CN112706501A - Processing method of composite laminated plate mechanical property test sample - Google Patents
Processing method of composite laminated plate mechanical property test sample Download PDFInfo
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- CN112706501A CN112706501A CN202011589232.7A CN202011589232A CN112706501A CN 112706501 A CN112706501 A CN 112706501A CN 202011589232 A CN202011589232 A CN 202011589232A CN 112706501 A CN112706501 A CN 112706501A
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- epoxy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/18—Handling of layers or the laminate
- B32B38/1858—Handling of layers or the laminate using vacuum
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sampling And Sample Adjustment (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a processing method of a test sample for testing the mechanical property of a composite material laminated plate, which comprises the steps of bonding an epoxy plate reinforcing sheet and a positioning epoxy plate into a laminated plate with an interlayer structure, curing, carrying out numerical control milling on the cured laminated plate with the interlayer structure, removing the positioning epoxy plate coated with a release agent on the upper side and the lower side of a part test sample and a residual adhesive tape for auxiliary fixation after the processing is finished, and obtaining a test piece for testing the mechanical property of the composite material. The method reduces the layering caused by the mechanical processing of the composite laminated plate, effectively improves the bonding quality stability of the reinforcing sheet and the working efficiency of sample processing, has wide application range and improves the production and processing efficiency.
Description
Technical Field
The invention relates to the field of composite material tests, in particular to a processing method of a composite material test sample.
Background
The composite material has the advantages of small density, high specific strength, high specific stiffness, excellent corrosion resistance, excellent mechanical property designability and the like, and is widely applied to the fields of aerospace, ships, energy chemical industry, automobiles and the like. Due to the diversity of the ply angle of the composite material laminated plate and the complex and multiple orderliness of the production process, the understanding of the mechanical property of the composite material laminated plate is immature at present, a uniform standard is not formed, in order to ensure the safety and the reliability of the composite material laminated plate structure, a large amount of tests are still needed to research the mechanical property and the damage rule of the composite material laminated plate, and a foundation is laid for reasonably describing the mechanical behavior of the composite material laminated plate.
The test sample piece for testing the mechanical property of the composite laminated plate has multiple processing procedures and mainly comprises hot press forming of the laminated plate, machining of a test sample, bonding of a reinforcing sheet, bonding of a strain gauge and the like. Due to the particularity of the composite material, the defects of layering, burrs, tearing and the like are easy to occur in the traditional machining process, and the performance and the service life of the composite material are seriously influenced. In order to further improve the surface quality of the composite laminated board after machining and reduce the occurrence of delamination phenomenon during machining, it is necessary to provide an improved method for machining.
The standards such as GB/T1446-. The method is purely manual operation, and has the problems that the thickness of a bonded glue layer is difficult to control, the positioning error of the bonding positions of the upper reinforcing sheet and the lower reinforcing sheet is large, and the like. When the thickness of the glue layer is too thick, internal stress is increased; when the thickness of the adhesive layer is too thin, the adhesive surface is easy to have the phenomenon of adhesive shortage, so that the adhesive strength is poor; in addition, the bonding positions of the upper and lower reinforcing sheets are staggered, so that the phenomenon of uneven stress of the laminated plate is caused; the accuracy of the mechanical property test of the composite laminated plate can be influenced by the conditions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the processing method of the test sample for the mechanical property test of the composite laminated plate, which can reduce the layering caused by the mechanical processing of the composite laminated plate and effectively improve the bonding quality stability of the reinforcing sheet and the working efficiency of sample processing.
The technical scheme adopted by the invention for solving the technical problem comprises the following detailed steps:
1) preparing 6 epoxy boards, wherein 4 epoxy board reinforcing sheets are prepared, 2 epoxy boards are prepared, and the sizes of the epoxy board reinforcing sheets and the epoxy board positioning sheets are determined according to the standard sizes of different mechanical property test samples in the national standard;
2) polishing the surfaces to be bonded of the composite laminated plate and the 4 epoxy plate reinforcing sheets to be bonded by using a pneumatic grinding wheel to ensure uniform polishing traces, and cleaning and airing the polished composite laminated plate and the 4 epoxy plate reinforcing sheets by using acetone;
3) uniformly coating the surfaces of the 2 positioning epoxy boards with an NC700 release agent twice, wherein the interval between the two coatings is more than 15 minutes, and naturally drying;
4) c, pasting J-95 medium-temperature curing structural adhesive films with equal areas on the surfaces to be bonded of the 4 epoxy board reinforcing sheets dried in the step 2;
5) bonding 2 epoxy plate reinforcing sheets and 1 positioning epoxy plate which are dried on the upper surface of the composite material laminated plate, wherein the positioning ring oxygen plate is positioned in the middle, the two epoxy plate reinforcing sheets are positioned on two sides, the total area of the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate is the same as that of the composite material laminated plate, the mutual connection direction of the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate is taken as the longitudinal direction, and the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate are subjected to auxiliary fixing by using an adhesive tape in the longitudinal direction, so that the positions of the three epoxy plates are ensured not to move; bonding the rest 2 epoxy plate reinforcing pieces and 1 positioning epoxy plate on the lower surface of the laminated plate, positioning the epoxy plate in the middle, positioning the two epoxy plate reinforcing pieces on the two sides, wherein the total area of the 2 epoxy plate reinforcing pieces and the 1 positioning epoxy plate is the same as that of the composite laminated plate, and using an adhesive tape to perform auxiliary fixation on the three epoxy plates in the longitudinal direction so as to ensure that the positions of the three epoxy plates do not move; obtaining a sandwich structure laminated board;
6) vacuum packaging the interlayer structure laminated board bonded with the epoxy board, setting an autoclave program according to J-95 medium temperature curing structure adhesive film curing process parameters, and curing for 3 hours at the temperature of 130 ℃ under the condition of 150 KPa;
7) placing the cured sandwich structure laminated plate on a workbench of a numerical control milling machine, and fixing the sandwich structure laminated plate by using a pressing block;
8) and (3) carrying out numerical control milling on the laminated plate with the sandwich structure according to the design size of the sample, and removing the positioning epoxy plates coated with the release agent on the upper side and the lower side of the part sample and the residual adhesive tape for auxiliary fixation after the processing is finished to obtain a test piece for testing the mechanical property of the composite material.
The 6 epoxy boards are 3240 epoxy boards with the thickness of 2 mm.
And in the step 5), the bonding positions of the epoxy plates on the upper surface and the lower surface of the composite material laminated plate completely correspond to each other.
In the step 5), the size of the positioning epoxy plate on the lower surface is larger than that of the sandwich structure laminated plate in the transverse position of the sandwich structure laminated plate, namely, the positioning epoxy plate protrudes out of the laminated plate, so that the curing processing is facilitated.
The invention has the beneficial effects that:
1) the positioning mode of the reinforcing sheet is simple and accurate, and the error in the bonding process is reduced;
2) the adhesive film is heated, pressurized and cured by using the autoclave, so that the gluing quality of the reinforcing sheet and the laminated plate is greatly improved;
3) the epoxy plate is bonded on the surface of the laminated plate, so that the surface of the laminated plate is protected from indentation under the condition that the laminated plate is tightly pressed by a machine tool, the phenomena of layering, burrs and the like generated in the mechanical processing process of the laminated plate are greatly reduced, and the surface quality of numerical control milling processing of the laminated plate is obviously improved;
4) the application range is wide, and the method can be used for processing a plurality of composite material laminated plate test pieces;
5) the production and processing efficiency is improved.
Drawings
FIG. 1 is a schematic view of the composite laminate bonding reinforcement sheet of the present invention.
The adhesive tape comprises a 1-composite material laminated board, a 2-J-95 medium-temperature curing structural adhesive film, 3, 5, 6 and 8-epoxy board reinforcing sheets, 4 and 7-positioning epoxy boards and 9-high-temperature-resistant paper adhesive tapes.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1, the specific steps of the processing method of the composite material laminated plate mechanical property test sample provided by the invention are described as follows:
the method comprises the following steps: preparing 4 epoxy plate reinforcing sheets (3), (5), (6) and (8) with the thickness of 2mm, and 2 positioning epoxy plates (4) and (7) with the thickness of 2mm, respectively marking corresponding marks on one side of each epoxy plate, wherein the size of each epoxy plate is determined according to the specification of a test sample;
step two: polishing the surfaces to be bonded of the composite material laminated plate (1) and the four epoxy plate reinforcing sheets (3), (5), (6) and (8) by using a pneumatic grinding wheel to ensure uniform polishing traces, and cleaning and airing the surfaces by using acetone;
step three: uniformly coating the surfaces of the positioning epoxy plates (4) and (7) with an NC700 release agent twice, wherein the interval between the two coatings is 15 minutes, and naturally drying;
step four: adhering J-95 medium-temperature curing structural adhesive films (2) with equal areas to the surfaces to be adhered of the 4 epoxy board reinforcing sheets (3), (5), (6) and (8) dried in the step (2);
step five: sequentially bonding 2 epoxy plate reinforcing pieces (6), (8) and 1 positioning epoxy plate (7) which are dried on the upper surface of the laminated plate according to the sequence of the epoxy plate reinforcing pieces, the positioning epoxy plate and the epoxy plate reinforcing pieces, wherein the positioning ring oxygen plate is positioned in the middle, the two epoxy plate reinforcing pieces are positioned on two sides, the total area of the 2 epoxy plate reinforcing pieces and the 1 positioning epoxy plate is the same as that of the composite material laminated plate, the mutual connection direction of the 2 epoxy plate reinforcing pieces and the 1 positioning epoxy plate is taken as the longitudinal direction, and three epoxy plates are subjected to auxiliary fixing by using a high-temperature-resistant paper adhesive tape (9) in the longitudinal direction, so that the positions of the three epoxy plates are ensured not to move; according to the method, the remaining 2 epoxy plate reinforcing pieces (3) and (5) and 1 positioning epoxy plate (4) are bonded on the lower surface of the laminated plate, and three epoxy plates are secondarily fixed by using a high-temperature-resistant paper adhesive tape (9) to ensure that the positions of the three epoxy plates do not move, and the bonding positions of the epoxy plates on the two sides of the laminated plate are completely aligned; forming a sandwich structure laminated plate, wherein the positioning epoxy plate (4) on the lower surface is larger than the size of the laminated plate, and a protrusion is arranged in the transverse direction of the sandwich structure laminated plate;
step six: vacuum packaging the laminated board bonded with the epoxy board, setting an autoclave program according to J-95 medium temperature curing structural adhesive film curing process parameters, and curing for 3 hours at 150KPa and 130 ℃;
step seven: placing the cured laminated plate with the interlayer structure on a workbench of a numerical control milling machine, and fixing the laminated plate by using a pressing block;
step eight: and (3) carrying out numerical control milling on the laminated plate with the sandwich structure according to the design size of the sample, and removing the positioning epoxy plates coated with the release agent on the upper side and the lower side of the part sample and the residual adhesive tape for auxiliary fixation after the processing is finished to obtain a test piece for testing the mechanical property of the composite material.
Claims (4)
1. A processing method of a mechanical property test sample of a composite laminated plate is characterized by comprising the following steps:
1) preparing 6 epoxy boards, wherein 4 epoxy board reinforcing sheets are prepared, 2 epoxy boards are prepared, and the sizes of the epoxy board reinforcing sheets and the epoxy board positioning sheets are determined according to the standard sizes of different mechanical property test samples in the national standard;
2) polishing the surfaces to be bonded of the composite laminated plate and the 4 epoxy plate reinforcing sheets to be bonded by using a pneumatic grinding wheel to ensure uniform polishing traces, and cleaning and airing the polished composite laminated plate and the 4 epoxy plate reinforcing sheets by using acetone;
3) uniformly coating the surfaces of the 2 positioning epoxy boards with an NC700 release agent twice, wherein the interval between the two coatings is more than 15 minutes, and naturally drying;
4) c, pasting J-95 medium-temperature curing structural adhesive films with equal areas on the surfaces to be bonded of the 4 epoxy board reinforcing sheets dried in the step 2;
5) bonding 2 epoxy plate reinforcing sheets and 1 positioning epoxy plate which are dried on the upper surface of the composite material laminated plate, wherein the positioning ring oxygen plate is positioned in the middle, the two epoxy plate reinforcing sheets are positioned on two sides, the total area of the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate is the same as that of the composite material laminated plate, the mutual connection direction of the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate is taken as the longitudinal direction, and the 2 epoxy plate reinforcing sheets and the 1 positioning epoxy plate are subjected to auxiliary fixing by using an adhesive tape in the longitudinal direction, so that the positions of the three epoxy plates are ensured not to move; bonding the rest 2 epoxy plate reinforcing pieces and 1 positioning epoxy plate on the lower surface of the laminated plate, positioning the epoxy plate in the middle, positioning the two epoxy plate reinforcing pieces on the two sides, wherein the total area of the 2 epoxy plate reinforcing pieces and the 1 positioning epoxy plate is the same as that of the composite laminated plate, and using an adhesive tape to perform auxiliary fixation on the three epoxy plates in the longitudinal direction so as to ensure that the positions of the three epoxy plates do not move; obtaining a sandwich structure laminated board;
6) vacuum packaging the interlayer structure laminated board bonded with the epoxy board, setting an autoclave program according to J-95 medium temperature curing structure adhesive film curing process parameters, and curing for 3 hours at the temperature of 130 ℃ under the condition of 150 KPa;
7) placing the cured sandwich structure laminated plate on a workbench of a numerical control milling machine, and fixing the sandwich structure laminated plate by using a pressing block;
8) and (3) carrying out numerical control milling on the laminated plate with the sandwich structure according to the design size of the sample, and removing the positioning epoxy plates coated with the release agent on the upper side and the lower side of the part sample and the residual adhesive tape for auxiliary fixation after the processing is finished to obtain a test piece for testing the mechanical property of the composite material.
2. The processing method of the composite material laminated plate mechanical property test sample according to claim 1, characterized in that:
the 6 epoxy boards are 3240 epoxy boards with the thickness of 2 mm.
3. The processing method of the composite material laminated plate mechanical property test sample according to claim 1, characterized in that:
and in the step 5), the bonding positions of the epoxy plates on the upper surface and the lower surface of the composite material laminated plate completely correspond to each other.
4. The processing method of the composite material laminated plate mechanical property test sample according to claim 1, characterized in that:
in said step 5), the size of the positioning epoxy plate of the lower surface is larger than the size of the sandwich laminate at the transverse position of the sandwich laminate, i.e. the positioning epoxy plate protrudes out of the laminate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011589232.7A CN112706501A (en) | 2020-12-29 | 2020-12-29 | Processing method of composite laminated plate mechanical property test sample |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011589232.7A CN112706501A (en) | 2020-12-29 | 2020-12-29 | Processing method of composite laminated plate mechanical property test sample |
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| CN112706501A true CN112706501A (en) | 2021-04-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188869A (en) * | 2021-05-13 | 2021-07-30 | 中国电子科技集团公司第二十研究所 | Tool for preparing composite material test sample piece and test sample piece preparation method |
| CN114103165A (en) * | 2021-11-12 | 2022-03-01 | 中航西安飞机工业集团股份有限公司 | Forming device and forming method for sample with reinforcing sheet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674634A (en) * | 2012-09-17 | 2014-03-26 | 中航惠腾风电设备股份有限公司 | Device and method for precisely producing fiber reinforced plastic composite laminate compression performance test piece |
| CN110926894A (en) * | 2019-11-28 | 2020-03-27 | 中国航空工业集团公司基础技术研究院 | Preparation method of composite material compression performance test piece |
-
2020
- 2020-12-29 CN CN202011589232.7A patent/CN112706501A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674634A (en) * | 2012-09-17 | 2014-03-26 | 中航惠腾风电设备股份有限公司 | Device and method for precisely producing fiber reinforced plastic composite laminate compression performance test piece |
| CN110926894A (en) * | 2019-11-28 | 2020-03-27 | 中国航空工业集团公司基础技术研究院 | Preparation method of composite material compression performance test piece |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188869A (en) * | 2021-05-13 | 2021-07-30 | 中国电子科技集团公司第二十研究所 | Tool for preparing composite material test sample piece and test sample piece preparation method |
| CN113188869B (en) * | 2021-05-13 | 2022-11-15 | 中国电子科技集团公司第二十研究所 | Tool for preparing composite material test sample piece and test sample piece preparation method |
| CN114103165A (en) * | 2021-11-12 | 2022-03-01 | 中航西安飞机工业集团股份有限公司 | Forming device and forming method for sample with reinforcing sheet |
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Application publication date: 20210427 |