ISO-204-1997.pdf
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1、INTERNATIONAL STANDARD IS0 204 First edition 1997-03-I 5 Metallic materials - Uninterrupted uniaxial creep testing in tension - Method of test Matkiaux mktalliques - Essai ininterrompu de fluage uniaxial en traction - M a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright Internat
2、ional Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 02:45:21 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 IS0 204:1997(E) Foreword IS0 (the International Organizatio
3、n for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has
4、 the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft
5、 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. International Standard IS0 204 was prepared by Technical Committee lSO/TC 164,
6、 Mechanical testing of metals, Subcommittee SC 1, hiaxial testing. Annex A of this International Standard is for information only III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2
7、007 02:45:21 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 204:1997(E) Metallic materials - Uninterrupted uniaxial creep testing in tension - Method of test 1 Scope This International Standard specifies an uninterrupted creep test (however
8、, see 7.3) and defines the mechanical properties of metallic materials which can be determined, in particular the creep elongation and the time of creep rupture, at a specified temperature. 2 Normative references The following standards contain provisions which, through reference in this text, const
9、itute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of
10、the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 286-2: 1988, IS0 system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts. IS0 7500-2:1996, Metallic materials - Verificat
11、ion of static uniaxial testing machine - Part 2: Tensile creep testing machines - Verification of the applied load. IS0 9513:- I), Metallic materials - Verification of extensometers used in uniaxial testing. 3 Definitions For the purposes of this International Standard, the following definitions app
12、ly. 3.1 reference length, L,: Base length used for the calculation of elongation. NOTE - Examples of reference lengths for several types of test pieces are given in figure 1. Distinction is made between the reference lengths defined in 3.1 .I and 3.1.2. 3.1.1 original reference length, Lro: Referenc
13、e length determined at ambient temperature before the test. L, shall not exceed the parallel length L, (3.4) by more than 10 % L, for circular test pieces, or by more than 15 % L, for square or rectangular test pieces. I) To be published. (Revision of IS0 9513:1989) 1 Copyright International Organiz
14、ation for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/21/2007 02:45:21 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 204:1997(E) IS0 3.1.2 final reference length, L,: Reference length determi
15、ned at ambient temperature after rupture, the two pieces having been carefully fitted back together so that their axes lie in a straight line. 3.2 original gauge length, L,: Length between gauge length marks on the piece measured at ambient temperature before the test. 3.3 final gauge length after r
16、upture, L,: Length between gauge marks on the test piece measured after rupture, at ambient temperature, the two pieces having been carefully fitted back together so that their axes lies in a straight line. 3.4 parallel length, L,: Length of the parallel reduced section of the test piece. 3.5 extens
17、ometer gauge length, L,: Distance between the measuring points of extensometer; shall be as near as possible to the reference length. 3.6 original cross-sectional area, s,: Cross-sectional area of the parallel length determined at ambient temperature prior to testing. 3.7 cross-sectional area after
18、rupture, S,: Minimum cross-sectional area of the parallel length determined at ambient temperature after rupture, the two pieces having been carefully fitted back together so that their axes lie in a straight line. 3.8 initial stress, 0,: Applied force divided by the original cross-sectional area S,
19、 of the test piece. 3.9 elongation: Increase of the reference length at any moment during the test. Distinction is made between the elongations defined in 3.9.1 and 3.9.2. 3.9.1 percentage creep elongation, Af: At a given moment t during the test, the increase in the reference length between this mo
20、ment and the zero moment (A depth 0.15 mm) -7 lie where n is preferentially equal 65. Figure 1 - Examples of test pieces in relation with definitions in table 1 (The shape of the grip ends is only given as information) The extensometer gauge length shall not be less than 10 mm. The extensometer shal
21、l be capable of measuring the average of the elongation on opposite sides of the test piece. When the elongation is measured with an extensometer attached to the grip ends of the test piece, the ends shall be of such shape and size that it can be assumed that the observed elongation has occurred com
22、pletely within the reference length of the test piece. The increase in the extensometer gauge length is considered to be the increase in the reference length 6.3 Heating device 6.3.1 Permissible temperature deviations The heating device for the test piece shall be such that the test piece can be hea
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