EN ISO 14574-2016 en Fine ceramics (advanced ceramics advanced technical ceramics) - Mechanical properties of ceramic composites at high temperature - Determination of tensile prop.pdf

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1、BS EN ISO 14574:2016Fine ceramics (advanced ceramics, advanced technical ceramics) Mechanical properties of ceramic composites at high temperature Determination of tensile properties(ISO 14574:2013)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 14574:2016

2、BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 14574:2016. The UK participation in its preparation was entrusted to T e c h n i c a l Committee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can be obtained on requ

3、est to 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 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 91168 2 ICS 81.060.30 Compliance with a Briti

4、sh Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2013.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e d31 May 2016 This corrigendum renumbers BS ISO 145

5、74:2013as BS EN ISO 14574:2016It is identical to ISO 14574:2013. It supersedes BS EN 1892:2005,BS EN 1893:2005 and BS ISO 14574:2013 which are withdrawn.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14574 April 2016 ICS 81.060.30 Supersedes EN 1892:2005, EN 1893:2005English Version Fine c

6、eramics (advanced ceramics, advanced technical ceramics) - Mechanical properties of ceramic composites at high temperature - Determination of tensile properties (ISO 14574:2013) Cramiques techniques - Proprits mcaniques des cramiques composites haute temprature - Dtermination des caractristiques en

7、traction (ISO 14574:2013) Hochleistungskeramik - Mechanische Eigenschaften von keramischen Verbundwerkstoffen bei hoher Temperatur - Bestimmung der Eigenschaften unter Zug (ISO 14574:2013) This European Standard was approved by CEN on 25 March 2016. CEN members are bound to comply with the CEN/CENEL

8、EC 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 references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or

9、 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 member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the offi

10、cial versions. CEN members are the national standards bodies of 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,

11、 Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of e

12、xploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14574:2016 EEN ISO 14574:2016 (E) European foreword The text of ISO 14574:2013 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” of the International Organization for Standardizati

13、on (ISO) and has been taken over as EN ISO 14574:2016 by Technical Committee CEN/TC 184 “Advanced technical ceramics” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the

14、 latest by October 2016, and conflicting national standards shall be withdrawn at the latest by October 2016. 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

15、all such patent rights. This document supersedes EN 1892:2005, EN 1893:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,

16、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, Turkey and the United Kingdom. Endorsemen

17、t notice The text of ISO 14574:2013 has been approved by CEN as EN ISO 14574:2016 without any modification. BS EN ISO 14574:2016iiISO 14574:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms, definitions and symbols 14 Principle 45 Apparatus .

18、45.1 Test machine . 45.2 Load train. 45.3 Test chamber 45.4 Set-up for heating . 55.5 Extensometer . 55.6 Temperature measurement devices . 55.7 Data recording system 55.8 Micrometers 66 Test specimens 66.1 General . 66.2 Test specimens commonly used . 67 Test specimen preparation .107.1 Machining a

19、nd preparation . 107.2 Number of tests of specimens . 108 Test procedures 118.1 Test set-up: Temperature considerations . 118.2 Test set-up: Other considerations . 118.3 Testing technique . 128.4 Test validity . 139 Calculation of results 139.1 Test specimen origin . 139.2 Tensile strength . 139.3 S

20、train at maximum tensile force . 139.4 Proportionality ratio or Pseudo-elastic modulus, elastic modulus 1410 Test report 15Annex A (informative) Test specimen for use with optical extensometry .16Bibliography .17BS EN ISO 14574:2016ISO 14574:2013(E)ForewordISO (the International Organization for Sta

21、ndardization) 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 member body interested in a subject for which a technical committee has been established has the righ

22、t 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International S

23、tandards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I

24、nternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 14574

25、 was prepared by Technical Committee ISO/TC 206, Fine ceramics.iv ISO 2013 All rights reservedBS EN ISO 14574:2016INTERNATIONAL STANDARD ISO 14574:2013(E)Fine ceramics (advanced ceramics, advanced technical ceramics) - Mechanical properties of ceramic composites at high temperature - Determination o

26、f tensile properties1 ScopeThis International Standard specifies the conditions for determination of tensile properties of ceramic matrix composite materials with continuous fibre reinforcement for temperatures up to 2 000 C.NOTE 1 In most cases, ceramic matrix composites to be used at high temperat

27、ure in air are coated with an antioxidation coating.NOTE 2 The purpose of this International Standard is to determine the tensile properties of a material when it is placed under an oxidizing environment but not to measure material oxidation.This International Standard applies to all ceramic matrix

28、composites with a continuous fibre reinforcement, unidirectional (1D), bi-directional (2D), and tri-directional (xD, with 2 2 mm 0,2 mm, angle 10to 30 -b, width of the calibrated length 8 mm to 20 mm 0,2 mmR, radius 30 mm 2 mmParallelism of machined parts 0,05 -Figure 2 Type 2 test specimenTable 2 R

29、ecommended dimensions for a Type 2 test specimenDimensions in millimetresParameter xD Tolerancel, calibrated length 30 to 80 0,51, diameter in calibrated length 8 to 20 0,22, diameter 2= 1( = 1,2 to 2) 0,23, diameter 3= 2( = 1,2 to 2) 0,2R, radius 30 2Parallelism of machined parts 0,05 - ISO 2013 Al

30、l rights reserved 7BS EN ISO 14574:2016ISO 14574:2013(E)Figure 3 Type 3 test specimenTable 3 Recommended dimensions for a Type 3 test specimenParameter xD Tolerancel, calibrated length 30 mm to 80 mm 0,5 mmb, width and thickness in the calibrated length 3 mm to 8 mm 0,2 mm, angle 7 to 30 2Parallelis

31、m of machined parts 0,05 mm -Figure 4 Type 4 test specimen8 ISO 2013 All rights reservedBS EN ISO 14574:2016ISO 14574:2013(E)Table 4 Recommended dimensions for a Type 4 test specimenDimensions in millimetresParameter 2D and xD Tolerancel, calibrated length 30 to 80 0,5h, thickness 2 0,2b1, width in

32、the calibrated length 8 to 20 0,2b2, width b2=b1with = 1,2 to 2 0,2R, radius 30 2Parallelism of machined parts 0,05 -Variation of material properties with temperature may lead to a multi-section test specimen (Type 5) as represented in Figure 5. Recommended dimensions are given in Table 5.Figure 5 T

33、ype 5 test specimenTable 5 Recommended dimensions for a Type 5 test specimenDimensions in millimetresParameter 2D and xD Tolerancel, calibrated length 30 to 80 0,5h, thickness 2 0,2b1, width in the calibrated length 8 to 20 0,2b2, width b2=b1with = 1,2 to 2 0,2b3, width b3=b2with = 1,2 to 2 0,2R, ra

34、dius 30 2Parallelism of machined parts 0,05 -NOTE 1 When used with cooled grips, this multi-section specimen allows rupture in the controlled temperature zone. ISO 2013 All rights reserved 9BS EN ISO 14574:2016ISO 14574:2013(E)Figure 6 Type 6 test specimenNOTE 2 This test specimen is easy to machine

35、 and its use allows mainly the determination of modulus, as rupture may not happen all the time in the controlled temperature zone; it should not be used for strength measurement.NOTE 3 This kind of specimen cannot be used for cold gripping systems.Table 6 Recommended dimensions for a Type 6 test sp

36、ecimenDimensions in millimetresParameter 1D, 2D and xD Toleranceh, thickness 2 0,2b, width 8 to 20 0,2Parallelism of machined parts 0,05 -7 Test specimen preparation7.1 Machining and preparationDuring cutting out, care shall be taken to align the test specimen axis with the desired fibre-related loa

37、ding axis.Machining methods that do not cause damage to material are recommended. Machining parameters should be traceable.These parameters shall be adhered to during test specimen preparation.NOTE 1 When specimens are machined from a plate that has been protected against oxidation, the cut surfaces

38、 of the specimen are unprotected. These surfaces should be protected to prevent possible oxidation.NOTE 2 When a cooled gripping system is used, the surface of the part of specimen that is at a temperature between the test temperature and the grips temperature may need appropriate anti-oxidant prote

39、ction.7.2 Number of tests of specimensAt least five valid test results, as specified in 8.4, are required for any condition.10 ISO 2013 All rights reservedBS EN ISO 14574:2016ISO 14574:2013(E)8 Test procedures8.1 Test set-up: Temperature considerations8.1.1 GeneralThe following determinations shall

40、be carried out under conditions representative of the tests, and shall be repeated every time there is a change, e.g. in material, in specimen geometry, in gripping configuration. In establishing them, time shall be allowed for temperature stabilization.8.1.2 Controlled temperature zonePrior to test

41、ing, the temperature gradient within the calibrated length inside the furnace shall be established over the temperature range of interest. This shall be done by measuring the specimen temperature at a minimum of three locations, which shall be the extensometer reference points and midway between the

42、 two.To establish the length of the controlled temperature zone, it is necessary to measure temperature also outside the gauge length. The temperature variation in the gauge length shall be within 20 C at test temperature. The temperature variation in the part of the calibrated length, including the

43、 gauge length, shall be within 50 C of the test temperature.Temperatures shall be measured in accordance with 5.5. If thermocouples are used to measure the temperature at different locations of the specimen, they shall be embedded (and sealed if necessary) into a dummy specimen to a depth approximat

44、ely equal to half the specimen dimension in the direction of insertion.8.1.3 Temperature calibrationDuring a series of tests, the test temperature may be determined either directly by measurement on the specimen itself, or indirectly from the temperature indicated by the temperature control device.I

45、n the latter case, calibration will be necessary. The relationship between the control temperature and test specimen temperature at the centre of the gauge length shall be established beforehand on a dummy test specimen over the range of temperature of interest.NOTE The relationship between the temp

46、erature indicated by the temperature control system and the test temperature is usually established simultaneously with the controlled temperature zone.8.2 Test set-up: Other considerations8.2.1 Displacement rateA displacement rate that allows specimen rupture within 1 min shall be used. The displac

47、ement rate and the loading mode shall be reported. If the material to be tested is sensitive to creep at the temperature of test, the speed shall be significantly increased but impact loading shall be avoided.8.2.2 Measurement of test specimens dimensionsThe cross-section area is determined at the c

48、entre of the specimen and at each end of the gauge length.The cross-section area varies with temperature and the variation is very difficult to measure, for this reason, cross-section area is measured at room temperature.Dimensions shall be measured to an accuracy of 0,01 mm. The arithmetic means of

49、 the measurements shall be used for calculations.If the test specimen is equipped with marks, the gauge length measured at room temperature, shall be known with an accuracy of 1 %. If thermal expansion between room temperature and the test ISO 2013 All rights reserved 11BS EN ISO 14574:2016ISO 14574:2013(E)temperature is less than the tolerance on the gauge length measurement, then the gauge length may be measured at room temperature. If this