ISO-12135-2002.pdf
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1、 Reference number ISO 12135:2002(E) ISO 2002 INTERNATIONAL STANDARD ISO 12135 First edition 2002-12-01 Metallic materials Unified method of test for the determination of quasistatic fracture toughness Matriaux mtalliques Mthode unifie dessai pour la dtermination de la tnacit quasi statique ISO 12135
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5、w. ISO 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body i
6、n the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 All rights reserved ISO 12135:2002(E) ISO 2002 All rights reserved iii Contents Page Foreword.
7、vii 1 Scope 1 2 Normative references 1 3 Terms and definitions. 1 4 Symbols and designations. 3 5 General requirements. 5 6 Determination of fracture toughness for stable and unstable crack extension. 28 7 Determination of resistance curves -a and J-a and initiation toughness 0,2BL and J0,2BL and i
8、and Ji for stable crack extension . 36 8 Test report 42 Annex A (informative) Determination of i and Ji 47 Annex B (normative) Crack plane orientation . 52 Annex C (informative) Example test reports54 Annex D (normative) Stress intensity factor coefficients and compliance relationships 63 displaceme
9、nt VM1. 65 Annex E (informative) Measurement of load-line displacement q in the three-point bend test 68 Annex F (informative) Derivation of pop-in equations 73 Annex G (informative) Analytical methods for the determination of Vp and Up. 75 Annex H (informative) Guidelines for single-specimen method
10、s 77 Annex I (normative) Power-law fits to crack extension data 39 91 Bibliography 92 ISO 12135:2002(E) iv ISO 2002 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
11、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, governmental and non-governmental, in liaiso
12、n 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 with the rules given in the ISO/IEC Directives, Part 3. The main task of tec
13、hnical 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 approval by at least 75 % of the member bodies casting a vote. Attention is dra
14、wn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12135 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC
15、 4, Toughness testing Fracture (F), Pendulum (P), Tear (T). Annexes B, D and I form a normative part of this International Standard. Annexes A, C, E, F, G and H are for information only. -,-,- INTERNATIONAL STANDARD ISO 12135:2002(E) ISO 2002 All rights reserved 1 Metallic materials Unified method o
16、f test for the determination of quasistatic fracture toughness 1 Scope This International Standard specifies methods for determining fracture toughness in terms of K, , J and R-curves for homogeneous metallic materials subjected to quasistatic loading. Specimens are notched, precracked by fatigue an
17、d tested under slowly increasing displacement. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these public
18、ations do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to app
19、lies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 3785:1976, Steel Designation of test piece axes ISO 7500-1:1), Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration
20、 of the force-measuring system ISO 9513:1999, Metallic materials Calibration of extensometers used in uniaxial testing 3 Terms and definitions For the purposes of this International Standard the following terms and definitions apply. 3.1 stress intensity factor K magnitude of the elastic stress-fiel
21、d singularity for a homogeneous, linear-elastic body NOTE The stress intensity factor is a function of applied force, crack length, specimen size and specimen geometry. 3.2 crack-tip opening displacement relative displacement of the crack surfaces normal to the original (undeformed) crack plane at t
22、he tip of the fatigue precrack 1) To be published. (Revision of ISO 7500-1:1999) ISO 12135:2002(E) 2 ISO 2002 All rights reserved 3.3 J-integral line or surface integral that encloses the crack front from one crack surface to the other and characterizes the local stress-strain field at the crack tip
23、 3.4 J loading parameter, equivalent to the J-integral, specific values of which, experimentally determined by this method of test (Jc, Ji, Ju,), characterize fracture toughness under conditions of non-negligible crack-tip plasticity 3.5 stable crack extension crack extension which stops or would st
24、op when the applied displacement is held constant as a test progresses under displacement control 3.6 unstable crack extension abrupt crack extension occurring with or without prior stable crack extension 3.7 pop-in abrupt discontinuity in the force versus displacement record, featured as a sudden i
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