BS DD CEN TS 15658-2007 Advanced technical ceramics - Mechanical properties of ceramic fibres at high temperature under non-reactive environment - Determination of creep behaviour .pdf

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2、ot end methodICS 81.060.30Advanced technical ceramics Mechanical properties of ceramic DRAFT FOR DEVELOPMENTDD CEN/TS 15658:2007DD CEN/TS 15658:2007This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 31 October 2007 BSI 2007ISBN 978 0 580 58

3、398 8or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.A list of org

4、anizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Amendments issued since publicationAmd. No. Date Commentsfor its conversion

5、to a European standard. A review of this publication will be initiated not later than 3 years after its publication by the European organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of U

6、pdate Standards.According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification National forewordThis Draft for Development is the UK implementat

7、ion of CEN/TS 15658:2007.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application

8、 can be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible TECHNICAL SPECIFICATIONSPCIFICATION TECHNIQUETECHNISCHE SPEZIFIKATIONCEN/TS 15658September 2007ICS 81.060.30English VersionAdvance

9、d technical ceramics - Mechanical properties of ceramicfibres at high temperature under non-reactive environment -Determination of creep behaviour by the hot end methodCramiques techniques avances - Proprits mcaniquesdes fibres cramiques haute temprature sousenvironnement non ractif - Dtermination d

10、ucomportement au fluage par la mthode des mors chaudsHochleistungskeramik - Mechanische Eigenschaften vonKeramikfasern bei hohen Temperaturen in einerreaktionsfreien Umgebung - Bestimmung desKriechverhaltens im HeiverbindungsverfahrenThis Technical Specification (CEN/TS) was approved by CEN on 20 Au

11、gust 2007 for provisional application.The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit theircomments, particularly on the question whether the CEN/TS can be converted into a European Standard.CEN members are req

12、uired to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS availablepromptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)until the final decision about the possible conv

13、ersion of the CEN/TS into an EN is reached.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Port

14、ugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means re

15、servedworldwide for CEN national Members.Ref. No. CEN/TS 15658:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle7 5 Significance and use .7 6 Apparatus .7 6.1 Test installations7 6.2 Load train7 6.3 Adhesive .7 6.4 Test chamber8 6.5 Set-up for

16、 heating 8 6.6 Temperature measurement.8 6.7 Control of deformation8 6.8 Data recording system 8 7 Test specimens8 7.1 General8 7.2 Test specimen preparation.8 7.3 Number of test specimens9 8 Test Procedure.9 8.1 Determination of the temperature profile9 8.2 Test set-up: other considerations9 8.3 Lo

17、ading considerations 10 8.4 Testing technique 10 8.5 Measurements11 8.6 Test validity 11 9 Calculation of results 12 9.1 Creep stress .12 9.2 Creep strain at time t .12 9.3 Drawing of the creep curve.12 9.4 Creep strain at rupture 12 9.5 Creep rupture time.12 9.6 Creep strain rate curve12 10 Test re

18、port 13 Bibliography 14 CEN/TS 15658:20073 Foreword This document (CEN/TS 15658:2007) has been prepared by Technical Committee CEN/TC 184 “Advanced technical ceramics”, the secretariat of which is held by BSI. Attention is drawn to the possibility that some of the elements of this document may be th

19、e 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 following countries are bound to announce this Technical Specification: Austria,

20、Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TS 15658:2

21、0074 1 Scope This Technical Specification specifies the conditions for the determination of the tensile creep deformation and failure behaviour of single filaments of ceramic fibres at high temperature and under test conditions that prevent changes to the material as a result of chemical reaction wi

22、th the test environment. This Technical Specification applies to continuous ceramic filaments taken from tows, yarns, braids and knitted structures, that have strains to failure less than or equal to 5 %. 2 Normative references The following referenced documents are indispensable for the application

23、 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. EN 1007-3, Advanced technical ceramics Ceramic composites Methods of test for reinforcement Part 3: Determination of fila

24、ment diameter and cross-section area EN 1007-4, Advanced technical ceramics Ceramic composites Methods of test for reinforcement Part 4: Determination of tensile properties of filaments at ambient temperature CEN/TR 13233:2007 , Advanced technical ceramics Notations and symbols EN ISO/IEC 17025, Gen

25、eral requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2005) EN 60584-1, Thermocouples Part 1: Reference tables (IEC 60584-1:1995) EN 60584-2, Thermocouples Part 2: Tolerances (IEC 60584-2:1982 + A1:1989) 3 Terms and definitions For the purposes of this document,

26、 the terms and definitions given in CEN/TR 13233:2007 and the following apply. 3.1 creep time-dependent increase of gauge length starting from the time when the constant specified level of force is reached 3.2 gauge length L0initial distance between the gripped ends of filament 3.3 test temperature

27、T temperature of the filament in the gauge length 3.4 initial cross section area A0initial cross section area of the filament within the gauge length CEN/TS 15658:20075 3.5 applied tensile force F constant force applied to the filament during the test 3.6 applied tensile stress applied tensile force

28、 divided by the initial cross sectional area 3.7 longitudinal deformation L change of the gauge length L0 caused by creep 3.8 creep rupture time tcr,mtime elapsed from the moment when loading is completed until the moment of rupture 3.9 creep strain rate any slippage in the load train as shown by a

29、drop in the force/displacement curve, before reaching the maximum tensile force; change in atmosphere around the specimen; failure exactly at the grip(s) invalidates only the determination of the strength and strain to failure; variation in temperature or in load outside tolerances during the test;

30、initial contraction due to structural changes. CEN/TS 15658:200712 9 Calculation of results 9.1 Creep stress Calculate the applied stress according to the following equation: 0AF= (1) where is the applied stress, in megapascals (MPa); F is the applied force, in newtons (N); A0 is the initial cross s

31、ection, in square millimetres (mm2). 9.2 Creep strain at time t On the longitudinal deformation versus time curve, read the longitudinal deformation at time t, L. Calculate the creep strain from the following equation: 0)(crLLT= (2) where Lis the longitudinal deformation at time t, in millimetres (m

32、m); L0is the gauge length, in millimetres (mm); T is the temperature, in degrees centigrade (C). 9.3 Drawing of the creep curve Plot the curve cr(T) versus time. 9.4 Creep strain at rupture Read creep strain at rupture from the curve. 9.5 Creep rupture time Read creep rupture time from the curve. 9.

33、6 Creep strain rate curve Plot creep strain rate versus time. NOTE This curve may help discern between primary, secondary and tertiary creep. CEN/TS 15658:200713 10 Test report The test report shall be in accordance with the reporting provisions of EN ISO/IEC 17025 and shall contain at least the fol

34、lowing information: a) name and address of the testing establishment; b) date of test; c) on each page, a unique report identification and page number; d) customer name and address; e) reference to this Technical Specification, i.e. determined in accordance with CEN/TS 15658:2007; f) authorising sig

35、nature; g) any deviation from the method described, with appropriate validation, i.e. demonstrated to be acceptable to the parties involved; h) description of the equipment used; i) complete identification of the tested filament (manufacturer, type, batch, sampling location, date of receipt, etc); j

36、) method employed for determination of the filament initial cross section area; k) for each test specimen, the gauge length, expressed in millimetre; l) heating rate, test temperature and displacement rate; m) length of the uniformly heated zone; n) if applicable, gas or vacuum pressure; o) individu

37、al values and average value of tensile strength and where applicable of fracture strain; p) number of tests carried out and the number of valid results obtained; q) details of any aspect of the experimental procedure which might influence the results, in particular for each tested length the ratio o

38、f the number of prepared test specimens to the total number of extracted filaments; r) comments on the test or test results. CEN/TS 15658:200714 Bibliography 1 C. Sauder, J. Lamon, R. Pailler, “Thermomechanical properties of carbon fibres at high temperatures (up to 2000C)”, Composites Science and T

39、echnology, 62 (2002) 499-504. 2 EN ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system (ISO 7500-1:2004) CEN/TS 15658:2007blankDD CEN/TS BSI389 Chiswick High RoadLondon

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