BS ISO 15733-2015 Fine ceramics (advanced ceramics advanced technical ceramics) Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure Deter.pdf

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1、BSI Standards PublicationBS ISO 15733:2015Fine ceramics (advancedceramics, advanced technicalceramics) Mechanicalproperties of ceramiccomposites at ambienttemperature in air atmosphericpressure Determination oftensile propertiesBS ISO 15733:2015 BRITISH STANDARDNational forewordThis British Standard

2、 is the UK implementation of ISO 15733:2015.The UK participation in its preparation was entrusted to TechnicalCommittee RPI/13, Advanced technical ceramics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include al

3、l the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79295 3ICS 81.060.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Sta

4、ndard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2015.Amendments issued since publicationDate Text affectedBS ISO 15733:2015 ISO 2015Fine ceramics (advanced ceramics, advanced technical ceramics) Mechanical properties of ceramic composites at ambient

5、 temperature in air atmospheric pressure Determination of tensile propertiesCramiques techniques Proprits mcaniques des cramiques composites temprature ambiante sous air pression atmosphrique Dtermination des proprits en tractionINTERNATIONAL STANDARDISO15733Second edition2015-08-01Reference numberI

6、SO 15733:2015(E)BS ISO 15733:2015ISO 15733:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic

7、 or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Gen

8、eva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 15733:2015ISO 15733:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms, definitions and symbols 14 Principle 35 Apparatus . 35.1 Test machine . 35.2 Load train. 35.3 Extensometer . 35.4 Data recordin

9、g system 45.5 Micrometers 46 Test specimens 47 Test specimen preparation 77.1 Machining and preparation 77.2 Number of test of specimens 88 Test procedures . 88.1 Test set-up: other considerations . 88.1.1 Displacement rate . 88.1.2 Measurement of test specimens dimensions 88.2 Testing technique 88.

10、2.1 Specimen mounting. 88.2.2 Setting of extensometer . 88.2.3 Measurements 88.3 Test validity 89 Calculation of results . 99.1 Test specimen origin 99.2 Tensile strength 99.3 Strain at maximum tensile force 99.4 Proportionality ratio or pseudo-elastic modulus, elastic modulus . 910 Test report 10Bi

11、bliography .12 ISO 2015 All rights reserved iiiContents PageBS ISO 15733:2015ISO 15733:2015(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

12、 out through ISO technical committees. Each 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

13、 collaborates closely with the International 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 a

14、pproval criteria needed for the different types 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 th

15、e subject of patent rights. ISO shall not be 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

16、 trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in th

17、e Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 206, Fine ceramics.This second edition cancels and replaces the first edition (ISO 15733:2001), which has been technically revised.iv ISO 2015 All righ

18、ts reservedBS ISO 15733:2015INTERNATIONAL STANDARD ISO 15733:2015(E)Fine ceramics (advanced ceramics, advanced technical ceramics) Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure Determination of tensile properties1 ScopeThis International Standard spec

19、ifies the conditions for determination of tensile properties of ceramic matrix composite materials with continuous fibre reinforcement at room temperatures. This International Standard applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1D), bi-directional

20、 (2D), and tri-directional (xD, with 2 x 3), loaded along one principal axis of reinforcement.NOTE In most cases, ceramic matrix composites to be used at high temperature in air are coated with an antioxidation coating.2 Normative referencesThe following documents, in whole or in part, are normative

21、ly referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 3611, Geometrical product specifications (GPS) Dimensional meas

22、uring equipment: Micrometers for external measurements Design and metrological characteristicsISO 7500-1:2004, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system3 Terms, definitio

23、ns and symbolsFor the purposes of this document, the following terms and definitions apply.3.1calibrated lengthlpart of the test specimen that has uniform and minimum cross-section area3.2gauge lengthLoinitial distance between reference points on the test specimen in the calibrated length3.3initial

24、cross-section areaSoinitial cross-section area of the test specimen within the calibrated length3.4effective cross-section areaSo efftotal area corrected by a factor, to account for the presence of a coating ISO 2015 All rights reserved 1BS ISO 15733:2015ISO 15733:2015(E)3.5longitudinal deformationA

25、increase in the gauge length between reference points under a tensile force3.6longitudinal deformation under maximum tensile forceAmincrease in the gauge length between reference points under maximum tensile force3.7tensile strainrelative change in the gauge length defined as the ratio A/Lo3.8tensil

26、e strain under maximum forcemrelative change in the gauge length defined as the ratio Am/Lo3.9tensile stresstensile force supported by the test specimen at any time in the test divided by the initial cross-section area (So)3.10effective tensile stressefftensile force supported by the test specimen a

27、t any time in the test divided by the effective cross-section area (So eff)3.11maximum tensile forceFmhighest recorded tensile force in a tensile test on the test specimen when tested to failure3.12tensile strengthmratio of the maximum tensile force to the initial cross-section area (So)3.13effectiv

28、e tensile strengthm effratio of the maximum tensile force to the effective cross-section area3.14proportionality ratio or pseudo-elastic modulusEPslope of the initial linear section of the stress-strain curve, if anyNote 1 to entry: Examination of the stress-strain curves for ceramic matrix composit

29、es allows definition of the following cases:a) Material with an initial linear domain in the stress-strain curve.For ceramic matrix composites that have a mechanical behaviour characterized by an initial linear section, the proportionality ratio is defined as:EP()()()122121, =2 ISO 2015 All rights r

30、eservedBS ISO 15733:2015ISO 15733:2015(E)where (1,1) and ( 2,2) lie near the lower and the upper limits of the linear section of the stress-strain curve.The proportionality ratio or pseudo-elastic modulus is termed the elastic modulus, E, in the single case where the linearity starts near the origin

31、.b) Material with no-linear section in the stress-strain curve.In this case only stress-strain couples can be fixed.3.15effective proportionality ratioEPeffslope of the linear section of the stress-strain curve, if any, when the effective tensile stress is used4 PrincipleA test specimen of specified

32、 dimensions is loaded in tension. The test is performed at constant crosshead displacement rate, or constant deformation rate (or constant loading rate). Force and longitudinal deformations are measured and recorded simultaneously.NOTE The use of constant loading rate only gives a valid tensile curv

33、e when the material behaves linearly up to failure.5 Apparatus5.1 Test machineThe test machine shall be equipped with a system for measuring the force applied to the test specimen conforming to grade 1 or better according to ISO 7500-1:2004.5.2 Load trainThe load train configuration shall ensure tha

34、t the load indicated by the load cell and the load experienced by the test specimen are the same.The load train shall align the specimen axis with the direction of load application without introducing bending or torsion in the specimen. The alignment should be verified and documented in accordance w

35、ith, for example, the procedure described in ISO 17161.The maximum percent bending shall not exceed 5 at an average strain of 500 106.The grip design shall prevent the test specimen from slipping.NOTE The choice of gripping system depends on material, on test specimen design and on alignment require

36、ments.5.3 ExtensometerThe extensometer shall be capable of continuously recording the longitudinal deformation at test temperature and adapted for small deformationFor mechanical extensometer, the extensometer class should be 2 (see ISO 9513).The use of an extensometer with the greatest gauge length

37、 is recommended.The gauge length shall be the longitudinal distance between the two locations where the extensometer rods contact the test specimen.Care should be taken to correct for changes in calibration of the extensometer that may occur as a result of operating under conditions different from c

38、alibration. ISO 2015 All rights reserved 3BS ISO 15733:2015ISO 15733:2015(E)If an electro-optical extensometer is used, electro-optical measurements in transmission require reference marks on the test specimen. For this purpose, rods or flags shall be attached to the surface perpendicularly to its a

39、xis. The gauge length shall be the distance between the two reference marks. The material used for marks (and adhesive if used) shall be compatible with the test specimen material and shall not modify the stress field in the specimen.The use of integral flags as parts of the test specimen geometry i

40、s not recommended because of stress concentration induced by such features.Electro-optical extensometer is not recommended in the case where it is not possible to distinguish the colour of the reference marks and the test specimen.5.4 Data recording systemA calibrated recorder may be used to record

41、force-deformation curve. The use of a digital data recording system is recommended.5.5 MicrometersMicrometers used for the measurement of the dimensions of the test specimen shall conform to ISO 3611.6 Test specimens6.1 The choice of the specimen geometry depends on several parameters: the nature of

42、 the material and of the reinforcement structure; the type of the gripping system.Total length lt, depends on the type of machine, on the type of grips and on the type of extensometer. It is recommended to use a total length of at least 100 mm.The volume in the gauge length shall be representative f

43、or the material.Two types of specimen can be distinguished: as fabricated specimens, where only the length and the width are machined to give to the specimens the proper size, in the case the two faces of the specimen may present an irregular surface, machined specimens where the length and the widt

44、h and also the two sides of the specimen have been machined.Tolerance on thickness is only for machined specimens. For as-fabricated specimens the difference in thickness taken out of three measurements (as the centre and at each end of the calibrated length) shall not exceed 5 % of the average of t

45、he three measurements.6.2 Type 1 specimen is represented in Figure 1 and dimensions are given in Table 1.4 ISO 2015 All rights reservedBS ISO 15733:2015ISO 15733:2015(E)rAA-AAb1l tb2lhFigure 1 Type 1 specimen geometryTable 1 Type 1 specimen dimensionsParameterDimensions mmlt, total length 100 0,5l,

46、calibrated length 40 0,2h, thickness 3 0,2b1, width in the calibrated length 8 0,2b2, width 10 0,2r, shoulder radius 30 2Plane parallelism of machined parts 0,05 6.3 Type 2, is a straight-sided specimen. It is represented in Figure 2 and dimensions are given in Table 2.NOTE This test specimen is eas

47、y to machine and its use allows mainly the determination of modulus.Type 2 specimen should not be used for strength measurement.AA-AAl tbhFigure 2 Type 2 specimen geometry ISO 2015 All rights reserved 5BS ISO 15733:2015ISO 15733:2015(E)Table 2 Type 2 specimen dimensionsParameterDimensions mmh, thick

48、ness 3 0,2b, width 10 0,2Plane parallelism of machined parts 0,05 6.4 Type 3 is a straight-sided specimen equipped with tabs.Two types of tabs which cover the total gripped length can be used.a) Metallic or composite tabs bonded or cured on the specimen. The dimensions are given in Table 3 and the s

49、pecimen is represented in Figure 3. This type of specimen is mainly used for 1D, 2D and xD (with 2 x 3) materials;b) Polymeric tabs moulded on the specimen. The dimensions are given in Table 4 and the specimen is represented in Figure 4. This type of specimen is mainly used for 3D materials.AAbA-Al tlhFigure 3 Type 3 specimen geometryTable 3 Type 3 specimen dimensionsParameterDimensions mmlt, total length 100 0,5l, calibrated length 40 0,2Tab le