GMW-14453-2006.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure Interior GMW14453 Material Settling/Deformation of Vehicle Floor Insulation Copyright 2006 General Motors Corporation All Rights Reserved February 2006 Originating Department: GME Specification Center Page 1 of 4 1 Scope Note: Nothing in the specificat
2、ion supersedes applicable laws and regulations unless specific exemption has been obtained. 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 and settling characteristics o
3、f flexible substances in the foot well/foot rest area, which is caused by a static force. 1.2 Foreword. Acoustically absorbent substances possess a certain yield when under load. This characteristic can be felt to be unpleasant on a subjective basis. Therefore it is useful to examine these materials
4、 and determine their flexibility characteristics using physics. 1.3 Applicability. For flexible/yielding and acoustic insulation materials which occur both as individual component or combined with coverings. 2 References Note: Only the latest approved standards are applicable unless otherwise specif
5、ied. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 3 Resources 3.1 Facilities. 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 ti
6、me during the test. In addition, the test equipment shall be in a position to measure the settling 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 Cali
7、per gauge, measuring tape or dial gauge. 3.2.4 Test load: 5 kg 3.3 Test Vehicle/Test Piece. The test piece shall consist of homogeneous material of an even thickness. The area to be tested is (500 x 500) mm. In the case of composite systems, the entire system is tested (covering + insulation). If th
8、e covering is loose laid, this shall be removed before the test. 2 test pieces are measured. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Material characteristics of the test piece. 3.6 Personnel/Skills. Technical personnel. 4 Procedure 4.1 Preparation. Test pieces and load-bearing
9、surface are placed on the measuring plate (see Figure 1). Then the initial measurement shall be performed (distance from measuring linkage to load-bearing surface without test load). 4.2 Conditions. 4.2.1 Environmental Conditions. The test shall be performed at +23 5C. 4.2.2 Test Conditions. Deviati
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