1、WORLDWIDEENGINEERINGSTANDARDSTest Procedure GMW16953Fabric Abrasion Test for Body Weatherstrips Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 1 of 81 ScopeNote: Nothing in this standard supercedes applicable laws and regulations.Note: In the event of conflict between the En
2、glish and domestic language, the English language shall takeprecedence.1.1 Purpose. This standard describes the procedure to test and evaluate the resistance to wear/scuff of acoated weatherstrip.1.2 Foreword. Not applicable.1.3 Applicability. This standard is applicable to body weatherstrips.2 Refe
3、rencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.ISO 12947-12.2 GM Standards/Specifications.GMW141253 Resources3.1 Facilities.3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall ha
4、ve a validcalibration 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 Wear Test Machine/Fixture. Wear test m
5、achine capable of 50 cycles/minute to 60 cycles/minute (seeNote), stroke length 80 mm to 100 mm, and cycle counting device (e.g., APG1000 with various test headssupplied by Maag Flockmaschinen GmbH or equivalent equipment to GMW14125 with suitable fixtures). SeeFigure A1, Appendix A.Note: A cycle is
6、 defined as one forward and one backward stroke. Test speed of 50 cycles/minute identifiesthe speed, where the 50 forward movements and 50 backward movements (in total 100 strokes) occur within1 minute.3.2.2 Test Fabric. Martindale Wool Abradant Fabric to ISO 12947-1 shall be obtained from Schsische
7、s TextilForschungs Institut e.V., D-09125 Chemnitz, designation MD100, (www.stfi.de/dienstleistungen/bestellung-von-hilfsmitteln-und-geraeten.html). Length and width of fabric shall be 500 mm 50 mm. A new fabric samplemust be used for each test. Alternatively, a longer piece of fabric with 50 mm wid
8、th can be cut and a freshsection for each test must be used.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 GMW16953 Copyright 2013 General
9、Motors Company All Rights ReservedJune 2013 Page 2 of 83.2.3 Test Weight. One (1) 1000 g weight.3.2.4 Test Piece Support: Metal flange 150 mm minimum in length, with production representative thickness.3.3 Test Vehicle/Test Piece. Three (3) weatherstrip sections approximately 150 mm in length; cut f
10、romfinished weatherstrips.3.4 Test Time. Not applicable.3.5 Test Required Information. Not applicable.3.6 Personnel/Skills. Not applicable.4 Procedure4.1 Preparation. Not applicable.4.2 Conditions.4.2.1 Environmental Conditions. The minimum time between manufacturing and testing shall be 72 h. Thete
11、st pieces shall be maintained at a temperature of 23 C 5 C and 50% 5% relative humidity for at least24 h prior to test, and shall be free from strain during this period.4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Suchrequirements shall be spe
12、cified on component drawings, test certificates, reports, etc.4.3 Instructions.4.3.1 Cut test fabric along the thread. To achieve a test fabric with persistent longitudinal strands over thecomplete length, it may be necessary to prepare a wider strip and remove lateral strands until specified widthi
13、s achieved. Install the wear fabric securely onto the test fixture. Fabric shall be free of wrinkles, folds or tears.Unless otherwise specified, the angle between the test fabric and the bottom plate shall be 15 degrees whenthe load is at the upper position.4.3.2 If the weatherstrip specimen has a t
14、ear strip (pull cord), remove it prior to testing.4.3.3 Mount the weatherstrip sample securely on the test fixture, perpendicular to the fabric. Position thesealing bulb away from the test machine. Ensure that the weatherstrip sample does not move or rock on thefixture. Drape the fabric over the sea
15、l, with the residual length of fabric hanging loosely over the seal. Securelyattach the 1000 g weight to the end of the fabric. The angle between the weatherstrip specimen and theabrasion fabric shall be 90 degrees. (See Appendix A, Figure A2). An angle of 45 degrees may be agreed to;e.g., when the
16、bulb is deformed too much at 90 degrees and/or the bulb moves during the test, (test setup for90 degree angle, see Figure A3 in Appendix A).4.3.4 Set the machine to run at 1000 cycle intervals; inspect sample for abrasion after each interval of1000 cycles. Repeat this process until the required numb
17、er of cycles (as defined in Table 1) is complete orcoating wear through occurs. One (1) cycle is one to and fro movement.Table 1: Coding for Test CyclesCoding Number of CyclesA 2500B 5000 (default)C 10 000D See part drawing4.3.5 Repeat 4.3.1 through 4.3.4 for each remaining weatherstrip specimen.5 D
18、ata5.1 Calculations. Not applicable.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 GMW16953 Copyright 2013 General Motors Company All Right
19、s ReservedJune 2013 Page 3 of 85.2 Interpretation of Results. Due to edge effect of the fabric, only rate the inner 30 mm of the weatherstriptest piece. The substrate must not be damaged. Slight running tracks are permissible. See Appendix A,Figures A4 and A5.Table 2: Abrasion RatingAbrasion Grade A
20、ppearance Evaluation0 Only change in appearance OK1 Slight wear of coating, not exposing rubber substrate OK2 Wear at fabric edges only OK3 Wear of coating away from the edges of the test fabric NOK4 Coating completely worn, substrate exposed NOKNote: OK = Okay, NOK = Not Okay5.3 Test Documentation.
21、 With reference to this test procedure, the results shall be represented in a testreport. The test report shall include the following:5.3.1 Complete identification of the specimen.5.3.2 Conditioning of the test specimen.5.3.3 Test conditions.5.3.4 Any deviations to the test procedure.5.3.5 Observati
22、ons of the condition of each tested area.5.3.6 Number of cycles before coating wear through, rounded to the last full thousand cycles.6 SafetyThis standard may involve hazardous materials, operations, and equipment. This standard does not propose toaddress all the safety problems associated with its
23、 use. It is the responsibility of the user of this standard toestablish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.7 Notes7.1 Glossary. Not applicable.7.2 Acronyms, Abbreviations, and Symbols.NOK Not OkayOK Okay8 Coding SystemThis st
24、andard shall be referenced in other documents, drawings, etc., as follows:Test to GMW16953 Code Y Abrasion Grade Z maximumWhere: Code Y as defined in Table 1 (4.3.4)Abrasion Grade Z as defined in Table 2 (5.2)If no code is specified, test shall be run to Code B.Copyright General Motors Company Provi
25、ded by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16953 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 4 of 89 Release and RevisionsThis standard was or
26、iginated in April 2013. It was first approved by the Elastomers GSSLT in June 2013. Itwas first published in June 2013.Issue Publication Date Description (Organization)1 JUN 2013 Initial publication.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for Res
27、aleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16953 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 5 of 8Appendix AFigure A1: Abrasion Test Machine; Martindale Fabric with 90 Angle to Weatherstrip and Additional
28、Guiding Device for 45 Degree SetupCopyright 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 GMW16953 Copyright 2013 General Motors Company All Rights
29、ReservedJune 2013 Page 6 of 8.Figure A2: Test Fabric and Test Piece SetupMartindale Fabric with 90 Angle to Weatherstrip and Additional Guiding Device for 45 Degree SetupFigure A3: Test Fabric and Test Piece Setup, SketchCopyright General Motors Company Provided by IHS under license with General Mot
30、ors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16953 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 7 of 8Only Wear at Fabric EdgeOnly Change in Gloss, no Wear Through of the CoatingOnly Cha
31、nge in Gloss, no Wear Through of the CoatingFigure A4: Examples of OK Results for Rating of Wear for Test SamplesCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE E
32、NGINEERING STANDARDS GMW16953 Copyright 2013 General Motors Company All Rights ReservedJune 2013 Page 8 of 8Wear Through of the CoatingWear Through of the CoatingWear Through of the CoatingFigure A5: Examples of NOK Results for Rating of Wear for Test SamplesCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
