GB/T 5352-1985 Test method for parallel plate external load performance of fiber reinforced thermosetting plastic pipes GB/T5352-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T5352-1985
Test Method for Parallel Plate External Load Performance of Fiber Reinforced Thermosetting Plastic Pipe
National Bureau of Standards
1986-05-01
Page 1
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Test Method for Parallel Plate External Load Performance of Fiber Reinforced Thermosetting Plastic Pipe" Data No.:
5352-1985
1 Definition of Terms
2 Test Specimen
3 Test Conditions and Equipment..||t t||4 Test stepsbzxZ.net
6 Test results
7 Test report
Additional notes:
Page 2
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Test method for external load performance of fiber reinforced thermosetting plastic pipes under parallel loading plates》
Data compilation
5352-1985
This standard is applicable to the determination of the stiffness, stiffness factor, load-deformation curve of the fiber reinforced thermosetting plastic pipe when a radial load is applied to the pipe through two parallel loading plates, as well as the load and deformation when a significant event occurs. sinoaec.com
Performance Test Method》
Fiber-reinforced plastics
Plastic pipes
Thermosetting 1
Plate external load
5352-1985
Material Code→
Page 3
1 Definition of terms
The main terms used in this standard are defined as follows: 1.1 Change in pipe diameter: the change in the inner diameter of the pipe measured along the loading direction. 1.2 Pipe radial deformation rate: the percentage of the change in pipe diameter to the initial inner diameter. 1.3 Line load: the load value applied to the unit length of the pipe to produce a given radial deformation rate of the pipe. 1.4 Average radius: half of the difference between the average outer diameter and the average wall thickness, that is, the center radius of the pipe wall. 1.5 Pipe stiffness: the value obtained by dividing the line load by the corresponding change in pipe diameter. 1.6 Rigidity tooth: the product of pipe stiffness and 0.149r[3]. 1.7 Pipe significant event: refers to cracking or crazing of pipe lining, cracking or delamination of pipe wall, etc. a. Cracks or crazing of lining: visible cracks or network of fine cracks appear on the pipe lining; b. Cracks of pipe wall: visible cracks appear on the pipe wall; c. Delamination of pipe wall: visible delamination appears in the pipe wall. Page 4
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Test Method for External Loading Performance of Parallel Plate of Fiber Reinforced Thermosetting Plastic Pipes》Material Code →
5352-1985
2 Test Specimen
2.1 The minimum length of the test specimen shall be 3 times the nominal diameter of the pipe, or 30 cm, whichever is smaller. For the specimens with a nominal diameter greater than 150 cm, the minimum length shall be 20% of the nominal diameter. The value shall be rounded to an integer 2.2. Each group of specimens shall consist of at least three pieces.
2.3 The ends of the specimens shall be cut vertically, and the cut surfaces shall be free of burrs and jagged edges. 2.4 To prevent uneven load distribution along the length of the specimen, if the contact area between the specimen and the loading plate is uneven, it shall be polished or sandblasted without damaging the reinforcing material. Fiber-reinforced thermosetting plastic pipe parallel to the plate external load performance test method》
Material Code→
5352-1985
Page 5
3 Test conditions and equipment
3.1 The specimens shall be stored in an environment with a temperature of 23±2℃ for at least 4h, and the test shall be carried out in the same environment. 3.2 For the arbitration test, the specimens shall be stored in an environment with a temperature of 23±2℃ and a relative humidity of 50±5% for at least 40h, and the test shall be carried out in the same environment.
3.3 Test equipment is in accordance with Chapter 5 of GB1446-83 "General Principles for Test Methods for Performance of Fiber Reinforced Plastics". 3.4 Loading plate: Two parallel steel plates that apply radial load to the specimen. The plate surface in contact with the specimen should be flat and smooth. The thickness of the plate should not be less than 6mm to ensure sufficient rigidity. The length of the plate should not be less than the length of the specimen, and the width should not be less than the contact width of the specimen with the loading plate when the specimen reaches the maximum radial deformation plus 15mm. 3.5 Loading form is shown in the figure below:
3.6 Loading speed is 10~20mm/min.
3.7 Deformation measuring instrument should be accurate to 0.25mm Page 6
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Fiber Reinforced Thermosetting Plastic Pipe Parallel Plate External Load Performance Test Method" Material Compilation →
5352-1985
4.1 Prepare the specimen in accordance with 2.3 and 2.4.
4 Test steps
4.2 Check the appearance of the sample according to the provisions of GB1446-832.1. 4.3 Adjust the state of the sample according to the provisions of 3.1 or 3.2. 4.4 Number the qualified samples and measure the sample dimensions. The measurement accuracy is 0.02mm except for the length which is 1mm. 4.4.1 Measure the length of the sample at least in four equal intervals along the circle and take the average value. 4.4.2 Measure the wall thickness and lining thickness at at least eight equal intervals on any end face and take the average values ​​respectively. 4.4.3 Determine the average inner diameter of the sample
4.4.3.1 For the outer diameter control tube, measure the outer diameter in two directions perpendicular to each other at three different cross-sections of the sample and take the average value as the average outer diameter. Then subtract twice the average wall thickness to calculate the average inner diameter of the sample. 4.4.3.2 For the inner diameter control tube, measure the inner diameter in two directions perpendicular to each other on each end face of the sample and take the average value. 4.5 Place the sample at the center of the lower loading plate. 4.6 Install the deformation measuring instrument at a suitable position. Apply the initial load so that the upper loading plate contacts the specimen. Check and adjust the deformation measuring system so that the entire system is in normal working condition. This is the starting point for measuring deformation. 4.7 Load the specimen at the loading speed specified in 3.5. 4.8 Continuous measurement or interval measurement can be used to determine the load-deformation curve. The deformation increment of the interval measurement should not be greater than 5% of the average inner diameter of the specimen.
4.9 Pay attention to the first significant event that occurs, and record the type, location, and corresponding load and deformation of the event in a timely manner.
4.10 The test should be interrupted when one of the following situations occurs: a. The deformation increases but the load does not increase.
b. The deformation of the specimen has reached 30% of the average inner diameter or the specified maximum deformation. Page 7
Test method for external load performance of strong thermosetting
plastic pipes parallel
lower plate
5352-1985
5.1 The pipe stiffness is calculated according to formula (1):
5Calculation
Where: PS is the pipe stiffness corresponding to the change in pipe diameter △Y, kPa (kgf/cm[2]): △Y is the change in pipe diameter, mm (cm):
The linear load corresponding to the change in pipe diameter △Y, N/m (kgf/cm). F
5.2 The stiffness factor is calculated according to formula (2):
SF=0.149r[3]·PS
Wherein: SF
Stiffness factor corresponding to the pipe stiffness PS, kPa·mm[3l(cm[3]: kgf/cm[2]); PS——same as formula (1)
（3）
Average radius, mm (cm):
Average outer diameter of the specimen, mm (cm);
d——Average inner diameter of the specimen (for lined pipes, the average inner diameter of the specimen should be plus twice the thickness of the lining), mm (cm);
Average wall thickness of the specimen (for lined pipes, the average wall thickness of the specimen should be minus the thickness of the lining), mm (cm).
5.3 The radial deformation rate of the pipe is calculated according to formula (4): AY
Wherein: P
Radial deformation rate of the pipe, %;
Same as formula (1);
Same as formula (3).
Page 8
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Test method for external load performance of parallel
lower plate of reinforced thermosetting plastic pipe
Data compilation
5352-1985
6 Test results
Give all or part of the following test results for each specimen:.sinoaec.com
6.1 Record the type, location and corresponding load and deformation of the first significant event. 6.2 Indicate the reason for interrupting the test.
6.3 Give the stiffness and stiffness factor of each specimen when the radial deformation rate of the tube is 5% and 10%; when a significant event occurs when the radial deformation rate of the tube is less than 5%, the stiffness and stiffness factor when the significant event occurs should be given. 6.4 Give a load-deformation curve and mark the locations where significant events occur on the curve. Fiber reinforced pump
Strong thermosetting
Plastic pipe parallel to the plate external load
Performance test method》
Material Code→
5352-1985
Page 9
7 Test report
Except the test results are in accordance with Chapter 6, the rest are in accordance with Chapter 7 of GB1446-83 sinoaec.com
Strong thermosetting
Plastic pipe parallel to the plate external load
Performance test method》
5352-1985
Material Code+
Page 10
Additional notes:
This standard is proposed by the State Bureau of Building Materials Industry and is under the jurisdiction of the National Technical Committee for Fiber Reinforced Plastics Standardization. .sinoaec.com
This standard was jointly drafted by the Beijing Glass Fiber Reinforced Plastics Research Institute of the State Building Materials Industry Bureau, the Shanghai Materials Research Institute of the Ministry of Machinery Industry, and the Harbin Institute of Architecture and Civil Engineering of the Ministry of Urban and Rural Construction and Environmental Protection. The main drafters of this standard are Wang Zhenhua, He Xiaoyuan, Zhu Lizhen, Shi Yongyu, Zhao Jinghai, and He Shoujian. This standard is equivalent to the American Society for Testing and Materials standard ASTMD2412-77 "Standard method for determining external load characteristics of plastic pipes by parallel plate loading". However, the scope of application is only fiber-reinforced thermosetting plastic pipes. "Test method for external load performance of fiber-reinforced thermosetting plastic pipes by parallel plate loading" Material Code →
5352-1985
Page 11
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