GMW GMW14363-2013 Determination of Indentation Hardness of Foam Components at Constant Force Issue 2 English.pdf

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1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14363 Determination of Indentation Hardness of Foam Components at Constant Force Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 1 of 6 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. N

2、ote: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure shall be used to determine the indentation hardness of small elastic foam components where the size of the component precludes the use of other standa

3、rd methods. The results obtained by measurements on components of differing shapes, or at different locations on the same component, or by the use of different sized indentors are not necessarily comparable. Test results obtained by measurements on components of similar shape, but of different struc

4、tures (cellular, etc.), are comparable provided measuring conditions are identical. The indentation hardness is defined as the depth of penetration (in millimeters) of a standard shaped indentor when pressed under constant force into the foam component for 30 s, 60 s, or other time as may be specifi

5、ed. 1.2 Foreword. Not applicable. 1.3 Applicability. Polyurethane (PUR) back foaming Instrument panel, headrest, armrest, soft integral foam. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 5893 2.2 GM Standa

6、rds/Specifications. GMW3221 3 Resources 3.1 Facilities. Not applicable. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring

7、 variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. 3.2.1 Suitable test equipment is a tensile testing machine complying with ISO 5893, equipped with a compression gauge and capable of maintaining the specified constant for

8、ce over the specified period. 3.2.2 Alternative test equipment shown in Figure 1 is suitable. 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 STANDARD

9、S GMW14363 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 2 of 6 Key: 1 Dial gauge (mounted on base plate) 2 Arm which actuates dial gauge 3 Weights added 4 Weight table 5 Guides etc., attached to base stand, and allowing free movement of rods. 6 Rod 7 Indentor 8 Compon

10、ent 9 Support 10 Baseplate Figure 1: Alternative Test Equipment 3.2.3 The test apparatus shall consist of an indentor (steel, aluminum or wood of dimensions as given in Table 1) and means of applying this indentor to the component under a pre-force and primary force (see Table 1). 3.2.4 Means of mea

11、suring the depth of penetration of the indentor into the component to an accuracy of 0.01 mm. 3.2.5 A supporting surface made of a suitable material shall be shown on the relevant engineering drawing. 3.2.6 Stopwatch subdivided in 0.1 s. 3.2.7 For first sample approval and arbitration purposes, the

12、method described in 3.2.3 shall be used. 3.3 Test Vehicle/Test Piece. See 3.2.5 (dependent on part geometry). 3.3.1 Shape of Test Piece. The complete component shall be used as a test piece in accordance with the engineering drawing. 3.3.2 Number of Test Pieces. 3.3.2.1 For initial sample approval a

13、nd arbitration purposes, the indentation hardness shall be determined on a minimum of 5 test pieces. 3.3.2.2 For routine quality control, a minimum of 3 test pieces shall be used. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Pr

14、ocedure 4.1 Preparation. 4.1.1 Components for first sample approval and arbitration purposes shall be tested not less than 7 days after manufacture. 4.1.2 Components for routine quality control purposes shall be tested not less than 3 days after manufacture. 12345678910Copyright General Motors Compa

15、ny Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14363 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 3 of 6 4.1.3 Conditioning according

16、to GMW3221, Code A. 4.2 Conditions. See 4.1.3. 4.2.1 Environmental Conditions. GMW3221, Code A. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instr

17、uctions. 4.3.1 Indentor Load and Configuration. See Table 1 and Appendix A, Figure A1. Table 1: Indentor Load Code Indentor Dimension Pre-force Primary force A 32 mm 0.1 mm rounded to a spherical radius of 30 mm 0.5 N 0.1 N 50 N 0.1 N B 12.5 mm 0.1 mm, spherical radius of 6.25 mm 0.1 mm 5 N 0.1 N 10

18、 N 0.1 N C 5 N 0.1 N 20 N 0.1 N D 200 mm 2 mm disk 4.9 N 0.1 N - Figure 2: Indentor Dimension per Code 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

19、 STANDARDS GMW14363 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 4 of 6 4.3.2 Testing Time. See Table 2. Table 2: Test Time Code Time 1 30 s 1 s 2 60 s 1 s 3 Specially defined 4 20 s 1 s 4.3.3 Feed Rate Using the Test Facility to Paragraph 3.2.1. The feed rate for mol

20、ded parts in the test range following thickness is specified below. This is important because it will influence the duration of the test. It is matched with the time from Pre-force (0.5 N) to Primary Force (50 N). Examples: a) Instrument panel (IP) backfoaming hardness range 3 mm to 7 mm (20 mm/minu

21、te), b) Headrest hardness range 10 mm to 18 mm (50 mm/minute). 50 mm 100 mm/minute 20 to 50 mm 50 mm/minute 20 mm 20 mm/minute 4.3.4 Procedure. 4.3.4.1 Test shall be performed immediately after conditioning and shall be performed at +22 C 3 C, 50% 5% relative humidity (RH). 4.3.4.2 The test piece sh

22、all be assembled to the support surface according to 3.2.5, ensuring that the area of test, as indicated on the engineering drawing or specification, is correctly aligned with the indentor. 4.3.4.3 The specified pre-force shall be applied to the test piece, the measuring device adjusted to zero, and

23、 the primary force then applied (see Table 1). 4.3.4.4 After the required testing time (see Table 2), the penetration of the indentor shall be read off to the nearest 0.01 mm. 5 Data 5.1 Calculations. The indentation hardness of foam components determined as per this test procedure shall be recorded

24、 in a test report to the nearest 0.1 mm and quoted as such in material specifications, engineering drawings, etc. 5.2 Interpretation of Results. It is important to fix hardness requirement of foam components. 5.3 Test Documentation. Record in a test report. When testing several components, each dete

25、rmined value shall be recorded separately. 6 Safety This standard may involve 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 safe

26、ty and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. IP Instrument Panel PUR Polyurethane RH Relative Humidity Copyright General Motors Company Provided by IHS under license wit

27、h General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14363 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 5 of 6 8 Coding System This standard shall be referenced in other docume

28、nts, drawings, etc., as follows: Test to GMW14363-A1 Where: A indicates Code per 4.3.1 1 indicates Code per 4.3.2 9 Release and Revisions This standard was originated in September 2005. It was first approved by the Global Foam team in December 2006. It was first published in February 2007. Issue Pub

29、lication Date Description (Organization) 1 FEB 2007 Initial publication. 2 FEB 2013 Five year refresh of standard - converted from Test Method to Test Procedure. (Textiles & Trim Materials Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General M

30、otors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14363 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 6 of 6 Appendix A Figure A1: Indentor Configuration and Dimensions Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-