EN 14186-2007 en Advanced technical ceramics - Mechanical properties of ceramic composites at room temperature - Determination of elastic properties by an ultrasonic technique《高级陶瓷.pdf
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1、BRITISH STANDARDBS EN 14186:2007Advanced technical ceramics Mechanical properties of ceramic composites at room temperature Determination of elastic properties by an ultrasonic techniqueThe European Standard EN 14186:2007 has the status of a British StandardICS 81.060.30g49g50g3g38g50g51g60g44g49g42
2、g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14186:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 Janu
3、ary 2008 BSI 2007ISBN 978 0 580 58326 1National forewordThis British Standard is the UK implementation of EN 14186:2007. It supersedes DD ENV 14186:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics.A list of organ
4、izations 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.Compliance with a British Standard cannot confer immunity from legal obligatio
5、ns.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14186November 2007ICS 81.060.30 Supersedes ENV 14186:2002 English VersionAdvanced technical ceramics - Mechanical properties of ceramiccomposites at room temperature - Determination of elast
6、icproperties by an ultrasonic techniqueCramiques techniques avances - Proprits mcaniquesdes cramiques composites temprature ambiante -Dtermination des proprits lastiques par une mthodeultrasonoreHochleistungskeramik - Mechanische Eigenschaftenkeramischer Verbundwerkstoffe bei Raumtemperatur -Bestimm
7、ung von elastischen Eigenschaften mittelsUltraschallwellenThis European Standard was approved by CEN on 13 October 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without
8、any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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
9、by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Ge
10、rmany, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMa
11、nagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14186:2007: EEN 14186:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Princi
12、ple7 5 Significance and use .10 6 Apparatus .10 6.1 Ultrasonic tank with thermostatic control.10 6.2 Temperature measurement device 10 6.3 Test specimen holder10 6.4 Transducers .11 6.5 Transducer holders .11 6.6 Pulse generator11 6.7 Signal recording system .11 7 Test specimens11 8 Test specimen pr
13、eparation.11 9 Test procedure.12 9.1 Choice of frequency 12 9.2 Establishment of the test temperature 12 9.3 Reference test without test specimen .12 9.4 Measurement with the specimen .13 10 Calculation14 10.1 Delay .14 10.2 Calculation of the propagation velocities .14 10.3 Calculation of the refra
14、cted angle r.14 10.4 Identification of the elastic constants, Cij.14 10.5 Back calculation of the phase velocities.18 10.6 Polar plots of the velocity curves 18 10.7 Calculation of the quadratic deviation.18 10.8 Calculation of the engineering constants .18 11 Test validity 19 11.1 Measurements19 11
15、.2 Criterion of validity for the reliability of the Cijcomponents19 12 Test report 19 Annex A (informative) Example of a presentation of the results for a material with orthothropic symmetry 21 A.1 Velocity curves.21 A.2 Stiffness matrix with stiffness components .22 A.3 Engineering constants 23 Bib
16、liography 24 EN 14186:2007 (E) 3 Foreword This document (EN 14186:2007) has been prepared by Technical Committee CEN/TC 184 “Advanced technical ceramics”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an ide
17、ntical text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. This document supersedes ENV 14186:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are b
18、ound to implement this European Standard: Austria, 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,
19、 Switzerland and United Kingdom. EN 14186:2007 (E) 4 1 Scope This European Standard specifies an ultrasonic method to determine the components of the elasticity tensor of ceramic matrix composite materials at room temperature. Youngs moduli, shear moduli and Poisson coefficients, can be determined f
20、rom the components of the elasticity tensor. This European Standard applies to ceramic matrix composites with a continuous fibre reinforcement: unidirectional (1D), bidirectional (2D), and tridirectional (D, with 2 3) which have at least orthotropic symmetry, and whose material symmetry axes are kno
21、wn. This method is applicable only when the ultrasonic wave length used is larger than the thickness of the representative elementary volume, thus imposing an upper limit to the frequency range of the transducers used. NOTE Properties obtained by this method might not be comparable with moduli obtai
22、ned by EN 658-1, EN 658-2 and EN 12289. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendme
23、nts) applies. EN 1389, Advanced technical ceramics Ceramic composites Physical properties Determination of density and apparent porosity CEN/TR 13233:2007, Advanced technical ceramics Notations and symbols EN ISO/IEC 17025, General requirements for the competence of testing and calibration laborator
24、ies (ISO/IEC 17025:2005) ISO 3611, Micrometer callipers for external measurements 3 Terms and definitions For the purposes of this document, the terms and definitions given in CEN/TR 13233:2007 and the following apply. 3.1 stress-strain relations for orthotropic material elastic anisotropic behaviou
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