1、BRITISH STANDARDBS EN ISO 15732:2005Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method The European Standard EN ISO 15732:2005 has the status of a British StandardIC
2、S 81.060.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 15732:2005This British Standard was published under the authority of the Standa
3、rds Policy and Strategy Committee on 31 March 2006 BSI 2006ISBN 0 580 48053 4National forewordThis British Standard is the official English language version of EN ISO 15732:2005. It is identical with ISO 15732:2003.The UK participation in its preparation was entrusted to Technical Committee RPI/13,
4、Advanced technical ceramics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European dev
5、elopments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under
6、the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applica
7、tion. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 21 and a back cover.The BSI
8、 copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 15732June 2005ICS 81.060.30English versionFine ceramics (advanced ceramics, advanced technicalcerami
9、cs) - Test method for fracture toughness of monolithicceramics at room temperature by single edge precracked beam(SEPB) method (ISO 15732:2003)Cramiques techniques - Mthode dessai de tnacit larupture des cramiques monolithiques tempratureambiante sur prouvette prfissure sur une seule face(mthode SEP
10、B) (ISO 15732:2003)Hochleistungskeramik - Prfverfahren zur Bestimmung derBruchzhigkeit monolithischer Keramik beiRaumtemperatur an einseitig gekerbten Biegeproben(SEPB-Verfahren) (ISO 15732:2003)This European Standard was approved by CEN on 2 June 2005.CEN members are bound to comply with the CEN/CE
11、NELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any C
12、EN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN memb
13、ers are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and Unite
14、d Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 15732:2005: E
15、Foreword The text of ISO 15732:2003 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 15732:2005 by Technical Committee CEN/TC 184 “Advanced technical ceramics“, the secretariat of which i
16、s held by BSI. 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 December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. This document is part of a serie
17、s: CEN/TS 14425-1 Advanced technical ceramics Test methods for determination of fracture toughness of monolithic ceramics Part 1: Guide to test method selection CEN/TS 14425-3 Advanced technical ceramics Test methods for determination of fracture toughness of monolithic ceramics Part 3: Chevron notc
18、hed beam (CNB) method CEN/TS 14425-5 Advanced technical ceramics Test methods for determination of fracture toughness of monolithic ceramics Part 5: Single-edge V-notch beam (SEVNB) method EN ISO 15732 Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for fracture toughness
19、of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method EN ISO 18756 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of fracture toughness of monolithic ceramics at room temperature by the surface crack in flexure (SCF) method According to
20、 the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
21、embourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 15732:2003 has been approved by CEN as EN ISO 15732:2005 without any modifications. EN ISO 15732:2005Reference numberISO 15732:2003(E)INTERNATI
22、ONAL STANDARD ISO15732First edition2003-09-01Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method Cramiques techniques Mthode dessai de tnacit la rupture des cramiques
23、 monolithiques temprature ambiante sur prouvette prfissure sur une seule face (mthode SEPB) EN ISO 15732:2005ii EN ISO 15732:2005iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 2 4 Symbols and designations. 3 5 Principle . 3 6 Apparatus. 4 7 Test specimens
24、. 7 8 Test methods. 8 9 Evaluation of validity of measured value . 13 10 Calculation . 14 11 Test report 15 Annex A (informative) Precracking fixture. 16 Annex B (informative) Recommended procedures in SEPB method 18 Bibliography . 21 EN ISO 15732:2005iv Foreword ISO (the International Organization
25、for Standardization) 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 t
26、he right 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. Interna
27、tional 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 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicatio
28、n 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 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
29、. ISO 15732 was prepared by Technical Committee ISO/TC 206, Fine ceramics. 1Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for fracture toughness of monolithic ceramics at room temperature by single edge precracked beam (SEPB) method 1 Scope This International Standard de
30、scribes a test method for the determination of fracture toughness of monolithic ceramic materials at room temperature by the Single Edge Precracked Beam (SEPB) method.This International Standard is intended for use with monolithic ceramics and whisker- or particulate-reinforced ceramics which are re
31、garded as macroscopically homogeneous. It does not include continuous-fiber-reinforced ceramic composites. This International Standard is for material development, material comparison, quality assurance, characterization, reliability and design data generation. Fracture toughness values determined w
32、ith other test methods cannot be interchanged with KIpbas defined in this International Standard, and may not be interchangeable with each other. Values expressed in this International Standard are in accordance with the International System of Units (SI). 2 Normative references The following refere
33、nced 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 amendments) applies. ISO 1101:1983, Technical drawings Geometrical tolerancing Tolerancing
34、 of form, orientation, location and run-out Generalities, definitions, symbols, indications on drawings ISO 3312:1987, Sintered metal materials and hardmetals Determination of Young modulus ISO 4287:1997, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and
35、 surface texture parameters ISO 6507-1:1997, Metallic materials Vickers hardness test Part 1: Test method EN ISO 15732:20052 3 Terms and definitions For the purpose of this document, the following terms and definitions apply. 3.1 stress intensity factor KImagnitude of the elastic stress field singul
36、arity at the tip of a crack subjected to opening mode displacement NOTE It is a function of applied force and test specimen size, geometry and crack length, and has the dimensions of force times length3/2. 3.2 fracture toughness generic term for the magnitude of resistance to crack extension 3.3 fra
37、cture toughness value KIpbfracture toughness value measured by the SEPB method NOTE This represents the measured stress intensity factor corresponding to the extension resistance of a straight-through pop-in crack formed via bridge loading of a Vickers indent or a saw notch. The measurement is perfo
38、rmed in accordance with the operational procedure described in Clauses 5 and 10 and satisfies all the validity requirements. 3.4 precrack crack induced artificially into a specimen, primarily so as to measure the fracture toughness 3.5 precrack front line line to indicate the position of the tip of
39、the precrack 3.6 pop-in phenomenon where a crack arrests after sudden and unstable growth giving rise to an acoustic signature 3.7 three-point bending loading configuration where a beam specimen is loaded at a location midway between two support pins 3.8 four-point bending loading configuration wher
40、e a beam specimen is symmetrically loaded at two locations that are situated one quarter of the overall span away from the outer two support pins 3.9 compliance reciprocal of the gradient of the load versus deflection curve NOTE Accordingly, as the crack extends, the increase of deflection results i
41、n an increase of compliance. EN ISO 15732:200534 Symbols and designations The symbols used throughout this International Standard and their designations are given in Table 1. Table 1 Symbols and designations Symbol Unit Designation References b mm Width of central groove in anvil A.2.3, Fig. A.1 d m
42、m Thickness of specimen 7.1, Fig. 3 d1mm Distance between supporting roller pins in bend test fixture (lower span) 6.4, Fig. 2 d2mm Distance between loading roller pins in four-point bend test fixture (upper span) 6.4, Fig. 2 KIpbMPam1/2Critical stress intensity factor measured by the SEPB method Cl
43、ause 10, Eqs. 7 and 10l mm Length of precrack 8.7.3, Fig. 6, Eq. 2 l mm Stable crack growth length 8.7.4, Fig. 6, Eq. 3 L mm Length of specimen 7.1, Fig. 3 Lamm Length of bottom surface of specimen positioning groove of anvil (including the width, b, of central groove) A.2.3, Fig. A.1 Lpmm Length of
44、 lower surface of loading plate A.2.3, Fig. A.1 PfN Maximum load during fracture of specimen 8.5.3, Fig. 5 w mm Width (depth) of specimen 7.1, Fig. 3 Ol / Ol 1 Compliance change 8.6, Eq. 1 5 Principle This method is to obtain the fracture toughness value, KIpb, from the precrack length, specimen dim
45、ensions and distance between the bending supports by measuring the fracture load of specimen according to the three or four-point bending fracture test of a single-edge-precracked beam specimen. A straight-through pop-in precrack is induced in the specimen via bridge loading of a Vickers indent or a
46、 saw notch. Generally, this test is carried out under conditions of ambient temperature and environment. EN ISO 15732:20054 6 Apparatus 6.1 Precracking fixture An appropriate apparatus is required to induce a pop-in precrack in the specimen in such a way that the crack front is approximately paralle
47、l to the specimen surface. An example of the basic components of the bridge compression precracking fixture are a loading plate with a ball seat, an anvil with a central groove and a specimen-positioning groove, and a loading ball as shown in Figure 1. The shapes of the loading plate and the anvil t
48、o be used are symmetric from right to left, and from front to rear, and have depth exceeding at least three times the thickness of the specimen, d. The horizontal distance between the centre of the loading ball and the centre of the anvil is less than 0,1 mm. NOTE Annex A contains recommendations fo
49、r the typical design of a suitable bridge compression fixture that has been found to work satisfactorily for most types of ceramic materials. Key 1 compression load 2 loading ball 3 loading plate 4 upper loading plate; e.g., of hardened steel with ballseat 5 lower loading plate; e.g., of silicon nitride with mirror polished lower surface (joined to upper loading plate) 6 specimen 7 central groove 8 specimen positioning groove 9 anvil; e.g., of hardened steel (HV 10 ! 5 GPa) Figure 1 Example of br
