This standard is applicable to the preparation of unidirectional fiber reinforced plastic flat plates for testing by winding method and vacuum bag-autoclave method. GB/T 4550-1984 Preparation of unidirectional fiber reinforced plastic flat plates for testing GB/T4550-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T4550-1984
Preparation of unidirectional fiber reinforced plastic flat plates for testing 1985-06-01
State Administration of Building Materials Industry
Page 1
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Preparation of unidirectional fiber reinforced plastic flat plates for testing" Data No.:
4550-1984
1 Winding method
Preparation steps.
2 Vacuum bag-autoclave method
2.1 Equipment
3 Inspection
4 Test report
Additional instructions:
Process auxiliary materials
Preparation Preparation steps
Page 2
《Preparation of unidirectional fiber reinforced plastic flat plates for test》
Data compilation
4550-1984
This standard applies to the preparation of unidirectional fiber reinforced plastic flat plates for test by winding method and vacuum bag-autoclave method. National
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Fiber reinforced plastic flat plates
4550-1984
Page 3
1 Winding method
The winding method is to use resin-impregnated fibers to continuously wind on the core mold to the required number of layers, and then pressurize and cure through a pressing plate to obtain two test flat plates at a time. The size of each plate is preferably 270mm×270mm. 1.1 Equipment
1.1.1 Winding machine. It consists of a yarn rack, a tension control device, a rubber groove, a ring winding drive mechanism and other parts (a rubber groove is not required for dry winding).
1.1.1.1 Yarn rack. It is used to place fiber yarn balls, which can be placed upright or horizontally. When placed horizontally, the yarn ball axis must have a certain braking force to prevent the yarn ball from loosening.
1.1.1.2 Tension control device. Generally, mechanical friction method or electromagnetic force method can be used. During the entire winding process, the tension should remain stable. Generally, it is 58% of the ultimate strength of the fiber. 1.1.1.3 Rubber groove. The rubber groove should be equipped with a constant temperature device. It mainly consists of an inlet guide roller, an outlet winding nozzle, and a guide roller in the rubber groove. The schematic diagram is shown in Figure 1 (Figure omitted). 1.1.1.4 Driving mechanism. It can make the fibers evenly and parallelly spread on the surface of the core mold. Its speed is 030r/min. The yarn sheet width should be 1~3mm.
1.1.2 Mold. The winding tool consists of a steel core mold and two pressing plates. The dimensions and technical requirements of the mold are shown in Figures 2a, 2b, and 2c (Figure omitted).
1.1.3 Oven or press. The oven or press must have a temperature control device that can meet the curing requirements, and the temperature control accuracy is ±°C.
1.2 Preparation steps
Adjust the fiber state according to the specified environmental conditions. 1.2.1
1.2.2 Select the yarn sheet width. Adjust the winding machine and calculate the number of winding layers according to formula (1). Vf.of.tb
Where: N—number of winding layers:
Vf—fiber volume content of fiber reinforced plastic board. %: of—fiber density, g/cm3;
t——board thickness, cm;
（1）
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Unidirectional fiber
Reinforced plastic flat plate
4550-1984
b—yarn sheet width, cm;
Y—line density of fiber bundle, g/km.
Note: Yarn sheet width refers to the distance that the yarn sheet moves along the axial direction when the core mold rotates one circle. 1.2.3 Install the core mold coated with release agent or covered with release sheet on the core shaft of the winding machine. 1.2.4 Adjust the temperature of the core shaft to make it close to the temperature of the glue solution, and the maximum temperature difference shall not exceed ±5℃. 1.2.5
Inject the glue solution into the glue tank and adjust the glue solution to the specified temperature. 1.2.6 Lead the fiber end from the yarn frame and make it pass through the roller of the glue groove, the tension control device, the wire nozzle, and finally fix it to the core mold.
1.2.7 Adjust the tension control device so that the fiber tension meets the requirements of the winding process. 1.2.8 Wind to the specified number of layers and bake in a rotating state to make the glue liquid evenly saturate the fiber. 1.2.9 Place the wrapped flat plate together with the core mold between the two pressure plates, and place pads to control the thickness at the four corners. When using a press to cure, put it directly into the press, pressurize the upper and lower pressure plates of the mold to contact the pads, and then use a sharp knife to cut the fibers at both ends of the core mold. When using an oven to cure, tighten the pressure with bolts to make the upper and lower pressure plates contact the pads, and then cut the fibers at both ends of the core mold and put it into the oven. 1.2.10 Cure at the specified temperature and time. 1.2.11 Naturally cool to room temperature, disassemble the mold, and take out the flat plate. Wipe the mold and demoulding sheet clean for reuse. 1.2.12 Trim the removed flat plate and cut off 15mm perpendicular to the fiber edge. Page 5
Unidirectional fiber
Making of flat plate
4550-1984
2 Vacuum bag-autoclave method
The vacuum bag-autoclave method is to stack a certain amount of pre-made materials and various process auxiliary materials to form a vacuum bag system, and solidify and form a 400X400mm plate in the autoclave at appropriate temperature and pressure. The combination of various materials in the vacuum bag system is shown in Figure 3 (Figure omitted).
2.1 Equipment
2.1.1 Autoclave. Hot pressing should meet the following requirements: a. Have a temperature control system that can meet the curing system. The general temperature control capacity should not be less than 200℃. The temperature control accuracy is soil℃. b. Have a hot pressing system that can meet the curing system. The general pressure control capacity is not less than 7kgf/cm2. The pressure control accuracy is 0.2kgf/cm2.
2.1.2 Vacuum system. The vacuum system should make the vacuum degree in the autoclave vacuum bag reach at least 700mmHg. 2.2 Process auxiliary materials
The process auxiliary materials used should meet the requirements of curing conditions. 2.2.1 Cutting plate. The cutting plate is a 400mm×400mm hard aluminum plate, and the fiber cutting direction should be marked on the plate. 2.2.2 Vacuum bag material. Balloon cloth, 1-2mm thick rubber sheet or 0.05 thick nylon film can be used. 2.2.3 Vacuum bag material. Coarse glass cloth or synthetic fiber felt can be used. 2.2.4 Metal upper pressure plate. Aluminum plate with a thickness of 165-2.0mm and a size of 400mm can be used. Holes with a diameter not greater than 2mm are evenly distributed on the plate, and the density is 200-250 holes per square meter. 2.2.5 Perforated isolation layer. Perforated polytetrafluoroethylene glass cloth or perforated anti-sticking plastic film can be used. 2.2.6 Perforated demoulding cloth. 0.1mm thick perforated polytetrafluoroethylene glass cloth can be used. 2.2.7 Glue-absorbing material. 0.10-0.20mm thick glass cloth or filter paper can be used. 2.2.8 Isolation film and demoulding agent. The isolation film can be non-adhesive polytetrafluoroethylene glass cloth or anti-sticking plastic film. Silicone grease can be used as the demoulding agent.
2.2.9 Metal bottom template. Aluminum plate with a thickness of 1.5-2.0mm and a size of 430mm×430mm can be used. 2.2.10 Peripheral stop strip. Its length is 400mm, width is 5-10mm, and thickness depends on the thickness of the plate to be made. Vulcanized or unvulcanized rubber strips can be used.
Peripheral sealing strip. A pressure-sensitive tape with a width of 20 to 30 mm can be used. 2.2.12 Sealing strip. Sealing rubber putty strips, such as XM-37, can be used. Page 6
Test
Preparation of unidirectional fiber-reinforced plastic flat plates
4550-1984
2.3 Preparation steps
2.3.1 Take out the sealed prepreg bag from the low-temperature box, place it in an environment with a temperature of 23±2℃ and a temperature of 55±5%, and adjust the state according to the following regulations: if the prepreg in the bag does not exceed 1kg, place it for at least 1h; if it exceeds 1kg, place it for at least 2h, and unseal it in the direction.
2.3.2 Cut the prepreg of 400mmX400mm according to the cutting template. The number of prepreg layers is calculated according to formula (2): t.of.vfWww.bzxZ.net
wherein: Na——number of prepreg layers;
t—sheet thickness, cm;
af——fiber density, g/cm3;
Vf——fiber volume content of fiber reinforced plastic board, %: ·(2)
Gpf—fiber weight per unit area of ​​prepreg, g/gm2. 2.3.3. Lay the cut prepreg layer by layer in the specified direction. The angle direction error shall not be greater than ±1°. After laying, weigh the prepreg bad material.
Apply the metal bottom template and the upper pressure plate with a release agent. Calculate the number of layers of the adhesive absorbing material according to formula (3):
Wherein: Nb——Number of layers of adhesive absorbing material:
Prepreg stacking weight, 8;
A——Fiber reinforced plastic flat plate area, cm2or resin matrix density, g/cm3:
of—Fiber density, g/cm3
Gb—Amount of adhesive absorbing material per unit area, g/cm2, and the other symbols Na, Gpf, Vf are the same as formula (2). The calculation results are rounded to integers.
2.3.6 Cut the required amount of adhesive absorbing material according to the above calculation results. The size of the adhesive absorbing material is 400mm×400mm. 2.3.7 Combine the prepreg blank and related auxiliary materials in the following order: a. Place an isolation film on the metal bottom mold
b. Place a layer of perforated demoulding cloth on the upper and lower surfaces of the prepreg blank. Page 7
Manufacturing of unidirectional fiber
Reinforced plastic flat plate
50-1984
c. Place the glue-absorbing material on the isolation film of the bottom template, the number of which is half of its total number of layers. Then place the prepreg with the perforated demoulding cloth on the glue-absorbing material, and then place the other half of the layers of glue-absorbing material. When the total number of glue-absorbing layers is an odd number 2n+1, n+1 layers can be placed on the upper side of the prepreg. At the same time, lay peripheral stop strips around the prepreg stack. d. Place the perforated isolation layer and the perforated metal upper pressure plate in sequence. si
e. Paste the peripheral sealing tape between the upper platen periphery and the bottom template 2.3.8 Place the above assembly on the metal substrate in the autoclave, lay the breathable material, vacuum bag material and sealing strip according to Figure 3 to form a vacuum bag system.
2.3.9 Cure according to the curing system specified in the prepreg material technology 2.3.10 After curing, cool to room temperature with the tank under pressure. Remove the assembly from the autoclave and take out the fiber reinforced plastic flat plate. Cut off 15mm on each side.
《Testing
Unidirectional Fiber Reinforced Plastic Flat Plates》
4550-1984
Page 8
3 Inspection
3.1 Carry out external inspection of the flat plate according to the relevant provisions of GB1556《Fiber Reinforced Plastic Test Methods General Rules》.sinoaec.com
3.2 Measure the length of the four sides, accurate to 0.5mm. 3.3 Measure the thickness at each corner 25mm from the edge and at the center of the plate, accurate to 0.01mm. 3.4 Weigh the plate to an accuracy of 0.1g, round it to a positive integer, and place it on the fiber.
Flat Plate White
4550-1984
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4Test Report
The report should include the following:
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b. Appearance, size, thickness, weight, number of winding layers (referring to winding method), number of prepreg layers (referring to vacuum bag method) and fiber volume content:
c. Fiber type:
d. Glue type and curing system:
f. Other instructions.
4550-1984
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Additional Notes:
This standard was proposed by the State Building Materials Industry Bureau and the Ministry of Aviation Industry of the People's Republic of China, and is under the jurisdiction of the Fiber Reinforced Plastics.sinoaec.com
Standardization Technical Committee.
This standard was jointly drafted by the Harbin Fiberglass Research Institute of the State Building Materials Industry Bureau and the Aviation Materials Research Institute of the Ministry of Aviation Industry.
The main drafters of this material are Wang Bingquan, Yang Yinping, Jiao Xuqi (winding method): Zhang Heshan (vacuum bag-autoclave method). "Try to Enjoy
Unidirectional Fiber Reinforced Plastic Flat White
4550-1984
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