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1、BS EN ISO 148-2:2008 ICS 77.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Metallic materials - Charpy pendulum impact test Part 2: Verification of test machines (ISO 148-2:2008) ing This British Standard was published under the authority of the Standa
2、rds Policy and Strategy Committee on 31 March 2009 BSI 2009 ISBN 978 0 580 55467 4 Amendments/corrigenda issued since publication DateComments BS EN ISO 148-2:2008 National foreword This British Standard is the UK implementation of EN ISO Together with BS EN ISO 148-3:2008 it supersedes BS EN 10045-
3、2:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/NFE/4/4, 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 pr
4、ovisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. 148-2:2008. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 148-2 December 2008 ICS 77.040.10Supersedes EN 10045-2:1992 English Versio
5、n Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines (ISO 148-2:2008) Matriaux mtalliques - Essai de flexion par choc sur prouvette Charpy - Partie 2: Vrification des machines dessai (mouton-pendule) (ISO 148-2:2008) Metallische Werkstoffe - Kerbschlagbiegeve
6、rsuch nach Charpy - 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 European Standard the stat
7、us 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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A
8、 version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republi
9、c, Denmark, 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 STANDARDIZATION COMIT EUROPEN DE NO
10、RMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 148-2:2008: E EN ISO 148-2:2008 (E) 3 Foreword This document (EN ISO 148-2:2008
11、) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in collaboration with Technical Committee ECISS/TC 1 “Steel - Mechanical testing“ the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publica
12、tion of an identical text or by endorsement, at the latest by June 2009, and conflicting national standards shall be withdrawn at the latest by 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 th
13、is 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Sta
14、ndard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom
15、. 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 148-2:2008 ISO 148-2:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 2 3 Terms and definitions. 2
16、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 6 6.4 Pendulum. 7 6.5 Anv
17、il 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 repeatability. 13 8 Frequenc
18、y 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 Annex B (informative) Measuremen
19、t 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 148-2:2008 ISO 148-2:2008(E) iv ISO 2008 All
20、rights reserved Foreword ISO (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 technical committees. Each member body interested in a subje
21、ct 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 with the International Electrotechnical Commission (IEC
22、) 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 International Standards. Draft International Standards adopted by the technical committe
23、es 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 the elements of this document may be the subject of patent rights. ISO shall not be h
24、eld responsible for identifying any or all such patent rights. ISO 148-2 was prepared by Technical Committee 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
25、), 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 method Part 2: Verification of testing machines Part 3: Preparation and characterization of Charpy V-notch test pieces for indirect ver
26、ification of pendulum impact machines BS EN ISO 148-2:2008 ISO 148-2:2008(E) ISO 2008 All rights reserved v Introduction The suitability of a pendulum impact testing machine for acceptance testing of metallic materials has usually been based on a calibration of its scale and verification of complian
27、ce 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 procedure for evaluation of machines had the distinct advantage of req
28、uiring 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 acceptance tests. However, sometimes two machines that had been evalu
29、ated 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 commercially important when values obtained using one machine met the ma
30、terial 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 material sold to them must be indirectly verified by testing refer
31、ence 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 148-2:2008 BS EN ISO 148-2:2008 INTERNATIONAL STANDARD ISO 148-2:2008(E) ISO 2008 A
32、ll rights reserved 1 Metallic 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 pendulum-type impact testing machines. It is applicable to machines with 2 mm or 8 mm strikers used for
33、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 machines used for industrial, general or research laboratory testing of metallic materials in accorda
34、nce 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 machines are found in ISO 148-3. This part of ISO 148 describes two methods of verification. a) The dir
35、ect 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 verification and calibration are traceable to national standards. Direct methods are used when a machine is bein
36、g 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 scale. A pendulum impact testing machine is not in compliance with this part of ISO 148 until it has been
37、 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 into account the total energy absorbed in fracturing the test piece using an indirect method. This total
38、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 initial position. NOTE Internal energy losses are due to air resistance, friction of the bearings of the
39、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 suitable measuring methods and apparatus have been developed. BS EN ISO 148-2:2008 ISO 148-2:2008(E) 2 I
40、SO 2008 All rights reserved 2 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
41、. ISO 148-1, Metallic materials 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 purpo
42、ses of this document, the following 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 forc
43、e of the strike 3.1.2 base that 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
44、 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
45、the pendulum, the vertical edge of the striker meets the upper horizontal plane of a test piece of half standard height (i.e. 5 mm) or equivalent gauge bar resting on the test piece supports See Figure 4. 3.1.5 industrial machine pendulum impact machine used for industrial, general, or most research
46、-laboratory testing of metallic materials NOTE 1 These machines are not used to establish reference values. NOTE 2 Industrial machines are verified using the procedures described in this part of ISO 148. 3.1.6 reference machine pendulum impact testing machine used to determine certified values for b
47、atches of reference test pieces BS EN ISO 148-2:2008 ISO 148-2:2008(E) ISO 2008 All rights reserved 3 3.1.7 striker portion of the pendulum that contacts the test piece NOTE The edge that actually contacts the test piece has a radius of 2 mm (the 2 mm striker) or a radius of 8 mm (the 8 mm striker).
48、 See Figure 2. 3.1.8 test piece supports portion of the machine that serves to properly position the test piece for impact with respect to the centre of percussion of the pendulum, the striker and the anvils See Figures 2 and 3. 3.2 Definitions pertaining to energy 3.2.1 total absorbed energy KT tot
49、al absorbed energy required to break a test piece with a pendulum impact testing machine, which is not corrected for any losses of energy NOTE It is equal to the difference in the potential energy from the starting position of the pendulum to the end of the first half swing during which the test piece is broken (see 6.3). 3.2.2 initial potential energy potential energy KP difference between the potential energy of the pendulum hammer prior to its release for the impact test, and the potential energy of the pendulum ham
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