ISO 1209-2-2007 Rigid cellular plastics - Determination of flexural properties - Part 2 Determination of flexural strength and apparent flexural modulus of elas.pdf

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1、INTERNATIONAL STANDARD ISO 1209-2 Third edition 2007-05-01 Reference number ISO 1209-2:2007(E) ISO 2007 Rigid cellular plastics Determination of flexural properties Part 2: Determination of flexural strength and apparent flexural modulus of elasticity Plastiques alvolaires rigides Dtermination des p

2、roprits de flexion Partie 2: Dtermination de la rsistance la flexion et du module apparent dlasticit en flexionISO 1209-2:2007(E) ii ISO 2007 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewe

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7、 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandISO 1209-2:2007(E) ISO 2007 All rights reserved iii Contents Page 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus . 1 5 Test specimens 2 6 Conditioning and test conditions . 3 7 Procedure . 3 8 Expression of r

8、esults 4 9 Precision . 5 10 Test report 5ISO 1209-2:2007(E) iv ISO 2007 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried

9、out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO

10、collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Internationa

11、l Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the eleme

12、nts of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 1209-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics. This third edition cancels and replaces the second edi

13、tion (ISO 1209-2:2004), which has been technically revised. ISO 1209 consists of the following parts, under the general title Rigid cellular plastics Determination of flexural properties: Part 1: Basic bending test Part 2: Determination of flexural strength and apparent flexural modulus of elasticit

14、yINTERNATIONAL STANDARD ISO 1209-2:2007(E) ISO 2007 All rights reserved 1 Rigid cellular plastics Determination of flexural properties Part 2: Determination of flexural strength and apparent flexural modulus of elasticity 1S c o p e This part of ISO 1209 specifies a method for determining the flexur

15、al strength and the apparent flexural modulus of elasticity of rigid cellular plastics. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition o

16、f the referenced document (including any amendments) applies. ISO 1923, Cellular plastics and rubbers Determination of linear dimensions 3 Principle A load is applied at a uniform rate by means of a loading edge to a test specimen supported at two positions. The load is applied perpendicularly to th

17、e specimen at a position midway between the supporting positions (see Figure 1). The load/deformation curve is recorded. From the curve, the flexural strength and the apparent flexural modulus of elasticity are calculated. 4 Apparatus 4.1 Test machine, consisting of a universal mechanical-testing ma

18、chine capable of operating at a constant rate of movement of the moveable head. The range of the test machine shall be such that the applied load can be measured with an accuracy of . The machine shall include a device for simultaneous recording of force and the corresponding deformation. 4.2 Test s

19、pecimen support, consisting of two parallel cylindrical support edges set in the same horizontal plane, each having an edge radius of . The length of the support edges shall be greater than the width of the test specimens. The span between the support edges shall be adjustable in the range to . The

20、recommended span is . 4.3 Test specimen loading edge, having the same shape and dimensions as the support edges. The loading edge shall be located midway between and parallel to the support edges. 4.4 Dial-gauge micrometer, as described in ISO 1923. 1% (15 1) mm L 200 mm 450 mm 300 mmISO 1209-2:2007

21、(E) 2 ISO 2007 All rights reserved 5 Test specimens 5.1 Shape and dimensions Each test specimen shall be a rectangular parallelepiped having the dimensions given, together with the corresponding values of the span between the support edges, in Table 1. 5.2 Preparation Test specimens shall be cut wit

22、hout deformation of the original cell structure. The test specimens may have a skin on one or more sides. If so, this fact shall be recorded. Key 1 loading edge with cylindrical edge having a radius of 2 support edges with cylindrical edge having a radius of 3 test specimen distance between support

23、edges test specimen length test specimen thickness applied force Figure 1 Side view of test specimen and support edges Table 1 Dimension Recommended value Limit(s) on value mm mm Length 350 Width Thickness 25 15 to 38 Span 300 to NOTE At high thickness values, it will be necessary to select a span v

24、alue at the low end of the range to in view of the limits on the adjustment of the span (see 4.2, second paragraph). Conversely, at low thickness values, it will be necessary to select a span value at the high end of the range to . (15 1) mm (15 1) mm L l d F L (L + 50) b 4d 2d d L 12d 16d 12d 16d 1

25、2d 16dISO 1209-2:2007(E) ISO 2007 All rights reserved 3 5.3 Number At least five specimens shall be tested for each sample. When testing materials which are suspected of being anisotropic, duplicate sets of test specimens shall be prepared having axes respectively parallel to and normal to the suspe

26、cted direction of anisotropy. When testing specimens with only one surface skin, unless otherwise specified, duplicate sets of test specimens shall be tested, one set with the skin in tension and one set with the skin in compression. Report the results separately. 6 Conditioning and test conditions

27、Condition the test specimens for a minimum of at the conditions under which testing will be carried out. Normal test conditions areand R.H.;and R.H.;and R.H. Temperatures of , , , and are preferred alternative temperatures, although other conditions may be used, for example those reflecting end use.

28、 7 Procedure Determine the dimensions of the test specimens in accordance with ISO 1923. Place a test specimen symmetrically upon the support edges and apply an increasing force perpendicular to the longitudinal axis of the specimen by moving the loading edge at a constant speed of:for the determina

29、tion of the apparent flexural modulus; either or for the determination of other flexural properties. Record the force/deformation curve and draw a line tangential to the steepest part of the curve (see Figure 2). Record the breaking load when the break occurs before deflection is reached. It is norm

30、ally not necessary to continue the test beyond a flexural strain of . NOTE With the recommended test specimen and loading arrangement, the strain is at when the deflection reaches . Inspect the test specimen for any sign of crushing. If any crushing is found, disregard the flexural strength value. 6

31、h (23 2) C (50 10) % (23 5) C 50 +20 10 % (27 5) C 65 +20 10 % 196 C 70 C 10 C 0 C 40 C (20 1) mm/min (20 1) mm/min (100 10) mm/min 5% 5% 5% 30 mmISO 1209-2:2007(E) 4 ISO 2007 All rights reserved 8 Expression of results 8.1 The flexural strength is given, in kilopascals, by the equation: where is th

32、e maximum force applied, in kilonewtons; is the span between the support edges, in millimetres; is the test specimen width, in millimetres; is the test specimen thickness, in millimetres. 8.2 The apparent flexural modulus of elasticity is given, in kilopascals, by the equation: Key X deflection (mm)

33、 Yf o r c e ( k N ) 1 tangent 2 break Figure 2 Typical force/deformation diagram R R = 1,5F R L bd 2 10 6 F R L b d E E = L 3 4bd 3 F t x t 10 6ISO 1209-2:2007(E) ISO 2007 All rights reserved 5 where is the force, in kilonewtons, corresponding to the deflection (see Figure 2); is the corresponding d

34、eflection, in millimetres; , and are as defined in 8.1. 9P r e c i s i o n An interlaboratory test was performed with 10laboratories in 1993. Four products with different flexural characteristics were tested, three of which were used for statistical evaluation of the reproducibility (two test result

35、s for each product) while one product was used for statistical evaluation of the repeatability (five test results). The results, analysed in accordance with ISO 5725:1986, Precision of test methods Determination of repeatability and reproducibility for a standard test method by inter-laboratory test

36、s (now withdrawn), are given in Table 1. 10 Test report The test report shall include the following information: a) a reference to this part of ISO 1209; b) a description and identification of the material; c) the presence or absence of skins or facings on the test specimens and, if applicable, on w

37、hich faces; d) the conditioning procedure used; e) the dimensions of the test specimens; f) the span between the support edges and the speed of the loading edge; g) the test conditions (temperature, humidity); h) the direction of application of the force with respect to any anisotropy; i) the indivi

38、dual values of the flexural strength, in kilopascals; j) the individual values of the apparent flexural modulus of elasticity, in kilopascals; k) the individual values of the breaking load, where applicable, in newtons; l) the arithmetic mean of the flexural strength values; m) the arithmetic mean o

39、f the flexural modulus of elasticity values; n) the arithmetic mean of the breaking load values, where applicable; o) details of any deviation from this part of ISO 1209, and of any incident that may have influenced the results; p) the date of the test. Table 2 Results of interlaboratory testing Flexural strength/apparent modulus of elasticity Repeatability limit Reproducibility limit ( confidence level) ( confidence level) Approximately Approximately F t x t x t L b d 95 % 95 % 5% 15 %ISO 1209-2:2007(E) ICS 83.100 Price based on 5 pages ISO 2007 All rights reserved