1、BSI Standards PublicationBS EN ISO 14556:2015Metallic materials Charpy V-notch pendulum impact test Instrumented test methodBS EN ISO 14556:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 14556:2015. It supersedes BS EN ISO 14556:2000 which iswithdrawn.
2、The UK participation in its preparation was entrusted to Technical Committee ISE/101/4, Toughness testing.A list of organizations 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 a
3、re responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 84279 5 ICS 77.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of t
4、he Standards Policy and Strategy Committee on 31 October 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14556 October 2015 ICS 77.040.10 Supersedes EN ISO 14556:2000English Version Metallic materials - Charpy V-
5、notch pendulum impact test - Instrumented test method (ISO 14556:2015) Matriaux mtalliques - Essai de flexion par choc sur prouvette Charpy entaille en V - Mthode dessai instrument (ISO 14556:2015) Metallische Werkstoffe - Kerbschlagbiegeversuch nach Charpy (V-Kerb) - Instrumentiertes Prfverfahren (
6、ISO 14556:2015) This European Standard was approved by CEN on 3 July 2015. CEN members are bound 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 bibliog
7、raphical 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 official versions (English, French, German). A version in any other language made by translation under the responsib
8、ility 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 of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republi
9、c 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALIS
10、ATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14556:2015 EBS EN ISO 14556:2015EN ISO 14556:2015 (E) 3 European forewor
11、d This document (EN ISO 14556:2015) 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 than chemical analysis)” the secretariat of which is held by AFNOR. This European Standard shal
12、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2016, and conflicting national standards shall be withdrawn at the latest by April 2016. Attention is drawn to the possibility that some of the elements of this document
13、 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 14556:2000. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bou
14、nd 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portuga
15、l, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 14556:2015 has been approved by CEN as EN ISO 14556:2015 without any modification. BS EN ISO 14556:2015ISO 14556:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms
16、and definitions . 13.1 Characteristic values of force 13.2 Characteristic values of displacement 23.3 Characteristic values of impact energy 24 Symbols and abbreviated terms . 25 Principle 36 Apparatus . 47 Test piece 68 Test procedure 69 Expression of results 69.1 General . 69.2 Evaluation of the f
17、orce-displacement curve 79.3 Determination of the characteristic values of force 79.4 Determination of the characteristic values of displacement . 79.5 Determination of the characteristic values of impact energy 910 Test report . 9Annex A (informative) Designs of instrumented strikers 11Annex B (inf
18、ormative) Example of support block for the calibration of a 2 mm striker .12Annex C (informative) Formulae for the estimation of the proportion of ductile fracture surface 13Annex D (normative) Instrumented Charpy V-notch pendulum impact testing of miniature test pieces .14Bibliography .20 ISO 2015
19、All rights reserved iiiContents PageBS EN ISO 14556:2015ISO 14556:2015(E)ForewordISO (the International Organization 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 tech
20、nical 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 the work. ISO collaborates closely
21、 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 maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria need
22、ed 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).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent r
23、ights. 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 and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in t
24、his 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 assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers
25、to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee SC 4, Toughness testing.This second edition cancels and replaces the first edition (ISO 14556:2000), which has been technica
26、lly revised.iv ISO 2015 All rights reservedBS EN ISO 14556:2015INTERNATIONAL STANDARD ISO 14556:2015(E)Metallic materials Charpy V-notch pendulum impact test Instrumented test method1 ScopeThis International Standard specifies a method of instrumented Charpy V-notch pendulum impact testing on metall
27、ic materials and the requirements concerning the measurement and recording equipment.With respect to the Charpy pendulum impact test described in ISO 148-1, this test provides further information on the fracture behaviour of the product under impact testing conditions.General information about instr
28、umented impact testing can be found in Reference 1 to Reference 5.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, t
29、he latest edition of the referenced document (including any amendments) applies.ISO 148-1, Metallic materials Charpy pendulum impact test Part 1: Test method.ISO 148-2, Metallic materials Charpy pendulum impact test Part 2: Verification of testing machines.3 Terms and definitionsFor the purposes of
30、this document, the following terms and definitions apply.3.1 Characteristic values of force3.1.1general yield forceFgyforce at the transition point from the linearly increasing part to the curved increasing part of the force-displacement curveNote 1 to entry: It represents a first approximation of t
31、he force at which yielding has occurred across the entire test piece ligament (see 9.3).3.1.2maximum forceFmmaximum force in the course of the force-displacement curve3.1.3unstable crack initiation forceFiuforce at the beginning of the steep drop in the force-displacement curve (unstable crack initi
32、ation)3.1.4crack arrest forceFaforce at the end (arrest) of unstable crack propagation ISO 2015 All rights reserved 1BS EN ISO 14556:2015ISO 14556:2015(E)3.2 Characteristic values of displacement3.2.1general yield displacementsgydisplacement corresponding to the general yield force, Fgy3.2.2displace
33、ment at maximum forcesmdisplacement corresponding to the maximum force, Fm3.2.3crack initiation displacementsiudisplacement corresponding to the force at unstable crack initiation, Fiu3.2.4crack arrest displacementsadisplacement corresponding to the force at the end (arrest) of unstable crack propag
34、ation, Fa3.2.5total displacementstdisplacement at the end of the force-displacement curve3.3 Characteristic values of impact energy3.3.1energy at maximum forceWmpartial impact energy from s = 0 to s = sm3.3.2unstable crack initiation energyWiupartial impact energy from s = 0 to s = siu3.3.3crack arr
35、est energyWapartial impact energy from s =0 to s = sa3.3.4total impact energyWtenergy absorbed by the test piece during the testNote 1 to entry: Calculated from the area under the force-displacement curve from s =0 to s = st.4 Symbols and abbreviated termsFor the purposes of this document, the symbo
36、ls and abbreviations given in Table 1 are applicable (see also Figure 2 and Figure 3).2 ISO 2015 All rights reservedBS EN ISO 14556:2015ISO 14556:2015(E)Table 1 Symbols and designationsSymbol Designation UnitfgOutput frequency limit HzF Force NFaCrack arrest force NFgyGeneral yield force NFiuUnstabl
37、e crack initiation force NFmMaximum force NgnAcceleration due to gravity m/s2h Height of fall of the centre of strike of the pendulum (see ISO 148-2) mKV Absorbed energy as defined in ISO 148-1 Jm Effective mass of the pendulum corresponding to its effective weight (see ISO 148-2) kgs Displacement m
38、saCrack arrest displacement msgyGeneral yield displacement msiuDisplacement at unstable crack initiation msmDisplacement at maximum force mstTotal displacement mt Time stoTime at the beginning of deformation of the test piece strSignal rise time svoInitial striker impact velocity m/svtStriker impact
39、 velocity at time t m/sWaCrack arrest energy JWiuEnergy at unstable crack initiation JWmEnergy at maximum force JWtTotal impact energy J5 Principle5.1 This test consists of measuring the impact force, in relation to the test piece bending displacement, during an impact test carried out in accordance
40、 with ISO 148-1. The area under the force-displacement curve is a measure of the energy absorbed by the test piece.5.2 Force-displacement curves for different steel products and different temperatures can be quite different, even though the areas under the curves and the absorbed energies are identi
41、cal. If the force-displacement curves are divided into characteristic parts, various phases of the test can be deduced which provide considerable information about the behaviour of the test piece at impact loading rates.NOTE The force-displacement curve cannot be used in strength calculations of str
42、uctures. It is not possible to directly determine the lowest permissible operating temperature for a material in a construction. ISO 2015 All rights reserved 3BS EN ISO 14556:2015ISO 14556:2015(E)6 Apparatus6.1 Testing machineA pendulum impact testing machine, in accordance with ISO 148-2, and instr
43、umented to determine the force-time or force-displacement curve shall be used.Comparisons between the total impact energy, Wt, from the instrumentation and the absorbed energy indicated by the machine dial or encoder, KV, shall be made.NOTE 1 The instrumentation and the machine dial or encoder measu
44、re similar but different quantities. Differences are to be expected (see Reference6).If deviations between KV and Wtexceed 5 J, the following should be investigated:a) friction of the machine;b) calibration of the measuring system;c) software used.6.2 Instrumentation and calibration6.2.1 Traceable m
45、easurementThe equipment used for all calibration measurements shall be traceable to national or international standards of measurement.6.2.2 Force measurementForce measurement is usually achieved by using two active electric resistance strain gauges attached to the standard striker to form a force t
46、ransducer. Suitable designs are shown in Annex A.A full bridge circuit is made by two equally stressed (active) strain gauges bonded to opposite sides of the striker and by two compensating (passive) strain gauges, or by substitute resistors. Compensating strain gauges shall not be attached to any p
47、art of the testing machine which experiences impact or vibration effects.NOTE 1 Alternately, any other instrumentation to form a force transducer, which meets the required performance levels, may be used.The force measuring system (instrumented striker, amplifier, recording system) shall have a resp
48、onse of at least 100 kHz, which corresponds to a rise time, t, of no more than 3,5 s.A simple dynamic assessment of the force measuring chain can be performed by measuring the value of the first inertia peak. By experience, the dynamics of the measuring chain can be considered satisfactory if a stee
49、l V-notch test piece shows an initial peak greater than 8 kN when using an impact velocity between 5 m/s and 5,5 m/s. This is valid if the centres of the active strain gauges are 11 mm to 15 mm away from the striker contact point.The instrumentation of the striker shall be adequate to give the required nominal force range. The instrumented striker shall be designed to minimize its sensitivity to non-symmetric loading.NOTE 2 Experience shows that with the V-notch test piece, nominal impact forces up to 40 kN can occur for most stee
