GMKOREA EDS-T-7131-2008 DETERMINING TORSIONAL FORCE-DEFLECTION CHARACTERISTICS OF ELASTOMERIC COMPONENTS UNDER UNI-AXIAL.pdf

1、GM DAEWOO Auto Uni-axial stress defines the case in which the only force acting on the elastomeric component is the torque M acting along the axis of rotation of the elastomeric component. 3.2. Torque M; The torque M is the moment acting on the elastomeric component to produce a stress. Its magnitud

2、e and direction shall correspond with the installation conditions. 3.3. Initial torque Mv;The initial torque Mvis the torque which is applied to the elastomeric component in order to establish a initial data point for measurements. Its magnitude is normally 1 to 2% of torque max M, and its direction

3、 is the same as that of torque max M. 3.4. Torque max M; The torque max M is the maximum torque M with which the elastomeric component is stressed in addition to the initial torque M. 3.5. Angle; It is the rotational angle of the clamp for rubber parts to the direction of torque application. 3.6. In

4、itial Angle v ; The initial angle vis the angle through which the clamping devices on the elastomeric component rotate relative to each other under the effect of initial torque Mv, in the direction of application of torque Mv. 3.7. Angular velocity ; The Angular velocity is the constant angular velo

5、city at which the clamping devices on the elastomeric component are rotated relative to each other by torque M. 3.8. Torsional force-deflection curve M = f( ); The torsional force-deflection curve M = f( ) is the mapping of the relationship between torque M and the angle when the applied torque incr

6、eases from M = Mvto M = Mv+ max EDS-T-7131DETERMINING TORSIONAL FORCE-DEFLECTION CHARACTERISTICS OF ELASTOMERIC COMPONENTS UNDER UNI-AXIAL PAGE: 2/5 ISSUED DATE: 1993. 07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto One stress cycle is the sequence whereby the elastomeric component is st

7、ressed by a torque steadily increasing from M = Mvto M = Mv+ max M, and then steadily reducing back to M = Mv. 3.10. Initial curve; The initial curve is the curve obtained during the first stress cycle of stress cycle. 3.11. Angle f ; The angle fis the angular change between the clamping devices on

8、the elastomeric component relative to one another which is measured from the commencement of the first stress cycle until the end of the third stress cycle. The angle fmay be due to creep properties of the elastomer, or slipping between interference fits on the component. 3.12. Subscripts; Alphabeti

9、cal and numerical subscripts shall be used to identify measurement values and stress directions. 3.12.1. Alphabetical subscripts indicate the type of measurement value. e.g. Mv : the torque initially applied. 3.12.2. Numerical subscripts identify the direction of application of a stress, generally d

10、enoted by i. i may take a value 1, 2, 3 - n. The numerical subscripts shall follow any alphabetical subscript. e.g. Mv1, 1- If there is only one direction of torque application, the numerical subscript 1 can be excluded. e.g. Mv- 4. TEST SAMPLES 4.1. Test sample form The test sample shall be elastom

11、eric components, which are as assembled into the vehicle. 4.2. Test sample quantity At least three test samples shall be tested. 4.3. Test sample conditioning For initial sample approval and arbitration purposes, the minimum time period between vulcanization and testing shall be 7 days. For routine

12、quality control purpose, the period shall be 3 days. The test sample shall remain at a temperature of 235 for at least 8 hours before testing, and shall be free from strain during this period. 5. TEST EQUIPMENT 5.1. A torsion testing machine, capable of stressing elastomeric components up to a maxim

13、um torque max M = 350Nm at a constant angular velocity (max deviation; 10%). The machine shall comply with DIN 51220, and also comply with the following requirement. EDS-T-7131DETERMINING TORSIONAL FORCE-DEFLECTION CHARACTERISTICS OF ELASTOMERIC COMPONENTS UNDER UNI-AXIAL PAGE: 3/5 ISSUED DATE: 1993

14、. 07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto & Technology accuracy of torque measuring equipment : 2% of the measured value torsional displacement measuring equipment : 1.75 m rad 5.2. Suitable jigs for fixing the test sample to the testing machine. 6. TEST PROCEDURE 6.1. General Th

15、e test sample shall be tested according to the data given on the test specifications and the relevant engineering drawing of the elastomeric component regarding method of assembly, direction of stressing, degrees of clearance, etc., in addition to compliance with this test method. A period of at lea

16、st 24 hours shall elapse before successive tests on the same test sample are performed. 6.2. Test method 6.2.1. Mount the sample onto the torsion testing machine. 6.2.2. Apply a torque until Mi= Mvi, stop torsion testing machine and adjust torque measuring equipment so that Mi= 0. And, adjust angle

17、f to i= 0. 6.2.3. Gradually increase the torque by Mi= max Mi(as specified on part drawing) at an angular velocity i and subsequently reduce this torque at the same angular speed by Mi= Mv (stress cycle). Repeat this stress cycle 3 times. 7. EVALUATION 7.1. Record the initial curve Mi= f(i) of the t

18、orsional force-deflection curve. 7.2. Record the fourth curve of force-deflection curve in the range from Mi= MvIto Mi= MvI+ max Mi, and also record fi. 7.3. For tolerance checking, the curve Mi= f(i) and the angle fidetermined in clause 7.2 shall be used. The zero point of the tolerance band for th

19、e curve Mi= f(i) is variable along the abscissa of the diagram up to the angle max fi. 8. TEST REPORT In the test report, the load-displacement curve and displacement angle ( fi) shall be entered. When harmful defects (crack or damage in product) are developed during test, such shall be stated. 9. C

20、ODING SYSTEM The requirements for the torsional force-deflection curve of elastomeric component shall be specified on component drawings, test and material specifications, reports, etc. EDS-T-7131DETERMINING TORSIONAL FORCE-DEFLECTION CHARACTERISTICS OF ELASTOMERIC COMPONENTS UNDER UNI-AXIAL PAGE: 4

21、/5 ISSUED DATE: 1993. 07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto & Technology Torsional Test EDS-T-7131 Mv = N.m max M = N.m = rad/s initial curve M = f ( ) Designation Test method Test condition and requirement 10. INSPECTION OF TEST EQUIPMENT The test equipment shall be calibrated

22、 at intervals not exceeding one year and certification retained. 11. DEVIATIONS Deviations from the requirements of this test method(e.g. test sample preparation, technical details of the testing machine, etc) shall have been agreed upon. These requirements shall be specified on component drawings,

23、and defined in test reports etc. 12. TYPICAL TORSIONAL FORCE - DEFLECTION CURVE OBTAINED DURING THE TEST PROCEDURE FOR THE DETERMINATION OF Mi= f(Mi) (refer also to clauses 6 and 7 of this test method). EDS-T-7131DETERMINING TORSIONAL FORCE-DEFLECTION CHARACTERISTICS OF ELASTOMERIC COMPONENTS UNDER

24、UNI-AXIAL PAGE: 5/5 ISSUED DATE: 1993. 07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto & Technology 13. TOLERANCES RANGE OF TORSIONAL FORCE-DEFLECTION CHARACTERISTICS ON DRAWINGS. (Refer also to clause 7 of this test method) 14. REFERENCE DIN 51220 Material testing machine, general regulations GME 60235 Determination of the torsional force-deflection characteristics of elastomeric components under uni-axial