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1、a Date: 19 November 2008 Origin: International Latest date for receipt of comments: 28 February 2009 Project no.: 2006/01527 Responsible committee: ISE/NFE/4/4 Toughness testing Interested committees: Title: Draft BS ISO 26843 Metallic materials - Measurement of fracture toughness of steels at impac
2、t loading rates using precracked Charpy specimens Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (c
3、ontact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 28 February 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement
4、 will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic
5、 circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email . British, International and foreign standards are also available from BSI Customer Service
6、s. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the Briti
7、sh Standards Online Service on the BSI web site http:/. Direct tel: 020 8996 7261 Responsible Committee Secretary: Mr A Price (BSI) E-mail: Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/301
8、51326 DC Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are invited and will assist in the
9、preparation of the consequent standard. Comments submitted will be reviewed by the relevant BSI committee before sending the consensus UK vote and comments to the international secretariat, which will then decide appropriate action on the draft and the comments received. If the international standar
10、d is approved, it is possible the text will be published as an identical British Standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive e
11、fficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with
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14、3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector
15、to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Co
16、rporation. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
17、 IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. RECIPIENTS
18、 OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. DRAFT INTERNATIONAL STANDARD ISO/DIS 26843 International Organization for Standardization, 2008 INTERNATIONAL ORGANIZATION FOR STANDA
19、RDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ISO/TC 164/SC 4 Voting begins on: 2008-10-20 Secretariat: ANSI Voting terminates on: 2009-03-20 Metallic materials Measurement of fracture toughness of steels at impact loading rates using precracked Charpy specimens Matriaux mtalliques Mesure d
20、e la tnacit la rupture dprouvettes Charpy prfissures en acier soumises des charges dynamiques ICS 77.040.10 In accordance with the provisions of Council Resolution 15/1993 this document is circulated in the English language only. Conformment aux dispositions de la Rsolution du Conseil 15/1993, ce do
21、cument est distribu en version anglaise seulement. To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage. Pour acclrer la distribution, le prsent document
22、est distribu tel quil est parvenu du secrtariat du comit. Le travail de rdaction et de composition de texte sera effectu au Secrtariat central de lISO au stade de publication. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI ISO/DIS 268
23、43 ii ISO 2008 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the
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28、ice Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Reproduction may be subject to royalty payments or a licensing agreement. Violators may be prosecuted. Licensed Copy: London South Bank University, South Bank University, 31/01/
29、2009 03:15, Uncontrolled Copy, (c) BSI ISO/DIS 26843 ISO 2008 All rights reserved iii Contents Page Foreword iv Introductioniv 1 Scope1 2 Normative references1 3 Symbols and definitions.2 4 Principle3 5 Test specimens5 6 Testing machines 6 7 Test procedures and measurements.6 7.1 Key data7 7.2 Impac
30、t velocity.7 7.3 Time to fracture .7 7.4 Multiple specimen tests7 7.5 Single specimen tests.7 7.6 Crack length measurements after testing.7 7.6.1 Five-point average method.8 7.6.2 Area average method9 8 Evaluation of fracture mechanics parameters .10 9 Test report10 Annex A (informative) Test machin
31、es suitable for each test procedure.12 Annex B (informative) Estimation of strain rate.13 Annex C (normative) Dynamic evaluation of fracture toughness14 Annex D (normative) Determination of resistance curves at impact loading rates by multiple specimen methods19 Annex E (normative) Estimation of J-
32、a R-curves by single specimen methods21 Annex F (normative) Determination of characteristic fracture toughness values J0,2Bd or 0,2Bd25 Annex G (normative) Validity criteria27 Annex H (normative) Fracture mechanics parameters.28 Bibliography30 Licensed Copy: London South Bank University, South Bank
33、University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI ISO/DIS 26843 iv ISO 2008 All 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 normal
34、ly 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, governmental and non-governmental, in liaison with ISO, also take part in the
35、 work. ISO collaborates closely with the International Electrotechnical Commission (IEC) 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 I
36、nternational Standards. Draft International Standards adopted by the technical committees 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 o
37、f 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 26843 was prepared by Technical Committee ISO/TC 164, Mechanical Testing, Subcommittee SC 4F, Fracture. This second/third/. edition cancels and re
38、places the first/second/. edition (), clause(s) / subclause(s) / table(s) / figure(s) / annex(es) of which has / have been technically revised. Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI ISO/DIS 26843 ISO 2008 All rights reserved
39、v Introduction This standard is a sequel to ISO 14556, Steel Charpy-V pendulum impact test Instrumented test method, and was derived from a draft procedure prepared by the Working Party European Standards on Instrumented Precracked Charpy Testing of the European Structural Integrity Society ESIS Tec
40、hnical Subcommittee on Dynamic Testing at Intermediate Strain Rates (TC5). Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI Licensed Copy: London South Bank University, South Bank University, 31/01/2009 03:15, Uncontrolled Copy, (c) BSI
41、 DRAFT INTERNATIONAL STANDARD ISO/DIS 26843 ISO 2008 All rights reserved 1 1 Scope This standard specifies requirements for performing and evaluating instrumented precracked Charpy impact tests on steels using a fracture mechanics approach. Minimum requirements are given for measurement and recordin
42、g equipment such that similar sensitivity and comparable measurements are achieved. This standard may be applied to other metallic materials by agreement. Dynamic fracture mechanics properties determined using this standard are comparable to conventional large-scale fracture mechanics results when t
43、he corresponding validity criteria are met. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless the values obtained can be used in research and development of materials, in quality control and service evaluation and to establish the variation of proper
44、ties with test temperature under impact loading rates. Fracture toughness properties determined through the use of this standard may differ from values measured at quasistatic loading rates. Indeed, an increase in loading rate causes a decrease in fracture toughness when tests are performed in the b
45、rittle or ductile-to-brittle regimes; the opposite is observed (i.e., increase in fracture toughness) in the fully ductile regime. More information on the dependence of fracture toughness on loading (or strain) rate is given in ref. 1. In addition, it is generally acknowledged that fracture toughnes
46、s also depends on test temperature. For these reason, the user is required to report the actual test temperature and loading rate for each test performed. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard.
47、All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards listed below. Members of ISO and CEN maintain registers of current international standards. ISO 148-1 Metallic ma
48、terials - Charpy pendulum impact test - Part 1: Test method ISO 148-2 Metallic materials - Charpy pendulum impact test - Part 2: Verification of the testing machine ISO 3785 Metallic materials - Designation of test specimen axes in relation to product texture ISO 12135 Metallic materials - Unified m
49、ethod of test for the determination of quasi-static fracture toughness ISO 14556 Steel - Charpy-V pendulum impact test - Instrumented test method ESIS Procedure P7-00 Procedure for Dynamic Tensile Tests ASTM E1820 Standard Test Method for Measurement of Fracture Toughness ASTM E 1921 Standard Test Method for Determination of