1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Plastics - Determination of creep behaviourPart 1: Tensile creep (ISO 899-1:2017)BS EN ISO 899-1:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 899-1 November 2017 ICS 83.080.01 Supersedes EN ISO 899-1:200
2、3English Version Plastics - Determination of creep behaviour - Part 1: Tensile creep (ISO 899-1:2017) Plastiques - Dtermination du comportement au fluage - Partie 1: Fluage en traction (ISO 899-1:2017) Kunststoffe - Bestimmung des Kriechverhaltens - Teil 1: Zeitstand-Zugversuch (ISO 899-1:2017) This
3、 European Standard was approved by CEN on 31 October 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referen
4、ces 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, French, German). A version in any other language made by translation under the responsibility of a CEN m
5、ember 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, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
6、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EU
7、ROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 899-1:2017 ENational forewordThis British Standard is the UK implementation of E
8、N ISO 8991:2017. It is identical to ISO 8991:2017. It supersedes BS EN ISO 8991:2003+A1:2015, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics.A list of organizations represented on this committee can be obtained on request t
9、o its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 97206 5ICS 83.080.01Compliance with a British Stand
10、ard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 8991:2017EUROPEAN STANDARD NORME EURO
11、PENNE EUROPISCHE NORM EN ISO 899-1 November 2017 ICS 83.080.01 Supersedes EN ISO 899-1:2003English Version Plastics - Determination of creep behaviour - Part 1: Tensile creep (ISO 899-1:2017) Plastiques - Dtermination du comportement au fluage - Partie 1: Fluage en traction (ISO 899-1:2017) Kunststo
12、ffe - Bestimmung des Kriechverhaltens - Teil 1: Zeitstand-Zugversuch (ISO 899-1:2017) This European Standard was approved by CEN on 31 October 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status o
13、f 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, French, German
14、). 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, Bulgaria, Croatia,
15、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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey an
16、d United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. N
17、o. EN ISO 899-1:2017 EBS EN ISO 8991:2017EN ISO 899-1:2017 (E) 3 European foreword This document (EN ISO 899-1:2017) has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European St
18、andard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2018, and conflicting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this d
19、ocument may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 899-1:2003. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to im
20、plement 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, Norway, Poland, Portugal, Roman
21、ia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 899-1:2017 has been approved by CEN as EN ISO 899-1:2017 without any modification. BS EN ISO 8991:2017ISO 899-1:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms a
22、nd definitions . 14 Apparatus . 35 Test specimens 46 Procedure. 46.1 Conditioning and test atmosphere 46.2 Measurement of test-specimen dimensions 56.3 Mounting the test specimens 56.4 Selection of stress value 56.5 Loading procedure . 56.5.1 Preloading 56.5.2 Loading . 56.6 Extension-measurement sc
23、hedule . 56.7 Time measurement . 56.8 Temperature and humidity control . 66.9 Measurement of recovery rate (optional) . 67 Expression of results 67.1 Method of calculation 67.1.1 Tensile-creep modulus, Et. 67.1.2 Nominal tensile-creep modulus, E*t67.2 Presentation of results . 77.2.1 Creep curves 77
24、.2.2 Creep-modulus/time curves 77.2.3 Isochronous stress-strain curves . 87.2.4 Three-dimensional representation 87.2.5 Creep-to-rupture curves 87.3 Precision . 98 Test report . 9Annex A (informative) Physical-ageing effects on the creep of polymers .10Bibliography .14 ISO 2017 All rights reserved i
25、iiContents PageBS EN ISO 8991:2017ISO 899-1:2017(E)ForewordISO (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 out through ISO technical committees. Each
26、 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 collaborates closely with the Internationa
27、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different t
28、ypes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
29、e held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is inform
30、ation given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WT
31、O) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.htmlThis document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical behaviour.This third edition cancels and replaces the second edition (ISO 899-1:2003), of wh
32、ich it constitutes a minor revision to update the normative references in Clause 2. It also incorporates the Amendment ISO 899-1:2003/Amd.1:2015.A list of all parts in the ISO 899 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 8991:2017INTERNATIONAL STANDARD ISO 899-
33、1:2017(E)Plastics Determination of creep behaviour Part 1: Tensile creep1 ScopeThis document specifies a method for determining the tensile creep of plastics in the form of standard test specimens under specified conditions such as those of pretreatment, temperature and humidity.The method is suitab
34、le for use with rigid and semi-rigid non-reinforced, filled and fibre-reinforced plastics materials in the form of dumb-bell-shaped test specimens moulded directly or machined from sheets or moulded articles.The method is intended to provide data for engineering-design and research and development p
35、urposes. 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).Tensile creep can vary significantly with differences in spe
36、cimen 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 are intended to be carefully controlled.If tensile-cr
37、eep properties are used for engineering-design purposes, the plastics materials are intended to be tested over a broad range of stresses, times and environmental conditions.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content const
38、itutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 291, Plastics Standard atmospheres for conditioning and testingISO 472, Plastics VocabularyISO 527-
39、1:2012, Plastics Determination of tensile properties Part 1: General principlesISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 472 and t
40、he following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp ISO 2017 All rights reserved 1BS EN ISO 8991:2017ISO 899
41、-1:2017(E)3.1creepincrease in strain with time when a constant force is applied3.2initial stresstensile force per unit area of the initial cross-section within the gauge lengthNote 1 to entry: It is given by the formula =FAwhereF is the force, in newtons;A is the average initial cross-sectional area
42、 within the narrow (gauge) section of the specimen, in square millimetres.Note 2 to entry: It is expressed in megapascals.3.3extension(L)tincrease in the distance between the gauge marks, expressed in millimetres, at time tNote 1 to entry: It is given by the formula()LLLtt=0whereLtis the gauge lengt
43、h, in millimetres, at any given time t during the test;L0is the original gauge length, in millimetres, of the specimen after application of a preload but prior to application of the test load.3.4nominal extension(L*)tincrease in the distance between the grips (increase in grip separation)Note 1 to e
44、ntry: It is given by the formula()LLLtt=0whereL*tis the distance between the grips at any given time t during the test, in millimetres;L*0is the initial distance between the grips, expressed in millimetres, holding the specimen after application of a preload but prior to application of the test load
45、.2 ISO 2017 All rights reservedBS EN ISO 8991:2017ISO 899-1:2017(E)3.5tensile-creep straintchange in the distance between the gauge marks, relative to the initial distance, produced by the applied load at any given time t during a creep testNote 1 to entry: It is given by the formulattLL=()0Note 2 t
46、o entry: It is expressed as a dimensionless ratio or as a percentage.3.6nominal tensile-creep strain*tchange in the distance between the grips, relative to the initial distance, produced by the applied load at any given time t during a creep testNote 1 to entry: It is given by the formula=ttLL()0Not
47、e 2 to entry: It is expressed as a dimensionless ratio or as a percentage.3.7tensile-creep modulusEtratio of initial stress to tensile-creep strain3.8nominal tensile-creep modulusE*tratio of initial stress to nominal tensile-creep strain3.9isochronous stress-strain curveCartesian plot of stress vers
48、us creep strain, at a specific time after application of the test load3.10time to ruptureperiod of time the specimen is under full load until rupture3.11creep-strength limitinitial stress which will just cause rupture ( B,t) or will produce a specified strain (,t) at a specified time t, at a given t
49、emperature and relative humidity3.12recovery from creepdecrease in strain at any given time after completely unloading the specimen, expressed as a percentage of the strain just prior to the removal of the load4 Apparatus4.1 Gripping device, capable of ensuring that the direction of the load applied to the test specimen coincides as closely as possible with the longitudinal axis of the specimen. This ensures that the test ISO 2017 All rights reserved 3BS EN ISO 8991:2017ISO 899-1:2017(E)specimen is sub
