This standard specifies the method for determining the tear strength of fabrics. This standard applies to woven fabrics and may also apply to fabrics produced by other technologies. This standard does not apply to woven elastic fabrics, knitted fabrics, fabrics with large warp and weft differences that may cause tear transfer, and sparse fabrics. GB/T 3917.1-1997 Textile fabric tear properties Part 1: Determination of tear strength by impact pendulum method GB/T3917.1-1997 Standard download decompression password: www.bzxz.net

1CS59.080-30
National Standard of the People's Republic of China
GB/T 3917. 1-1997
Textiles
Tear properties of fabrics
Part 1: Determination of tear force
Ballistic pendulum method,
Textiles--Tear properties of fabrics-Part7: Determination of tear force-Ballistic pendulum Method (Elmendorf) Issued on June 9, 1997
State Administration of Technical Supervision of Mongolia
Implementation on December 1, 1997
GH/T3917.1—1997
This standard refers to the draft international standard IS0/DIS139371:1995 <Textile fabric tearing and fat generation Part 1, Determination of magnetic force impact pendulum method (Elmendorf)\, and revised the national standard (B3919-83), and added the preface during compilation. Compared with the original G3919-83, the revised standard has been revised as follows! In addition to woven fabrics, the scope of application has been increased to "suitable for fabrics produced by other technologies", and the scope of non-application has been increased to "woven elastic fabrics, knitted fabrics, and fabrics with large warp direction and debonded fabrics that may produce tearing transfer". 2. The instrument requirements are specified in the specification. 3. Added the adjustment and inspection of the instrument (Appendix A), the sampling force method (Appendix B) and the cutting specimen diagram from the solid acid sample (Appendix C). This standard will replace GB391S-B3 from the date of implementation. The tearing performance of fabrics includes three parts: Part 1: Determination of tear strength by impact method! Part 2: Determination of tear strength of tongue-shaped specimens Part 3: Determination of tear strength of trapezoidal specimens. This standard is proposed by the Science and Technology Development Department of the China Textile Association: This standard is issued by the Standardization Research Institute of the China Textile Association. The drafting unit of this standard is Shanghai Textile Science Research Institute. The main drafters of this standard are: the National Standard of the People's Republic of China
Fabric tearing performance
Textiles
Part 1: Determination of tear strength by impact pendulum method Textles-'Tear Properties of fabrics-I'artl, Determizulion nf tear force-Ballistic pcedulum mechod (Elenendorf) ScopeWww.bzxZ.net
This standard specifies the determination method of fabric tearing strength GI/T 3917.1—1997
This standard is applicable to woven fabrics and can also be applied to fabrics produced by other fabric technologies. This standard is not applicable to woven elastic fabrics, knitted fabrics, and fabrics with high warp and benzene content that may cause tearing and screening fabrics.
2 References
The provisions contained in the following standards are incorporated as provisions of this standard by reference in the standard. At the time of publication of this standard, the versions shown are valid. All standards will be revised. All parties using this standard should discuss the possibility of using the latest versions of the following standards. CB6529-85 Standard atmosphere for humidity conditioning test of textiles GE21787 Numerical formula
3 Definitions
This standard uses the following definitions
3.1 Tear strength Irar [arce
Under specified conditions, the force required to expand the initial cut on the specimen. Note: The tear strength is different from the type of warp yarn or the external yarn, and is also called "light tear" and "tear strength". 32 Tear length aftear
The distance from the start of the tear to the end of the tear. 4 Principle
The specimen is fixed on the clamp and a cut is made on the specimen. When the specimen is in the position of maximum potential energy, the movable clamp leaves the fixed clamp, and the specimen is torn in the direction of the cut. The work done to tear the fabric for a certain length is uniform. 5 Sampling
Sampling shall be carried out according to the technical conditions of the product or the agreement between the parties concerned. If there is no such requirement, the sampling provisions in Appendix B shall be used. The appendix gives an example of shear specimens in laboratory samples. Avoid wrinkles, edges and non-representative areas of the fabric. National Thermal Technology Supervision Bureau 1997-06-09 Approved 199712-01 Postal
6 Instruments
6.1 General
GB/3917.1—1997
Instrument Manufacturing Instructions Regular maintenance and adjustment, a brief description of the maintenance and adjustment of the instrument functions is shown in Appendix A. 6.2 Swing
The test instrument is of the rust type. The specimen is held between two holes, only one can be reached, and the other is fixed on the frame. It falls under the action of gravity and is automatically recovered. During the test, the specimen is torn without contacting the specimen. The following parts of the equipment are composed of a rigid frame equipped with a pendulum, a fixed pendulum, a knife for making a notch and a measuring nut. Before the test, the instrument is horizontal and fixed to prevent any movement. The hammer can be moved around a horizontal axis equipped with a bearing: lift the pendulum to the starting position of the test and release it immediately. The mass of the pendulum can be changed by adding an external mass or replacing the pendulum. It is recommended that the breaking result fall within 15% of the full range of the instrument. Mechanical or electrical equipment: the maximum amplitude of the first swing can be used to fill the sample. The tearing force can be directly obtained. The receiver is equipped with a movable drum on the waist hammer, and the clamp is fixed on the frame. In order to allow the knife to pass, the two clamps must be separated. 3 ± 0.5) m. The holding surfaces of the two clamps are aligned so that the specimen is parallel to the pendulum axis and is in a plane with a vertical alignment of (27.5 ± 0.5)*. The fasteners are parallel to the two fasteners and are halfway between the two fasteners. The distance between the clamps and the fasteners is (1 ± 1 mm). The length of the holding surfaces is not specified. The width is 30-40 mm. The height is preferably 20 mm, but not less than 15 mm. When the pendulum is hanging freely, the two fasteners must be in the same plane and the blade must be perpendicular to the swinging surface of the pendulum. The clamping surface is in a state where the force applied to the clamping surface is sufficient to make the specimen cut without slipping. A sharp knife is used to cut the specimen between the two clamps (20 ± 0.5). 6.3 Equipment for cutting the specimen group || tt || It is best to use a hollow punch or push die, as shown in Figure 1. Single risk ET, T
SC 1
7 Standard atmosphere for temperature adjustment and test
The standard atmosphere for temperature adjustment and test is in accordance with GB6529, and the humidity adjustment test is carried out. The secondary standard atmosphere is used for the acid loading test. 2
8 Preparation of test specimens
8.1 General
CB/T 3917.1-1997
Two groups of test specimens shall be taken for each test sample, one group for warp direction and the other for weft direction. The short side of the test specimen shall be parallel to the warp-weft plane to ensure that the initial cut is made.
For other fabrics, use the relevant indication direction, such as length direction and width direction. Each group shall contain at least five test specimens or more test specimens specified in the contract. The test specimens shall not contain the same length direction as the contract. No sampling shall be allowed within 50 mm from the edge. 8.2 Shape and size
The test specimens shall be obtained according to Figure 1. The shape of the test specimens may be slightly different, but the tear length shall be maintained at (13 ± U.5) mm. 8.3 Sample cutting
For each sample of woven fabric, the tear direction when the short side of the sample is parallel to the fabric is "weft tear", and the tear direction when the short side of the sample is parallel to the warp is "warp tear" (see Appendix C). 9 Test steps
9.1 Overall test
Select the best quality of the test specimen, and the test result of the test specimen shall fall within 15% to 85% of the scale. Correct the zero position of the instrument and raise the instrument to the starting position. 9.2 Install the test specimen
Clamp the specimen in the clamp so that the long side of the specimen is parallel to the top edge of the clamp. Clamp the specimen in the center and gently place its dirty edge to the bottom of the clamp. Cut a cut of (20±0.6) mm on the opposite side with a knife. The remaining tear length is (43±0.5) mm. 9.3 Operation
Press the stop button, and start the test. When the operation is in progress, keep it in place to avoid damaging the pointer. Read the test force from the scale scale of the measuring device in Newtons. Check whether the result falls within the range of 15% to 35% of the scale used. Repeat the test at least 5 times in each direction.
Observe whether the tearing is in the direction of the force, whether the yarn slides from the fabric instead of being torn. If the fabric does not slide from the fabric, and the tear is always in the 15mm wide groove area, the test is normal. Otherwise, the result is eliminated. If three or more of the five samples are eliminated, this method is not used. If the agreement requires additional samples, it is best to double the number of samples. 10 Calculation
Calculate the arithmetic mean of the tearing force in each test direction in Newtons, and round it to 10 decimal places according to G/8170. If necessary, record the maximum and minimum tearing strength of the specimen in each direction. 11: Test reports shall include the following: 11.1 General information 11.1.1 Date of preparation of this standard and test. 11.1.2 Test specimens, if necessary, including the method of sampling. 11.1.3 Applicable measurement range 11.1.4 Number of specimens tested and their origin, 11.1.5 Details of any deviation from this standard. 11.2 Test results 11.2.1 Average values ​​of longitudinal and longitudinal tearing strengths in Newtons (N). If only three or four specimens are positively broken, write down the results of each test on the other specimens.
GB/T3917.1--199?
11.2.2 If necessary, use percentage [%) to express the variation value of tear strength. 11.2.3 If necessary, use Newton (V) to express the 95% multiple interval of tear strength. 11.2.4 If necessary, use Newton (N>) to calculate the minimum and maximum tear tension of the sample in each direction. CB/3917.1-1997
Appendix A
(Standard Appendix)
Adjustment and quick test of instrument
If necessary, refer to Chapter 6 and the instrument manufacturer's manual to discuss the functional part of the instrument. It is recommended to make the following tests before the test: check the parallelism of the clamp when the grip is freely suspended, and check the small gap between the two coins. The distance between the center of the clamp and the gap is (3 ± 0.5) l. Check the rust of the knife. The sharpness of the knife has an adverse effect on the test results. The tear length of the sample can be checked with a paper sample. The sample is cut with a small (20 ± 0.5) mm. The installation height of the knife is just so that the sample has a tear length of (43 ± 5) mm. The level of the instrument is very important. When the hammer is moving, the movement of the instrument is the main source of error. It is better to maintain the instrument and obtain the dynamic process. There is no obvious movement of the instrument. Use the built-in leveling bubble to adjust the instrument level. Calibrate the instrument several times without placing the sample. Close the movable needle, check the friction of the bearing, and adjust the zero pointer positioning value to the value displayed on the meter. When the test is repeated three times in a row, the position is within the scale ±1 tolerance range. At this time, the instrument is considered to be adjusted. Appendix B
(Appendix with difficulty)
Suggested sampling steps
B Batch samples (the number of pieces taken from a shipment or a batch) from the second Randomly take batch samples from a load or a batch according to Table B1 to ensure that the samples are not damaged during transportation. Take batch samples at random according to Table B1 to ensure that the samples are not damaged during transportation. Take the least number of pieces from a load or a batch at a time. B2. Quantity of laboratory samples. From each piece of the batch sample, randomly cut a whole piece of laboratory sample of not less than 1/4 length from the end to the center of the piece to ensure that there are no wrinkles or visible spots on the samples.
GB/T 3917.1-1997
(Appendix according to the specification)
List of test samples for cutting from experimental samples
List of test samples for cutting from practical dangerous goods See Figure 1
1) "End net\South crack test sample
2) *Epidemic sample
Medical C1 laboratory sample sample
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