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1、DRAFT FOR DEVELOPMENT DD CEN/TS 15658:2007 Advanced technical ceramics Mechanical properties of ceramic fibres at high temperature under non-reactive environment Determination of creep behaviour by the hot end method ICS 81.060.30 ? Licensed Copy: London South Bank University, London South Bank Univ
2、ersity, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI DD CEN/TS 15658:2007 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 31 October 2007 BSI 2007 ISBN 978 0 580 58398 8 National foreword This Draft for Development is t
3、he UK implementation 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 pr
4、actical application 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 for its conversion to a European standard. A review of this publication will be initiated not later than 3 yea
5、rs 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 Update Standards. According to the replies received by the end of the review period, the res
6、ponsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road,
7、London W4 4AL. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provision
8、s of a contract. Users are responsible for its correct application. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI TECHNICAL SPECIFICATION SPCIFICATION
9、 TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 15658 September 2007 ICS 81.060.30 English Version Advanced technical ceramics - Mechanical properties of ceramic fibres at high temperature under non-reactive environment - Determination of creep behaviour by the hot end method Cramiques techniques avances
10、 - Proprits mcaniques des fibres cramiques haute temprature sous environnement non ractif - Dtermination du comportement au fluage par la mthode des mors chauds Hochleistungskeramik - Mechanische Eigenschaften von Keramikfasern bei hohen Temperaturen in einer reaktionsfreien Umgebung - Bestimmung de
11、s Kriechverhaltens im Heiverbindungsverfahren This Technical Specification (CEN/TS) was approved by CEN on 20 August 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 their comme
12、nts, particularly on the question whether the CEN/TS can be converted into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep
13、 conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion 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, Ger
14、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUN
15、G Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 15658:2007: E Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00
16、 2007, Uncontrolled Copy, (c) BSI 2 Contents Page Foreword3 1 Scope 4 2 Normative references4 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 heating8 6.6 Temperature measurement.8
17、 6.7 Control of deformation8 6.8 Data recording system8 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 Loading considerations 10 8.4 Testing techn
18、ique10 8.5 Measurements11 8.6 Test validity11 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 rupture12 9.5 Creep rupture time.12 9.6 Creep strain rate curve12 10 Test report13 Bibliography14 CEN/TS 15658:2007 Licen
19、sed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 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
20、. Attention is 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 organizati
21、ons of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Ro
22、mania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 1 Scope This Technical Specification specifies the conditions fo
23、r 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 with the test environment. This Technical Specification applies to cont
24、inuous 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 of this document. For dated references, only the edition cited appli
25、es. 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 filament diameter and cross-section area EN 1007-4, Advanced technical ce
26、ramics 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, General requirements for the competence of testing and calibration labor
27、atories (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, the terms and definitions given in CEN/TR 13233:2007 and the followi
28、ng 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 L0 initial distance between the gripped ends of filament 3.3 test temperature T temperature of the filament in the gauge length 3.4 initial cross
29、section area A0 initial cross section area of the filament within the gauge length CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 3.5 applied tensile force F constant force applied to the f
30、ilament during the test 3.6 applied tensile stress applied tensile force 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 t cr,m time elapsed from the moment when loading is completed until the moment of r
31、upture 3.9 creep strain rate any slippage in the load train as shown by a 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
32、; variation in temperature or in load outside tolerances during the test; initial contraction due to structural changes. CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 12 9 Calculation of res
33、ults 9.1 Creep stress Calculate the applied stress according to the following equation: 0 A F = (1) where is the applied stress, in megapascals (MPa); F is the applied force, in newtons (N); A0 is the initial cross section, in square millimetres (mm2). 9.2 Creep strain at time t On the longitudinal
34、deformation versus time curve, read the longitudinal deformation at time t, L. Calculate the creep strain from the following equation: 0 )(cr L L T = (2) where L is the longitudinal deformation at time t, in millimetres (mm); L0 is the gauge length, in millimetres (mm); T is the temperature, in degr
35、ees 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. 9.6 Creep strain rate curve Plot creep strain rate versus time. NOTE This curve
36、 may help discern between primary, secondary and tertiary creep. CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 13 10 Test report The test report shall be in accordance with the reporting pro
37、visions of EN ISO/IEC 17025 and shall contain at least the following 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. deter
38、mined in accordance with CEN/TS 15658:2007; f) authorising signature; 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 (manufact
39、urer, type, batch, sampling location, date of receipt, etc); j) 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 heat
40、ed zone; n) if applicable, gas or vacuum pressure; o) individual 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
41、 the results, in particular for each tested length the ratio of the number of prepared test specimens to the total number of extracted filaments; r) comments on the test or test results. CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04
42、GMT+00:00 2007, Uncontrolled Copy, (c) BSI 14 Bibliography 1 C. Sauder, J. Lamon, R. Pailler, “Thermomechanical properties of carbon fibres at high temperatures (up to 2000C)”, Composites Science and Technology, 62 (2002) 499-504. 2 EN ISO 7500-1, Metallic materials Verification of static uniaxial t
43、esting machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system (ISO 7500-1:2004) CEN/TS 15658:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank
44、Licensed Copy: London South Bank University, London South Bank University, Wed Oct 17 01:22:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI DD CEN/TS 15658:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing Bri
45、tish Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is
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