BS-ISO-19819-2004.pdf
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1、BRITISH STANDARD BS ISO 19819:2004 Metallic materials Tensile testing in liquid helium ICS 74.040.10 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 19819:2004 This British Standard was published under the authority of the Standards
2、 Policy and Strategy Committee on 24 November 2004 BSI 24 November 2004 ISBN 0 580 44839 8 National foreword This British Standard reproduces verbatim ISO 19819:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4,
3、 Mechanical testing of metals, to Subcommittee ISE/NFE/4/1, Uniaxial testing of metals, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publicat
4、ions referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necess
5、ary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp
6、retation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to 12, an inside ba
7、ck cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference n
8、umber ISO 19819:2004(E) OSI 4002 INTERNATIONAL STANDARD ISO 19819 First edition 2004-08-01 Metallic materials Tensile testing in liquid helium Matriaux mtalliques Essai de traction dans lhlium liquide BS ISO 19819:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006, U
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12、crteiraat ta the serddaig sleb nevwo. ISO 4002 All irthgs erse.devr lnUeto sswrehise specified, on trap fo this lbupictaion maeb y cudorperro de tuilizi den yna form ro na ybm ynae,s lecetrinoc ro mecinahcal, inclidung tohpcoiypodna gn micrfoilm, wittuoh repmissii non writign from ietI rehSa Ot tsse
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14、: sheffieldun sheffieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:91891 O4002(E) I SO 4002 All irthgs ersedevr iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Symbols and designations.2 5 Principle.3 6 Apparatu
15、s.4 6.1 Testing machine4 6.2 Cryostats and support apparatus .5 6.3 Liquid-level indicators5 6.4 Extensometer 5 7 Specimens .6 7.1 General.6 7.2 Standard round bar specimen.6 7.3 Alternatives6 7.4 Sub-size specimens6 7.5 Sampling6 8 Test conditions7 8.1 Specimen installation.7 8.2 Cooling procedure
16、7 8.3 Rate of testing .7 9 Procedure.8 9.1 Determination of original cross-sectional area (So)8 9.2 Marking of the original gauge length (Lo) 8 9.3 Determination of percentage elongation after fracture (A).9 9.4 Determination of the 0,2 % proof strength, non-proportional extension (Rp0,2)9 9.5 Disco
17、ntinuous yielding strength (Ri)9 9.6 Tensile strength (Rm)9 9.7 Reduction of area (Z)9 10 Test report9 Annex A (informative) Examples of specimens for tensile testing in liquid helium10 Bibliography .12 BS ISO 19819:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006,
18、 Uncontrolled Copy, (c) BSI IS:91891 O4002(E) iv I SO 4002 All irthgs ersedevr 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 I
19、SO 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 work. ISO collaborates
20、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 International Standards.
21、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 of the elements of this d
22、ocument may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 19819 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 1, Uniaxial testing. BS ISO 19819:2004 Licensed Copy: sheffieldun shef
23、fieldun, na, Sun Nov 26 11:40:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:91891 O4002(E) I SO 4002 All irthgs ersedevr v Introduction The force-time and force-extension records for alloys tested in liquid helium using displacement control are serrated. Serrations are formed by repeated bursts o
24、f unstable plastic flow and arrests. The unstable plastic flow (discontinuous yielding) is a free-running process occurring in localized regions of the parallel length at higher rates than nominal strain rates with internal specimen heating. Examples of serrated stress-strain curves for a typical au
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