GB/T 2578-1989 Preparation method of fiber-wound reinforced plastic ring test specimens

This standard specifies the manufacturing method and process conditions of fiber-wound reinforced plastic ring specimens. This method is suitable for making fiber-wound reinforced plastic ring specimens for testing their mechanical properties. GB/T 2578-1989 Method for making fiber-wound reinforced plastic ring specimens GB/T2578-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T2578-1989
Implementation of the method for making annular test specimens of fiber-wound reinforced plastics
1996-08-01
State Administration of Building Materials Industry
Page 1
sinoaec.com
"Method for making annular test specimens of fiber-wound reinforced plastics" Data No.:
2578-1989
1 Main Title and scope of application
2 Reference standards
3 Method summary
4 Equipment
5 Storage and handling conditions of raw materials
6 Wet winding process
7 Prepreg winding process
8 Type of test specimen
Additional instructions:
Page 2
"Method for making ring test specimens of fiber-wound reinforced plastics" Material number:
2578-1989||tt ||1 Subject content and scope of application
This standard specifies the manufacturing method and process conditions of fiber-wound reinforced plastic ring specimens. This method is applicable to the preparation of fiber-wound reinforced plastic ring specimens for testing their mechanical properties inoaec.com
Making method of fiber-wound reinforced plastic ring specimens
2578-1989www.bzxz.net
Page 3
2 Reference standards||t GB1458 Tensile test method for fiber-wound reinforced plastic ring specimen GB1461 Shear test method for fiber-wound reinforced plastic ring specimen
sinoaec.com
Making method for fiber-wound reinforced plastic ring specimen
2578-1989
Page 4
3 Summary of methods
3.1 The specimens are made by single ring winding method or cylinder cutting ring method. These two methods can be made by wet winding or pre-preg winding. The two winding processes are shown in Figures 1 and 2 (Figure omitted). When comparing performance, the same method should be used.
3.2 Single-ring winding method According to the sample size specified in GB1458 or GB1461, a single-ring mold is used to wind on the winding machine, and then solidified, the outer surface is processed, and the demoulding is performed to obtain a ring sample. 3.3 Cylinder cutting ring method According to the inner diameter size of the sample specified in GB1458 or GB1461, a cylinder core mold is used to wind it on the winding machine into a cylinder, and then solidified, the outer surface is processed, demoulding, and cutting are performed to obtain a ring sample. Fiber winding reinforced plastic ring sample production method "Fiber
2578-1989
Page 5
4 Equipment
4.1 The winding machine consists of a yarn frame, a glue groove, a tension control device, a wire nozzle and a driving mechanism. 4.2 Single-ring mold See Figure 3 (Figure omitted). Appropriate connecting shafts should be left at both ends of the core mold of the cylindrical cutting ring to facilitate the assembly of the mold to the inoaec.com
winding machine.
4.3 The demoulding machine can use a suitable press.
4.4 The curing device should have an appropriate controllable temperature range with a deviation range of ±2°C.
2578-1989
Page 6
5 Storage and handling conditions of raw materials
5.1 Raw materials such as fibers, resins and curing agents should be inspected and stored according to technical requirements. 5.2 The fibers must be dried before winding. Glass fibers are dried in an oven at 30 ±2°C for 8 hours. Under the condition that the surface treatment agent does not affect the surface of the fiber, it can be dried at 105 ±2°C for 2 hours. When preparing the ring, the relative humidity of the fiber placement environment is not more than 65%. Carbon fiber and aramid are placed in an oven at (105 ±2)°C to (120 ±2)°C for at least 2 hours. Place the dried fiber in an oven that can maintain a temperature of 70-80℃. The fiber taken out of the oven should be immediately dipped in glue. Fiber winding reinforced plastic ring test specimen production method》Fiber
2578-1989
Page 7
6.1 Mould preparation
6 Wet winding process
Apply a release agent to the cleaned mould or core mould. 6.2 Yarn ball installation
The yarn ball can be placed upright or horizontally on the yarn rack. When the fiber is pulled out of the yarn ball, the twist should be kept constant and a slight tension should be applied to prevent it from shaking.
6.3 Dipping
The fiber is drawn out from the yarn ball, passes through the guide roller, and enters the glue tank equipped with a heating device. When the yarn is pulled out from the glue tank, the excess glue is removed by a device such as a glue squeeze roller or a scraper while minimizing the wear of the fiber. 6.4 Tension control
The impregnated fibers are passed through a series of guide rollers to apply the required tension to the rubber yarn. The winding tension is: 5% to 8% of the fiber breaking strength of glass fiber; 3% to 4% of the fiber breaking strength of aramid fiber; carbon fiber is applied according to the process requirements (it is advisable not to damage the fiber).
6.5 Yarn arrangement
The yarn arrangement should be uniform, and no accumulation, high seams, etc. are allowed. To ensure uniform fiber impregnation and stable tension, the winding speed should be guaranteed to be no higher than 60r/min (the linear speed is 28m/min). 6.6 Curing
After the annular specimen is wound, it is cured according to the prescribed curing system. The storage time of the annular specimens wound in the same batch before curing shall not exceed 8h.
6.7 Processing and demoulding
After the single-ring specimen is cured, first remove the outer molds on both sides, string them together and use grinding or fine turning for surface processing. After processing, remove the middle mold with a press.
The solidified cylinder is first ground or fine-turned, and then the ring is cut and demoulded. Page 8
Method for preparing ring specimens of raw materials》
2578-1989
7 Prepreg winding process
The procedure for preparing specimens by prepreg method is basically the same as that of wet winding process, but the preheating temperature of the mold and the baking conditions of the prepreg tape, winding tension, winding speed, etc., need to be determined according to the technical conditions specified by the prepreg tape. www
inoaec.com
Making ring specimens of raw materials
《Fiber Complete
Strong Plastic Rice
Making Square Fall
2578-1989
Page 9
8 Types of specimens
There are two types of ring specimens, I and I (see Figure 4 and the table below) (Figure omitted). Type I specimens are used for the test method of GB1458. Type II specimens are used for the test method of GB1461. Dimensions
Inner diameter D
Width b
Thickness t
Page 10
sinoaec.com
Rewinding reinforced plastic ring specimen production method
Material code +
2578-1989
The report should include the following:
a. Indicate that the specimen is made according to this standard:
inoaec.com
b. Type, source, resin system, fiber and amount of raw materials; c. Ambient temperature and relative humidity when the ring specimen is made; d. Tension data:
e. Winding speed;
f. Type of specimen to be made;
g. Mold material;
h. Curing system;
Material ring specimen repair
i. Manufacturing date.
2578-1989
Page 11
Additional Notes:
This standard is proposed and managed by the National Technical Committee for Standardization of Fiber Reinforced Plastics. This standard is drafted by the Harbin Glass Fiber Reinforced Plastics Research Institute of the State Building Materials Industry Bureau inoaec.com
The main drafter of this standard is Lin Guorong.
Material Ring Specimen Repair
Strong Plastic Rice
Production Method
2578-1989
Page 12
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.