1、November 2016 English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 81.060.30!%u|“2588289www.din.de
2、DIN EN ISO 23146Fine ceramics (advanced ceramics, advanced technical ceramics) Test methods for fracture toughness of monolithic ceramics Singleedge Vnotch beam (SEVNB) method (ISO 23146:2012);English version EN ISO 23146:2016,English translation of DIN EN ISO 23146:2016-11Hochleistungskeramik Prfve
3、rfahren zur Bestimmung der Bruchzhigkeit monolithischer Keramik Verfahren fr Biegeproben mit VKerb (SEVNBVerfahren) (ISO 23146:2012);Englische Fassung EN ISO 23146:2016,Englische bersetzung von DIN EN ISO 23146:2016-11Cramiques techniques Mthodes dessai pour la dtermination de la tnacit la rupture d
4、es cramiques monolithiques Mthode sur prouvette entaille en V sur une seule face (Mthode SEVNB) (ISO 23146:2012);Version anglaise EN ISO 23146:2016,Traduction anglaise de DIN EN ISO 23146:2016-11SupersedesDIN CEN/TS 144255:200410www.beuth.deDocument comprises 25 pagesDTranslation by DIN-Sprachendien
5、st.In case of doubt, the German-language original shall be considered authoritative.11.16 DIN EN ISO 23146:2016-11 2 A comma is used as the decimal marker. National foreword The text of ISO 23146:2012 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” and has been taken over as EN I
6、SO 23146:2016 by Technical Committee CEN/TC 184 “Advanced technical ceramics” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-02-91 AA Terminologie von Ho
7、chleistungskeramik und Prfung von monolithischen keramischen Werkstoffen und Pulvern. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 3611 DIN EN ISO 3611 ISO 5725-2 DIN ISO 5725-2 ISO 7500-1 DIN EN ISO 7500-1 ISO 15732 DIN EN ISO 15732
8、 ISO 18756 DIN EN ISO 18756 Amendments This standard differs from DIN CEN/TS 14425-5:2004-10 as follows: a) Clause 4 “Principle” has been rendered more precise; b) an example has been added in Subclause 5.3 “Lubricant”; c) in Subclause 7.2 “Flexural-strength test”, a NOTE relating to the subcritical
9、 crack growth has been included; d) in Annex B “Interlaboratory evaluation of the SEVNB fracture toughness test procedures”, a paragraph dealing with yttria tetragonal zirconia polycrystal material (Y-TZP) and a paragraph dealing with the determination of repeatability (within-laboratory) and reprod
10、ucibility (between-laboratories) have been included; e) Annex C “Corrections for effective crack length greater than notch depth” has been added; f) ISO 23146:2012 has been adopted. Previous editions DIN CEN/TS 14425-5:2004-10 DIN EN ISO 23146:2016-11 3 National Annex NA (informative) Bibliography D
11、IN EN ISO 3611, Geometrical Product Specifications (GPS) Dimensional measuring equipment: Micrometers for external measurements Design and metrological characteristics DIN EN ISO 7500-1, Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression t
12、esting machines Calibration and verification of the force-measuring system DIN EN ISO 15732, Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method DIN EN ISO 18756, Fin
13、e ceramics (advanced ceramics, advanced technical ceramics) Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure (SCF) method DIN ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the de
14、termination of repeatability and reproducibility of a standard measurement method DIN EN ISO 23146:2016-11 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 23146 April 2016 ICS 81.060.30 Supersedes CEN/TS 14425-5:2004English Version Fine ceramics (advanced
15、ceramics, advanced technical ceramics) - Test methods for fracture toughness of monolithic ceramics - Single-edge V-notch beam (SEVNB) method (ISO 23146:2012) Cramiques techniques - Mthodes dessai pour la dtermination de la tnacit la rupture des cramiques monolithiques - Mthode sur prouvette entaill
16、e en V sur une seule face (Mthode SEVNB)(ISO 23146:2012) Hochleistungskeramik - Prfverfahren zur Bestimmung der Bruchzhigkeit monolithischer Keramik - Verfahren fr Biegeproben mit V-Kerb (SEVNB-Verfahren) (ISO 23146:2012) This European Standard was approved by CEN on 18 March 2016. CEN members are b
17、ound to comply with the CEN/CENELEC 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
18、 CEN-CENELEC 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 by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centr
19、e has the same status as the official 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
20、, Luxembourg, Malta, Netherlands, 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
21、Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 23146:2016 EContents PageEuropean foreword .31 Scope . 52 Normative references 53 Terms and definitions . 54 Principle 55 Apparatus . 66 Test piece preparation 76.1
22、Number of test pieces . 76.2 Test-piece dimensions 86.3 Preparing the V-notch by hand . 86.4 Preparing the V-notches by machine (optional) . 116.5 Determination of notch-root radius 117 Test procedure . 127.1 Dimensions of test piece 127.2 Flexural-strength test . 127.3 Measurement of notch depth .
23、137.4 Calculation of fracture toughness 138 Precision and bias 159 Test report 15Annex A (informative) Notch honing by machine 16Annex B (informative) Interlaboratory evaluation of the SEVNB fracture toughness test procedures .18Annex C (informative) Corrections for effective crack length greater th
24、an notch depth 20Bibliography .21DIN EN ISO 23146:2016-11 EN ISO 23146:2016 (E) 2Foreword 4European foreword The text of ISO 23146:2012 has been prepared by Technical Committee ISO/TC 206 “Fine ceramics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 23
25、146:2016 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 latest by October 2016, and conflicting nati
26、onal 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 all such patent rights. This document superse
27、des CEN/TS 14425-5:2004. 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, Denmark, Estonia, Finland, Former Yugoslav Republic
28、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. Endorsement notice The text of ISO 23146:2012 has been approve
29、d by CEN as EN ISO 23146:2016 without any modification. DIN EN ISO 23146:2016-11 EN ISO 23146:2016 (E) 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norma
30、lly carried 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 th
31、e work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare In
32、ternational Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of
33、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 23146 was prepared by Technical Committee ISO/TC 206, Fine ceramics.This second edition cancels and replaces the first edition (ISO 23146:2008), of w
34、hich it constitutes a minor revision.DIN EN ISO 23146:2016-11 EN ISO 23146:2016 (E) 4 1 ScopeThis International Standard specifies a method for the determination of the fracture toughness of advanced technical ceramics. The procedure makes use of single-edge V-notched bars, which are loaded in four-
35、point bending until failure. It is applicable to monolithic ceramics with a grain size or major microstructural feature size larger than about 1 m.The use of this International Standard for yttria tetragonal zirconia polycrystal material (Y-TZP) is not recommended. The method might also be unsuitabl
36、e for some other very tough or soft ceramics in which a sharp crack does not form at the root of the V-notch.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,
37、the latest edition of the referenced document (including any amendments) applies.ISO 3611, Geometrical product specifications (GPS) Dimensional measuring instruments; Micrometers for external measurements Design and metrological characteristicsISO 7500-1, Metallic materials Verification of static un
38、iaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring systemISO 14704, Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for flexural strength of monolithic ceramics at room temperatureISO 15732, Fine ceramic
39、s (advanced ceramics, advanced technical ceramics) Test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 15732 apply.4 PrincipleThis me
40、thod of conducting a fracture toughness test is based on the preparation and fracture of bar test pieces in which a sharp-tipped notch is machined. Using the technique of a reciprocating razor blade and diamond paste, a narrow notch can be honed into a test piece using either a manual method or a si
41、mple machine. Under well-controlled conditions, a notch-tip radius in the range of 1 m to 20 m can be prepared depending on the grain size of the test material. For many materials, this is a close approximation to a sharp crack, and the method has been found to give fracture toughness values very cl
42、ose to those of other methods such as the single-edge precracked beam method (ISO 15732) or the surface crack in flexure method (ISO 18756), provided that a sharp crack forms at the root of the notch either during its preparation or during the subsequent fracture sequence. The method has the advanta
43、ge of simplicity of notch production compared with using a sharp-tipped diamond saw or a diamond impregnated wire in which the tip radius is normally greater than 50 m. The method is often N1)National Footnote: In the original ISO document, there is an error in the title of ISO 3611. The reference s
44、hould correctly read: ISO 3611, Geometrical product specifications (GPS) Dimensional measuring equipment: Micrometers for external measurements Design and metrological characteristics N1)DIN EN ISO 23146:2016-11 EN ISO 23146:2016 (E) 5 easier to undertake compared with other methods of precracking a
45、nd is applicable to a wider range of materials outside the scope of these methods.The method has been extensively researched (see the Bibliography) and has been evaluated in an ESIS (European Structural Integrity Society)/VAMAS (Versailles Agreement on Advanced Materials and Standards) round robin,
46、the results of which are summarized in Annex B. This recommended practice is based upon the ESIS/VAMAS SEVNB round robin.The method may have some limitations for materials with grain sizes of less than 1 m, for which the assumption that the notch approximates to a sharp crack may not be valid (see A
47、nnex C). Users should strive to minimize the notch-root radius in the test pieces. This International Standard places a provisional criterion that the notch-root radius should be similar to or less than twice the average grain size of the material.The method is complementary to other methods of meas
48、uring fracture toughness described in ISO 15732 (single-edge precracked beam method), ISO 18756 (surface crack in flexure method), and ISO 24370 (chevron notch method); see the Bibliography.5 Apparatus5.1 Ordinary razor blades, preferably with a support along one edge but alternatively inserted in a suitable holder.NOTE 1 Razor blades thinner than about 0,2 mm are not ideal for this task unless stiffened by a support, such as by gluing or screwing between
