CN112763578B - In-service integral composite material R area detection method, reference test block and test block manufacturing method - Google Patents
In-service integral composite material R area detection method, reference test block and test block manufacturing method Download PDFInfo
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- CN112763578B CN112763578B CN202110375154.9A CN202110375154A CN112763578B CN 112763578 B CN112763578 B CN 112763578B CN 202110375154 A CN202110375154 A CN 202110375154A CN 112763578 B CN112763578 B CN 112763578B
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- 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
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
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- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0231—Composite or layered materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
The invention provides an in-service integral composite material R area detection method, a comparison test block and a test block manufacturing method, wherein a composite material product to be detected is analyzed, then the comparison test block is constructed, the focusing analysis of key parameters is carried out on the comparison test block according to the analysis characteristics, so that the optimal key parameters are obtained, and then the nondestructive detection is carried out on the composite material product which actually needs to be detected by the optimal key parameters; according to the invention, accurate, simple, convenient and rapid nondestructive measurement is realized on the R area part of the composite material which is in service, integrated and difficult to measure. The problem that the defect of the integral composite material R distinguishing layer cannot be detected in situ in the in-service stage is solved.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing of composite material components, and particularly relates to an in-service integral composite material R region testing method, a reference test block and a test block manufacturing method.
Background
The composite material has the advantage of easy forming, and can be manufactured into relatively complex integrated composite parts, such as an integrated reinforced wall plate, an integrated grid structure, an integrated box section part and the like, by adopting the process methods of co-curing, adhesive co-curing, resin transfer molding ((RTM), fabric pre-forming and the like, however, in service, the composite parts are limited by various environmental factors, the R region of the integrated composite parts is easy to concentrate stress under the action of external load, the failure mechanism is complex, including fiber fracture, matrix fracture, R region delamination and the like, and particularly the rigidity, the strength and the structural integrity of the composite parts are seriously reduced due to delamination failure, so that corresponding nondestructive detection technical means are required to be established to provide quality guarantee for the installation application of the integrated composite material structure, and compared with the laminated plate region with an open integrated composite material structure, the geometric structure, the layering mode and the defect distribution of the R region are complex, great challenge is brought to nondestructive testing, so that the nondestructive testing of the R region is the key to solve the problem of the integrated nondestructive testing of the composite material.
At present, the ultrasonic phased array detection method is an advanced, convenient and effective detection means, and the dynamic focusing and deflection characteristics of the sound beams of the ultrasonic phased array technology provide unique technical advantages for detecting the R area structure of the composite material structure. The ultrasonic phased array detection technology for the R area of the integrated composite structure generally performs detection in a mode that ultrasonic waves are incident perpendicular to the surface of the R area, is only suitable for detection of the open R area in the manufacturing stage, and is not suitable for in-situ detection of the R area of the integrated composite structural member in the in-service stage.
Disclosure of Invention
Aiming at the defects and requirements in the prior art, the invention provides an in-service integral composite material R region detection method, a comparison test block and a test block manufacturing method, wherein the composite material product to be detected is analyzed, then the comparison test block is constructed, the focusing analysis of key parameters is carried out on the comparison test block according to the analysis characteristics, so that the optimal key parameters are obtained, and then the composite material product which actually needs to be detected is subjected to nondestructive detection by the optimal key parameters; according to the invention, accurate, simple, convenient and rapid nondestructive measurement is realized on the R area part of the composite material which is in service, integrated and difficult to measure. The problem that the defect of the integral composite material R distinguishing layer cannot be detected in situ in the in-service stage is solved.
The specific implementation content of the invention is as follows:
the invention provides an in-service integral composite material R-area ultrasonic phased array sector scanning imaging detection method, which is used for carrying out material detection and product quality evaluation on an R area of an in-service integral composite material product according to an ultrasonic phased array sector scanning imaging technology, and comprises the following steps:
step 1: firstly, establishing an ultrasonic phased array detection simulation model of an R area of a composite material product to be detected, scanning a propagation behavior of an ultrasonic phased array sector of the ultrasonic phased array detection simulation model, and carrying out finite element simulation analysis by transmitting sound waves obliquely incident into the composite material of the ultrasonic phased array detection simulation model at an incident angle; researching the sound transmission characteristic of the composite material according to the analysis result of the finite element simulation analysis;
step 2: designing and manufacturing a comparison test block containing artificial defects based on the structural characteristics and defect mechanism of the R area of the composite material;
and step 3: performing experimental verification on key process parameters of artificial defects in the reference block by adopting an ultrasonic phased array sector scanning imaging focusing rule, comparing and analyzing ultrasonic phased array sector scanning images, and determining optimal key process parameters;
and 4, step 4: and detecting the R area of the composite material product to be detected by using the determined optimal key process parameters, and then evaluating the quality of the R area of the composite material product to be detected according to the detection result.
In order to better implement the present invention, further, in step 3, the key process parameters include depth of focus, aperture, and deflection angle; and performing multiple imaging scans on the comparison test block by adopting ultrasonic phased array sector scanning imaging and selecting different key process parameters, comparing images of each imaging scan, and selecting the optimal key process parameter by using a focusing rule.
In order to better implement the invention, it is further advantageous,
the selected values of the depth of focus are: 1mm, 5mm, 8mm, 20mm, 40mm and 200 mm;
the aperture has selected values of 4 wafers, 8 wafers, 12 wafers and 16 wafers;
the selection range of the deflection angle is 1 degree to 20 degrees, 1 degree to 40 degrees, 70 degrees to 90 degrees, 50 degrees to 80 degrees and 20 degrees to 60 degrees.
In order to better implement the invention, further, in step 2, the reference block comprises a plurality of layers of composite prepreg, and the artificial defect is a double-layer polytetrafluoroethylene circular membrane which is arranged between the layers of the reference block at intervals in a staggered manner.
In order to better implement the method, in step 1, the ultrasonic phased array detection simulation model is obliquely incident into the composite material by adopting an incident angle of 33 degrees to carry out sound wave propagation, and then finite element simulation analysis is carried out.
In order to better implement the present invention, further, finite element simulation analysis was performed using COMSOL Multiphysics software.
The invention also provides a comparison test block for the in-service integral composite material R-area ultrasonic phased array sector scanning imaging detection method, wherein the comparison test block comprises a Z rib part, a C rib part and a panel part, wherein the Z rib part, the C rib part and the panel part are formed by multiple layers of composite material prepregs; the panel part is laid on the lower side, the C rib part and the Z rib part are arranged on the panel part and are overlapped, and the three parts form a comparison test block with a J-shaped rib structure;
artificial defects are placed in the inner layer of the composite material prepreg in the R area of the Z rib part or/and the C rib part at staggered intervals;
the artificial defect is a double-layer polytetrafluoroethylene circular membrane;
the size of the reference block is 190mm × 170mm × 124 mm.
The invention also provides a manufacturing method of the reference block, which is used for manufacturing the reference block and comprises the following steps:
step S1: producing and designing artificial defects, and manufacturing a double-layer polytetrafluoroethylene membrane with the radius of phi 6mm as the artificial defects;
step S2: and (3) laying test blocks, specifically operating as follows: 50 sheets of composite material prepreg with the single-layer thickness of 0.125mm and the size of 200mm multiplied by 200mm are used for laying and forming a panel part; laying 14 sheets of composite material prepreg with the single-layer thickness of 0.125mm and the size of 280mm multiplied by 200mm to form Z rib parts; c rib parts are formed by laying 14 pieces of composite prepreg with the single-layer thickness of 0.125mm and the size of 280mm multiplied by 200 mm;
step S3: c rib parts, Z rib parts and panel parts are spliced and are solidified and molded by adopting an autoclave method;
step S4: and (3) performing edge processing on the cured and molded product, and removing the peripheral allowance to obtain a reference block with the final size of 190mm multiplied by 170mm multiplied by 124 mm.
In order to better implement the present invention, in step S2, the operations of stacking the panel portion, the Z bead portion, and the C bead portion are further: and (3) carrying out cross laying on the single-layer composite prepreg according to four directions of 0 degree, 45 degrees and 90-45 degrees, and placing an artificial defect at the corresponding position of an R region needing to be provided with the artificial defect in the laying process.
In order to better implement the present invention, in step S3, when the autoclave method is used for curing, the panel portion is first cured and molded, and then the panel portion, the C rib portion and the Z rib portion are cured and molded by co-bonding the ribs of the C rib portion and the Z rib portion with the fascia.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention breaks through the technical bottleneck that the in-service integrated composite material structure R area is not detectable in situ, and has great engineering application value;
(2) the invention provides a composite material ultrasonic phased array detection simulation model; the size and the position of the artificial defect in the designed reference block completely meet the requirements of design drawings, and the reference block can be repeatedly manufactured;
(3) the invention provides the key process parameter research of the optimized focusing rule, and can be finely adjusted and used on different detection objects;
(4) the ultrasonic phased array detection image provided by the invention can be stored, the result has traceability, even if the integrated composite material structure with a damaged service is adopted, the detection results before and after the comparison can be carried out, accurate quality data can be provided for designers, so that the damage tolerance of the designers can be conveniently evaluated, and the operation and maintenance cost of the airplane can be reduced.
Drawings
FIG. 1 is a schematic physical anatomy diagram of a typical delamination defect in the R region;
FIG. 2 is a schematic diagram of the R region of the ultrasonic phased array sector scanning imaging detection in-service phase according to the present invention;
FIG. 3 is a schematic diagram of a simulation model with oblique incidence;
FIG. 4 is a diagram showing the sound field distribution at 0.13us of a resin-layer model sound wave;
FIG. 5 is a schematic view of the Z-rib structure of the present invention;
FIG. 6 is a schematic structural view of a C rib of the present invention;
FIG. 7 is a schematic view of the construction of the panel section of the present invention;
FIG. 8 is a schematic structural view of a reference block composed of Z ribs, C ribs and a panel part;
FIG. 9 is a schematic structural diagram of the present invention for setting artificial defects in a reference block;
FIG. 10 is a computer interface screenshot of test data with a depth of focus of 1 mm;
FIG. 11 is a computer interface screenshot of test data with a depth of focus of 5 mm;
FIG. 12 is a computer interface screenshot of test data with a depth of focus of 10 mm;
FIG. 13 is a computer interface screenshot of test data with a depth of focus of 20 mm;
FIG. 14 is a computer interface screenshot of test data with a depth of focus of 40 mm;
FIG. 15 is a computer interface screenshot of test data with a depth of focus of 200 mm;
FIG. 16 is a computer interface screenshot of experimental data for 4 wafer apertures;
FIG. 17 is a computer interface screen shot of experimental data for an 8 wafer aperture;
FIG. 18 is a computer interface screen shot of experimental data for a 12 wafer aperture;
FIG. 19 is a computer interface screen shot of experimental data for a 16 wafer aperture;
FIG. 20 is a computer interface screen shot of experimental data for deflection angles of 1-20 degrees;
FIG. 21 is a computer interface screen shot of experimental data for deflection angles of 1-40 degrees;
FIG. 22 is a computer interface screen shot of experimental data for a deflection angle of 70-90 degrees;
FIG. 23 is a computer interface screen shot of experimental data for deflection angles of 50-80 degrees;
FIG. 24 is a computer interface screen shot of experimental data for deflection angles of 20-60 degrees;
FIG. 25 is a computer interface screen shot of test data for a best-area phased array test result;
FIG. 26 is the excellent zone ultrasonic A-scan test result of FIG. 25;
FIG. 27 is a computer interface screen shot of test data for a # 1 defective phased array test result;
FIG. 28 is the excellent zone ultrasonic A-scan test result of FIG. 27;
FIG. 29 is a computer interface screen shot of test data for a 2# defective phased array test result;
FIG. 30 is the excellent zone ultrasonic A-scan test result of FIG. 29.
Wherein: 1. layering, 2, a phased array probe, 3, an R area, 4, a carbon fiber resin-based layering material, 5, a resin interface, 6, an incident wave, 7, a reflected wave, 8 and an artificial defect.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the embodiment provides an in-service integral composite material R-zone ultrasonic phased array sector scanning imaging detection method, which is used for performing material detection and product quality evaluation on an R zone of an in-service integral composite material product according to an ultrasonic phased array sector scanning imaging technology, and as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 9, fig. 10, fig. 11, fig. 12, fig. 13, fig. 14, fig. 15, fig. 16, fig. 17, fig. 18, fig. 19, fig. 20, fig. 21, fig. 22, fig. 23, fig. 24, fig. 25, fig. 26, fig. 27, fig. 28, fig. 29 and fig. 30, the in-service integral composite material R-zone ultrasonic phased array sector scanning imaging detection method comprises the following steps:
step 1: firstly, establishing an ultrasonic phased array detection simulation model of an R area of a composite material product to be detected, scanning a propagation behavior of an ultrasonic phased array sector of the ultrasonic phased array detection simulation model, and carrying out finite element simulation analysis by transmitting sound waves obliquely incident into the composite material of the ultrasonic phased array detection simulation model at an incident angle; researching the sound transmission characteristic of the composite material according to the analysis result of the finite element simulation analysis;
step 2: designing and manufacturing a comparison test block containing artificial defects based on the structural characteristics and defect mechanism of the R area of the composite material;
and step 3: performing experimental verification on key process parameters of artificial defects in the reference block by adopting an ultrasonic phased array sector scanning imaging focusing rule, comparing and analyzing ultrasonic phased array sector scanning images, and determining optimal key process parameters;
and 4, step 4: and detecting the R area of the composite material product to be detected by using the determined optimal key process parameters, and then evaluating the quality of the R area of the composite material product to be detected according to the detection result.
In order to better implement the present invention, further, in step 3, the key process parameters include depth of focus, aperture, and deflection angle; and performing multiple imaging scans on the comparison test block by adopting ultrasonic phased array sector scanning imaging and selecting different key process parameters, comparing images of each imaging scan, and selecting the optimal key process parameter by using a focusing rule.
In order to better implement the invention, it is further advantageous,
the selected values of the depth of focus are: 1mm, 5mm, 8mm, 20mm, 40mm and 200 mm;
the aperture has selected values of 4 wafers, 8 wafers, 12 wafers and 16 wafers;
the selection range of the deflection angle is 1-20 degrees, 1-40 degrees, 70-90 degrees and 50-80 degrees.
In order to better implement the invention, further, in step 2, the reference block comprises a plurality of layers of composite prepreg, and the artificial defect is a double-layer polytetrafluoroethylene circular membrane which is arranged between the layers of the reference block at intervals in a staggered manner.
In order to better implement the method, in step 1, the ultrasonic phased array detection simulation model is obliquely incident into the composite material by adopting an incident angle of 33 degrees to carry out sound wave propagation, and then finite element simulation analysis is carried out.
In order to better implement the present invention, further, finite element simulation analysis was performed using COMSOL Multiphysics software.
The working principle is as follows: FIG. 1 is a layered schematic representation. Fig. 1 is a pictorial representation, which is merely illustrative and does not have any material effect on the technical content described in the present application.
Resin material density 1240kg/m3，The speed of sound is about 2580 m/s. The carbon fiber density is about 1800kg/m3The speed of sound is approximately 3350 m/s. Finite element simulation analysis carries out the mesh discretization with the simulation object, and the fibre diameter of setting is 8um, and divides the mesh and need be less than the fibre size, consequently, model mesh size is minimum, leads to mesh quantity very big for simulation inefficiency. Therefore, the established simulation model is small, only two composite material layers are adopted for simulation analysis of ultrasonic characteristics, and the adopted ultrasonic frequency is 50 MHz. Finite element simulation analysis was performed using COMSOL Multiphysics software to study the acoustic propagation characteristics of the composite material by propagating acoustic waves obliquely incident into the composite material at an angle of incidence of 33 deg.. The detection mode in detection is shown in fig. 2. The sound velocity of the probe inclined block of the phased array probe 2 is 2337m/s, the sound velocity of the composite material is 2870m/s, and repeated experiments prove that the optimal refraction angle is 42 degrees, and correspondingly, the incident angle corresponding to 42 degrees is 33 degrees, so that the oblique incidence is carried out by adopting the incident angle of 33 degrees.
Simulation analysis is carried out on the sound wave transmission obliquely incident into the composite material, and the built model is as shown in figure 3, wherein the resin contains two layers of carbon fiber resin-based paving material 4. In this model, the sound wave emitted by the sound source propagates into the composite material with an incident wave 6 at an angle of incidence of 33 °, and a certain reflected wave 6 is reflected through the resin interface 5.
Fig. 4 is a sound field distribution at 0.13us of the resin-layer model sound wave. As can be seen from the figure, the ultrasonic energy has a significant attenuation after the ultrasound has been transmitted through the two layers of the carbon fiber resin-based ply material 4. Therefore, when the composite material is subjected to ultrasonic detection, although the fiber diameter is small and the thickness of the layer is 0.125mm, which is smaller than the wavelength of ultrasonic waves, the sound wave reflection is generated at the layer-resin interface by the compact structure, and the sound wave is generated at the interface in an inclined reflection manner.
The focusing algorithm step comprises: firstly, focusing depths are respectively 1mm, 5mm, 8mm, 20mm, 40mm and 200mm for testing artificial defects of a test block, the experimental results are shown in fig. 10, 11, 12, 13, 14 and 15, and the results show that the defects are found at the focusing depth of 1mm, but the defect amplitude is low and the imaging effect is poor; the defects are found in the 5mm focusing depth, the grating lobe is high, the signal-to-noise ratio is high, and the imaging definition is high; defects are found when the focusing depth is 8mm, the signal-to-noise ratio is high, and the imaging definition is high; defects are found in the focusing depths of 20mm, 40mm and 200mm, and the imaging definition is basically consistent and not obviously improved. Therefore, the depth of focus is selected according to the thickness of the object. And secondly, the aperture is adopted to respectively carry out experiments on artificial defects of the test block by adopting apertures of 4 wafers, 8 wafers, 12 wafers and 16 wafers, the experimental results are shown in figures 16, 17, 18 and 19, and when 4 wafers, 8 wafers and 12 wafers are adopted, the sound energy is not concentrated enough, the side lobe of the synthesized sound beam is more, and the image has defect artifacts. The better the imaging effect of 16 wafers, the smaller the imaging deformation of artificial defects and the improved image definition. Thirdly, the deflection angles are respectively 1-20 degrees, 1-40 degrees, 70-90 degrees, 50-80 degrees and 20-60 degrees, the artificial defects of the test block are tested, the test results are shown in fig. 20, 21, 22, 23 and 24, and the results show that the defects cannot be found due to very high grating lobes when the deflection angles are 1-20 degrees; when the deflection angle is 1-40 degrees, the grating lobe is higher, the defect is found, the defect display is incomplete, and the defect boundary display is measured by adopting an angle cursor to be 26 degrees; no image exists at a deflection angle of 70-90 degrees, which indicates that 90 degrees is a limit angle and the fan scanning cannot deflect to the limit angle; and when the grating lobe is deflected by an angle of 50-80 degrees, the defect is found, the defect is not displayed fully, and the defect boundary is measured by using an angle cursor to display 53 degrees. Therefore, when the optimal deflection angle of the ultrasonic phased array sound beam is within the range of +/-20 degrees of the wedge angle, the sound field has good directivity.
In step 4, the real object sample is a T-shaped part, wherein an R area 3 contains a natural layering defect, as shown in fig. 2, ultrasonic phased array in-situ detection is performed from the panel side of the T-shaped part by adopting the focusing rule of step 3, 2R area ultrasonic phased array detection works are expanded from the panel side of the T-shaped part, 2 natural defects are found in total, which are a 1# defect and a 2# defect respectively, the ultrasonic phased array detection results of the excellent area and the two defects are as shown in fig. 25, fig. 27 and fig. 29, the ultrasonic a scan is used for verification from the R area 3, 2 natural defects are found, the ultrasonic a scan detection results are shown in fig. 26, fig. 28 and fig. 30, the ultrasonic phased array detection results are matched with the ultrasonic a scan detection results, and finally the defects are judged according to the acoustic phased array sector scan image.
Example 2:
the embodiment provides a reference block for the above-mentioned in-service integral composite material R-zone ultrasonic phased array sector scanning imaging detection method, as shown in fig. 5, 6, 7, 8, and 9, the reference block includes a Z rib portion, a C rib portion, and a panel portion, which are formed by multiple layers of composite material prepregs; the panel part is laid on the lower side, the C rib part and the Z rib part are arranged on the panel part and are overlapped, and the three parts form a comparison test block with a J-shaped rib structure;
the artificial defect 8 is a double-layer polytetrafluoroethylene circular membrane;
the size of the reference block is 190mm × 170mm × 124 mm.
Example 3:
this embodiment proposes a manufacturing method of a reference block for manufacturing the reference block, which includes the following steps as shown in fig. 5, 6, 7, 8, and 9:
step S1: producing and designing an artificial defect 8, and manufacturing a double-layer polytetrafluoroethylene membrane with the radius of phi 6mm as the artificial defect 8;
step S2: and (3) laying test blocks, specifically operating as follows: 50 sheets of composite material prepreg with the single-layer thickness of 0.125mm and the size of 200mm multiplied by 200mm are used for laying and forming a panel part; laying 14 sheets of composite material prepreg with the single-layer thickness of 0.125mm and the size of 280mm multiplied by 200mm to form Z rib parts; c rib parts are formed by laying 14 pieces of composite prepreg with the single-layer thickness of 0.125mm and the size of 280mm multiplied by 200 mm;
step S3: c rib parts, Z rib parts and panel parts are spliced and are solidified and molded by adopting an autoclave method;
step S4: and (3) performing edge processing on the cured and molded product, and removing the peripheral allowance to obtain a reference block with the final size of 190mm multiplied by 170mm multiplied by 124 mm.
In order to better implement the present invention, in step S2, the operations of stacking the panel portion, the Z bead portion, and the C bead portion are further: and (3) carrying out cross laying on the single-layer composite prepreg according to four directions of 0 degree, 45 degrees and 90-45 degrees, and placing the artificial defect 8 at the position corresponding to the R region 3 needing to be provided with the artificial defect 8 in the laying process.
In order to better implement the present invention, in step S3, when the autoclave method is used for curing, the panel portion is first cured and molded, and then the panel portion, the C rib portion and the Z rib portion are cured and molded by co-bonding the ribs of the C rib portion and the Z rib portion with the fascia.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (2)
1. An in-service integrated composite material R area detection method is used for carrying out material detection and product quality evaluation on an R area of an in-service integrated composite material product according to an ultrasonic phased array sector scanning imaging technology, and is characterized by comprising the following steps of:
step 1: firstly, establishing an ultrasonic phased array detection simulation model of an R area of a composite material product to be detected, scanning and propagating the ultrasonic phased array sector of the ultrasonic phased array detection simulation model, obliquely injecting the ultrasonic phased array sector into the composite material of the ultrasonic phased array detection simulation model by adopting a 33-degree incidence angle for sound wave propagation, and then carrying out finite element simulation analysis; researching the sound transmission characteristic of the composite material according to the analysis result of the finite element simulation analysis;
step 2: designing and manufacturing a comparison test block containing artificial defects based on the structural characteristics and defect mechanism of the R area of the composite material; the reference block comprises a Z rib part, a C rib part and a panel part, wherein the Z rib part, the C rib part and the panel part are formed by multiple layers of composite prepreg; the panel part is laid on the lower side, the C rib part and the Z rib part are arranged on the panel part and are overlapped, and the three parts form a comparison test block with a J-shaped rib structure;
artificial defects are placed in the inner layer of the composite material prepreg in the R area of the Z rib part or/and the C rib part at staggered intervals;
the artificial defect is a double-layer polytetrafluoroethylene circular membrane with the radius of phi 6 mm;
the panel part comprises 50 single-layer composite prepreg with the thickness of 0.125mm which is cross-laid in a single-layer manner in four directions of 0 degree, 45 degrees, 90 degrees and-45 degrees;
the Z rib parts comprise 14 single-layer composite prepreg with the thickness of 0.125mm which is cross-laid in a single-layer mode in four directions of 0 degree, 45 degrees, 90 degrees and-45 degrees;
the C rib part comprises 14 single-layer composite prepreg with the thickness of 0.125mm which is cross-laid in a single-layer mode in four directions of 0 degree, 45 degrees, 90 degrees and-45 degrees;
and step 3: performing experimental verification on key process parameters of artificial defects in the reference block by adopting an ultrasonic phased array sector scanning imaging focusing rule, comparing and analyzing ultrasonic phased array sector scanning images, and determining optimal key process parameters; the key process parameters comprise depth of focus, aperture and deflection angle; adopting ultrasonic phased array sector scanning imaging to perform multiple times of imaging scanning on different key process parameters selected by a comparison test block, comparing images of each time of imaging scanning, and selecting the optimal key process parameter by a focusing method; the selected values of the depth of focus are: 1mm, 5mm, 8mm, 20mm, 40mm and 200 mm;
the aperture has selected values of 4 wafers, 8 wafers, 12 wafers and 16 wafers;
the selection range of the deflection angle is 1-20 degrees, 1-40 degrees, 70-90 degrees, 50-80 degrees and 20-60 degrees;
and 4, step 4: and detecting the R area of the composite material product to be detected by using the determined optimal key process parameters, and then evaluating the quality of the R area of the composite material product to be detected according to the detection result.
2. The in-service integral composite material R zone detection method as claimed in claim 1, wherein COMSOL Multiphysics software is adopted for finite element simulation analysis.
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