CN109521094B - Acoustic resonance detection method for internal quality of porcelainized resin matrix composite obliquely-stacked winding product - Google Patents
Acoustic resonance detection method for internal quality of porcelainized resin matrix composite obliquely-stacked winding product Download PDFInfo
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- CN109521094B CN109521094B CN201811432187.7A CN201811432187A CN109521094B CN 109521094 B CN109521094 B CN 109521094B CN 201811432187 A CN201811432187 A CN 201811432187A CN 109521094 B CN109521094 B CN 109521094B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
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Abstract
The invention discloses an acoustic resonance detection method for internal quality of a ceramizable resin-based composite material obliquely-overlapped wound product, which comprises the following steps: establishing a typical acoustic resonance detection picture library; obtaining a product frequency sweep display image; obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph; preparing a standard sample of the layering defect; obtaining a sensitivity value according to the layering defect standard sample; judging whether the gain amplitude and the phase amplitude exceed the sensitivity value; and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified. The method has the advantages that the position, the size and the type of the internal defects of the ceramic resin matrix composite material obliquely-stacked winding product can be accurately identified, the harmful defects such as debonding and layering in a certain range can be effectively detected, the detectable rate of the internal harmful defects is greatly improved, the consistency of the detection quality and the detection result is ensured, and the method has the technical effects of high sensitivity, high detection precision and high reliability.
Description
Technical Field
The application relates to the technical field of nondestructive testing, in particular to an acoustic resonance testing method for internal quality of a porcelainized resin matrix composite obliquely-overlapped winding product.
Background
In the process of manufacturing and forming the ceramic resin composite material, particularly in the process of manufacturing and forming by adopting an oblique overlapping winding process, because various process parameters are difficult to control accurately, the defects such as layering, debonding, uneven material and the like are easily generated in the ceramic resin composite material, the strength and the rigidity of the composite material are usually rapidly lost due to the defects, the function and the bearing service life of the material are greatly reduced, and disastrous results can be caused sometimes. In particular, the delamination and debonding defects in the material affect the structural integrity by reducing the compressive strength and the thermophysical properties of the material, and the delamination and debonding in the structure are propagated under the condition of bearing mechanical or thermal load, and the material can be cracked and failed under severe conditions. In order to ensure the structural integrity and the use reliability of the ceramic resin composite material obliquely-stacked and wound product, a nondestructive detection technology is generally adopted to detect the delamination and debonding defects.
However, in the process of implementing the technical solution in the embodiment of the present application, the inventor of the present application finds that the above prior art has at least the following technical problems:
in the prior art, as the ceramic resin composite material obliquely-overlapped wound product has the structural characteristics of nonuniform interior, anisotropy and the like and is closely related to the manufacturing process of the product, the technical problem that no corresponding detection standard sample and detection method exist in China is caused.
Disclosure of Invention
The embodiment of the application provides a sound resonance detection method for internal quality of a ceramizable resin matrix composite obliquely-overlapped wound product, and aims to solve the technical problem that in the prior art, no corresponding detection standard sample and detection method exist in China due to the facts that the ceramizable resin matrix composite obliquely-overlapped wound product has structural characteristics of internal unevenness, anisotropy and the like and is closely related to a product manufacturing process. By preparing a typical artificial defect standard sample with the same process as a product, the method achieves the purposes of accurately identifying the position, size and type of the internal defect of the ceramic resin matrix composite obliquely-stacked and wound product, can effectively detect the harmful defects such as debonding, layering and the like in a certain range, greatly improves the detection rate of the internal harmful defect, ensures the consistency of detection quality and detection result, and has the technical effects of high sensitivity, high detection precision and high reliability.
In order to solve the above problem, an embodiment of the present application provides a method for detecting acoustic resonance of internal mass of a ceramifiable resin-based composite material obliquely-stacked winding product, where the method includes: establishing a typical acoustic resonance detection picture library; obtaining a product frequency sweep display image; obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph; preparing a standard sample of the layering defect; obtaining a sensitivity value according to the layering defect standard sample; judging whether the gain amplitude and the phase amplitude exceed the sensitivity value; and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified.
Preferably, after determining whether the gain amplitude and the phase amplitude exceed the sensitivity value, the method further includes: if the gain amplitude and the phase amplitude exceed sensitivity values, acquiring a probe abnormal frequency sweep display image according to the typical acoustic resonance detection picture library; judging whether the first similarity of the product frequency sweep display graph and the probe abnormal frequency sweep display graph is larger than a first preset threshold value or not; and if the first similarity of the product frequency sweep display graph and the probe abnormal frequency sweep display graph is larger than the first preset threshold value, replacing or repairing the probe.
Preferably, after determining whether the first similarity between the product frequency sweep display graph and the probe abnormal frequency sweep display graph is greater than a first predetermined threshold, the method further includes: if the first similarity of the product frequency sweep display graph and the probe abnormal frequency sweep display graph is smaller than the first preset threshold value, obtaining a 2 mm-depth layered defect frequency sweep display graph and a 8 mm-depth layered defect frequency sweep display graph according to the typical acoustic resonance detection picture library; judging whether a second similarity of the product sweep display graph and the 2 mm-depth layered defect sweep display graph and the 8 mm-depth layered defect sweep display graph is greater than a second preset threshold value; and if the second similarity of the product sweep display graph and the 2mm depth layered defect sweep display graph and the 8mm depth layered defect sweep display graph is larger than the second preset threshold value, evaluating the product internal quality grade according to a product quality evaluation standard.
Preferably, after the determining whether the second similarity between the product sweep display graph and the 2mm depth layered defect sweep display graph and the 8mm depth layered defect sweep display graph is greater than a second predetermined threshold, the method further includes: determining that the internal quality of the article is acceptable if the second similarity of the article sweep display graph to the 2mm depth layered defect sweep display graph and the 8mm depth layered defect sweep display graph is less than the second predetermined threshold.
Preferably, the preparing of the delamination defect standard comprises:
step 1: preparing type A defects and type B defects;
step 2: respectively preparing a first type composite material prefabricated layer and a second type composite material prefabricated layer;
and step 3: adhering the A-type defect and the B-type defect to the surface of the first-type composite prefabricated layer, covering the first-type composite prefabricated layer with a layer of the second-type composite prefabricated layer, and cutting holes with corresponding sizes and shapes at the positions of the second-type composite prefabricated layer corresponding to the A-type defect and the B-type defect;
and 4, step 4: laminating the two-type composite prefabricated layer with the cut holes on the one-type composite prefabricated layer adhered with the A-type defects and the B-type defects, so that the A-type defects and the B-type defects are embedded in the holes respectively; covering the first type composite material prefabricated layer on the second type composite material prefabricated layer;
and 5: repeating the step 3 and the step 4 according to the thickness of the composite material to be detected, so that the total thickness of the first-type composite material prefabricated layer and the second-type composite material prefabricated layer which are alternately laminated in sequence is equal to the thickness of the composite material to be detected, and the bottommost layer, the middle layer and the surface layer are the first-type composite material prefabricated layers;
step 6: and (5) curing and molding the multiple layers of materials alternately laminated in the step (5) by the same process as the composite material to be detected to obtain a standard sample of the lamination defects.
Preferably, the detection surface state of the product is a flat plate or a special-shaped structural part with the shape curvature radius not less than 100 mm.
Preferably, the article detection surface roughness is no greater than 12.6 μm.
Preferably, the prefabricated material comprises one of a prepreg cloth or a fiber cloth.
Preferably, the thickness of the first type composite prefabricated layer is 1/3 of the thickness of the composite to be detected, and the thickness of the second type composite prefabricated layer is the same as the thicknesses of the A type defects and the B type defects.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
the embodiment of the application provides a method for detecting the acoustic resonance of the internal quality of a porcelainized resin-based composite material obliquely-stacked winding product, which comprises the following steps: establishing a typical acoustic resonance detection picture library; obtaining a product frequency sweep display image; obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph; preparing a standard sample of the layering defect; obtaining a sensitivity value according to the layering defect standard sample; judging whether the gain amplitude and the phase amplitude exceed the sensitivity value; and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified. The method is used for solving the technical problem that in the prior art, as the ceramic resin composite material obliquely-stacked and wound product has the structural characteristics of nonuniform interior, anisotropy and the like and is closely related to the manufacturing process of the product, no corresponding detection standard sample and detection method exist in China. By preparing a typical artificial defect standard sample with the same process as a product, the method achieves the purposes of accurately identifying the position, size and type of the internal defect of the ceramic resin matrix composite obliquely-stacked and wound product, can effectively detect the harmful defects such as debonding, layering and the like in a certain range, greatly improves the detection rate of the internal harmful defect, ensures the consistency of detection quality and detection result, and has the technical effects of high sensitivity, high detection precision and high reliability.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of an acoustic resonance detection method for internal mass of a ceramifiable resin-based composite material obliquely-stacked wound product in an embodiment of the invention;
FIG. 2 is a schematic illustration of a composite preform layer according to an embodiment of the present invention;
FIG. 3 is a schematic view of a circular defect cut of a composite preform layer according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a standard sample of a delamination defect in an embodiment of the invention;
FIG. 5(a) is a schematic diagram illustrating a square defect cut of an upper carbon fiber cloth layer of the second type according to an embodiment of the present invention;
FIG. 5(b) is a schematic diagram illustrating a square defect cut of a lower carbon fiber cloth layer of the second type in the embodiment of the present invention;
FIG. 6 is a photograph of a layered defect sample object in an embodiment of the present invention.
Detailed Description
The embodiment of the application provides an acoustic resonance detection method for internal quality of a ceramizable resin matrix composite obliquely-overlapped wound product, and the acoustic resonance detection method is used for solving the technical problem that in the prior art, no corresponding detection standard sample and detection method exist in China due to the facts that the ceramizable resin matrix composite obliquely-overlapped wound product has structural characteristics of internal unevenness, anisotropy and the like and is closely related to a product manufacturing process.
In order to solve the technical problems, the technical scheme provided by the application has the following general idea: detecting a picture library by establishing typical acoustic resonance; obtaining a product frequency sweep display image; obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph; preparing a standard sample of the layering defect; obtaining a sensitivity value according to the layering defect standard sample; judging whether the gain amplitude and the phase amplitude exceed the sensitivity value; and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified. By preparing a typical artificial defect standard sample with the same process as a product, the method achieves the purposes of accurately identifying the position, size and type of the internal defect of the ceramic resin matrix composite obliquely-stacked and wound product, can effectively detect the harmful defects such as debonding, layering and the like in a certain range, greatly improves the detection rate of the internal harmful defect, ensures the consistency of detection quality and detection result, and has the technical effects of high sensitivity, high detection precision and high reliability.
The technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
Example one
Fig. 1 is a schematic flow chart of a method for detecting acoustic resonance of internal mass of a ceramifiable resin-based composite material obliquely-stacked wound product in an embodiment of the present invention, as shown in fig. 1, the method includes:
step 110: establishing a typical acoustic resonance detection picture library;
step 120: obtaining a product frequency sweep display image;
step 130: obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph;
step 140: preparing a standard sample of the layering defect;
step 150: obtaining a sensitivity value according to the layering defect standard sample;
step 160: judging whether the gain amplitude and the phase amplitude exceed the sensitivity value;
step 170: and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified.
Specifically, according to the acoustic resonance detection method for internal quality of the ceramizable resin-based composite obliquely-overlapped wound product provided by the embodiment of the invention, a typical artificial defect standard sample having the same process as the ceramizable resin-based composite obliquely-overlapped wound product is prepared, a typical acoustic resonance detection picture library is established, then a product frequency sweep display picture is obtained, further gain amplitude and phase amplitude of the product frequency sweep display picture on a display screen of acoustic resonance detection equipment are obtained, whether the gain amplitude and the phase amplitude of the product frequency sweep display picture exceed the sensitivity values of the layered defect standard sample is judged, and if the gain amplitude and the phase amplitude do not exceed the sensitivity values, the internal quality of the product can be determined to be qualified; if the gain amplitude and the phase amplitude exceed the sensitivity values, the product sweep frequency display graph is compared and analyzed with the probe abnormal acoustic resonance detection sweep frequency display graph, the 2mm deep layered defect acoustic resonance detection sweep frequency display graph and the 8mm deep layered defect acoustic resonance detection sweep frequency display graph in the typical acoustic resonance detection picture library, so that the technical effects of accurately identifying the position, the size and the type of the internal defect of the ceramic resin matrix composite material obliquely-wound product, effectively detecting the harmful defects such as debonding, layering and the like in a certain range, greatly improving the detection rate of the internal harmful defect and ensuring the consistency of the detection quality and the detection result are further achieved, and the acoustic resonance detection method for the internal quality of the ceramic resin matrix composite material obliquely-wound product provided by the embodiment of the invention has the advantages of high sensitivity, high sensitivity and the like, High detection precision and high reliability.
In step 110, the typical acoustic resonance detection photo library comprises a material internal quality sound resonance detection frequency sweep display graph, a probe abnormal sound resonance detection frequency sweep display graph, a 2mm depth layered defect sound resonance detection frequency sweep display graph and an 8mm depth layered defect sound resonance detection frequency sweep display graph. The method comprises the following steps of (1) displaying a graph of a frequency sweeping display of a part with good internal quality of a product material, wherein the maximum amplitude of gain on a display screen is not more than 40%, the maximum amplitude of phase is not more than 40%, and the waveform on the display screen is stable in the moving process of a probe and has no phenomenon and part of sudden fluctuation; the probe abnormal frequency sweeping display graph shows that the maximum gain amplitude far exceeds 100 percent on a display screen, the maximum phase amplitude far exceeds 100 percent, the waveform on the display screen is unstable in the moving process of the probe, the phenomenon of sudden fluctuation exists, the waveform is disordered and has no proportional relation; the 2mm depth layering defect frequency sweeping display graph is characterized in that the maximum gain amplitude on the display screen is far more than 100%, the maximum phase amplitude is far more than 100%, the waveform on the display screen is stable in the moving process of the probe, the phenomenon of sudden fluctuation is avoided, the waveform is regular, and the attenuation is reduced according to a certain proportion; the 8mm deep layering defect frequency sweeping display graph is characterized in that the maximum gain amplitude on the display screen can reach or slightly exceed 100%, the maximum phase amplitude can reach or slightly exceed 60%, the waveform on the display screen is stable in the moving process of the probe, the phenomenon of sudden fluctuation is avoided, the waveform is regular, and the waveform is attenuated and reduced according to a certain proportion.
In step 140, the preparing a standard sample of the delamination defect specifically includes:
step 1: preparing A-type defects and B-type defects, wherein the A-type defects and the B-type defects are formed by folding a polytetrafluoroethylene film with a melting point not lower than 300 ℃ and a single-layer thickness not greater than 0.015mm into two layers, and cutting the two layers into two side lengths according to an equal ratio of 1: 2 sequentially increasing square film blocks or round film blocks, wherein the minimum side length is 10mm multiplied by 10 mm; then sealing the periphery of the square film block or the circular film block to obtain the A-type defect and the B-type defect;
step 2: respectively preparing a first type composite material prefabricated layer and a second type composite material prefabricated layer, wherein the first type composite material prefabricated layer and the second type composite material prefabricated layer are both the same as the material and the composition of the composite material to be detected and are formed by laying or winding the prefabricated material, the prefabricated material is a ceramic resin-based prepreg tape or a fiber tape, the tape is cut into small sections according to an included angle of 45 degrees and is connected into long tapes in a sewing mode, and all fiber directions on the tape form an included angle of 45 degrees with the length direction of the tape; wherein the thickness of the first-type composite prefabricated layer is 1/3 of the thickness of the composite to be detected, and the thickness of the second-type composite prefabricated layer is the same as the thickness of the A-type defect and the thickness of the B-type defect, as shown in fig. 5(a) and 5 (B);
and step 3: adhering the A-type defects and the B-type defects to the surface of the first-type composite prefabricated layer, covering the first-type composite prefabricated layer with a layer of the second-type composite prefabricated layer, and cutting holes with corresponding sizes and shapes at the positions of the second-type composite prefabricated layer corresponding to the A-type defects and the B-type defects, as shown in FIG. 3;
and 4, step 4: laminating the two-type composite prefabricated layer with the cut holes on the one-type composite prefabricated layer adhered with the A-type defects and the B-type defects, so that the A-type defects and the B-type defects are respectively embedded in the holes; covering the first type composite material prefabricated layer on the second type composite material prefabricated layer;
and 5: repeating the step 3 and the step 4 according to the thickness of the composite material to be detected, so that the total thickness of the first-type composite material prefabricated layer and the second-type composite material prefabricated layer which are alternately laminated in sequence is equal to the thickness of the composite material to be detected, the bottommost layer, the middle layer and the topmost layer are the first-type composite material prefabricated layer, and the second-type ceramic resin-based composite material prefabricated layer is sequentially positioned on the second layer and the fourth layer; when the steps 3 and 4 are repeated, the vertical projections of the A-type defects and the B-type defects embedded in the two-type composite material prefabricated layer are not overlapped, as shown in FIG. 4;
step 6: and (3) curing and molding the multiple layers of materials formed by alternately laminating in the step (5) by the same process as the composite material to be detected to obtain a layering defect standard sample of the obliquely-laminated and wound composite material, as shown in figure 6.
The layering defect sample obtained in the step 140 and the product are both made of ceramifiable resin-based composite material obliquely-stacked and wound products with the thickness not greater than 9mm, and the technical methods of the layering defect sample and the products are obliquely-stacked and wound molding, wherein the obliquely-stacked and wound molding is to direct the winding direction of a cloth belt from a large end to a small end so as to form a heat-proof layer with a smooth airflow structure, the used prepreg cloth is a deformed cloth belt, namely, the prepreg cloth is firstly obliquely cut into the cloth belt with a certain width in a 45-degree direction (forming an angle of 45 degrees with the direction of the cloth belt yarn) and then connected into a continuous cloth belt, and the continuous cloth belt is favorable for being unfolded into a required continuous fan shape by means of applied tension during winding, so that the continuous cloth belt is well attached to the surface of the ceramifiable resin-based composite material obliquely-stacked and wound products.
In step 130, the detection surface state of the product is a flat plate or a special-shaped structural part with the outline curvature radius not less than 100mm, and the surface roughness is not more than 12.6 μm. The acoustic resonance detection equipment and the probe are combined, stable continuous wave excitation (transmission) and acoustic wave signal receiving are adopted, the frequency range is 20 kHz-40 kHz, the probe selects a fixed-distance transmission/reception BMP probe, the fixed-distance is not more than 20mm, the product is scanned in a direct contact coupling mode, the contact pressure between the probe and the product is uniformly and effectively controlled during scanning, the signal amplitude and phase of a display screen are ensured to be stable and clear, the scanning direction is parallel to the winding direction during product preparation, the winding direction is kept consistent with the obliquely-overlapped winding direction during movement, the angle is zero, the product frequency scanning display image is obtained, and the gain amplitude and the phase amplitude of the product frequency scanning display image on the display screen of the acoustic resonance detection equipment are further obtained. The acoustic resonance detection equipment has detection modes such as an acoustic resistance method, acoustic resonance, radio frequency transmission/reception and the like, can generate sweep frequency transmission/reception, pulse transmission/reception and radio frequency transmission/reception acoustic wave signals, has an upper frequency limit of 150kHz, can adjust a gain range from 0dB to 100dB, has a step of not more than 2dB, has double-track display, can compare a curve obtained by real-time measurement with a prestored completion area, can automatically identify the probe, automatically measures the probe parameters, and automatically sets an instrument according to the double-track display. The probe is provided with a distance transmitting/receiving probe (BMP), a resonance probe (BMR) and a mechanical impedance probe (BMM), wherein the frequency range of the distance transmitting/receiving probe is 2.5 kHz-150 kHz, and the distance is not more than 20 mm.
In step 150, in the process of adjusting the sensitivity according to the standard sample of the delamination defect, in order to ensure that the surface of the standard sample of the delamination defect is in good contact with the probe, the probe is moved to the intact position of the standard sample of the delamination defect, the acoustic resonance detection device automatically identifies the frequency in the layered defect standard and implements amplitude and phase zero automatic locking by sweeping the frequency within the frequency range, thereby realizing zero adjustment, then moving the probe to the upper surface corresponding to the A-type defect (the layering defect with the depth of 8 mm) of the layering defect standard sample, adjusting the gain and the phase of the acoustic resonance detection equipment to ensure that the defect display amplitude is 80% of the full scale of the display screen and the phase amplitude is 60% of the full scale of the display screen, the sensitivity value is the value, and the technical effect of providing a detection standard for detecting the internal quality of the ceramizable resin matrix composite material obliquely-overlapped wound product is further achieved.
In step 160, if the gain amplitude and the phase amplitude exceed the sensitivity value, obtaining a probe abnormal frequency sweep display image according to the typical acoustic resonance detection picture library; judging whether a first similarity between the product frequency sweep display diagram and the probe abnormal frequency sweep display diagram is greater than a first preset threshold value, wherein the first preset threshold value is a basis for judging that the product frequency sweep display diagram is similar to the probe abnormal frequency sweep display diagram, if the first similarity between the product frequency sweep display diagram and the probe abnormal frequency sweep display diagram is greater than the first preset threshold value, the product frequency sweep display diagram is similar to or identical to the probe abnormal frequency sweep display diagram, and if the probe is determined to be abnormal, the probe needs to be replaced or maintained; if the first similarity between the product frequency sweep display graph and the probe abnormal frequency sweep display graph is smaller than the first preset threshold, which indicates that the product frequency sweep display graph does not have the condition of probe abnormality, obtaining different-depth layered defect frequency sweep display graphs, namely a 2 mm-depth layered defect frequency sweep display graph and a 8 mm-depth layered defect frequency sweep display graph according to the typical acoustic resonance detection picture library; then, whether a second similarity of the product frequency sweep display graph and the 2mm depth layered defect frequency sweep display graph and the 8mm depth layered defect frequency sweep display graph is larger than a second preset threshold value is judged, wherein the second preset threshold value is a basis for judging that the product frequency sweep display graph is the same as or similar to the 2mm depth layered defect frequency sweep display graph and the 8mm depth layered defect frequency sweep display graph, if the second similarity of the product frequency sweep display graph and the 2mm depth layered defect frequency sweep display graph and the 8mm depth layered defect frequency sweep display graph is larger than the second preset threshold value, the product frequency sweep display graph is indicated to be the same as or similar to the 2mm depth layered defect frequency sweep display graph and the 8mm depth layered defect frequency sweep display graph, and the internal quality grade of the product is evaluated according to corresponding product quality evaluation standards, if necessary, CT detection or other nondestructive detection can be added to the layered defect part of the product, and the internal quality grade of the product is evaluated separately; if the second similarity of the product sweep display graph and the 2 mm-depth layered defect sweep display graph and the 8 mm-depth layered defect sweep display graph is smaller than the second preset threshold, the product sweep display graph is different from or dissimilar to the 2 mm-depth layered defect sweep display graph and the 8 mm-depth layered defect sweep display graph, that is, the product sweep display graph does not have defects of different depths, and the internal quality of the product is determined to be qualified.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
the embodiment of the application provides a method for detecting the acoustic resonance of the internal quality of a porcelainized resin-based composite material obliquely-stacked winding product, which comprises the following steps: establishing a typical acoustic resonance detection picture library; obtaining a product frequency sweep display image; obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph; preparing a standard sample of the layering defect; obtaining a sensitivity value according to the layering defect standard sample; judging whether the gain amplitude and the phase amplitude exceed the sensitivity value; and if the gain amplitude and the phase amplitude do not exceed the sensitivity value, determining that the internal quality of the product is qualified. The method is used for solving the technical problem that in the prior art, as the ceramic resin composite material obliquely-stacked and wound product has the structural characteristics of nonuniform interior, anisotropy and the like and is closely related to the manufacturing process of the product, no corresponding detection standard sample and detection method exist in China. By preparing a typical artificial defect standard sample with the same process as a product, the method achieves the purposes of accurately identifying the position, size and type of the internal defect of the ceramic resin matrix composite obliquely-stacked and wound product, can effectively detect the harmful defects such as debonding, layering and the like in a certain range, greatly improves the detection rate of the internal harmful defect, ensures the consistency of detection quality and detection result, and has the technical effects of high sensitivity, high detection precision and high reliability.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (5)
1. A method for detecting the internal mass acoustic resonance of a ceramifiable resin-based composite material obliquely-stacked winding product is characterized by comprising the following steps:
establishing a typical acoustic resonance detection photo library, wherein the typical acoustic resonance detection photo library comprises a material internal quality intact part acoustic resonance detection frequency sweep display graph, a probe abnormal acoustic resonance detection frequency sweep display graph, a 2mm depth layered defect acoustic resonance detection frequency sweep display graph and a 8mm depth layered defect acoustic resonance detection frequency sweep display graph;
obtaining a product frequency sweep display image;
obtaining gain amplitude and phase amplitude according to the product sweep frequency display graph;
preparing a standard sample of the layering defect;
obtaining a sensitivity value according to the layering defect standard sample;
judging whether the gain amplitude and the phase amplitude exceed the sensitivity value;
determining that the article interior quality is acceptable if the gain amplitude and phase amplitude do not exceed the sensitivity value;
if the gain amplitude and the phase amplitude exceed the sensitivity values, comparing and analyzing the product sweep frequency display graph with a probe abnormal acoustic resonance detection sweep frequency display graph, a 2mm depth layered defect acoustic resonance detection sweep frequency display graph and a 8mm depth layered defect acoustic resonance detection sweep frequency display graph in the typical acoustic resonance detection picture library;
if the gain amplitude and the phase amplitude exceed sensitivity values, acquiring a probe abnormal frequency sweep display image according to the typical acoustic resonance detection picture library;
judging whether the first similarity of the product frequency sweep display graph and the probe abnormal frequency sweep display graph is larger than a first preset threshold value or not;
replacing or repairing the probe if the first similarity of the product sweep display graph and the probe abnormal sweep display graph is greater than the first predetermined threshold;
if the first similarity of the product frequency sweep display graph and the probe abnormal frequency sweep display graph is smaller than the first preset threshold value, obtaining a 2 mm-depth layered defect frequency sweep display graph and a 8 mm-depth layered defect frequency sweep display graph according to the typical acoustic resonance detection picture library;
judging whether a second similarity of the product sweep display graph and the 2 mm-depth layered defect sweep display graph and the 8 mm-depth layered defect sweep display graph is greater than a second preset threshold value;
if the second similarity of the product frequency sweep display graph and the 2mm depth layering defect frequency sweep display graph and the 8mm depth layering defect frequency sweep display graph is larger than the second preset threshold value, evaluating the product internal quality grade according to a product quality evaluation standard;
determining that the internal quality of the article is acceptable if the second similarity of the article sweep display graph to the 2mm depth layered defect sweep display graph and the 8mm depth layered defect sweep display graph is less than the second predetermined threshold.
2. The method of claim 1, wherein the preparing a delamination defect standard comprises:
step 1: preparing type A defects and type B defects;
step 2: respectively preparing a first type composite material prefabricated layer and a second type composite material prefabricated layer;
and step 3: adhering the A-type defect and the B-type defect to the surface of the first-type composite prefabricated layer, covering the first-type composite prefabricated layer with a layer of the second-type composite prefabricated layer, and cutting holes with corresponding sizes and shapes at the positions of the second-type composite prefabricated layer corresponding to the A-type defect and the B-type defect;
and 4, step 4: laminating the two-type composite prefabricated layer with the cut holes on the one-type composite prefabricated layer adhered with the A-type defects and the B-type defects, so that the A-type defects and the B-type defects are embedded in the holes respectively; covering the first type composite material prefabricated layer on the second type composite material prefabricated layer;
and 5: repeating the step 3 and the step 4 according to the thickness of the composite material to be detected, so that the total thickness of the first-type composite material prefabricated layer and the second-type composite material prefabricated layer which are alternately laminated in sequence is equal to the thickness of the composite material to be detected, and the bottommost layer, the middle layer and the surface layer are the first-type composite material prefabricated layers;
step 6: and (5) curing and molding the multiple layers of materials alternately laminated in the step (5) by the same process as the composite material to be detected to obtain a standard sample of the lamination defects.
3. The method according to claim 1, wherein the product inspection surface condition is a flat plate member or a profile member having a curvature radius of not less than 100mm,
the surface roughness of the detection surface of the product is not more than 12.6 μm.
4. The method of claim 2, wherein the pre-fabricated layer of material comprises one of a prepreg cloth or a fiber cloth.
5. The method of claim 2, wherein the thickness of the preform layer of type one composite material is 1/3 of the thickness of the composite material to be tested, and the thickness of the preform layer of type two composite material is the same as the thickness of the type a defect and the type B defect.
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