GMW-14683-2007.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Method Materials GMW14683 Force-Deflection Characteristics of Elastomeric Components Under Bi-axial Stress Copyright 2007 General Motors Corporation All Rights Reserved November 2007 Originating Department: North American Engineering Standards Page 1 of 5 1 Scop
2、e 1.1 Determination of spring characteristic of elastomeric components. The test, according to this test method, provides information on the visco- elastic behavior of the elastomers used. 1.2 Determination of stressability of the elastomeric components in the installation position in vehicles and i
3、n accordance with the installation conditions. Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 2 References Note: Only the latest approved standards are ap
4、plicable unless otherwise specified. 2.1 External Standards/Specifications. DIN 862 DIN 51220 DIN 876 ISO 7500-1 DIN 878 ISO 9513 DIN 6370 2.2 GM Standards/Specifications. GMW14734 3 Test Equipment 3.1 Calibration. The test facilities and equipment shall be in good working order and shall have a val
5、id calibration label. 3.2 Universal Testing Machine. For stressing of elastomeric components up to 50 kN maximum with constant velocity v (maximum deviation 10%), short form in text “Universal testing machine“. 3.2.1 Version According to: DIN 51220 ISO 7500-1 ISO 9513 3.2.1.1 Accuracy of: Force meas
6、urement: 1.5% of the relevant value. Deflection measurement: 0.05 mm. 3.2.1.1.1 Total deformation of universal testing machine frame, testing and clamping devices etc. 1% of deformation of the elastomeric components subjected to force Fmax (+ Fv). In this case, correction of the measurement results
7、by the deformation of the testing machine is not necessary. 3.2.2 If the deformation of universal testing machine frame, testing and clamping devices etc. is within the range 1% to 10% of deformation of the elastomeric components, then correction of the measurement results shall be performed. 3.2.3
8、Measurements with testing equipment, in which deformation 10% of the deformation of the elastomeric components are not permissible. Note: The measurement of deformation of the testing equipment shall be performed using a “rigid substitute body” under the same testing and configuration parameters as
9、the component measurement. 3.2.3.1 The velocity vi shall be selected according to the application. The correction measurement shall cover the entire evaluation area. 3.2.3.2 The “rigid substitute body” is defined as the outer contour of the elastomeric component pressed into the corresponding compon
10、ent mount, according to the relevant component drawing, with an inserted pin. 3.2.3.3 The pin shall be tightened to the specified torque according to the elastomeric component drawing. 3.3 A test device for applying an additional constant force Fj to the elastomeric component hereafter referred to a
11、s the “test device“. 3.3.1 A test device which enables a stress to be gradually applied to the elastomeric component, up to a force Fj = Fvj + Fj maximum at a constant velocity of (1.25 0.10) x 10-3 m s-1, and subsequently maintains this force at a constant value. The moment at which the force reach
12、es its maximum value shall be indicated by the test GMW14683 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2007 General Motors Corporation All Rights Reserved Page 2 of 5 November 2007 device. The test device shall span a range of force from 50 to 4000 N with an accuracy of 10 N. 3.3.1.2 Test devices
13、 which apply the force by means of suitable masses, such as lever systems, are preferred. 3.4 Workbench with machine vice 160 DIN 6370. 3.5 Measuring plate according to DIN 876 made of cast iron, 400 x 400 mm. 3.6 Testing and clamping devices for installing and fastening the elastomeric components o
14、n the universal testing machine. Roller tables and roller or ball straight-line mechanisms for forces up to 10 kN. 3.7 Stop watch or clock with a display range of 600 s and a reading accuracy of 0.1 s. 3.8 Dimensional Measuring Equipment. 3.8.1 Dimensional change measuring instrument, e.g., dial gau
15、ge according to DIN 878 with a display range of 25 mm, a measuring accuracy of 0.01 mm and constant measuring force over the measuring path of 2 N. 3.8.2 Dimensional measuring instrument, e.g., caliper gauge according to DIN 862. 3.8.3 Dimensional measuring instrument, e.g., high-accuracy marking ga
16、uge with fine adjustment of the slider, vernier 0.1 mm, marking height 500 mm maximum. 4 Test Material 4.1 Test Sample Form. Test samples are elastomeric components (elastomeric components or elastomeric/metal components), which are used as components in vehicles. 4.2 Number of Test Samples. At leas
17、t three test samples shall be tested. 5 Test Method Deviations from this standard particularly deviations from the test sample pre-treatment, the technical data of the testing equipment, the stressing times and the test temperatures shall have been agreed upon. Such requirements shall be specified o
18、n the part drawings etc. and in test certificates, reports and similar. 5.1 Summary of Test Method. Testing of the deformation of elastomeric components for vehicles (elastomeric components or elastomeric/metal components) with constant velocity at + 23 5C. 5.2 Test Sample Preparation. For initial s
19、ampling and in cases of arbitration, the test shall be performed no earlier than seven days, and for continuous quality control no earlier than 72 h, after vulcanization. Before testing, the test samples shall be stored in an unstressed condition for at least 8 h at +23 5C. 5.3 Test Procedure. 5.3.1
20、 General. The test sample shall be tested according to the data shown in the test specifications and the design drawings of the elastomeric component with regard to installation instructions, stressing devices etc., as well as in accordance with the relevant test procedure. Between two tests on the
21、same test sample, a period of at least 24 h shall elapse. Before testing, the weight of the test sample, the testing and clamping devices etc. shall be compensated on the universal testing machine and test device, if this has an influence on the force display or the forces Fi and Fj. 5.3.2 Determina
22、tion of Height h0i. The height h0i shall be measured according to GMW14734 at + 23 5C, if this value is required for the elastomeric component. 5.3.3 Test Procedure. The test sample shall be stressed with Fj = Fvj at a velocity of (1.25 0.10) x 10-3 m/s, the dimensional change measuring equipment sh
23、all be set to zero (sj = 0), and the stress shall be reduced with an equal speed to zero Fj = 0. This cycle shall be repeated until the deflection change under stress Fvj is 0.01 mm (normally three cycles will be sufficient). The zero point of the dimensional change measuring equipment is then fixed
24、. 5.3.4 Increase the force, applied to the elastomeric component under test, at a velocity of (1.25 0.10) x 10-3 m/s until the total force of Fj = Fvj + Fj max is applied. This time is t = t0, and shall be indicated by the test device. The measuring period shall commence at this time. The force Fj,
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