1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW14775Resistance to Snagging of Textile Materials Copyright 2013 General Motors Company All Rights ReservedNovember 2013 Page 1 of 41 ScopeNote: Nothing in this standard supercedes applicable laws and regulations.Note: In the event of conflict between th
2、e English and domestic language, the English language shall takeprecedence.1.1 Purpose. This standard determines the susceptibility of fabric trim materials to snagging (thread pull out).It attempts to simulate the snagging effects of clothing items such as buttons, zips, etc., on fabric seat trimma
3、terials, particularly those of thick pile construction, which are especially prone to such effects.1.2 Foreword. Not applicable.1.3 Applicability. Fabric trim materials.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specification
4、s.ISO 95132.2 GM Standards/Specifications.GMW32212.3 Additional References.GME Organic Materials/Chemical Laboratories, Integrated SQA Laboratory, (0049 6142 775649)3 Resources3.1 Facilities.3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a validcal
5、ibration label.3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuringvariables as specified in this standard shall be determined correctly with respect to their physical definition.3.2 Equipment.3.2.1 Apparatus for conditioning to the appropriate requi
6、rements as described in GMW3221 Code A, unlessotherwise specified in the relevant material specification.3.2.2 Test Machine. Any test machine capable, with adaptation, of drawing the test fixture, (see Figure 1), in ahorizontal plane across the test piece at a uniform rate of (100 10) mm/minute may
7、be used. (Suitableequipment has been found to be a Tensile Test Machine to ISO 9513, adapted with pulleys and cord.)3.2.3 Cutting dies or shears for preparation of test pieces.3.2.4 Test Fixture. The test fixture shall consist of a sliding carriage equipped with an adjustable metal rivetand of the d
8、imensions shown in Figure 1 and Figure 2.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14775 Copyright 2013 General Motors Company All
9、Rights ReservedNovember 2013 Page 2 of 4Figure 1: Side View of Sliding Carriage (all dimensions are in mm)Figure 2: Front View of Sliding Carriage (all dimensions are in mm)Figure 3: Test Setup Principal612 41.2R3100110612CarriageRivet48CarriageRivetplaneclamp test fixturecordtest piecepulleyarm of
10、tensile test machineCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14775 Copyright 2013 General Motors Company All Rights ReservedNovemb
11、er 2013 Page 3 of 4Figure 4: Test Fixture with Carriage and RivetNote: Additional information for the fabrication of the test fixture and carriage (see Figure 4) may be obtainedfrom the GME Organic Materials/Chemical Laboratories, Integrated SQA Laboratory, (0049 6142 775649).3.3 Test Vehicle/Test P
12、iece. For initial sample and arbitration purposes, at least three test pieces in eachdirection shall be tested and, for routine quality control, at least one test piece in each direction shall be tested.3.3.1 Samples shall be tested in machine direction (MD) (with and against), across machine direct
13、ion (AMD)(both directions), and 45 to machine direction (all four directions). Other angles may be tested dependentupon the design of the test piece. Additional directions to be tested shall be defined on the test requestdocumentation.3.4 Test Time. Not applicable.3.5 Test Required Information. Not
14、applicable.3.6 Personnel/Skills. Not applicable.4 ProcedureThe test piece shall be placed, face side uppermost, on a plane surface and mechanically clamped. The testfixture shall be attached as required (cord, pulleys, etc.) to the test machine, and placed rivet downwards onthe test piece surface.Th
15、e test fixture shall then be drawn across the surface of the test piece at a uniform rate of(100 10) mm/minute.4.1 Preparation. From the available material, test pieces of, 500 mm minimum in length and 500 mm minimumin width shall be cut in warp, MD, (wales) and weft, AMD, (courses) directions.4.2 C
16、onditions.4.2.1 Environmental Conditions. According to GMW3221 Code A.4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suchrequirements shall be specified on component drawings, test certificates, reports, etc.4.3 Instructions.4.3.1 The test piece
17、 shall be placed, face side uppermost, on a plane surface and mechanically clamped. Thetest fixture shall be attached as required (cord, pulleys, etc.) to the test machine, and placed rivet downwardson the test piece surface in specified direction (see Figure 3).4.3.2 The load of the rivet on the te
18、st piece shall be (1 0.1) N.Note: This load is equivalent to a weight of (200 20) g, if the test fixture has the dimensions specified inFigure 1 and Figure 2.4.3.3 The test fixture shall then be drawn across the surface of the test piece at a uniform rate of(100 10) mm/minute.4.3.4 Repeat the test f
19、or all specified directions.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14775 Copyright 2013 General Motors Company All Rights Reserv
20、edNovember 2013 Page 4 of 45 Data5.1 Calculations. Not applicable.5.2 Interpretation of Results. The sample shall be evaluated for snagging; pull out of threads, after testing.Any snagging, pull out of surface threads, found upon close technical inspection (without magnification) shallbe noted.5.3 T
21、est Documentation. Report if any amount of thread pull was noted after testing.6 SafetyThis standard may involve hazardous materials, operations, and equipment. This standard does not propose toaddress all the safety problems associated with its use. It is the responsibility of the user of this stan
22、dard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossary.Resistance to Snagging: Resistance to snagging as determined by this test procedure shall be defined asthe ability of a fabric trim material to resist pu
23、ll out of threads (snagging) when tested in a standard manner.7.2 Acronyms, Abbreviations, and Symbols.AMD Across Machine DirectionMD Machine Direction8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Example:“No thread snagging or pull out when tested i
24、n accordance with GMW14775.”9 Release and RevisionsThis standard was originated in November 2005. It was first approved by Global Textile Committee inJanuary 2008. It was first published in January 2008.Issue Publication Date Description (Organization)1 JAN 2008 Initial publication.2 NOV 2013 5 year refresh updateCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
