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1、Reference number ISO 15363:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 15363 First edition 2000-08-01 Metallic materials Tube ring hydraulic pressure test Matriaux mtalliques Essai dexpansion hydraulique sur anneau tubulaire Copyright International Organization for Standardization Provided by IHS un
2、der license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy,
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5、nsure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or uti
6、lized 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 in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 F
7、ax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo r
8、eproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) ISO 2000 All rights reservediii ContentsPage Foreword.iv 1Scope 1 2Symbols1 3Principle1 4Apparatus.2 5Test ring3 6Test procedure.4 7Hoop strength evaluation .6 8Test report7 Annex A (informative) Proof and reduced s
9、ection testing8 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) iv ISO 2000 A
10、ll 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 su
11、bject 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 (
12、IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter
13、national 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent right
14、s. International Standard ISO 15363 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 2, Ductility testing. Annex A of this International Standard is for information only. Copyright International Organization for Standardization Provided by IHS under licen
15、se with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDISO 15363:2000(E) ISO 2000 All rights reserved1 Metallic materials Tube ring hydraulic pressure test 1Scope T
16、his International Standard specifies the ring hydraulic pressure test for metallic tubes. It is generally applied to tubes with an outside diameter greater than 120 mm and outside diameter to thickness ratio of not less than 20. The objective of this test is to ascertain the value of the hoop stress
17、 required to produce a specified total circumferential (hoop) strain. 2Symbols Symbols and corresponding designations are given in Table 1. Table 1 Symbols and designations SymbolDesignationUnit aaMeasured tube test ring thicknessmm AtSpecified total circumferential strain% dbMeasured outside diamet
18、er of the tube test ringmm lLength of tube test ringmm pHydrostatic pressure to produce the specified total circumferential strain N/mm2 RAtHoop strength at the specified total strain N/mm2 a The symbol T is also used for this parameter in standards for steel tubes. b The symbol D is also used for t
19、his parameter in standards for steel tubes. 3Principle Unrestrained expansion of the test ring between two platens, under internal hydraulic pressure; the outer circumference of the tube is the effective test piece gauge length. The test is carried out on a test piece taken from a welded or seamless
20、 tube of thickness up to a limit dependent upon the capacity of the machine and the strength of the tube (see Figure 1). All sharp edges are removed from product machined surfaces before testing. Where the hydraulic pressure required to produce the specified circumferential strain exceeds the capaci
21、ty of the test machine, modified tests may be carried out as described in annex A. The test is specified when a measure of the hoop strength is required which is not influenced by cold forming and residual stress introduced when flattening a standard tensile test piece. The standard tensile test is
22、necessary however, when tensile strength and elongation measurements are required. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permi
23、tted without license from IHS -,-,- ISO 15363:2000(E) 2 ISO 2000 All rights reserved Dimensions in millimetres a Tolerance on l: ? 0,25 mm; l is commonly taken as 76 mm. b Maximum deviation from normal. c Both faces to be machined parrallel with fine turned or ground finish. d Measured outside diame
24、ter of the tube test ring. Figure 1 Test ring dimensions and tolerances 4Apparatus 4.1The testing machine shall be capable of allowing the test ring to expand freely without imposing any end restraint. This shall be achieved by leaving a small gap between the test piece and the top platen. Pressure
25、loss during testing shall be prevented by the use of a flexible seal. A typical testing machine is shown schematically in Figure 2. 4.2To reduce to a minimum any friction between the test piece, platens and inner die, the platens shall be parallel and have a fine turned or ground finish. Prior to ea
26、ch test, friction at the contact surfaces shall be further minimized either by the use of a lubricant, e.g. graphited grease, or by the use of PTFE (polytetrafluorethylene) sheet. The platens shall be inspected regularly and any ridges that develop shall be removed. 4.3Stress shall be applied to the
27、 test ring by means of a pressurized fluid. Provision shall be made to remove any air in the system through a bleed line. Warning When carrying out the test, precautions should be taken for ensuring the safety of the operator. Copyright International Organization for Standardization Provided by IHS
28、under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) ISO 2000 All rights reserved3 Key 1Circumferential measuring device e.g. steel tape or roller chain 2I
29、nner die 3Top platen 4Small gap 5Test ring 6Rubber seal or gasket 7Pressurizing fluid 8Bottom platen 9Clamping force Figure 2 Schematic diagram of testing machine (with installed test ring) 5Test ring 5.1Shape and position 5.1.1Prior to separation from the main body of the tube the test ring shall b
30、e marked with a unique identity. 5.1.2The test ring may be prepared from an oversize flame cut sample. Final preparation shall be by a cold machining process to ensure removal of any heat affected zones. The machined edges shall have a fine turned or ground finish and be free from burrs. 5.1.3The di
31、mensions and tolerances for the test piece are given in Figure 1. The machined edges shall be parallel and normal to the axis of the tube to within 0,15 mm measured across the diameter. 5.2Determination of dimensions 5.2.1The outside diameter of the test ring shall be calculated from measurement of
32、the tube circumference, e.g. using a flexible steel tape. The maximum tolerance on the accuracy of this measurement shall be?1 mm. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007
33、 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) 4 ISO 2000 All rights reserved 5.2.2The wall thickness shall be determined by calculating the mean of eight measurements taken at approximately 45 intervals around the test piece, excluding the weld
34、 region of welded tubes (see Figure 3). The measuring device shall be capable of measuring thickness to an accuracy greater than?0,025 mm. 5.2.3All tube diameter and thickness measurements of the test ring shall be fully documented. a Adjacent to the weld. Figure 3 Wall thickness measurement positio
35、ns 6Test procedure 6.1The test procedure consists of applying pressure and measuring circumferential extension. 6.2Circumferential extension of the test ring shall be measured during pressurization as follows. The equipment for measuring the change of circumference, e.g. steel tape or roller chain e
36、xtensometer, shall be wrapped around the test ring perimeter at the mid-point, crossing at the weld. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction o
37、r networking permitted without license from IHS -,-,- ISO 15363:2000(E) ISO 2000 All rights reserved5 An example of the use of a steel tape is shown in Figure 4. The separation between the two parallel portions of the measuring device shall be between 1,5 mm and 3 mm. Key 1Tube under test 2Measuring
38、 device, e.g. steel tape Figure 4 Measuring device position for extension measurement When a steel tape is used friction shall be minimized by coating both the tape and test ring circumference with a suitable lubricant. Change in circumference shall be measured by a suitable mechanical or electrical
39、 device accurate to within?0,25 mm. 6.3The equipment for measuring the increase in circumference shall be wrapped around the test ring before application of the internal pressure. 6.4The tolerance for the measurement of internal pressure shall be within?1 %. Accuracy of the pressure measurement devi
40、ce shall be verified, e.g. by comparison with dead weight test equipment, at the commencement of a sequence of testing and not less than once per year during the testing period. 6.5The rate of strain shall not exceed 0,2 % min?1. 6.6The pressure and circumferential extension output signals shall be
41、recorded, for example on an X-Y plotter, and related to the test piece identity. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitt
42、ed without license from IHS -,-,- ISO 15363:2000(E) 6 ISO 2000 All rights reserved 7Hoop strength evaluation 7.1A typical test pressure-circumferential extension record is shown in Figure 5. 7.2The pressure p corresponding to the specified total circumferential strain shall be determined from the te
43、st record. 7.3For tubes where D/dW20, the hoop strength at the specified total strain shall be calculated from the formula t 2 A pd R a ? NOTE 1For tubes with d/a ? 20, the hoop strength calculated from this formula becomes increasingly inaccurate and quantitative results should be used with caution
44、. Factors such as strain hardening could have a significant effect on the validity of the calculated strength. NOTE 2The specified total circumferential strain is calculated from the circumferential extension divided by the original test ring circumference. Figure 5 Typical pressure/extension test r
45、ecord Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) ISO 2000 All rights res
46、erved7 8Test report The test report shall contain at least the following information: a)reference to this International Standard, i.e. ISO 15363; b)identification of test ring, e.g. cast No./tube No./identification No.; c)material specification, if known; d)diameter and wall thickness of the tube; e
47、)length of the tube test ring; f)calculated hoop strength at specified total circumferential strain; g)reference to an alternative test method used, when appropriate (see annex A). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
48、 Standards 1/9972545001 Not for Resale, 04/22/2007 09:20:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15363:2000(E) 8 ISO 2000 All rights reserved Annex A (informative) Proof and reduced section testing A.1 Proof testing This method may be used where the stress necessary to produce the specified circumferential