1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14453 Material Settling/Deformation of Vehicle Floor Insulation Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: GME Specification Center Page 1 of 6 1 Scope Note: Nothing in this standard supercedes ap
2、plicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. Determination or definition of the indentation (deflection/deformation) and settling characteristics of flexible floor carpet assemblies (
3、carpet, mass back and insulation), especially in the foot well, foot rest and rocker-surrounding areas, caused by the application of a static force. 1.2 Foreword. Floor Carpet Insulators are acoustically absorbent substances that possess a certain yield under load. An incorrect specification of the
4、floor carpet insulator deflection characteristics may translate into extremely soft or hard floor surfaces, which can be felt to be unpleasant on a subjective basis. On the other hand, an increased insulator deflection along the rocker-surrounding area may increase the risk for the overlapped carpet
5、 to be pulled out of the garnish sill plates, when the customer steps in the area during an egress/ingress operation. Therefore it is extremely important to examine these floor insulation materials and determine their flexibility, compression and indentation characteristics. 1.3 Applicability. This
6、standard applies to all floor carpet assemblies with flexible/yielding acoustic insulation materials. The carpet insulator materials include, but are not limited to, foam, fiber (dissipative carpet constructions) and cotton shoddy. In addition, this specification applies to floor carpet assemblies w
7、ith both the insulation layer as Part of the Assembly (POA) and as a separate component (non-POA). 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facili
8、ties. The test shall be performed on a flat, solid surface (preferably on a stable measuring plate). A specific force shall be maintained constantly on a defined area for a fixed period of time during the test. In addition, the test equipment shall be in a position that allows the measurement of the
9、 settling characteristics of the test piece under load. 3.2 Equipment. 3.2.1 Adjustable measuring linkage. 3.2.2 Base plate/load-bearing surface with a diameter of 80 mm (rigid material, e.g., 20 mm thick wood; PVC). 3.2.3 Caliper gauge, measuring tape or dial gauge. 3.2.4 Test load: 5 kg 3.3 Test V
10、ehicle/Test Piece. The test specimen should consist of a 300 mm x 300 mm with the following two different conditions: Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDW
11、IDE ENGINEERING STANDARDS GMW14453 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 6 1) A test sample of a homogeneous non-molded floor carpet section (with all pertaining construction layers, e.g. carpet pile, mass back, latex, PE, insulator, etc.) of an even thick
12、ness. Sample shell be completely flat prior to testing. This will guarantee a deformation measurement in the specimen (avoid air trapped underneath the test sample) 2) A test sample of a molded floor carpet section (with all pertaining construction layers, e.g. carpet pile, mass back, latex, PE, ins
13、ulator, etc.). The insulation layer thickness section shall be cut from the floor pan/foot rest area and in a way that comprehends the maximum insulator thickness allocated in that area of the floor carpet assembly design for a particular vehicle program. For carpet systems with the insulation layer
14、 as Part of the Assembly (POA), the entire system is tested (carpet + insulation); for carpet systems in which the insulation layer is non-POA, only the insulation layer is tested. 3 test pieces are measured per sample type condition (see paragraph 3.3). 3.4 Test Time. Not applicable. 3.5 Test Requi
15、red Information. Material characteristics of the test piece. 3.6 Personnel/Skills. Technical personnel. 4 Procedure 4.1 Preparation. Test pieces and load-bearing surface are placed on the measuring plate (see Figure 1). Then the initial measurement shall be performed, which corresponds to the distan
16、ce that exists between the Adjustable measuring linkage and the top face of the load-bearing surface, without a test load. This data point should be referred to as “Initial position of the load bearing surface, and should be recorded in the Data Sheet”. 4.2 Conditions. 4.2.1 Environmental Conditions
17、. The test shall be performed at (+23 5) C. 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 Instructions. Note: Deviations from the requirements list
18、ed in the following paragraphs shall have been agreed with the Floor Trim BOM Family Owner (BFO) and Interior Validation Total Integration Engineer (TIE). 4.3.1 After the initial measurement from paragraph 4.1, the test load is applied to the geometric center of the load-bearing element, which has b
19、een previously placed on top of the test piece. 4.3.2 Immediately after this, the deformation is measured using the gauge, and recorded as “Immediate Deformation in mm” in the data sheet (see Appendix A). The deformation in mm is related to the indentation characteristics of the test sample, when th
20、e load is applied. The maximum immediate deformation allowed is 9 mm. 4.3.3 Without removing the test load, and after 60 minutes, a further deformation measurement is taken and recorded as “Deformation after 60 minutes in mm” (see Appendix A). The maximum deformation allowed after 60 minutes is 9 mm
21、. 4.3.4 The permanent settling is the deformation seen by the test specimen after a stress-relief period of 60 minutes. The permanent settling characteristic of the test specimen is measured after removing the test load and providing a stress-relief period of 60 minutes, and should be recorded in th
22、e Data Sheet (see Appendix A). The maximum permanent settling allowed is 3 mm. 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 GMW14453 Copy
23、right 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 6 Figure 1: Test Set-Up 1 Adjustable measuring linkage 2 Test load 3 Caliper gauge / dial gauge 4 Test pieces 300 mm x 300 mm 5 Load-bearing surface (80 mm diameter) 6 Solid base 5 Data 5.1 Calculations. The absolute defor
24、mation values are produced from the difference between the initial position of the load-bearing surface and its position when deformed. 5.2 Interpretation of Results. The permissible immediate deformation and after 60 minutes of load application shall be of 9 mm maximum. GSSLT approval is required f
25、or case by case deviations and shall be documented in the component drawing. The permissible permanent settlement after 60 minutes stress-relief shall be 3 mm maximum. GSSLT approval is required for case by case deviations. Deviations are specified in the relevant drawing. Deviations are specified i
26、n the relevant drawing. 5.3 Test Documentation. The results shall be entered in the Data Sheet (see Appendix A) with reference to this Test Procedure, and shall be enclosed with the test report. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not
27、 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 limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms,
28、Abbreviations, and Symbols. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14453 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitt
29、ed without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14453 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 4 of 6 9 Release and Revisions This standard was originated in September 2005. It was first approved by Global Acoustic Treatments SSLT in February
30、 2006. It was first published in February 2006. Issue Publication Date Description (Organization) 1 FEB 2006 Initial publication. 2 NOV 2011 5 year refresh; conversion into new template. Content completely updated Copyright General Motors Company Provided by IHS under license with General Motors Com
31、panyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14453 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 5 of 6 Appendix A A1 Data Sheet Project: Test temperature: Object: Date: Design status: Test
32、er: Material structure: Test pieces Test piece 1 Test piece 2 Mean value Immediate deformation in mm Deformation after 60 minutes (9 mm maximum) Permanent settlement after 60 minutes stress-relief (3 mm maximum) Copyright General Motors Company Provided by IHS under license with General Motors Compa
33、nyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14453 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 6 of 6 Appendix B B1 Measuring Device List Date of measurement: Measuring Device Inventory no. / Serial no. calibrated until Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
