1、BS ENISO 148-2:2008ICS 77.040.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMetallic materials -Charpy pendulumimpact testPart 2: Verification of test machines (ISO 148-2:2008) ingCopyright European Committee for Standardization Provided by IHS under license
2、 with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-This British Standard was published under theauthority of the StandardsPolicy and StrategyCommittee on 31 March2009 BSI 2009ISBN 978 0 580 55467 4Amendments/corrigenda issued since publicationDate CommentsBS
3、EN ISO 148-2:2008National forewordThis British Standard is the UK implementation of EN ISO Together with BS EN ISO 148-3:2008 it supersedes BS EN 10045-2:1993 which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee ISE/NFE/4/4, Toughness testing.A list of orga
4、nizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations
5、.148-2:2008. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 148-2December 2008ICS 77.040.10 Supersedes EN 10045-2:1992 Engl
6、ish VersionMetallic materials - Charpy pendulum impact test - Part 2:Verification of testing machines (ISO 148-2:2008)Matriaux mtalliques - Essai de flexion par choc surprouvette Charpy - Partie 2: Vrification des machinesdessai (mouton-pendule) (ISO 148-2:2008)Metallische Werkstoffe - Kerbschlagbie
7、geversuch nachCharpy - Teil 2: Prfung der Prfmaschinen(Pendelschlagwerke) (ISO 148-2:2008)This European Standard was approved by CEN on 19 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the statu
8、s of a national standard without 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 ve
9、rsion in any other language made 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, Den
10、mark, Estonia, Finland,France, Germany, 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 NORMALISATIO
11、NEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 148-2:2008: ECopyright European Committee for Standardization Provided by IHS under license
12、with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN ISO 148-2:2008 (E) 3 Foreword This document (EN ISO 148-2:2008) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in collaboration with Technical Committee ECISS/TC 1 “Steel
13、 - Mechanical testing“ the secretariat of which is held by AFNOR. 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 June 2009, and conflicting national standards shall be withdrawn at the latest by
14、June 2009. This document, together with EN ISO 148-3:2008, supersedes EN 10045-2:1992. 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.
15、 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
16、 Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 148-2:2008 has been approved by CEN as a EN ISO 148-2:2008 without any modification. BS EN ISO 148-2:2008Co
17、pyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 148-2:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 2 3
18、Terms and definitions. 2 3.1 Definitions pertaining to the machine 2 3.2 Definitions pertaining to energy 3 3.3 Definitions pertaining to test pieces. 4 4 Symbols and abbreviated terms . 4 5 Testing machine 6 6 Direct verification 6 6.1 General. 6 6.2 Foundation/installation 6 6.3 Machine framework
19、6 6.4 Pendulum. 7 6.5 Anvil and supports . 11 6.6 Indicating equipment 11 7 Indirect verification by use of reference test pieces. 12 7.1 Reference test pieces used . 12 7.2 Absorbed energy levels . 12 7.3 Requirements for reference test pieces . 12 7.4 Limited direct verification 12 7.5 Bias and re
20、peatability. 13 8 Frequency of verification . 13 9 Verification report. 14 9.1 General. 14 9.2 Direct verification 14 9.3 Indirect verification. 14 10 Uncertainty 14 Annex A (informative) Measurement uncertainty of the result of the indirect verification of a Charpy pendulum impact machine . 21 Anne
21、x B (informative) Measurement uncertainty of the results of the direct verification of a Charpy pendulum impact testing machine 25 Annex C (informative) Direct method of verifying the geometric properties of pendulum impact testing machines using a jig 31 Bibliography . 38 BS EN ISO 148-2:2008Copyri
22、ght European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 148-2:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federa
23、tion 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 right to be represented on that committ
24、ee. 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 Standards are drafted in accordance
25、 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 International Standard requires ap
26、proval 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 148-2 was prepared by Technical Comm
27、ittee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 4, Toughness testing Fracture (F), Pendulum (P), Tear (T). This second edition cancels and replaces the first edition (ISO 148-2:1998), which has been technically revised. ISO 148 consists of the following parts, under the general title
28、 Metallic materials Charpy pendulum impact test: Part 1: Test method Part 2: Verification of testing machines Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines BS EN ISO 148-2:2008Copyright European Committee for Standardizat
29、ion Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 148-2:2008(E) ISO 2008 All rights reserved vIntroduction The suitability of a pendulum impact testing machine for acceptance testing of metallic materials has usually been
30、 based on a calibration of its scale and verification of compliance with specified dimensions, such as the shape and spacing of the anvils supporting the specimen. The scale calibration is commonly verified by measuring the mass of the pendulum and its elevation at various scale readings. This proce
31、dure for evaluation of machines had the distinct advantage of requiring only measurements of quantities that could be traced to national standards. The objective nature of these traceable measurements minimized the necessity for arbitration regarding the suitability of the machines for material acce
32、ptance tests. However, sometimes two machines that had been evaluated by the direct-verification procedures described above, and which met all dimensional requirements, were found to give significantly different impact values when testing test pieces of the same material. This difference was commerc
33、ially important when values obtained using one machine met the material specification, while the values obtained using the other machine did not. To avoid such disagreements, some purchasers of materials added the requirement that all pendulum impact testing machines used for acceptance testing of m
34、aterial sold to them must be indirectly verified by testing reference test pieces supplied by them. A machine was considered acceptable only if the values obtained using the machine agreed, within specified limits, with the value furnished with the reference test pieces. BS EN ISO 148-2:2008Copyrigh
35、t European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 148-2:2008Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction o
36、r networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD ISO 148-2:2008(E) ISO 2008 All rights reserved 1Metallic materials Charpy pendulum impact test Part 2: Verification of testing machines 1 Scope This part of ISO 148 covers the verification of the constructional elements of pe
37、ndulum-type impact testing machines. It is applicable to machines with 2 mm or 8 mm strikers used for pendulum impact tests carried out, for instance, in accordance with ISO 148-1. It can analogously be applied to pendulum impact testing machines of various capacities and of different design. Impact
38、 machines used for industrial, general or research laboratory testing of metallic materials in accordance with this part of ISO 148 are referred to as industrial machines. Those with more stringent requirements are referred to as reference machines. Specifications for the verification of reference m
39、achines are found in ISO 148-3. This part of ISO 148 describes two methods of verification. a) The direct method, which is static in nature, involves measurement of the critical parts of the machine to ensure that it meets the requirements of this part of ISO 148. Instruments used for the verificati
40、on and calibration are traceable to national standards. Direct methods are used when a machine is being installed or repaired, or if the indirect method gives a non-conforming result. b) The indirect method, which is dynamic in nature, uses reference test pieces to verify points on the measuring sca
41、le. A pendulum impact testing machine is not in compliance with this part of ISO 148 until it has been verified by both the direct and indirect methods and meets the requirements of Clauses 6 and 7. The requirements for the reference test pieces are found in ISO 148-3. This part of ISO 148 takes int
42、o account the total energy absorbed in fracturing the test piece using an indirect method. This total absorbed energy consists of the energy needed to break the test piece itself, and the internal energy losses of the pendulum impact testing machine performing the first half-cycle swing from the ini
43、tial position. NOTE Internal energy losses are due to air resistance, friction of the bearings of the rotation axis and of the indicating pointer of the pendulum which can be determined by the direct method (see 6.4.5), and shock of the foundation, vibration of the frame and pendulum for which no su
44、itable measuring methods and apparatus have been developed. BS EN ISO 148-2:2008Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 148-2:2008(E) 2 ISO 2008 All rights reserved2
45、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 amendments) applies. ISO 148-1, Metallic material
46、s Charpy pendulum impact test Part 1: Test method ISO 148-3, Metallic materials Charpy pendulum impact test Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines 3 Terms and definitions For the purposes of this document, the foll
47、owing terms and definitions apply. 3.1 Definitions pertaining to the machine 3.1.1 anvil portion of the machine that serves to properly position the test piece for impact with respect to the striker and the test piece supports, and supports the test piece under the force of the strike 3.1.2 base tha
48、t part of the framework of the machine located below the horizontal plane of the supports 3.1.3 centre of percussion that point in a body at which, on striking a blow, the percussive action is the same as if the whole mass of the body were concentrated at the point NOTE When a simple pendulum delivers a blow along a horizontal line passing through the centre of percussion, there is no resulting horizontal reaction at the axis of rotation. See Figure 4. 3.1.4 centre of strike that point on the striking edge of the pendulum at which, in the free hanging position of
