ (t)) shows wavelet coefficients corresponding to the radio frequency signal f (t) for ultrasound A, the wavelet coefficients being a two-dimensional matrix for (a, b) representing ultrasound AThe distribution of the energy of the radio frequency signal f (t) in a two-dimensional time-frequency plane is shown.
As an optional implementation manner, in step S400, according to the two-dimensional time-frequency distribution diagram of the wavelet coefficient, the intrinsic scale corresponding to the ply distribution rule of the composite material laminated board is determined, which specifically includes the following steps:
s401, drawing wavelet coefficients on a three-dimensional time-frequency space, and acquiring extreme value fluctuation rule characteristics of interlayer reflected wave signal components;
s402, determining that a certain scale of the wavelet coefficient which presents an obvious periodic extremum oscillation rule on a two-dimensional time-frequency plane is an intrinsic scale.
In the above embodiment, as shown in fig. 6, the wavelet coefficients W (a, b; f (t), ψ (t)) are plotted on the three-dimensional time-frequency space, the coordinate 8 is the translation parameter b, the coordinate 9 is the scale parameter a, and the coordinate 10 represents the magnitude of W (a, b; f (t), ψ (t)) at the coordinate (b, a), that is, the extremum fluctuation law feature 11 of the interlayer reflected wave signal component that can be obtained.
As shown in fig. 7, the wavelet coefficients W (a, b; f (t), ψ (t)) are plotted on a two-dimensional time-frequency plane, the abscissa is the translation parameter b, the ordinate is the scale parameter a, and the magnitudes of W (a, b; f (t), ψ (t)) at the coordinates (b, a) are represented by color intensities, so that the extremum fluctuation rule feature 11 of the interlayer reflected wave signal component can be obtained.
As shown in FIG. 8, W (a, b; f (t), ψ (t)) is a certain dimension a in a two-dimensional time-frequency plane e The characteristic scale a is expressed by the obvious periodic extremum oscillation law e The corresponding wavelet coefficient magnitude W (a e B; f (t), ψ (t)) is extracted independently, an untreated interlayer reflection wave 12 is subjected to wavelet transformation, and an extracted interlayer reflection wave component curve 13 is extracted, the abscissa is a translation parameter b (namely time t), the ordinate is a wavelet coefficient amplitude, and the characteristic of periodic oscillation is shown, and the periodic distribution rule of the layers in the corresponding composite material, namely 'layers in layers' - 'layers' periodic alternation is shown.
Fig. 10 is a schematic structural diagram of a device for detecting fiber buckling of a composite laminate according to an embodiment of the present application, and as shown in fig. 10, the device may include:
the scanning detection module 100 is used for carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
the wavelet transformation module 200 is used for selecting a wavelet basis function with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function to obtain a psi ab (t)；
A convolution operation module 300 for generating a psi ab (t) performing convolution operation on the analysis factor and the ultrasonic A display radio frequency signal to obtain a wavelet coefficient;
the scale calculation module 400 is used for determining an intrinsic scale corresponding to a layering distribution rule of the composite material laminated board according to a two-dimensional time-frequency distribution diagram of the wavelet coefficient;
the detection and analysis module 500 is used for detecting and analyzing the fiber buckling of the composite material laminated board according to the intrinsic scale.
The scale calculation module 400 is specifically configured to:
drawing wavelet coefficients on a three-dimensional time-frequency space to obtain extreme value fluctuation rule characteristics of interlayer reflected wave signal components;
and determining that a certain scale of the wavelet coefficient which shows an obvious periodic extremum oscillation rule on a two-dimensional time-frequency plane is an intrinsic scale.
The embodiment of the application provides a terminal, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the detection method when executing the computer program.
The embodiment of the application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the detection method when being executed by a processor.
Example 1
The method for detecting the buckling of the fibers of the composite material laminated board is adopted to detect the composite material laminated board prepared by a carbon fiber reinforced resin matrix composite material BA3602 material system, and the inside of the laminated board containsHas fiber buckling defects. Selecting a high-resolution focusing transducer with the frequency of 5MHz, obtaining an ultrasonic A display radio frequency signal f (t) 14 as shown in fig. 9 (a) -9 (b), intercepting an interlayer reflection wave 15 in the time domain, performing two-dimensional time-frequency analysis on the ultrasonic A display radio frequency signal f (t) 14 to obtain a two-dimensional time domain distribution diagram, and extracting a characteristic scale a by adopting a Symlet wavelet basis function psi (t) of sym16 selected by the application as shown in fig. 9 (c) e The corresponding wavelet coefficient magnitude W (a e B; f (t), ψ (t)), as shown in fig. 9 (d), the interlayer reflected wave component curve 17 extracted after wavelet transformation exhibits a phenomenon of extreme value fluctuation, but at t=1.3×10 -6 At the s position, the interlayer reflection wave represented by extreme value fluctuation disappears, and the fiber buckling defect at the 10 th layer can be obtained according to the calculation of the longitudinal wave sound velocity of the composite material of 3000m/s and the single-layer thickness of the laminated board of 0.187 mm. The detection result of the application is visual and reliable, and can give out detailed fiber buckling information of the composite material laminated board.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The application is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.
The above is only an example of the present application and is not limited to the present application. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this application. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The method for detecting the buckling of the composite material laminated board fiber is characterized by comprising the following steps of:
carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
displaying a radio frequency signal according to the ultrasonic AThe number selection has a wavelet base function psi (t) with a tight support characteristic, and the wavelet base function psi (t) is expanded and translated to obtain the wavelet base function psi ab (t)；
In psi ab (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain a wavelet coefficient;
determining an intrinsic scale corresponding to a layering distribution rule of the composite material laminated board according to the two-dimensional time-frequency distribution diagram of the wavelet coefficient;
and according to the intrinsic scale, carrying out detection analysis on the fiber buckling of the composite material laminated board.
2. The method for detecting the buckling of the composite material laminated board fiber according to claim 1, wherein the ultrasonic a scanning detection is carried out on the composite material laminated board to obtain an ultrasonic a display radio frequency signal, specifically:
and extracting an ultrasonic A display radio frequency signal of the composite material laminated board by adopting a high-resolution ultrasonic focusing transducer.
3. The method for detecting buckling of fibers of a composite laminate according to claim 1, wherein determining the two-dimensional time-frequency distribution map of wavelet coefficients is specifically:
and extracting signal components closest to the respective time-frequency characteristics from wavelets with different scales to obtain a two-dimensional time-frequency distribution diagram of the wavelet coefficients.
4. The method for detecting buckling of fibers of a composite laminate according to claim 1, wherein the matrix is ∈ ab And (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain wavelet coefficients, wherein the wavelet coefficients are specifically as follows:
pair psi ab (t) performing a continuous wavelet transform to obtain the wavelet coefficients.
5. The method for detecting fiber buckling of a composite laminate according to claim 1, wherein the determining the intrinsic dimensions corresponding to the distribution rule of the composite laminate layer according to the two-dimensional time-frequency distribution map of the wavelet coefficients specifically comprises the following steps:
drawing the wavelet coefficient on a three-dimensional time-frequency space to obtain extreme value fluctuation rule characteristics of interlayer reflected wave signal components;
and determining a certain scale of the wavelet coefficient showing an obvious periodic extremum oscillation rule on a two-dimensional time-frequency plane as the intrinsic scale.
6. The method for detecting buckling of composite laminate fibers according to claim 1, wherein the ultrasonic a display radio frequency signal is a sum of a superposition of three components of a background noise random signal, an instantaneous abrupt signal and a steady-state periodic oscillation signal in a time domain.
7. The method of claim 1, wherein the wavelet basis function is Symlet wavelet basis function ψ (t).
8. A device for detecting buckling of fibers of a composite laminate, comprising:
the scanning detection module is used for carrying out ultrasonic A scanning detection on the composite material laminated board to obtain an ultrasonic A display radio frequency signal;
the wavelet transformation module is used for selecting a wavelet basis function with a tight support characteristic according to the ultrasonic A display radio frequency signal, and performing expansion and translation on the wavelet basis function to obtain a psi ab (t)；
Convolution operation module for using psi ab (t) performing convolution operation on the ultrasonic A display radio frequency signal serving as an analysis factor to obtain a wavelet coefficient;
the scale calculation module is used for determining the intrinsic scale corresponding to the layering distribution rule of the composite material laminated board according to the two-dimensional time-frequency distribution graph of the wavelet coefficient;
and the detection and analysis module is used for detecting and analyzing the fiber buckling of the composite material laminated board according to the intrinsic scale.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the detection method according to any of claims 1-7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the detection method according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988219.6A CN117030850A (en) | 2023-08-07 | 2023-08-07 | Method, device, terminal and medium for detecting buckling of composite material laminated board fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988219.6A CN117030850A (en) | 2023-08-07 | 2023-08-07 | Method, device, terminal and medium for detecting buckling of composite material laminated board fibers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117030850A true CN117030850A (en) | 2023-11-10 |
Family
ID=88631086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310988219.6A Pending CN117030850A (en) | 2023-08-07 | 2023-08-07 | Method, device, terminal and medium for detecting buckling of composite material laminated board fibers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117030850A (en) |
-
2023
- 2023-08-07 CN CN202310988219.6A patent/CN117030850A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5607868B2 (en) | Inspection system and operation method | |
| EP1952137B1 (en) | System and method for ultrasonically detecting discontinuous fibers in composite laminates | |
| Smith et al. | Ultrasonic analytic-signal responses from polymer-matrix composite laminates | |
| US20070186655A1 (en) | Methods and apparatus for porosity measurement | |
| CN108181378B (en) | Ultrasonic defect identification method for detecting laminated structure of mixed-layer composite material | |
| James et al. | A simulative and experimental approach toward Eddy current nondestructive evaluation of manufacturing flaws and operational damage in CFRP composites | |
| ITTO20101090A1 (en) | ULTRASONIC NON-DESTRUCTIVE INSPECTION METHOD, IN PARTICULAR FOR COMPOSITE MATERIAL STRUCTURES FOR AERONAUTICAL APPLICATIONS | |
| Jodhani et al. | Ultrasonic non-destructive evaluation of composites: A review | |
| Mei et al. | Visual geometry group-UNet: deep learning ultrasonic image reconstruction for curved parts | |
| Cao et al. | An ultrasonic signal processing method to improve defect depth estimation in composites based on empirical mode decomposition | |
| Tang et al. | Non-contact phase coded excitation of ultrasonic Lamb wave for blind hole inspection | |
| Barzegar et al. | Polar coordinate for damage imaging of adhesively bonded plates using ultrasonic guided waves and laser Doppler vibrometer measurements | |
| CN117030850A (en) | Method, device, terminal and medium for detecting buckling of composite material laminated board fibers | |
| Smith et al. | Phononic band gaps and phase singularities in the ultrasonic response from toughened composites | |
| CN110715978B (en) | Carbon fiber reinforced composite material layering sequence identification method and system | |
| CN115389625A (en) | Double-sided ultrasonic imaging method for detecting out-of-plane fiber bending of composite material | |
| Hale et al. | Ultrasonic NDE Techniques and the Effects of Flaws on Mechanical Performance in Multi-Directionally Reinforced Textile Composites | |
| CN114169373A (en) | Method for extracting GFRP internal defect characteristics based on variational modal decomposition | |
| Wang et al. | Measurement interface stiffness of bonded structures using air-coupled ultrasonic transmission technology | |
| Teles et al. | Closed disbond detection in marine glass-epoxy/balsa composites | |
| Yang et al. | Ultrasonic reconstruction of the fiber architecture of composite laminates | |
| Oh et al. | Comparison of data-processing methods by air-coupled impact echo testing for the assessment of a concrete slab | |
| Hou et al. | Ultrasonic Thickness Measurements of Thin-Walled Composite Steel Pipe | |
| Hagglund et al. | Ultrasonic imaging of thin layers within multi-layered structures | |
| Asmatulu et al. | Evaluation of fiber reinforced aircraft composites via nondestructive testing techniques |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |