1、June 2015Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83
2、.080.01!%CZg“2325568www.din.deDDIN EN ISO 899-2Plastics Determination of creep behaviour Part 2: Flexural creep by three-point loading (ISO 899-2:2003 +Amd.1:2015);English version EN ISO 899-2:2003 + A1:2015,English translation of DIN EN ISO 899-2:2015-06Kunststoffe Bestimmung des Kriechverhaltens T
3、eil 2: Zeitstand-Biegeversuch bei Dreipunkt-Belastung (ISO 899-2:2003 + Amd.1:2015);Englische Fassung EN ISO 899-2:2003 + A1:2015,Englische bersetzung von DIN EN ISO 899-2:2015-06Plastiques Dtermination du comportement au fluage Partie 2: Fluage en flexion par mise en charge en trois points (ISO 899
4、-2:2003 +Amd.1:2015);Version anglaise EN ISO 899-2:2003 + A1:2015,Traduction anglaise de DIN EN ISO 899-2:2015-06SupersedesDIN EN ISO 899-2:2003-10www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.2106.15 DIN EN ISO 899-2:2015-06 2 A
5、 comma is used as the decimal marker. National foreword This document (ISO 899-2:2003 + Amd.1:2015) has been prepared by Technical Committee ISO/TC 61 “Plastics” (Secretariat: SAC, China) and has been taken over as EN ISO 899-2:2003 + A1:2015 by Technical Committee CEN/TC 249 “Plastics” (Secretariat
6、: NBN, Belgium). The responsible German body involved in its preparation was the DIN-Normenausschuss Kunststoffe (DIN Standards Committee Plastics), Working Committee NA 054-01-02 AA Mechanische Eigenschaften und Probekrperherstellung. This standard includes Amendment A1 approved by CEN on 14 Februa
7、ry 2015. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all
8、such patent rights. The International Standards referred to in Clause 2 of this standard have been published as the corresponding DIN EN ISO Standards with the same number. Amendments This standard differs from DIN EN ISO 899-2:2003-10 as follows: a) Subclause A.2 “Creep at elevated temperatures” ha
9、s been completely revised; 7.2.5. Previous editions DIN 54852: 1986-09 DIN EN ISO 899-2: 1997-03, 2003-10 b) a number of corrections have been made to the German text in Subclauses 1.6, 4.3, 6.1, 6.2, 6.9 and EN ISO 899-2June 2003 + A1 March 2015 ICS 83.080.01 English VersionPlastics - Determination
10、 of creep behaviour - Part 2:Flexural creep by three-point loading (ISO 899-2:2003 + Amd. 1:2015)Plastiques - Dtermination du comportement au fluage -Partie 2: Fluage en flexion par mise en charge en troispoints (ISO 899-2:2003 + Amd. 1:2015)Kunststoffe - Bestimmung des Kriechverhaltens - Teil 2:Zei
11、tstand-Biegeversuch bei Dreipunkt-Belastung(ISO 899-2:2003 + Amd. 1:2015)EN ISO 899-2:2003 was approved by CEN on 2003-05-23 and Amendment A1:2015 on 2015-02-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
12、 the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, F
13、rench, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar
14、ia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turk
15、ey andUnited Kingdom. Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 899-2:2003 + A1:2015 EEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEUROPEAN COMMITTEE FOR STANDAR
16、DIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGContents Page Foreword to EN ISO 899-2:2003 3 !Foreword to EN ISO 899-2:2003/A1:2015 4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Apparatus .7 5 Test specimens 8 6 Procedure .8 6.1 Conditioning and test atmosphe
17、re 8 6.2 Measurement of test-specimen dimensions and distance between supports 8 6.3 Mounting the test specimens .8 6.4 Selection of stress value .9 6.5 Loading procedure 9 6.5.1 Preloading 9 6.5.2 Loading .9 6.6 Deflection-measurement schedule 9 6.7 Time measurement 9 6.8 Temperature and humidity c
18、ontrol 9 6.9 Measurement of recovery rate (optional) 9 7 Expression of results 10 7.1 Method of calculation 10 7.1.1 Flexural-creep modulus 10 7.1.2 Flexural stress 10 7.1.3 Flexural-creep strain .10 7.2 Presentation of results 11 7.2.1 Creep curves 11 7.2.2 Creep-modulus/time curves .11 7.2.3 lsoch
19、ronous stress-strain curves 12 7.2.4 Three-dimensional representation .12 7.2.5 Creep-to-rupture curves 12 7.3 Precision .13 8 Test report 13 Annex A (informative) Physical-ageing effects on the creep of polymers 14 A.1 General 14 A.2 Creep at elevated temperatures .14 Annex ZA (normative) Normative
20、 references to international publications with their relevant European publications 18 Bibliography 19 EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2:2015-06 2 Foreword to EN ISO 899-2:2003 This document (EN ISO 899-2:2003) has been prepared by Technical Committee ISO/TC 61 “Plastics” in collabora
21、tion with Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2003, and conflicting national standards shal
22、l be withdrawn at the latest by December 2003. This document supersedes EN ISO 899-2:1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finl
23、and, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 899-2:2003 has been approved by CEN as EN ISO 899-2:2003 without any modifications. NOTE N
24、ormative references to International Standards are listed in Annex ZA (normative). EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2:2015-06 3 !Foreword to EN ISO 899-2:2003/A1:2015 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. Thi
25、s Amendment to the European Standard EN ISO 899-2:2003 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2015, and conflicting national standards shall be withdrawn at the latest by September 2015. Attention is
26、drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the foll
27、owing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
28、Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 899-2:2003/Amd 1:2015 has been approved by CEN as EN ISO 899-2:2003/A1:2015 without any modification.“ EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2
29、:2015-06 4 This document (EN ISO 899-2:2003/A1:2015) has been prepared by Technical Committee ISO/TC 61 1 Scope 1.1 This part of ISO 899 specifies a method for determining the flexural creep of plastics in the form of standard test specimens under specified conditions such as those of pretreatment,
30、temperature and humidity. It applies only to a simple freely supported beam loaded at mid-span (three-point-loading test). 1.2 The method is suitable for use with rigid and semi-rigid non-reinforced, filled and fibre-reinforced plastics materials (see ISO 472 for definitions) in the form of dumb-bel
31、l-shaped test specimens moulded directly or machined from sheets or moulded articles. NOTE The method may be unsuitable for certain fibre-reinforced materials due to differences in fibre orientation. 1.3 The method is intended to provide data for engineering-design and research and development purpo
32、ses. Data for engineering-design purposes requires the use of extensometers to measure the gauge length of the specimen. Data for research or quality-control purposes may use the change in distance between the grips (nominal extension). 1.4 Flexural creep may vary significantly with differences in s
33、pecimen preparation and dimensions and in the test environment. The thermal history of the test specimen can also have profound effects on its creep behaviour (see Annex A). Consequently, when precise comparative results are required, these factors must be carefully controlled. 1.5 If flexural-creep
34、 properties are to be used for engineering-design purposes, the plastics materials should be tested over a broad range of stresses, times and environmental conditions. 1.6 The method may not be suitable for determining the flexural creep of rigid cellular plastics (attention is drawn in this respect
35、 to ISO 1209-1, Cellular plastics, rigid Flexural tests Part 1: Bending test , and ISO 1209-2, Cellular plastics, rigid Flexural tests Part 2: Determination of flexural properties). 2 Normative references The following referenced documents are indispensable for the application of this document. For
36、dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 62:1999, Plastics Determination of water absorption ISO 178:2001, Plastics Determination of flexural properties ISO 291:1997, Plastics Stand
37、ard atmospheres for conditioning and testing ISO 472:1999, Plastics Vocabulary EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2:2015-06 5 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 472 and the following apply. 3.1 creep increase in strain with t
38、ime when a constant force is applied 3.2 flexural stress surface stress in the mid-span section of the test specimen NOTE It is calculated from the relationship given in 7.1.2. 3.3 deflection stdistance over which the top or bottom surface of the test specimen at mid-span deviates from its original
39、position during flexure NOTE It is expressed in millimetres. 3.4 flexural-creep strain tstrain at the surface of the test specimen produced by a stress at any given time t during a creep test, calculated in accordance with 7.1.3 NOTE It is expressed as a dimensionless ratio or as a percentage. 3.5 f
40、lexural-creep modulus Etratio of flexural stress to flexural-creep strain, calculated as in 7.1.1 3.6 isochronous stress-strain curve Cartesian plot of stress versus creep strain, at a specific time after application of the test load 3.7 time to rupture period of time the specimen is under full load
41、 until rupture 3.8 creep-strength limit initial stress which will just cause rupture (B,t) or will produce a specified strain (,t) at a specified time t, at a given temperature and relative humidity 3.9 initial distance between specimen supports span L initial distance between lines of contact betwe
42、en test specimen and supports (see Figure 1) EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2:2015-06 6 4 Apparatus 4.1 Test rack, comprising a rigid frame with two supports, one for each end of the test specimen, the distance between the supports being adjustable to (16 1) times the thickness (heig
43、ht) of the specimen (see Figure 1) for normal specimens, or to greater than 17 times the thickness (height) of the specimen or a fixed distance (100 mm) for rigid unidirectional-fibre-reinforced test specimens (see 6.2). The test rack shall be levelled, and sufficient space shall be allowed below th
44、e specimen for the specimen to flex under constant loading at mid-span. Key 1 applied force, F 2 loading edge 3 test specimen 4 support Figure 1 Characteristics of flexural-creep apparatus The radius R1of the loading edge and the radius R2of the supports shall conform to the values given in Table 1.
45、 Table 1 Values in millimetres Thickness of test specimen Radius of loading edge R1Radius of supports R2u 3 3 5 0,1 5 0,1 2 0,2 5 0,2 4.2 Loading system, capable of ensuring that the load is applied smoothly, without causing transient overloading, and that the load is maintained to within 1 % of the
46、 desired load. In creep-to-rupture tests, provision shall be made to prevent any shocks which occur at the moment of rupture being transmitted to adjacent loading systems. The loading mechanism shall allow rapid, smooth and reproducible loading. EN ISO 899-2:2003 + A1:2015 (E) DIN EN ISO 899-2:2015-
47、06 7 4.3 Deflection-measuring device, comprising any contactless or contact device capable of measuring the extension of the specimen under load without influencing the specimen behaviour by mechanical effects (e.g. undesirable deformations, notches), other physical effects (e.g. heating of the spec
48、imen) or chemical effects. The accuracy of the deflection-measuring device shall be within 0,01 % of the final deflection. 4.4 Time-measurement device, accurate to 0,1 %. 4.5 Micrometer, reading to 0,01 mm or closer, for measuring the initial thickness and width of the test specimen. 4.6 Vernier cal
49、lipers, accurate to 0,1 % of the span between the test supports or better, for determining the span. 5 Test specimens Use test specimens of the same shape and dimensions as specified for the determination of flexural properties (see ISO 178). 6 Procedure 6.1 Conditioning and test atmosphere Condition the test specimens as specified in the International Standard for the material under test. In the absence of any information on conditioning, use the most ap
