1、BS EN ISO 148-2:2016Metallic materials Charpy pendulum impact testPart 2: Verification of testing machines (ISO 148-2:2016) BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 148-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implement
2、ation of EN ISO 148-2:2016.It supersedes BS EN ISO 148-2:2008 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/101/4, Toughness testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 84277 1ICS 77.040.10Compliance with a British Standard cannot confer immunity fromleg
4、al obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2016.Amendments/Corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 148-2 November 2016 ICS 77.040.10 Supersed
5、es EN ISO 148-2:2008English Version Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines (ISO 148-2:2016) Matriaux mtalliques - Essai de flexion par choc sur prouvette Charpy - Partie 2: Vrification des machines dessai (mouton-pendule) (ISO 148-2:2016) Metallis
6、che Werkstoffe - Kerbschlagbiegeversuch nach Charpy - Teil 2: berprfung der Prfmaschinen (Pendelschlagwerke) (ISO 148-2:2016) This European Standard was approved by CEN on 20 August 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv
7、ing 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three off
8、icial 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 Centre has the same status as the official versions. CEN members are the national standards bodies o
9、f Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
10、 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 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide fo
11、r CEN national Members. Ref. No. EN ISO 148-2:2016 EEN ISO 148-2:2016 (E) 3 European foreword This document (EN ISO 148-2:2016) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals” in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other tha
12、n chemical analysis)” 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 May 2017, and conflicting national standards shall be withdrawn at the latest by Ma
13、y 2017. 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 supersedes EN ISO 148-2:2008. According to the CEN-CENELEC Inter
14、nal 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 of Macedonia, France, Germany, Greece, Hungary, Iceland, Ir
15、eland, 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 148-2:2016 has been approved by CEN as EN ISO 148-2:2016 without any modification. BS
16、EN ISO 148-2:2016BS EN ISO 148-2:2016ISO 148-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 23.1 Definitions pertaining to the machine 23.2 Definitions pertaining to energy 33.3 Definitions pertaining to test pieces 44 Symbols and abbreviated terms . 4
17、5 Testing machine 66 Direct verification . 66.1 General . 66.2 Foundation/installation 66.3 Machine framework 76.4 Pendulum . 86.5 Anvil and supports 116.6 Indicating equipment . 127 Indirect verification by use of reference test pieces 137.1 Reference test pieces used . 137.2 Absorbed energy levels
18、. 137.3 Requirements for reference test pieces 137.4 Limited direct verification . 137.5 Bias and repeatability 137.5.1 Repeatability 137.5.2 Bias .148 Frequency of verification 149 Verification report .149.1 General 149.2 Direct verification 159.3 Indirect verification . 1510 Uncertainty 15Annex A
19、(informative) Measurement uncertainty of the result of the indirect verification of a Charpy pendulum impact machine 21Annex B (informative) Measurement uncertainty of the results of the direct verification of a Charpy pendulum impact testing machine 25Annex C (informative) Direct method of verifyin
20、g the geometric properties of pendulum impact testing machines using a jig .32Bibliography .38 ISO 2016 All rights reserved iiiContents PageBS EN ISO 148-2:2016ISO 148-2:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS
21、O 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 committee. International organizations, gove
22、rnmental 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.The procedures used to develop this document and those intended for its further mainten
23、ance are described in the ISO/IEC Directives, Part 1. In particular the different approval 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).Attenti
24、on 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. Details of any patent rights identified during the development of the document will be in the Introduction a
25、nd/or on the ISO list of patent declarations received (see www.iso.org/patents).Any 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
26、assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee
27、 SC 4, Toughness testing Fracture (F), Pendulum (P), Tear (T) .This third edition cancels and replaces the second edition (ISO 148-2:2008), which has been technically revised.ISO 148 consists of the following parts, under the general title Metallic materials Charpy pendulum impact test: Part 1: Test
28、 method Part 2: Verification of testing machines Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machinesiv ISO 2016 All rights reservedBS EN ISO 148-2:2016ISO 148-2:2016(E)IntroductionThe suitability of a pendulum impact testing ma
29、chine for acceptance testing of metallic materials has usually been 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 t
30、he pendulum and its elevation at various scale readings. This procedure 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 arbi
31、tration regarding the suitability of the machines for material acceptance 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 tes
32、ting test pieces of the same material.This difference was commercially 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
33、pendulum impact testing machines used for acceptance testing of material sold to them are to 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 fur
34、nished with the reference test pieces.This part of ISO 148 describes both the original direct verification and the indirect verification procedures. ISO 2016 All rights reserved vBS EN ISO 148-2:2016BS EN ISO 148-2:2016Metallic materials Charpy pendulum impact test Part 2: Verification of testing ma
35、chines1 ScopeThis part of ISO 148 covers the verification of pendulum-type impact testing machines, in terms of their constructional elements, their overall performance and the accuracy of the results they produce. It is applicable to machines with 2 mm or 8 mm strikers used for pendulum impact test
36、s carried out, for instance, in accordance with ISO 148-1.It can be applied to pendulum impact testing machines of various capacities and of different design.Impact machines used for industrial, general or research laboratory testing of metallic materials in accordance with this part of ISO 148 are
37、referred to as industrial machines. Those with more stringent requirements are referred to as reference machines. Specifications for the verification of reference machines are found in ISO 148-3.This part of ISO 148 describes two methods of verification.a) The direct method, which is static in natur
38、e, involves measurement of the critical parts of themachine to ensure that it meets the requirements of this part of ISO 148. Instruments used for theverification and calibration are traceable to national or international standards.b) The indirect method, which is dynamic in nature, uses reference t
39、est pieces to verify points on themeasuring scale for absorbed energy. The requirements for the reference test pieces are found inISO 148-3.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 th
40、e requirements of Clause 6 and Clause 7.This part of ISO 148 describes how to assess the different components of the total energy absorbed in fracturing a test piece. This total absorbed energy consists of the energy needed to fracture the test piece itself, and the internal energy losses of the pen
41、dulum impact testing machine performing the first half-cycle swing from the initial position.NOTE Internal energy losses are due to the following: 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
42、(see 6.4.5); shock of the foundation, vibration of the frame and pendulum for which no suitable measuring methods and apparatus have been developed.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its applicatio
43、n. 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 materials Charpy pendulum impact test Part 1: Test methodINTERNATIONAL STANDARD ISO 148-2:2016(E) ISO 2016 All rights
44、reserved 1BS EN ISO 148-2:2016ISO 148-2:2016(E)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 machines3 Terms and definitionsFor the purposes of this document, the following
45、 terms and definitions apply.3.1 Definitions pertaining to the machine3.1.1anvilportion 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 strike3.1.2basepart of the fra
46、mework of the machine located below the horizontal plane of the supports3.1.3centre of percussionpoint 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 pointNote 1 to entry: When a simple pendulum delivers a blow alon
47、g a horizontal line passing through the centre of percussion, there is no resulting horizontal reaction at the axis of rotation.Note 2 to entry: See Figure 4.3.1.4centre of strikepoint on the striking edge of the pendulum at which, in the free hanging position of the pendulum, the vertical edge of t
48、he striker meets the upper horizontal plane of a test piece of half standard thickness (i.e. 5 mm) or equivalent gauge bar resting on the test piece supportsNote 1 to entry: See Figure 4.3.1.5industrial machinependulum impact machine used for industrial, general or most research-laboratory testing o
49、f metallic materialsNote 1 to entry: Industrial machines are not used to establish reference values, unless they also meet the requirements of a reference pendulum (see ISO 148-3).Note 2 to entry: Industrial machines are verified using the procedures described in this part of ISO 148.3.1.6reference machinependulum impact testing machine used to determine certified values for batches of reference test pieces (3.3.4)Note 1 to entry: Reference machines are verified using the procedures described in ISO 148-3.3.1.7strikerportion of the pen
