GB 3362-1982 Test method for tensile properties of carbon fiber multifilament

GB 3362-1982 Test method for tensile properties of carbon fiber multifilament GB3362-1982 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T3362-1982
Test Method for Tensile Properties of Carbon Fiber Multifilament
1983—10—01
National Bureau of Standards
Page 1
.sinoaec.com
Test Method for Tensile Properties of Carbon Fiber Multifilament
3362-1982
2Test Equipment
3Test Conditions..
4 Test steps
5 Test results and calculations,
6 Test report
Appendix A (reference)
Appendix B Manual impregnation method for carbon fiber multifilament (reference) Appendix C Method for determination of cross-sectional area of ​​multifilament (reference) 4
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《Test method for tensile properties of carbon fiber multifilament》
This method is applicable to the determination of tensile strength, tensile elastic modulus and elongation at break of carbon fiber multifilament after impregnation. 国
sinoaec.cor
Fiber multifilament
Elongation
Page 3
1.1 Sample shape and size
1 Sample
The shape and size of the sample used to determine the tensile properties of carbon fiber multifilament are shown in Figure 1. 1.2 Sample preparation
1.2.1 The sample is made of carbon fiber multifilament impregnated with epoxy resin glue. For reference, see Appendix A for the glue formula. 1.2.2 Carbon fiber multifilaments should be placed under the conditions specified in 3.1 for at least 24 hours before being dipped in glue. 1.2.3 Fiber multifilaments can be dipped in glue by hand or machine. For the manual dipping method, refer to Appendix B. 1.2.4 The specimens are glued at both ends with 0.2-0.4 mm thick paper sheets according to the dimensions required by Figure 1 (Figure omitted). Any room temperature curing adhesive can be used.
1.3 Appearance and glue content of specimens
1.3.1 The specimens should be dipped in glue evenly, smooth, straight and free of defects. 1.3.2 The glue content of the specimens made of multifilaments dipped in glue should be controlled within the range of 35% to 50%. Page 4
Test Method for Tensile Properties of Fiber Multifilaments》
3362-1982
2 Test Equipment
2.1 Use a non-inertia tensile machine. The relative error of the load shall not exceed ±1%. Equipped with a device for automatically recording the load-deformation curve. The paper feed speed error of the recorder device shall not exceed 1%. M
sinoaec.cor
Fiber composite
Page 5
3 Test conditions
3.1 Standard test environment conditions, temperature is 23±2℃, relative air humidity is 50±5%. 3.2 When the test is carried out under other conditions, the test environment temperature and relative air humidity shall be indicated in the test report. M
sinoaec.cor
Fiber composite
Page 6
4 Test steps
4.1 Check the appearance of the sample. Measure the sample gauge length, accurate to 0.5mm. First gear speed.
4.2 Adjust the moving speed of the testing machine head, which can be selected within the range of 1 to 20 mm/min.
4.3 Adjust the paper feeding speed of the recorder to make it not less than 40 times the moving speed of the clamp sinoaec.cor
4.4 Clamp the sample, and require the loading axis of the multifilament and the upper and lower clamps to coincide. 《Carbon
Fiber Composites
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5.1 Number of samples
5 Test results and calculations
10 samples are measured for each test. If the sample breaks at the clamp, the test result of the sample is invalid. There should be no less than 6 valid samples for each test. If there are less than 6 valid samples, the test should be repeated. 5.2 Calculation of tensile strength, tensile elastic modulus and elongation at break 5.2.1 Calculate the tensile strength, apparent tensile elastic modulus and elongation at break from the load-deformation curve. P
Where: ot——tensile strength, kgf/cm[2](MPa); p
—breaking load, kgf(N);
A—cross-sectional area of ​​multifilament, mm[2](m[2]). Note: For the method of determining the cross-sectional area of ​​multifilament, see Appendix C. 5.2.1.2 The apparent tensile elastic modulus Ea is calculated according to formula (2): AP
Where: Ea-
apparent tensile elastic modulus, kgf/mm[2](MPa); △P-load value intercepted from the initial straight line segment of the load-deformation curve, kgf(N); - gauge length of the specimen, mm;
△i-deformation increment corresponding to △P within the gauge length, mm. 5.2.1.3 Elongation at break (%) is calculated according to formula (3): AL
Where:
- elongation at break, %;
- apparent elongation at break, mm (see Figure 2) (Figure omitted). AL
· (1)
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Test Method for Tensile Properties of Multifilament Fibers》
5.2.2 Calculate the tensile modulus Et from the apparent tensile modulus Ea according to Appendix D "Corrected Calculation Method for Tensile Modulus".
5.3 Calculation of Arithmetic Mean, Standard Error and Coefficient of Dispersion The arithmetic mean, standard error and coefficient of dispersion of the test results of each group of specimens shall be calculated as required. 5.3.1 The arithmetic mean X of the test results of each group of specimens shall be calculated according to formula (4) and rounded to three significant figures. n
Where: xi is the value measured by a single valid sample; n-
is the number of valid samples
5.3.2 The standard error S of each group of samples is calculated according to formula (5) and rounded to two significant figures. n
(Xi-x)[2]
5.3.3 The coefficient of dispersion CV (%) of each group of samples is calculated according to formula (6) and rounded to two significant figures. s
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Test Method for Tensile Properties of Fiber Multifilaments》
5 Test Report
The test report should include the following contents:
a. Name of fiber manufacturer;
b. Fiber type and brand:
sinoaec.cor
c. Test method standard:
d. Adhesive for impregnating multifilaments, impregnation method and adhesive content;
e. Testing machine model and chuck moving speed
f. Test environment conditions;
g. Test results, including the arithmetic mean, standard error and dispersion coefficient of each group of samples. h. Test personnel, test date and other matters that need to be explained. 《Carbon
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Appendix A (reference)
One of the following formulas is recommended for impregnating carbon fiber multifilament adhesive: A.1648 phenolic epoxy resin, add 0.3g of boron trifluoride-monoethylamine curing agent for every 10g, and use acetone as solvent. After drying, cure at 170±2℃ for not less than 30min. inoaec.cor
A.26101 epoxy resin, add 1g of triethylenetetramine curing agent for every 10g, and use acetone as solvent. After drying, cure at 120±2℃ for not less than 30min.
A.3618 epoxy resin, add 1g of triethylenetetramine curing agent for every 10g, and use acetone as solvent. After drying, cure at 120±2℃ for not less than 30min.
（Test Method for Elongation Performance》
Fiber Multifilament Drawing
3362-1982
Page 11
Appendix B Manual Dipping Method for Carbon Fiber Multifilament (Reference) Country
B.1 Cut a multifilament of about 500mm in length, hold both ends by hand and make it move back and forth once at a uniform speed in the dipping tank. B.2 Put the dipped multifilament on the frame, add a certain tension to make the multifilament horizontally straightened and stretched on the frame, and then put the inoaec.cor
frame in the oven for curing. After curing, take out the frame from the oven and cut the multifilament according to the size in Figure 1. Test Method for Elongation Performance》
Fiber Multifilament Drawing
3362-1982
Page 12
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