1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST EDS-T-7510 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 EDS-T-7510TESTING OF PLASTICS DETERMI
2、NATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST PAGE: 1/6 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology 1. PURPOSE This standard is used to determine the elastic modulus of plastics through tensile, compression and flexural
3、tests. 2. SCOPE This standard applies to the method of determining elastic modulus of plastics by conducting tensile, compression and flexural tests under specified conditions. 3. DEFINITION 3.1. Elastic modulus based on tensile test. Elastic modulus based on tensile test indicates the relation betw
4、een the stress( ) and elongation ( ) depending on extension of test pieces. If the elongation is very little with 0.5% max., Hooks law shall apply to the elastic modulus. &-“-P=Where, LOInitial marking line length L: : The deformation of length on the initial straight-line portion of the load-deflec
5、tion curve. F : The deformation of load on the initial straight-line portion of the load-deflection curve. A0: Sectional area of the test piece “ -3.2. Elastic modulus based on compression Elastic modulus based on compression test indicates the relation between the stress ( ) and compressibility (d)
6、 depending on compression of the test piece. If the compressibility rate is very little with 0.5% max., Hooks law shall apply to the elastic modulus. XLAFE00=Where, LO: Initial marking line length L: : The deformation of length on the initial straight-line portion of the load-deflection curve. F: Lo
7、ad : The deformation of load on the initial straight-line portion of the load-deflection curve. Ao: Sectional area of the test piece “ 9-3.3. Elastic modulus based on flexural EDS-T-7510TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST PAGE: 2/6
8、 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology Elastic modulus based on flexural test indicates the relation between the stress ( ), and the compressibility (d) or elongation ( ) on the test piece layer which is perpendicular to the test piece. If the el
9、ongation or compression of the outside layer is very little with 0.5% max., the following formula shall apply to the elastic modulus. E = (LV3/4bh3)( F/ X) Where, X : :The deformation of length on the initial straight-line portion of the load-deflection curve. F: :The deformation of load on the init
10、ial straight-line portion of the load-deflection curve. LV: Length of the marking line on the test piece (see Fig. 1) b : Width of the test piece h : Thickness of the test piece Fig. 1. Flexural load testing 4. PREPARATION OF TEST PIECES 4.1. Test specimens shall be prepared by compression or inject
11、ion molding of the material to be tested or by machining the material in sheets of an appropriate size. If the sheets are an isotropic ones, they shall be prepared in both of horizontal and vertical direction. 4.2. For tensile test, use a dumbbell type of test piece, the detail dimensions are follow
12、 the EDS-T-7511. 4.3. For compression test, test pieces conforming to the following shall be used. 4.3.1. Take test pieces from the products of a thickness of 5 mm min. The test pieces shall be rectangular parallelepipeds having one regular square face(length a5 mm) and of a length (LP) of 510a). He
13、re, the length of the marking line shall not exceed . 4.3.2. When using products of a thickness of 5 mm max, the test pieces shall be rectangular parallelepipeds of (805) mm (120.5) mm thickness(mm). 4.3.3. When using cylindric products of a diameter (d) of 5 mm min, the test pieces shall be 510 a)
14、long (LP) and the length of the marking line shall not exceed LP. EDS-T-7510TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST PAGE: 3/6 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology 4.4. For the flex
15、ural test, test pieces of (1272) mm (12.70.5) mm (6.40.2) mm shall be used. And for the detail dimensions are follow EDS-T-7518. 5. NUMBER OF TEST PIECES 5.1. In case of isotropic material, three test pieces shall be tested. 5.2. In case of aeolotropic material, each three test pieces shall be teste
16、d in both horizontal and vertical direction respectively 6. CONDITIONING Unless otherwise specified, test piece should be conditioned at the standard temperature and humidity for 16 hours at least. For a special purpose, keep the test pieces until getting almost constant weight. 7. APPARATUS 7.1. Al
17、l tensile testers and compression testing machines, which are conforming to the requirements of the standard, can be used. 7.2. Such a measuring device that can measure extension or compressibility up to 0.1% with an accuracy of 2% shall be used. 7.3. For the flexural of test pieces, a measuring dev
18、ice which can measure the curve with an accuracy of 0.01 mm shall be used. 7.4. Such a measuring device that can measure the length, width and diameter of test pieces with an accuracy of 0.01 mm shall be used. 7.5. In case of thin specimens, support jigs as shown in Fig. 3 to prevent reflection of t
19、he test piece shall be applied. EDS-T-7510TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST PAGE: 4/6 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology Fig. 2. Support jigs for compression 8. TEST METHOD
20、 8.1. Unless otherwise specified, conduct tests under the standard temperature and humidity condition. Measure the thickness, width and diameter of the test thickness, width and diameter of the test piece at five points along the length of the marking line up to 0.01 mm and calculate the mean values
21、. 8.2. During tensile test, load-extension values are determined at the speed of elongation of 1%/min. This speed means that approximately the grip speed is 1mm/min. 8.3. During compression test, load-deformation values are determined at the speed of compression of 1%/min. So the (speed of the) movi
22、ng cross head shall be regulated to this speed. When mounting the test piece on the support jigs, the upper side of the test piece shall protrude from the jigs and the lower on shall be equal to the surface height of the jigs. Each two parts of the jigs shall be tightened to contact slightly with th
23、e test piece not to interfere in compressing. 8.4. During flexural test, load-deflection values are determined at the speed of extension of 1%/min on the outside layer of the piece. 9. EVALUATION EDS-T-7510TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLE
24、XURAL TEST PAGE: 5/6 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology 9.1. Express the values measured according to 8.1 - 8.3 in dots on the load-deformation graph and draw a straight line which passes through the dots. (See Fig.3) Fig. 3. Example of load-d
25、eformation graph Deformation X means the following. 9.1.1. For tensile test: extension 9.1.2. For compression test: reduced length 9.1.3. For flexural test: deformation 9.2. Elastic modulus can be calculated by the increase of deformation( ) which is equivalent to the inclination of the inclination
26、of the straight line in 9.1., i.e the value of the increase of load( F). The following are the basic formulas. 9.2.1. For tensile and compression tests. E = (Lo / Ao) ( F / X) 9.2.2. For flexural test E = (LV3/ 4bh3) ( F / X) Where, Lo: Initial length of the marking line (Y ) Ao : Sectional area of
27、the test piece ( ) : The deformation of length on the initial straight-line portion of the load-deflection curve. F : The deformation of load on the initial straight-line portion of the load-deflection curve. LV: Distance between the supports (Y ) b : Length of the marking line of the test piece (Y
28、) h : Thickness of the test piece. EDS-T-7510TESTING OF PLASTICS DETERMINATION OF THE MODULUS OF ELASTICITY BY TENSILE, COMPRESSION AND FLEXURAL TEST PAGE: 6/6 ISSUED DATE: 1993. 09. 27 REVISED DATE: 2006. 06. 19 VERSION: 4 GM DAEWOO Auto & Technology 10. CODING SYSTEM Measurement of the tensile /co
29、mpression /flexural elastic modulus of plastics to EDS-T-7510 1000 Kgf/cm2min. Requiremnt Test method Test designation 11. REFERENCE DIN 53457 Testing of plastics determination of the modulus of elasticity by tensile compression and flexural test ASTM D790 Test method for flexural properties of unre
30、inforced and reinforded plastics and electrical insulating materials ASTM D695 Test method for compressive properties of rigid plastics ASTM D638 Test method for tensile properties of plastics EDS-T-7511 Test method for the tensile property of plastics EDS-T-7518 The method determining the flexural strength of plastics
