This standard specifies the method for determining the breaking strength of fabrics by the grab method, including tests in which the specimen is either in equilibrium or wet in the standard test atmosphere. This standard applies to woven fabrics, as well as knitted fabrics, coated fabrics and other textile fabrics. This standard does not apply to elastic fabrics, geotextiles, glass fiber woven fabrics, carbon fiber fabrics and polyolefin braids. This standard specifies the use of a constant rate of elongation (CRE) tester. GB/T 3923.2-1998 Tensile properties of textile fabrics Part 2: Determination of breaking strength by grab method GB/T3923.2-1998 Standard download decompression password: www.bzxz.net

ICS 59. 080. 30
National Standard of the People's Republic of China
CB/T3923.2—1998
Textiles
Tensile properties of fabrics
Part 2: Determination of breaking force-Grab method
Textiles---Tensile properties of fahrics--Part 2,Determination of breaking force-Grah mcthod1998-11-26 Issued
1999-05-01 Implementation
State Administration of Quality and Technical Supervision Issued
GB/T3923.2—1998
This standard is a revision of the national standard GB11030—1988 determination of woven breaking force according to the draft international standard S0/S13934.2—19944, the second new method for the determination of the breaking force of small-scale products. Compared with GB/T11050—1989, the following aspects have been revised: 1. Title and applicable scope: The title is based on the title of the draft international standard S0/S13934.2, and the scope of application is expanded to apply not only to woven fabrics, but also to fabrics produced by other technologies. 2. The instrument is specified to use a type of instrument, namely the central tensile tester. 3. The stretching speed adopts constant speed stretching, regardless of the type of fabric, and the stretching speed is 5DTrm/min. 4. Gauge length: 100mtl.
Product, specimen, no pre-strength, standard tensile properties include two parts: Part 1, Determination of breaking strength and breaking elongation by strip method Part 2: Determination of breaking strength by fixed-frequency sampling method. This standard will take effect from the date when it replaces (T/T11050--189) in this standard. Part A, Part B and Part C are the designated parts. This standard is issued by the Science and Technology Development Department of China Textile Industry Association. This standard is under the jurisdiction of the Basic Standards Sub-Technical Committee of the National Textile Industry Technical Committee. The drafting units of this standard are the National Cotton Textile Product Quality Supervision and Inspection Center and the China Textile Industry Association Standardization Institute. The main drafters of this standard are Tu, Hong Yan and Zheng Yuying. 1 Scope
National Standard of the People's Republic of China
Textile fabric properties
Part 2: Determination of breaking strength by strip method Textileg--Telsile properties of fabrics-Part 2: Determlnalion or breaking force.--Grab sample method melhndCB/T 3923. 2- 1998
代/115199
This standard is used to determine the breaking strength of fabrics by mixing method, including the test of the specimen in the test standard atmosphere. This standard is applicable to woven fabrics, and also to knitted fabrics, coated fabrics and other textile fabrics. This standard is not applicable to elastic fabrics, geotextiles, drum shear fiber woven fabrics, carbon fiber fabrics, olefin end webbing, etc. This standard adopts the constant rate of elongation (CRE) tester, and the reference standard is used. |tt||The provisions contained in the following standards constitute the provisions of this standard through their use in this standard. When this standard was published, the version shown was effective. All standard parts will be revised. Parties applying this standard should consider the possibility of applying the latest version of the following standards. GB55-1986 Standard atmosphere for conditioning and testing fabrics GB/T8;79-1987 Rules for revision of standards
3 Definitions
This standard adopts the following definitions:
3.1 Grab test chamber Rr=b rest
A composite test chamber in which the central part of the specimen is held by a clamp, 3.2 Gage length gauge length
The distance between the effective center of the test specimen held by the test instrument. 3.3 Breaking strength
The breaking strength is the force required to break the specimen in a tensile test carried out under specified conditions. 4 Principle
The center of the specimen is clamped in a pair of sharp pliers of a specified size, and the specimen is stretched at a specified pulling speed until it breaks, and its breaking strength is measured. 5 Sampling
The sampling of fabric products is based on the relevant provisions of the relevant service parties. In the case of the above provisions, it is recommended to use the detailed provisions provided in Appendix A. Approved by the State Quality and Technical Supervision Commission on November 26, 1999 and implemented on May 1, 1999. 6 Instruments and Apparatus 6.1 Rapid Elongation Test (CRF Test) GA/T3923.2-199B 6-1.1 The tensile tester shall meet the following requirements: The tensile tester shall have a device to display or record the maximum force applied to the specimen to stretch it until it breaks. At any point in the full range of the tester, the reading error of the displayed or recorded breaking force shall not exceed ±2%. The inclination is 50mm/min and the distance is 5mm/min. The distance length is ±m. 6.1.2 The centers of the two needles of the optical support shall be on the tension line and the center of the tension line shall be in the same plane as the tension line. The clamps should be able to hold the specimen without slipping and without damaging the specimen. If the specimen slips, appropriate cushioning materials can be used. The size of the specimen area to be held for the test should be (2mm + 1mm) × (25mm + 1m). The following methods can be used to achieve this size (see Appendix)
a) One of the central pieces is 25mm wide and at least 40mm long. The length of the clamp is parallel to the tension line. The other central piece is parallel to the length of the other piece with the same size as the tension line: a) One of the central pieces is 25mm wide and at least 40m long. The length of the clamp is perpendicular to the tension line: the size of the other clamp is 20×25m
6.2 Instruments for cutting specimens. bzxz.net
6.3 If a wetting test is required, instruments for dripping specimens, water or non-ionized lubricants should be prepared. 1. Pre-conditioning, conditioning and testing are carried out in accordance with GB652. Standard atmosphere is used for the test. 2. Pre-conditioning and conditioning are not required for the following tests: 8. Samples
Two groups of samples are taken from each product, one group is the warp or longitudinal sample, and the other group is the linear or transverse sample. The sample group includes at least 5 pieces. If there are more requirements, the number of samples should be increased. The samples should have representative characteristics. The wrinkles and points of the fabric should be avoided. The test should be at least 0 meters away from the edge of the fabric to ensure that the samples are evenly distributed on the sample. The record is an example of cutting samples from laboratory samples.
Each sample has a width of 10mm ± 2mm and a length of at least 150m. On each test piece, a line is drawn halfway along the length of the line at 37.5mm from the line. 8.3. Mixed test bar
Product-3.1 The depth of the fabric needs to be measured , the length of the cut specimen is twice the dry resistance test (see Appendix), and after marking numbers on both ends of each specimen, cut into pieces along the strip, one piece is used to measure the dry strength, and the other piece is used to measure the wet strength by hand. The length of the specimen for measuring the differential force is longer than the specimen for measuring the working force: 8.3.2 The wet test specimen shall be placed in a 20℃-2℃ natural water solution containing 18% non-ionic wetting agent for more than 1 liter.
9 Steps and
9.1 The gauge length is set to 100mm. If other two methods are adopted by agreement between the parties concerned, it should be stated in the test report. 9.2 The pull rate is set to 50m1/m.
9.3 Holding specimen
GB/T 3923.2:1998
Hold the middle part of the sample. Ensure that the longitudinal center line of the sample passes through the center line of the pin and is perpendicular to the end of the light tree. Align the mark on the test row with the edge of the clamp (see Figure 1) and close the clamp. Lower the weight of the object and close the F clamp. 10mur
Figure 1 Specimen clamp schematic
Start the pull tester, stretch the sample until it breaks, and record the breaking force (unit N). If the test sample breaks within 5mm from the pin, it is considered a misaligned fracture. When the test of 5 samples is completed, the difference jaw breaking load value is greater than The smallest "normal" breaking value can be retained; if the small value is smaller than the "normal" breaking value, it shall be discarded and additional tests shall be conducted to obtain 5 "normal" breaking values. If all test results are jaw breaking numbers, or if 5 "normal" breaking values ​​cannot be obtained, a single value shall be reported. The jaw breaking result shall be noted in the report.
9.5 Wet test
Take the sample out of the filter towel, place it on water-absorbing paper to absorb the excess moisture, and then immediately proceed to 9.1 to 9.4 for testing. 10 Calculation of cracking force
10.1 Calculate the average cracking force in the longitude and latitude directions or in the longitudinal and transverse directions respectively.Expressed in N, rounded to the nearest integer according to G3/T8170, 10.2 is used to calculate the coefficient of variation of breaking strength and rounded to the nearest 0.1. 10.3 Calculate the compensation range according to formula (1): (a) standard deviation (±4%), and approximate to the desired value. Ans.h
In the formula; S--standard deviation
-test number:
t-obtained from t-distribution, when S=5, the inverse interval is 95%, t*2.776, 11 Test report
The test report should include the following contents:
a) shrinkage and test date of this standard:
b) product name and specification:
c) gauge length and tensile speed;
small) test conditions, i.e. humidification or wetting; e) number of specimens, reasons for discarding data:
mean value of breaking strength, coefficient of variation of breaking strength,
5% confidence interval of breaking strength:
h) any plastic section that is difficult to separate from this standard.
1 Sample (number of pieces selected from a batch)
GB/ 3923.2—1998
Appendix A
(Suggestive Appendix)
Special sampling procedure
Randomly select a corresponding number of pieces from a batch. Fabrics that have been damaged or twisted during transportation cannot be used as samples. A1 Batch sample
Number of pieces in a section
A2 Number of experimental samples
Minimum number of batch samples
Randomly cut a full width of at least 1m from each piece of the batch sample as the actual whole sample, but at least 2m away from the end of the piece. Ensure that the sample has no wrinkles and obvious joints.
Appendix date
[Suggestive Appendix]
Indicative reduction of the film
GE/T3923.2—1998
With love
(Suggestive Appendix)
Example of cutting specimens from experimental straight samples for acid-state secondary whole
Specimen secondary note
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