GMKOREA EDS-T-7407-2008 DETERMINATION OF TENSILE STRENGTH AND ELONGATION TO FAILURE OF ELASTOMERIC COMPONENTS (VERSION 5 Replaced by GMW14739).pdf

1、GM DAEWOO Auto The force F shall be the force applied to the elastomeric component. 3.2. Force FR; The force FRis the maximum tensile force applied to the elastomeric component up to failure. It acts in the direction of the force F. 3.3. Force-application point; The force-application point is the po

2、int that the head of the universal testing machine is attached to the elastomeric component or test fixture. The force-application point is located along the direction of application of the force F. 3.4. Velocity V; The velocity V is the constant velocity V with which the force-application point mov

3、es in the direction of application of the force F. 3.5. Deflection S; The deflection S is the distance through which the force-application point moves under the force F during deformation of the elastomeric component and measured in the direction of application of the force. 3.6. Force-deflection cu

4、rve F = f(s); The force-deflection curve F = f(s) is the relative curve between force F and deflection S during increasing the force F=0 to F=FR. 3.7. Ultimate deflection SR; SRis the distance through which the force-application point moves under FRduring deformation of elastomeric component. It is

5、measured in the direction of the deflection S. 3.8. Suffixes; To determine the forces, dimensions and direction or identify application correctly, alphabetical and numerical suffixes shall be used. 3.8.1. Alphabetical subscripts shall be used to identify the type of force or dimension. (e.g.) FR: Te

6、nsile force 3.8.2. Alphabetical suffixes shall be used to identify the test conditions as defined by clause 6.4, generally designated by j, which may take the form A, B, C Q. EDS-T-7407DETERMINATION OF TENSILE STRENGTH AND ELONGATION TO FAILURE OF ELASTOMERIC COMPONENTS PAGE: 2/4 ISSUED DATE: 1993.

7、07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto & Technology (e.g.) FG : Denotes a force F given under the conditions denoted by test type G. 3.8.3. Numerical subscripts shall be used to identify the direction in which a force is applied, generally designated by i, which may take the for

8、m 1, 2, 3 . n. The numerical subscripts shall follow the alphabetical subscripts. (e.g.) FGR1, sR1. If there is only one direction of force application, the numerical subscripts 1 can be excluded. (e.g.) FGR, sR. 4. TEST SAMPLES 4.1. Test samples form The test samples shall be elastomeric components

9、 as assembled into the vehicle. 4.2. Test samples quantity At least three test samples shall be tested. 4.3. Test samples conditioning For initial sample approval and arbitration purposes, the minimum period after vulcanization shall be 7 days. For routine quality control purposes, the period shall

10、 be at least 3 days. The test piece of elastomer shall remain at a temperature 235 for at least 8 hours before testing, and shall be free from strain during this period. 5. APPARATUS 5.1. Universal testing machine A universal testing machine (hereafter referred to as the testing machine), capable of

11、 stressing elastomeric components to a maximum force of 50kN at a constant velocity (permitted deviation10 %). The testing machine shall comply with DIN 51220, 51221 sheet 1 to 3, DIN 51223, 51227 or BS 1610, and also comply with the following requirements. accuracy The force measuring equipment : 1

12、5 % of the measured value Displacement measuring equipment : 0.05 mm 5.2. Chamber for preconditioning of test sample environmental test The chamber shall be of the air-circulating type, and comply with the following requirements. Temperature range : -30 to +150 Temperature variation : 2K Temperatur

13、e change rate : at least 1.5K/minute for empty chamber. 5.3. Suitable jig capable of fixing the test samples to the testing machine. 6. PROCEDURE 6.1. General EDS-T-7407DETERMINATION OF TENSILE STRENGTH AND ELONGATION TO FAILURE OF ELASTOMERIC COMPONENTS PAGE: 3/4 ISSUED DATE: 1993. 07. 13 REVISED D

14、ATE: 2008. 10. 15 VERSION: 5 GM DAEWOO Auto & Technology The test sample shall be tested according to the data shown on the test specifications and the relevant component drawings for the elastomeric component regarding method of assembly, direction of stressing in addition to this test method. If t

15、he force or the force indicating device on the testing machine is influenced by the weight of the test sample and/or fixtures, compensation shall be made prior to testing. 6.2. Conditioning The test samples shall be conditioned to requirements specified in clause 6.4 and subsequently tested at that

16、temperature as follows. 6.3. Test method Set the force and deflection measuring equipment tozero, then extend the test sample from Fji = 0to Fji = FjRi , i.e. until failure , at a constant velocity of vi (on component drawings) 6.4. Conditioning and test temperatures One of the following conditionin

17、g period shall be applied, as specified on the relevant component drawings, test specification or material specification. The test shall be carried out at the conditioning temperature. Conditioning Code Letter Conditioning Time (H) Test Temperature (K)NONE 8 min. 23 5 A 168 0-2-30 3 B 72 0-2-30 3 C

18、3 +10-30 3 D 168 0-2-20 3 E 72 0-2-20 3 F 3 +10-20 3 G 168 0-2-10 3 H 72 0-2-10 3 I 3 +10-10 3 K 3 +1023 5 L 3 +1050 2.5 M 3 +1070 2.5 N 3 +1080 2.5 O 3 +10100 2.5 P 3 +10125 2.5 Q 3 +10150 2.5 7. EVALUATION 7.1. Record the tensile force and elongation to failure. 7.2. In case of there is a special

19、requirement on the drawing or material specification, then record the initial curve of Fji = f(sji) of the force deflection curve. EDS-T-7407DETERMINATION OF TENSILE STRENGTH AND ELONGATION TO FAILURE OF ELASTOMERIC COMPONENTS PAGE: 4/4 ISSUED DATE: 1993. 07. 13 REVISED DATE: 2008. 10. 15 VERSION: 5

20、 GM DAEWOO Auto & Technology 8. TEST REPORT In addition to reference being made to this test method, the test report shall be also include the following data : Part name, part number, drawing number, test spec. number, manufacturer, test sample number, date of test and the following value shall be n

21、oted. Force FjRi (N) Ultimate deflection sjRi(mm) Initial force-deflection curve Fji= f(sji) Any specific observations on the test sample, e.g. creases, cracks, splits, or other visible defects shall be recorded on the report. 9. CODING SYSTEM The requirements for the tensile strength and elongation

22、 characteristics of elastomeric components shall be specified on component drawings, test and material specifications, reports, etc., as follows. Tensile Strength EDS-T-7407 FAR2= N sAR2= mm FA2 = f(sA2) Test method Designation vi = m/s Test conditions and requirements 10. DEVIATIONS Deviations from

23、 the requirements of this 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, and shall be indicated in test reports etc. 11. REFERRENCE DIN 862 Gauge block DIN 878 Dial gauge DIN 51220 Verification of testing machine DIN 51221 Tensile testing machine DIN 51223 Compression testing machine DIN 51227 Bending testing machine GME 60238 Determination of the tensile strength and elongation to failure of elastomeric components