《ISO-3386-2-1997.pdf》由会员分享，可在线阅读，更多相关《ISO-3386-2-1997.pdf（8页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD IS0 3386-2 Second edition 1997-06-I 5 Flexible cellular polymeric materials - Determination of stress-strain characteristics in compression - Part 2: High-density materials Ma tbriaux polymtkes alv6olaires souples - Dbtermina tion de la caractbristique de contrainte-dkformatio
2、n relative en compression - Partie 2: Matkriaux a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii INTERNATIONAL STANDARD IS0 IS0 3386-2: 1997(E) Flexible cellular polymeric materials - Determination of stress-strain characteristics in compression - Part 2: High-density materials 1 Scope
3、This part of IS0 3386 specifies a method for the determination of the compression stress-strain characteristics of flexible cellular polymeric materials of density greater 250 kg/m3. than The compression stress-strain characteristic is a measure of the load-bearing properties of the material, though
4、 not necessarily of its capacity to sustain a long-term load. The compression stress-strain characteristic differs from the indentation hardness characteristics (as determined in accordance with IS0 2439) which are known to be influenced by the thickness and the tensile properties of the flexible ce
5、llular material under test, the shape of the compression piate, and the shape and size of the test piece. IS0 3386-l specifies a method for low-density flexible materials, and differs from Part 2 in the following ways: Part 1 is concerned with materials of density up to 250 kg/m, whilst Part 2 is ma
6、inly concerned with materials of density above 250 kg/m3; compression stress values have been deleted from Part 2; Part 2 does not allow the use of a cylindrical test piece. This part of IS0 3386 is a general method for testing denser flexible cellular materials (i.e. expanded cellular rubbers), mea
7、surements being made on one of more points on the steeply rising part of the stress-strain curve. The shape factor of the test piece is important and comparative test results can only be obtained on test pieces having the same shape factor. NOTE 1 For comparison purposes, the method may be used for
8、material of 150 kg/m3 density or greater. 1 -,-,- IS0 3386-2: 1997(E) IS0 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All
9、standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards.
10、 IS0 1923: 1981, Cellular plastics and rubbers - Determination of linear dimensions. IS0 2439:-J, Flexible cellular polymeric materials - Determination of hardness (indentation technique). 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 compression
11、 stress-strain characteristic (CC): The stress, expressed in kilopascals, required to produce a compression, at a constant rate of deformation during the fourth loading cycle of the test specified in this International Standard, expressed as a function of the compression. NQTE 2 Stresses are usuaily
12、 quoted at compressions of (25 k 1) %, (40 f: I) %, (50 =f= 1) % and (65 =t 1) %, being designated CC25, CC40, CC50 and CC65 respectively. 3.2 shape factor: The ratio of the area of one applied force bearing face of the test piece to the sum of the areas of the four perpendicular sides of the test p
13、iece. 4 Apparatus The apparatus comprises a test machine capable of compressing the test piece by means of a compression plate moving at a uniform rate of (5 or b) a temperature of 27 “C f: 2 “C and a relative humidity of (65 F is the force, in newtons, at the specified strain; A is the area, in squ
14、are millimetres, of the test piece. 8 Repeat tests For repeat tests on the same test piece, a minimum recovery period of 16 h shall be observed. 4 -,-,- IS0 IS0 3386-2:1997( E) 9 Test report The test report shall include the following information: a) reference to this International Standard; b) a de
15、scription of the material; c) the temperature and humidity at which the test piece was conditioned; d) the dimensions of the test piece used and (if applicable) the number of plies; e) the compression stress-strain characteristics for individual test pieces and their median, and/or the compression s
16、tress-strain values for individual test pieces and their median; f) other relevant information. NOTE 4 An example of how to express the compression stress-strain characteristics briefly is as follows IS0 3386-2 CC& 23 C/50 % relative humidity (individual results) median kPa -,-,- ISO/FDIS 3386-2: 1997(E) IS0 ICS 83.100 Descriptors: cellular materials, cellular plastics, foam rubber, flexible cellular materials, tests, compression tests, determination, compressive stress. Price based on 5 pages -,-,-