CN110988119A - Method for detecting layered damage of composite laminated plate by measuring equivalent pseudo load through laser - Google Patents
Method for detecting layered damage of composite laminated plate by measuring equivalent pseudo load through laser Download PDFInfo
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- CN110988119A CN110988119A CN201911050692.XA CN201911050692A CN110988119A CN 110988119 A CN110988119 A CN 110988119A CN 201911050692 A CN201911050692 A CN 201911050692A CN 110988119 A CN110988119 A CN 110988119A
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- 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
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G01N29/22—Details, e.g. general constructional or apparatus details
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Abstract
The invention discloses a method for detecting layered damage of a composite laminated plate by measuring equivalent pseudo load by laser, which comprises the following steps of firstly, obtaining a modal vibration mode of the composite laminated plate by using laser vibration; then calculating equivalent pseudo load caused by layering by vibration mode; and finally, identifying and positioning layering according to equivalent pseudo load singular peaks, and realizing layered damage detection. The invention integrates the non-contact laser measurement technology and the new concept of equivalent pseudo load dynamics, and compared with the traditional contact sensor and modal vibration mode, the equivalent pseudo load measured by laser vibration scanning can more accurately identify and position the layered damage of the composite material laminated plate.
Description
Technical Field
The invention discloses a method for detecting layered damage of a composite laminated plate, and particularly relates to the field of nondestructive detection of composite structures.
Background
Composite material laminated plates reinforced by glass fibers and carbon fibers are increasingly applied to engineering structural components such as fan blades and the like due to the advantages of high strength, low density and the like. However, the composite laminate is susceptible to interlayer delamination damage under impact. Such damage is located inside the structure and is not easily recognized from the outside, and the local rigidity of the structure can be gradually weakened by the layering development, and even the whole operation safety of the structure is threatened.
Therefore, detecting delamination is of great importance for safe operation of composite laminated structures. When the vibration method is used for detecting the delamination damage, for small-size delamination, the structural modal shape is insensitive to the small-size delamination because the small-size delamination has weak influence on the local rigidity; meanwhile, due to the small size of the sensor, the traditional contact sensor cannot meet the requirement of layered accurate positioning due to the limitation of spatial arrangement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to extract the layering characteristics from the vibration signals measured by laser scanning vibration of each point on the surface of the composite material laminated plate, identify the layering damage and position the layering damage needs to establish a method for detecting the layering damage of the composite material laminated plate by equivalent pseudo load measured by laser.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a method for detecting layered damage of a composite laminated plate by measuring equivalent pseudo load by laser, which comprises the following steps:
(1) acquiring a high-resolution modal shape W [ x, y ] of the composite material laminated plate by using laser scanning vibration, wherein x and y are space coordinates of the shape;
(2) calculating equivalent pseudo load F [ x, y ] caused by layering according to the vibration mode W [ x, y ];
(3) and identifying and positioning layering according to the equivalent pseudo load F [ x, y ] singular peak to realize layered damage detection.
Further, a method for detecting the layered damage of the composite laminated plate by measuring the equivalent pseudo load by laser, the method for obtaining the vibration mode W [ x, y ] comprises the following steps: simple harmonic excitation is applied to the composite laminated board by a piezoelectric ceramic (PZT) sensor, meanwhile, non-contact intensive scanning measurement is carried out on each point on the surface of the composite laminated board by a scanning laser vibration meter (SLV), the steady-state vibration response of each point is obtained, and the high-resolution modal vibration mode of the composite laminated board is obtained through experimental modal analysis.
Further, the method for detecting the layered damage of the composite material laminated plate by measuring the equivalent pseudo load by the laser comprises the following specific calculation in the step (2):
d, rho and h are respectively bending rigidity, average density and thickness of the composite material laminated plate, and f is natural frequency corresponding to the vibration mode.
Further, the method for detecting the layered damage of the composite laminated plate by measuring the equivalent pseudo load by the laser comprises the following steps (3) according to the singular peak of the pseudo load, and the method comprises the following steps: if the composite material laminated plate is layered, the pseudo load of the composite material laminated plate forms a local singular peak at the layered position, and the singular peak is identified, positioned and layered according to the local singular peak, so that layered damage detection is realized.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
the invention discloses a method for detecting layered damage of a composite material laminated plate by measuring equivalent pseudo load by laser, which integrates a non-contact laser measurement technology and a new concept of equivalent pseudo load dynamics, and compared with the traditional contact sensor and modal vibration mode, the equivalent pseudo load measured by laser vibration sweeping can more accurately identify and position the layered damage of the composite material laminated plate.
Drawings
FIG. 1 is a schematic diagram of the operation of the process of the present invention.
Fig. 2 is a modal shape of a layered CFRP-containing laminate of the present invention.
Fig. 3 is a graph of delamination testing results using the CFRP laminate of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides a method for detecting layered damage of a composite laminated plate by measuring equivalent pseudo load by laser. Firstly, obtaining a high-resolution vibration mode of the composite material laminated plate through laser scanning vibration measurement; further, the equivalent pseudo load caused by delamination is extracted from the mode shape, and the equivalent pseudo load has higher damage sensitivity. And identifying and positioning the layering through singular peaks of equivalent pseudo loads at the layering positions, so as to realize layered damage detection.
As shown in fig. 1, the present invention provides a method for detecting a layered damage of a composite material laminate by measuring an equivalent pseudo load with a laser, which specifically comprises the following steps:
(1) acquiring a high-resolution modal shape W [ x, y ] of the composite material laminated plate by using laser scanning vibration, wherein x and y are space coordinates of the shape;
(2) calculating equivalent pseudo load F [ x, y ] caused by layering according to the vibration mode W [ x, y ];
(3) and identifying and positioning layering according to the equivalent pseudo load F [ x, y ] singular peak to realize layered damage detection.
The four-ply Carbon Fibre Reinforced (CFRP) laminate used in the examples had a length of 500mm, a width of 500mm and a thickness of 3mm, and between the second and third plies there was a layer of 15mm x 15mm in size, with the co-ordinate x being 125 and y being 375 in the centre of the layer and the dimensionless co-ordinate being
At the lower left corner of the front surface of the CFRP laminated plate, a piezoelectric ceramic sensor is used for applying simple harmonic excitation under natural frequency, meanwhile, a scanning laser vibration meter is used for measuring steady-state vibration response of 375 multiplied by 375 measuring points on the back surface of the CFRP laminated plate, and the high-resolution modal vibration mode of the CFRP laminated plate is obtained through experimental modal analysis.
And (3) obtaining the mode shape W [ x, y ] of the damaged CFRP laminated plate at 3504.68Hz according to the step (1), as shown in figure 2. As can be seen from fig. 2, a slight delamination cannot cause local singularity of the mode shape at the position of the delamination, and thus cannot be directly used for delamination detection.
And (3) calculating to obtain equivalent pseudo loads F [ x, y ] caused by layering according to the mode vibration W [ x, y ] of the CFRP laminated plate with the damage in the step (2), wherein singular peaks are formed locally to indicate that the CFRP laminated plate is layered, and the positions of the singular peaks are layered positions, which are shown in a reference figure 3. Therefore, the layering of the CFRP laminated plate is effectively identified and positioned, and the CFRP laminated plate is accurately detected.
In this embodiment: the scanning laser vibrometer model is PSV-400 of Polytec, Germany.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A method for detecting the layered damage of a composite laminated plate by measuring equivalent pseudo load by laser is characterized by comprising the following steps:
(1) acquiring a high-resolution modal shape W [ x, y ] of the composite material laminated plate by using laser scanning vibration, wherein x and y are space coordinates of the shape;
(2) calculating equivalent pseudo load F [ x, y ] caused by layering according to the vibration mode W [ x, y ];
(3) and identifying and positioning layering according to the equivalent pseudo load F [ x, y ] singular peak to realize layered damage detection.
2. The method for detecting the delamination damage of the composite material laminate by laser measurement of the equivalent pseudo load according to claim 1, wherein the specific calculation in the step (2) is as follows:
3. The method for detecting the layered damage of the composite laminated plate by the laser measurement equivalent pseudo load according to claim 1, wherein the method for detecting the layering according to the singular peak of the pseudo load in the step (3) comprises the following steps: if the composite material laminated plate is layered, the pseudo load of the composite material laminated plate forms a local singular peak at the layered position, and the singular peak is identified, positioned and layered according to the local singular peak, so that layered damage detection is realized.
4. The method for detecting the layered damage of the composite material laminate by the laser measurement equivalent pseudo load as claimed in claim 1, wherein the obtaining method of the mode shape W [ x, y ] comprises: simple harmonic excitation is applied to the composite material laminated plate by using the piezoelectric ceramic sensor, meanwhile, non-contact intensive scanning measurement is carried out on each point on the surface of the composite material laminated plate by using a scanning type laser vibration meter, the steady-state vibration response of each point is obtained, and the high-resolution modal vibration mode of the composite material laminated plate is obtained through experimental modal analysis.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707731A (en) * | 2020-06-28 | 2020-09-25 | 河海大学 | Pile body crack detection method for measuring axial equivalent pseudo load by three-dimensional laser scanning |
| CN112649349A (en) * | 2020-12-18 | 2021-04-13 | 中国兵器工业第五九研究所 | Method for quickly evaluating aramid fiber reinforced polyolefin structure function integrated material |
| CN115876883A (en) * | 2022-12-29 | 2023-03-31 | 南京航空航天大学 | Detection method and detection system for layered damage position of composite laminated plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707731A (en) * | 2020-06-28 | 2020-09-25 | 河海大学 | Pile body crack detection method for measuring axial equivalent pseudo load by three-dimensional laser scanning |
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| CN115876883A (en) * | 2022-12-29 | 2023-03-31 | 南京航空航天大学 | Detection method and detection system for layered damage position of composite laminated plate |
| CN115876883B (en) * | 2022-12-29 | 2024-03-29 | 南京航空航天大学 | Method and system for detecting layered damage position of composite material laminated plate |
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