1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW3214 Sagging Resistance of Automotive Textile Materials Copyright 2011 General Motors Company All Rights Reserved October 2011 Originating Department: GME Specification Center Page 1 of 3 1 Scope Note: Nothing in this standard supercedes applicable
2、laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This standard is used to determine an automotive seat materials resistance to sagging as a result of an applied load and subsequent recovery for pr
3、escribed periods. 1.2 Foreword. Not applicable. 1.3 Applicability. Textiles, leathers, plastic roll goods and other materials requiring sagging resistance in their application. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Spe
4、cifications. None 2.2 GM Standards/Specifications. GMW3221 2.3 Additional References. Opel Drawing No. 80 020 000 3 Test Equipment 3.1 Sagging Resistance Tester (Opel Drawing No. 80 020 000; see Appendix A, Figure A1). 3.2 Cutting dies or shears for preparation of test specimens. 3.3 Apparatus for c
5、onditioning to the appropriate requirements as described in GMW3221 Code A, unless otherwise specified in the relevant material specifications. 4 Test Material A minimum of three (3) test specimens (280 5) mm in diameter shall be taken randomly across the roll width. 5 Test Method 5.1 Summary of Tes
6、t Method. While a test specimen is rigidly held over an opening, a prescribed load is applied to the material over the opening. The load is then removed and the specimen allowed recovering. The results are expressed as the amount of deformation remaining after a prescribed time has elapsed. 5.2 Test
7、 Sample Preparation. 5.2.1 Unless otherwise specified in the relevant material specification, conditioning shall be performed according to GMW3221 Code A. 5.3 Test Procedure. 5.3.1 The test specimen shall be placed on the annular base plate and securely tightened by the clamping ring, ensuring that
8、the surface is smooth, flat and free from stress. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3214 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 2 of 3 5.3.2 The top plate of the
9、 clamping device shall be tightly screwed onto the platform of the test equipment. For laminated materials the clamping ring may be omitted. Such test specimens shall be securely tightened only by means of the top plate. 5.3.3 The indenter and rod shall be gradually lowered until a pre-force F0 = (1
10、.5 0.1) N is applied to the test specimen. That pre-force shall be held for (10 1) s, and then the vernier scale shall be zeroed. 5.3.4 The total test force F = (50 5) N (which equals F0 + force exerted by any additional weights, F1) shall be applied for (60 1) minutes. 5.3.5 All forces shall be rem
11、oved and the test specimen allowed to recover for (60 1) minutes. 5.3.6 The pre-force F0 shall be re-applied and the resulting depth of penetration recorded after (10 1) s. 6 Evaluation and Rating 6.1 Calculate the arithmetic average of three test results in mm rounded to the nearest 0.1 mm. 6.2 Dev
12、iations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 7 Report Report each specimens penetration depth and the arithmetic average of all three specimens. 8 Safety This standard may invo
13、lve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems 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 limi
14、tations prior to use. 9 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW3214 10 Release and Revisions This standard was originated in February 1999. It was first approved by the Worldwide Fabric Specification Team in August 2000. It was firs
15、t published in December 2000. Issue Publication Date Description (Organization) 1 DEC 2000 Initial publication. 2 OCT 2011 5-Year-refresh, NOT TO TEMPLATE (Worldwide Fabric Specification Team) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDW
16、IDE ENGINEERING STANDARDS GMW3214 Copyright 2011 General Motors Company All Rights Reserved October 2011 Page 3 of 3 Appendix A Figure A1: Sagging Resistance Test Equipment1 Rod (graduated in mm) 2 Adjustable Vernier 3 Additional Weights 4 Hemispherical Indentor 5 Top Plate 6 Clamping Ring 7 Annular Base Plate 8 Clamping Device Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
