CN111143993A - Glue joint repairing method for main bearing laminated board - Google Patents
Glue joint repairing method for main bearing laminated board Download PDFInfo
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- CN111143993A CN111143993A CN201911363608.XA CN201911363608A CN111143993A CN 111143993 A CN111143993 A CN 111143993A CN 201911363608 A CN201911363608 A CN 201911363608A CN 111143993 A CN111143993 A CN 111143993A
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Abstract
The embodiment of the invention discloses a glue joint repairing method of a main bearing laminated board, which comprises the following steps: carrying out engineering analysis of the stress form on the region to be repaired of the main bearing laminated board to determine the stress form of the region to be repaired; according to the repairing area of the main bearing laminated board and the determined stress form, a repairing scheme is made for the area to be repaired; determining a repair mode of a repair scheme according to the stress form of the area to be repaired; analyzing the use range of the repair mode of the repair scheme to obtain a use range analysis result; according to the stress characteristics and the application range analysis result of the main bearing laminated board, a repairing mode meeting the stress requirement of the main bearing laminated board is determined. The embodiment of the invention can determine an optimal repairing scheme for the main bearing plate made of the composite material, thereby realizing the effect of effectively reducing the weight of the structure.
Description
Technical Field
The present application relates to, but is not limited to, the technical field of structural strength, and particularly to a method for repairing a main bearing laminated board by gluing.
Background
The adhesive bonding repair is a commonly used repair method in the repair of the main bearing laminated plate structure of the composite material, and two commonly used repair processes are a patching method and a dredging method. The overall stress form of the structure is better by adopting what repairing form during repairing, and no better repairing scheme is provided for different structures at present.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention provides a bonding repair method of a main bearing laminated board, which can determine an optimal repair scheme for the main bearing board made of composite materials, thereby realizing the effect of effectively reducing the structural weight.
The embodiment of the invention provides a glue joint repairing method of a main bearing laminated board, which comprises the following steps:
carrying out engineering analysis of the stress form on the region to be repaired of the main bearing laminated board, and determining the stress form of the region to be repaired;
according to the repairing area of the main bearing laminated board and the determined stress form, a repairing scheme is made for the area to be repaired;
determining a repair mode of the repair scheme according to the stress form of the area to be repaired;
analyzing the use range of the repair mode of the repair scheme to obtain a use range analysis result;
and determining a repairing mode meeting the stress requirement of the main bearing laminated board according to the stress characteristics of the main bearing laminated board and the analysis result of the application range.
Optionally, in the glue joint repairing method of the main messenger laminated plate, the stress form of the area to be repaired includes: tensile, compressive, shear and bending stresses, and combination stresses including at least two of the aforementioned stresses.
Optionally, in the method of glue-on repair of a primary messenger laminate as described above, the repair protocol comprises: the repair method comprises patch repair and lap patch repair, and the repair method for patch repair comprises patch repair and lap patch repair.
Optionally, in the glue joint repairing method for the main messenger laminated plate, the method further comprises:
and carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated board to obtain a three-dimensional progressive damage strength analysis result.
Optionally, in the glue joint repairing method of the main bearing laminated plate, the rigidity degradation mode of the damage variable in the three-dimensional progressive damage strength analysis adopts a linear piecewise degradation mode.
Optionally, in the glue joint repairing method of the main messenger laminate, the performing three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main messenger laminate includes:
and in the process of carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated board, adopting a harcin failure criterion as a strength failure criterion.
Optionally, in the method for glue-bonding repair of a primary messenger laminate as described above, the strength failure criterion comprises: three orthogonal direction fiber failures, matrix failures, and delamination failures.
Optionally, in the glue joint repairing method for the main messenger laminated plate, the method further comprises:
and analyzing the damage failure mode and the damage bearing capacity of the three-dimensional progressive damage strength analysis result to obtain the damage failure mode and the damage bearing capacity of the region to be repaired.
Optionally, in the glue joint repairing method for the main messenger laminated plate, the method further comprises:
according to the comparison between the damage bearing capacity of the region to be repaired and the design bearing capacity of the main bearing laminated board, structural parameter optimization is carried out on the region to be repaired; wherein, the optimizing the structural parameters of the region to be repaired comprises: when the damage bearing capacity of the area to be repaired is larger than the design bearing capacity of the main bearing laminated board, carrying out layer laying weight reduction treatment on the area to be repaired; when the damage bearing capacity of the area to be repaired is smaller than the design bearing capacity of the main bearing laminated board, carrying out layering weight increasing treatment on the area to be repaired;
and repeatedly performing the steps of carrying out three-dimensional progressive damage strength analysis on the to-be-repaired area subjected to the ply weight reduction treatment or the ply weight increase treatment to carry out damage failure mode and damage bearing capacity analysis on the three-dimensional progressive damage strength analysis result until the damage bearing capacity of the to-be-repaired area is equal to the design bearing capacity of the main bearing laminated plate.
According to the glue joint repairing method of the main bearing laminated board provided by the embodiment of the invention, the advantages and the disadvantages of the structure under each scheme are given through the comparative analysis of patch patching repair, lap joint patching repair, patch patching repair and lap joint patching repair, so that a better repairing scheme is given, the strength evaluation analysis is carried out on the three-dimensional asymptotic damage failure mode and the failure load of the better structure scheme, and finally the optimal structure parameters are obtained, for example, the failure bearing capacity of the area to be repaired is equal to the design bearing capacity of the main bearing laminated board.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flow chart of a glue joint repairing method of a main bearing laminated board provided by the embodiment of the invention;
FIG. 2 is a schematic illustration of a patch repair in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of another patch repair in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of a lap patch repair in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of another lap patch repair in accordance with an embodiment of the present invention;
FIG. 6 is a schematic illustration of patch patching repair in an embodiment of the present invention;
FIG. 7 is a schematic illustration of another patch patching repair in an embodiment of the present invention;
FIG. 8 is a schematic illustration of a lap patch repair in accordance with an embodiment of the present invention;
FIG. 9 is a schematic illustration of another lap patch repair in accordance with an embodiment of the present invention;
fig. 10 is a flow chart of another method for repairing the adhesive joint of the main bearing laminated plate provided by the embodiment of the invention;
FIG. 11 is a diagram illustrating an exemplary setting of a lesion variable according to an embodiment of the present invention;
FIG. 12 is a schematic view of a composite stiffened panel of a form;
fig. 13 is a schematic diagram of a three-dimensional asymptotic damage analysis of a patch repair structure of the composite reinforced laminate structure shown in fig. 12.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a flow chart of a glue joint repairing method of a main bearing laminated board provided by the embodiment of the invention. The glue-bonding repair method of the main bearing laminated board provided by the embodiment can comprise the following steps:
s110, performing engineering analysis of the stress form on the region to be repaired of the main bearing laminated board, and determining the stress form of the region to be repaired;
s120, according to the repairing area of the main bearing laminated board and the determined stress form, a repairing scheme is formulated for the area to be repaired;
s130, determining a repair mode of a repair scheme according to the stress form of the area to be repaired;
s140, analyzing the use range of the repair mode of the repair scheme to obtain a use range analysis result;
s150, determining a repairing mode meeting the stress requirement of the main bearing laminated board according to the stress characteristics and the application range analysis result of the main bearing laminated board.
The gluing repair method of the main bearing laminated board provided by the embodiment of the invention provides advantages and disadvantages of various schemes and a better repair scheme aiming at the repair scheme of the composite material main bearing laminated board structure.
In the embodiment of the present invention, the stress form of the region to be repaired may include: tensile stress, compressive stress, shear stress and bending stress, and combined stress, wherein combined stress comprises at least two of the above stresses.
Optionally, the repair solution in the embodiment of the present invention may include: patching repair and patching repair. Wherein, the repair mode of the patching repair comprises the following steps: patch repair and lap patch repair, the repair mode of the patch repair comprising: patch patching repair and lap patch patching repair.
(1) Patch patching and repairing: the method has the advantages that the patch is easy to manufacture and simple to construct, has the defects of higher peeling stress of the edge of the patch and certain influence on the aerodynamic appearance, and is used for a permanent repair method of a composite material structure with smaller load and relative thinness.
FIG. 2 is a schematic illustration of a patch repair in an embodiment of the present invention, FIG. 3 is a schematic illustration of another patch repair in an embodiment of the present invention, FIG. 2 illustrates a single-sided patch repair, and FIG. 3 illustrates a double-sided patch repair.
(2) Lapping and patching repair: the asymmetry of the patch causes load eccentricity and higher peel stress in the edge bond line of the patch, which is more applicable to repair locations with less access space.
FIG. 4 is a schematic illustration of an alternative lap patch repair in an embodiment of the present invention, FIG. 5 is a schematic illustration of an alternative lap patch repair in an embodiment of the present invention, FIG. 4 illustrates a single-sided patch lap patch repair, and FIG. 5 illustrates a double-sided patch lap patch repair.
(3) Patch patching and repairing: the method is a repairing method for keeping the original structure appearance, the shearing stress distribution of the repairing method on the glued joint surface is uniform, and the repairing method is mostly applied to a thicker composite material laminated plate structure.
Fig. 6 is a schematic diagram of patch patching repair in an embodiment of the invention, fig. 7 is a schematic diagram of patch patching repair in another embodiment of the invention, fig. 6 illustrates a bevel-shaped patch patching repair mode, and fig. 7 illustrates a step-shaped patch repair mode.
(4) Lapping, repairing and repairing: the composite material patch is filled between the two mother boards to ensure that the thickness of the repair area is close to that of the original structure but not completely higher than the surface of the mother board, so that the structure appearance can be ensured, and the composite material patch is applicable to a form with smaller stress.
Fig. 8 is a schematic diagram of an overlap patch repair in an embodiment of the present invention, fig. 9 is a schematic diagram of another overlap patch repair in an embodiment of the present invention, fig. 8 illustrates an inclined-plane-shaped overlap patch repair manner, and fig. 9 illustrates a schematic diagram of a stepped overlap patch repair.
Optionally, fig. 10 is a flow chart of another method for repairing the bonded joint of the main messenger laminate according to the embodiment of the present invention. On the basis of the flow shown in fig. 1, the method provided by the embodiment of the present invention may further include:
and S160, carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated plate to obtain a three-dimensional progressive damage strength analysis result.
The rigidity degradation mode of the damage variable in the three-dimensional progressive damage strength analysis in the embodiment of the invention adopts a linear piecewise degradation mode.
Optionally, an implementation manner of S160 in the embodiment of the present invention may include:
and in the process of carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated board, adopting a Haxin (Hasion) failure criterion as a strength failure criterion.
The strength failure criterion in the embodiment of the invention may include: three orthogonal direction fiber failures, matrix failures, and delamination failures.
Optionally, the method provided in the embodiment of the present invention may further include:
s170, analyzing the damage failure mode and the damage bearing capacity of the three-dimensional progressive damage strength analysis result to obtain the damage failure mode and the damage bearing capacity of the area to be repaired.
Optionally, the method provided in the embodiment of the present invention may further include:
s180, optimizing structural parameters of the area to be repaired according to the comparison between the damaged bearing capacity of the area to be repaired and the designed bearing capacity of the main bearing laminated board; the implementation manner of performing structural parameter optimization on the region to be repaired may include: when the damage bearing capacity of the area to be repaired is larger than the design bearing capacity of the main bearing laminated board, carrying out layer laying and weight reduction treatment on the area to be repaired; when the damage bearing capacity of the area to be repaired is smaller than the design bearing capacity of the main bearing laminated board, carrying out layering weight increasing treatment on the area to be repaired;
and S190, repeating the steps from S160 to S170 on the area to be repaired after the ply weight reduction treatment or the ply weight increase treatment until the breaking bearing capacity of the area to be repaired is equal to the design bearing capacity of the main bearing laminated board.
Alternatively, in S180 of the embodiment of the present invention,
according to the glue joint repairing method of the main bearing laminated board provided by the embodiment of the invention, the advantages and the disadvantages of the structure under each scheme are given through the comparative analysis of patch patching repair, lap joint patching repair, patch patching repair and lap joint patching repair, so that a better repairing scheme is given, the strength evaluation analysis is carried out on the three-dimensional asymptotic damage failure mode and the failure load of the better structure scheme, and finally the optimal structure parameters are obtained, for example, the failure bearing capacity of the area to be repaired is equal to the design bearing capacity of the main bearing laminated board.
The following description will explain in detail the implementation of the glue-bonding repair method of the main bearing laminated board provided by the embodiment of the invention by a specific implementation example. The gluing and repairing method of the main bearing laminated board specifically comprises the following steps:
step 1, carrying out stress form engineering analysis (stress form tension, compression, shearing and bending) on the repair structure of the main bearing composite structural laminated board, and finding out the basic stress form of the structure;
step 2, aiming at the laminate repairing area, different repairing schemes of the structure are given: 4 repair schemes of patch patching repair, lap patch patching repair, patch patching repair and lap patch patching repair are adopted, and the repair forms are shown in figures 2 to 9;
and 3, judging the application range of different repair schemes according to the stress form: the advantages and disadvantages of patch patching repair, lap-joint patching repair, patch patching repair, lap-joint patching repair and the application range are described in detail in the above embodiments, and thus are not described again;
and 4, providing a composite structure main bearing laminated plate structure repairing scheme according to the advantages and the disadvantages of the repairing scheme and the application range: the patch is dug, repaired and repaired, the scheme can effectively meet the structural stress requirement and is suitable for a composite material laminate structure in a large-load stress form;
step 5, carrying out three-dimensional asymptotic damage analysis on the patch digging and repairing repair scheme, and adopting a Hasion (Haxin) failure criterion, wherein the failure criterion is set as: fiber failure, matrix failure and layered failure in three orthogonal directions, wherein the rigidity degradation mode of the damage variable is a linear piecewise function formula, and is a schematic diagram of the setting mode of the damage variable in the embodiment of the invention as shown in fig. 11;
and 6, calculating and analyzing progressive damage numerical values of the patch patching repair scheme to obtain a repair area laminate damage mode which is the press-breaking of the matrix and the fibers in the repair area, wherein the final damage of the laminate is caused by the fact that the repair glue is used for repairing the circular holes and the upper edge area and the lower edge area of the laminate.
The method provided by the embodiment of the invention is suitable for the adhesive bonding repair of the main structure of the composite material, has a high application value, and is verified in a centralized load-carrying structure of a certain type. As shown in fig. 12, the structural diagram of the composite material reinforced laminate of a certain forming machine is shown, the structure is subjected to a large load, the composite material skin is damaged, four repairing methods are adopted for repairing, and the comparison of the four structural schemes shows that the repairing method for repairing the patch effectively reduces the structural stress, reduces the structural weight and reduces the weight by 17%.
And carrying out three-dimensional asymptotic damage analysis on the patch patching repair structure, giving out the damage condition of each layer of the laminate in the repair area, wherein the damage mode is fiber pressure-breaking damage, and the pressure-breaking part is along the repair corner part. And the residual compressive strength of the laminate at the position of numerical calculation is well consistent with the test result. Fig. 13 is a schematic diagram illustrating a three-dimensional asymptotic damage analysis of a patch repair structure of the composite reinforced laminate structure shown in fig. 12.
Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A glue-bonding repairing method of a main bearing laminated board is characterized by comprising the following steps:
carrying out engineering analysis of the stress form on the region to be repaired of the main bearing laminated board, and determining the stress form of the region to be repaired;
according to the repairing area of the main bearing laminated board and the determined stress form, a repairing scheme is made for the area to be repaired;
determining a repair mode of the repair scheme according to the stress form of the area to be repaired;
analyzing the use range of the repair mode of the repair scheme to obtain a use range analysis result;
and determining a repairing mode meeting the stress requirement of the main bearing laminated board according to the stress characteristics of the main bearing laminated board and the analysis result of the application range.
2. The glue joint repair method of a main messenger laminate according to claim 1, characterized in that the stressed form of the area to be repaired comprises: tensile, compressive, shear and bending stresses, and combination stresses including at least two of the aforementioned stresses.
3. The glue joint repair method of a primary messenger laminate according to claim 1 wherein the repair protocol comprises: the repair method comprises patch repair and lap patch repair, and the repair method for patch repair comprises patch repair and lap patch repair.
4. The glue joint repair method of the main messenger laminate of claim 1 further comprising:
and carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated board to obtain a three-dimensional progressive damage strength analysis result.
5. The glue joint repair method of a main laminated messenger according to claim 4, characterized in that the stiffness degradation mode of the damage variables in the three-dimensional progressive damage strength analysis is a linear piecewise degradation mode.
6. The glue joint repair method of a main laminated messenger according to claim 5, wherein the three-dimensional progressive damage strength analysis of the determined repair mode meeting the stress requirements of the main laminated messenger comprises:
and in the process of carrying out three-dimensional progressive damage strength analysis on the determined repairing mode meeting the stress requirement of the main bearing laminated board, adopting a harcin failure criterion as a strength failure criterion.
7. The method of glue joint repair of a primary messenger laminate according to claim 6 wherein the strength failure criteria include: three orthogonal direction fiber failures, matrix failures, and delamination failures.
8. The glue joint repair method of the main messenger laminate of claim 4, further comprising:
and analyzing the damage failure mode and the damage bearing capacity of the three-dimensional progressive damage strength analysis result to obtain the damage failure mode and the damage bearing capacity of the region to be repaired.
9. The glue joint repair method of the main messenger laminate of claim 8, further comprising:
according to the comparison between the damage bearing capacity of the region to be repaired and the design bearing capacity of the main bearing laminated board, structural parameter optimization is carried out on the region to be repaired; wherein, the optimizing the structural parameters of the region to be repaired comprises: when the damage bearing capacity of the area to be repaired is larger than the design bearing capacity of the main bearing laminated board, carrying out layer laying weight reduction treatment on the area to be repaired; when the damage bearing capacity of the area to be repaired is smaller than the design bearing capacity of the main bearing laminated board, carrying out layering weight increasing treatment on the area to be repaired;
and repeatedly performing the steps of carrying out three-dimensional progressive damage strength analysis on the to-be-repaired area subjected to the ply weight reduction treatment or the ply weight increase treatment to carry out damage failure mode and damage bearing capacity analysis on the three-dimensional progressive damage strength analysis result until the damage bearing capacity of the to-be-repaired area is equal to the design bearing capacity of the main bearing laminated plate.
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| CN201911363608.XA CN111143993A (en) | 2019-12-25 | 2019-12-25 | Glue joint repairing method for main bearing laminated board |
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| CN201911363608.XA CN111143993A (en) | 2019-12-25 | 2019-12-25 | Glue joint repairing method for main bearing laminated board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113734462A (en) * | 2021-06-10 | 2021-12-03 | 江苏航空职业技术学院 | Skin maintenance method for sports aircraft |
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- 2019-12-25 CN CN201911363608.XA patent/CN111143993A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113734462A (en) * | 2021-06-10 | 2021-12-03 | 江苏航空职业技术学院 | Skin maintenance method for sports aircraft |
| CN113734462B (en) * | 2021-06-10 | 2023-08-15 | 江苏航空职业技术学院 | Skin maintenance method for sports aircraft |
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