ASTM D6775-02(2007)
(Test Method)Standard Test Method for Breaking Strength and Elongation of Textile Webbing, Tape and Braided Material
Standard Test Method for Breaking Strength and Elongation of Textile Webbing, Tape and Braided Material
SIGNIFICANCE AND USE
This test method can be used for acceptance testing of commercial shipments but comparisons should be made with caution because estimates of between-laboratory precision are incomplete.
5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use samples for such comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing, and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
Elongation is an indication of the ability of a fiber to absorb energy. The elongation of textile materials must be great enough to withstand strains experienced in processing and end use, and to absorb the energies of applied forces repeatedly.
SCOPE
1.1 This test method covers the determination of the breaking strength and elongation of textile webbing, tape and braided materials using a split-drum type specimen clamp.
1.2 This test method is limited to materials with a maximum width of 90 mm (3.5 in.) and a maximum breaking strength of no more than 89000N (20000 lb).
1.3 The values stated in either SI units or U.S. Customary units are to be regarded separately as standard. Within the text, the U.S. Customary units are given in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6775–02 (Reapproved 2007)
Standard Test Method for
Breaking Strength and Elongation of Textile Webbing, Tape
and Braided Material
This standard is issued under the fixed designation D6775; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Test Method
4.1 A specimen is clamped in a tensile testing machine and
1.1 This test method covers the determination of the break-
ing strength and elongation of textile webbing, tape and extended to rupture. The breaking force is determined from a
braided materials using a split-drum type specimen clamp. force-elongation curve or with an interfaced computer. Elon-
1.2 Thistestmethodislimitedtomaterialswithamaximum gation is determined by calculating the difference between
width of 90 mm (3.5 in.) and a maximum breaking strength of bench marks before the application of a force and at a specified
no more than 89000N (20000 lb). force.
1.3 The values stated in either SI units or U.S. Customary
5. Significance and Use
units are to be regarded separately as standard. Within the text,
the U.S. Customary units are given in parentheses. The values 5.1 This test method can be used for acceptance testing of
commercial shipments but comparisons should be made with
stated in each system are not exact equivalents; therefore, each
system shall be used independently of the other. caution because estimates of between-laboratory precision are
incomplete.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.1.1 If there are differences of practical significance be-
tween reported test results for two laboratories (or more),
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- comparative tests should be performed to determine if there is
a statistical bias between them, using competent statistical
bility of regulatory limitations prior to use.
assistance. As a minimum, use samples for such comparative
2. Referenced Documents
teststhatareashomogeneousaspossible,drawnfromthesame
2.1 ASTM Standards: lot of material as the samples that resulted in disparate results
D76 Specification for Tensile Testing Machines for Textiles during initial testing, and randomly assigned in equal numbers
D123 Terminology Relating to Textiles to each laboratory. The test results from the laboratories
D1776 Practice for Conditioning and Testing Textiles involved should be compared using a statistical test for
D4848 Terminology Related to Force, Deformation and unpaired data, at a probability level chosen prior to the testing
Related Properties of Textiles series. If bias is found, either its cause must be found and
D4850 Terminology Relating to Fabrics and Fabric Test corrected, or future test results for that material must be
Methods adjusted in consideration of the known bias.
5.2 Elongation is an indication of the ability of a fiber to
3. Terminology
absorbenergy.Theelongationoftextilematerialsmustbegreat
3.1 For definitions of terms related to force and deformation enough to withstand strains experienced in processing and end
used in this test method, refer to Terminology D4848. For
use, and to absorb the energies of applied forces repeatedly.
definitions of other terms related to textiles used in this
6. Apparatus
standard, refer to Terminology D123, and D4850.
6.1 Tensile Testing Machine, CRE-type, conforming to
Specification D76 with respect to force indication, working
range, capacity and verification of recorded elongation, and
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
designed for operation at a pulling speed of 75 6 25 mm/min
and is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,
Specific.
(3 6 1 in./min).
Current edition approved Jan. 1, 2007. Published January 2007. Originally
6.2 Clamping Assembly, consisting of an upper and lower
´1
approved in 2002. Last previous edition approved in 2002 as D6775 – 02 . DOI:
clamp, each a split-drum type, as shown in Fig. 1 and Fig. 2.
10.1520/D6775-02R07.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Apparatus and clamps are commercially available.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6775–02 (2007)
FIG. 1 Side View of Clamping Assembly
FIG. 2 Example of Clamping Assembly
D6775–02 (2007)
6.3 Computer or Microprocessor, interfaced, with auto- 9. Conditioning
matic data gathering system, including photo or electronic
9.1 Conditionthetestspecimenstomoistureequilibriumfor
instruments to measure elongation. (Optional.)
testing in the standard atmosphere for testing textiles in
accordance with Practice D1776 or, if applicable, in the
7. Sampling, Test Specimens, and Test Units
specified atmosphere in which the testing is to be performed.
7.1 Lot Sample—Take a lot sample as directed in the
9.2 In the event of dispute concerning the results of tests
applicable material specification. In absence of such a specifi-
that may be affected by the moisture content, test specimen(s)
cation randomly select five rolls or pieces to constitute the lot
shall be preconditioned by bringing them to approximate
sample.
moisture equilibrium in the standard atmosphere for precondi-
7.2 Laboratory Sampling Unit, as produced material—As a
tioning textiles in accordance with Practice D1776.
laboratory sampling unit take one piece of full-width webbing,
tape or braid that is at least 1.4 m (1.5 yd) in length from each
10. Procedure
roll or piece in the lot sample.
10.1 Test the relaxed specimens in the standard atmosphere
7.2.1 For thick specimens, longer specimens may be re-
for testing textiles.
quired to maintain the specified gage length and to ensure the
specimen is completely in the clamps.
NOTE 2—Theforcemeasuringsystemshouldbezeroedpriortorunning
any specimens and periodically during the course of the test, particularly
7.2.2 Whentestingafterabrasionisrequired,asalaboratory
if drift is observed in the zero value of the force measuring system.
sampling unit, take one piece of full-width webbing, tape or
braid that is at least 2.8 m (3.0 yd) in length from each roll or
10.2 Insert one end of the specimen centrally and com-
piece in the lot sample (see 7.2.1).
pletely between the two halves of the split drum in the upper
7.3 TestSpecimens,asproducedmaterial—Fromeachlabo-
clamp. From the front of the drum, wrap the specimen down
ratory sampling unit, cut 1 test specimen full-width and at least
and around the back of the lower half of the drum and up
1.4 m (1.5 yd) in length (see 7.2.1).
around the upper half, such that the specimen comes over the
7.3.1 When testing after abrasion is required, from each
upper clamp front.
laboratory sampling unit, cut 2 test specimens full width and at
10.3 Take the opposite end of the specimen and starting at
least 1.4 m (1.5 yd) in length (see 7.2.1). Mark one specimen
the back, loosely wrap around both halves of the lower clamp.
“A” for abraded and the other “U” for unabraded.
Fromthebackofthelowerclamp,lifttheupperhalfofthesplit
7.4 When the lot or shipment consist of less than 5 rolls or
drum and insert the specimen end centrally and completely
pieces, randomly select 5 test specimens for each condition of
between the two halves of the split drum. Remove as much
test, that represent all rolls or pieces in the lot or shipment.
slack from the specimen as possible.
7.5 Ensure specimens are free of folds, creases, or wrinkles.
10.3.1 When elongation is required and a slight tension is
Avoid getting oil, water, grease, etc. on the specimens when
specified in a material specification, apply the tension by
handling.
moving the lower crosshead (pulling mechanism) down until
the specified tension is shown on the recording device.
NOTE 1—An adequate specification or other agreement between the
purchaser and the supplier requires taking into account the variability
10.4 When elongation is required, set the photo or elec-
between shipping units, between packages or ends within a shipping unit,
tronic instruments as directed in the manufacturer’s directions,
and between specimens from a single package to provide a
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