ASTM D7506 D7506M-2017 red 7500 Standard Test Method for Pocket Reinforcement《袋角衬的标准试验方法》.pdf

1、Designation: D7506/D7506M 12D7506/D7506M 17Standard Test Method forPocket Reinforcement1This standard is issued under the fixed designation D7506/D7506M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A

2、number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method utilizes the grab procedures to determine localized weakness due to bar-tacking in the pocket areas of alltypes of gar

3、ments. This can be utilized to test bar-tacking in the pockets of shirts, as well as side or back pockets of trousers, pants,or jeans.1.2 This test method provides the values in both inch-pound and SI units. Inch-pound units is the technically correct name forthe customary units used in the United S

4、tates. SI units is the technially correct name for the system of metric units know as theInternational System of Units. The values stated in either SI acceptable metric units or inch-pound units are to in other units shallbe regarded separately as standard.The values stated in each system may not be

5、 exact equivalents; therefore, each system shallmustbe used independently of the other. Combining values from the two systems may result in non-conformance with thestandard.other, without combining in any way.1.3 This standard does not purport to address all of the safety concerns, if any, associate

6、d with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on st

7、andardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machine

8、s for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD5034 Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test)3. Terminology3.1 Definitions3.1.1 constant-rate-of-extension tensile testing machine (CRE), na testing machine

9、in which the rate of increase of specimenlength is uniform with time.3.1.2 grab test, nin fabric testing, a tensile test in which the central part of the width of the specimen is gripped in the clamps.3.1.3 tensile test, nin textiles, a test in which a textile material is stretched in one direction

10、to determine the load elongationcharacteristics, in the breaking load, or the breaking elongation.3.1.4 For definitions of other terms used in this test method, refer to Terminology D123.4. Summary of Test Method4.1 Aspecimen of the pocket area with the bar-tacking is mounted centrally in clamps of

11、the tensile strength machine and a forceis applied until the specimen breaks.1 This test method is under the jurisdiction of ASTM Committee D13 on Textiles and is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current edition approved April 1, 2012July 15, 2017. Published May 2012

12、August 2017. Originally approved in 2009. Last previous edition approved in 20092012 asD7506/D7506M-09.-12. DOI: 10.1520/D7506_D7506M-12.10.1520/D7506_D7506M-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of

13、 ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technicall

14、y possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7

15、00, West Conshohocken, PA 19428-2959. United States15. Apparatus5.1 Constant-rate-of-extension (CRE) tensile testing machine, as used in Test Method D5034, conforming to Specification D76.5.2 Clamps and jaws, rubber faced or other gripping surfacejaw faces must measure 1.0 6 0.02 in. (25 6 1 mm)25 6

16、 1 mm(1.0 6 0.02 in.) wide at least 1 in. (25 mm),25 mm (1.0 in.), perpendicular to the direction of the force, and not less than 25 normore than 50 mm (1.0 nor more than 2.0 in.). The back, or bottom, jaw face of each clamp shall be at least as large as its mate.Use of a larger face for the second

17、jaw reduces the problem of front and back jaw face misalignment.6. Safety PrecuationsPrecautions6.1 It is the users responsibility to use safe and proper techniques when handling or using any of the equipment mentioned.6.2 Good laboratory practice should be followed. Wear safety glasses in all labor

18、atory test rooms.7. Sampling, Test Specimens, and Test Units7.1 Cut the garment or the side pockets as shown in Figs. 1-4. If multiple samples are available, cut, if possible, a minimumof 3 specimens. If not, test an agreed upon number of samples.8. Preparation of Apparatus8.1 Tensile Testing Machin

19、e:8.1.1 Prepare the machine according to the manufacturers instructions.8.1.2 Set the distance between the clamps at 3.0 6 0.02 in. (75 6 1 mm)75 6 1 mm (3.0 6 0.02 in.) at the crosshead speedset at 12 in./min (305 mm/min).305 mm/min (12 in./min).8.1.3 Select the force range of the testing machine f

20、or the break to occur between 10% and 90% of the full- scale force.Calibrate or verify the testing machine for this range.8.2 Clamping System:8.2.1 Check the jaw face surfaces for flatness and parallelism.8.2.2 Make a four-ply sandwich or white tissue paper, two soft carbon papers placed back to bac

21、k, and a second white paper(or fold the paper over the two carbons).8.2.3 Mount the papercarbon sandwich and examine the jaw face imprint of uniformity of the carbon deposition on the tissuepaper.8.2.4 If the imprint is incomplete or offsize, make appropriate adjustments of the clamping gripping sys

22、tem and recheck theclamping system with a paper and carbon sandwich.NOTE 1Some sources of clamping irregularities are surface contact, metal surface, or jaw coating over surface, condition and pressure application.8.3 Verification of the Total Operating System:8.3.1 Verify the total operating system

23、 (loading, extension, clamping, and recording or data collection) by testing specimens ofstandard fabrics for breaking force and compare to the data with that given for the standard fabric. Prepare, test and compare thedata given from the tested fabric to the given data known for the standard test.9

24、. Conditioning9.1 Condition garments for a minimum of 4 h prior to testing at 70 6 2F and 65% 6 2 RH. As outlined in Practice D1776.Equilibrium is considered to have been reached when the mass of the specimen in successive weighing made at intervals of notless than 2 h does not exceed 0.1% of the ma

25、ss of the specimen.FIG. 1 Cutting: Patch PocketD7506/D7506M 17210. Procedure10.1 Patch pocket:10.1.1 Mount the area to be tested as shown in Fig. 5 and Fig. 6. The bar-tack area should be midway between top and bottomclamps and centered vertically. The bar-tack must also be perpendicular to the dire

26、ction of force applied.10.1.2 Activate the cross-head and record the ultimate breaking strength.10.2 Side pocket:10.2.1 Mount the area to be tested as shown in Fig. 7 and Fig. 8. The bar-tack area should be midway between top and bottomclamps and centered vertically. The bar-tack must also be perpen

27、dicular to the direction of force applied.11. Report11.1 Report tensile results of the area tested.11.2 Report the mode of failure; for example, seam failure or fabric failure or sewing thread failure.FIG. 2 Cutting: Patch PocketFIG. 3 Cutting: Side PocketFIG. 4 Cutting: Side PocketD7506/D7506M 1731

28、1.3 Report where the break occurs; at the jaw (jaw break) or at the pocket seam.12. Keywords12.1 breaking strength; pocket reinforcement; tensile strengthFIG. 5 Mounting: Patch PocketFIG. 6 Pocket Stress Pulling Strength Patch PocketFIG. 7 Mounting: Side PocketD7506/D7506M 174ASTM International take

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31、d to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the

32、address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phon

33、e), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 8 Pocket Stress Pulling Strength Side PocketD7506/D7506M 175