1、BSI Standards PublicationBS ISO 10771-1:2015Hydraulic fluid power Fatigue pressure testing ofmetal pressure-containingenvelopesPart 1: Test methodBS ISO 10771-1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10771-1:2015.It supersedes BS ISO 10771-1:2002
2、which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/8, Product testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a co
3、ntract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 79400 1ICS 23.100.99Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the aut
4、hority of theStandards Policy and Strategy Committee on 31 July 2015.Amendments issued since publicationDate Text affectedBS ISO 10771-1:2015 ISO 2015Hydraulic fluid power Fatigue pressure testing of metal pressure-containing envelopes Part 1: Test methodTransmissions hydrauliques Essais de fatigue
5、des enveloppes mtalliques sous pression Partie 1: Mthode dessaiINTERNATIONAL STANDARDISO10771-1Second edition2015-08-01Reference numberISO 10771-1:2015(E)BS ISO 10771-1:2015ISO 10771-1:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights res
6、erved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either I
7、SO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 10771-1:2015ISO 10771-1:2015(E)Foreword ivIntroduction v1 Scope . 1
8、2 Normative references 13 Terms and definitions . 14 Test conditions .25 Test equipment and preparation.26 Accuracy 37 Test procedure 37.1 Cyclic pressure test 37.1.1 Test pressure waveform 37.1.2 Pressure test cycle 47.1.3 Number of test cycles . 47.1.4 Test frequency and time period, T147.2 Genera
9、l . 58 Failure criteria 59 Test report . 610 Test declaration . 611 Identification statement (reference to this part of ISO 10771) . 6Annex A (normative) Specific requirements for pumps and motors 7Annex B (normative) Specific requirements for hydraulic cylinders. 8Annex C (normative) Specific requi
10、rements for gas-loaded accumulators 11Annex D (normative) Specific requirements for valves .13Bibliography .14 ISO 2015 All rights reserved iiiContents PageBS ISO 10771-1:2015ISO 10771-1:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national sta
11、ndards bodies (ISO member bodies). The work of preparing 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 or
12、ganizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for it
13、s further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/di
14、rectives).Attention is drawn to the possibility that some of 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. Details of any patent rights identified during the development of the document will be in t
15、he Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions relat
16、ed to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 8, Produ
17、ct testing.This second edition cancels and replaces the first edition (ISO 10771-1:2002), which has been technically revised.ISO 10771 consists of the following parts, under the general title Hydraulic fluid power Fatigue pressure testing of metal pressure-containing envelopes: Part 1: Test method P
18、art 2: Rating methods Technical ReportAnnex A to Annex D form a normative part of this part of ISO 10771.iv ISO 2015 All rights reservedBS ISO 10771-1:2015ISO 10771-1:2015(E)IntroductionIn hydraulic fluid power systems, power is transmitted and controlled under pressure within an enclosed circuit. I
19、t is important for the manufacturer and user of hydraulic components to have information on their global reliability because of the importance of the fatigue failure mode and the relationship this has with the functional safety and service life of such components. This part of ISO 10771 provides a m
20、ethod for fatigue testing the pressure-containing envelope provided by hydraulic components.During operation, components in a system can be subjected to loads that arise from the following: internal pressure; external forces; inertia and gravitational effects; impact or shock; temperature changes or
21、 gradients.The nature of these loads can vary from a single static application to continuously varying amplitudes, repetitive loadings, and even shocks. It is important to know how a component can withstand these loads, but this part of ISO 10771 addresses only the loading due to internal pressure.T
22、here are many ways in which internal pressure loads are imposed upon a component. This part of ISO 10771 considers a broad range of waveforms within prescribed time limits, temperatures, and environmental conditions, and only upon metals. It is expected that these limitations could still provide suf
23、ficient common ground for a method of fatigue pressure testing metal pressure-containing envelopes in hydraulic fluid power components. This method, therefore, provides the system designer with certain information to assist in a selection of components for an application. The system designer still h
24、as the responsibility of considering the other loading characteristics described above and determining how they could affect the components pressure-retaining capability. ISO 2015 All rights reserved vBS ISO 10771-1:2015BS ISO 10771-1:2015Hydraulic fluid power Fatigue pressure testing of metal press
25、ure-containing envelopes Part 1: Test method1 ScopeThis part of ISO 10771 specifies a method of fatigue testing the pressure-containing envelopes of components used in hydraulic fluid power systems under sustained steady cyclic internal pressure loads.This part of ISO 10771 is only applicable to com
26、ponent pressure-containing envelopes that are manufactured from metals, are operated at temperatures that exclude creep and low-temperature embrittlement, are only subjected to pressure-induced stresses, are not subjected to loss of strength due to corrosion or other chemical action, and might inclu
27、de gaskets, seals, and other non-metallic components; however, these are not considered part of the pressure-containing envelope being tested (see 5.7).This part of ISO 10771 does not apply to piping as defined in ISO 4413 (i.e. connectors, hose, tubing, pipe). See ISO 6803 and ISO 6605 for methods
28、of fatigue testing of piping devices.This part of ISO 10771 establishes a general test method that is applicable for many hydraulic fluid power components, but additional requirements or more specific methods that can be required for particular components are contained in the annexes or other standa
29、rds.Test pressure is to be determined by the user. See ISO/TR 10771-2 for a possible rating method.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited a
30、pplies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4413, Hydraulic fluid power General rules and safety requirements for systems and their componentsISO 5598, Fluid power systems and components VocabularyISO 9110-1, Hydraulic fluid po
31、wer Measurement techniques Part 1: General measurement principlesISO 9110-2, Hydraulic fluid power Measurement techniques Part 2: Measurement of average steady-state pressure in a closed conduit3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and
32、the following apply.INTERNATIONAL STANDARD ISO 10771-1:2015(E) ISO 2015 All rights reserved 1BS ISO 10771-1:2015ISO 10771-1:2015(E)3.1upper cyclic test pressurepUminimum value of the highest level of the specified test pressure cycle3.2lower cyclic test pressurepLmaximum value of the lowest level of
33、 the specified test pressure cycle3.3cyclic test pressure rangepdifference between the upper and lower cyclic test pressures during a fatigue test3.4pressure-containing envelopeelements of a component that contain the pressurized hydraulic fluid and the means to secure the elements (bolts, welds, et
34、c.)Note 1 to entry: Gaskets and seals are not considered as part of the pressure-containing envelope.Note 2 to entry: See annexes for component definitions.4 Test conditions4.1 Remove entrapped air from the test component and circuit before starting each test.4.2 The temperature of the hydraulic flu
35、id in the component shall be in the range of 15 C to 80 C. The temperature of the component shall be a minimum of 15 C.5 Test equipment and preparation5.1 The test equipment and circuit shall be able to generate and repeat the pressure cycle as specified in 7.1.5.2 Pressure transducer(s) shall be mo
36、unted directly into the test component, or as near as possible, so as to record the internal conditions applied to the component. Any restrictions between the transducers and the pressure-containing envelope being tested should be avoided.5.3 Any non-corrosive hydraulic fluid that has a kinematic vi
37、scosity not greater than 60 mm2/s at the test temperature shall be used as the pressurizing medium.5.4 Different pressures shall be applied to separate portions of the test components as dictated by design specifications.5.5 It shall be verified that the ratio of induced stress to pressure, under st
38、atic loading conditions, is also attained at the test cycling rate, especially when pressures have to penetrate between close-fitting parts, large components are tested, and hysteresis in joints can significantly affect stresses.Strain gauges can be used to verify this ratio and, if used, should be
39、located externally in an area of high strain.2 ISO 2015 All rights reservedBS ISO 10771-1:2015ISO 10771-1:2015(E)5.6 It is permissible to make modifications to the test samples to facilitate cyclic or burst tests, provided that such modifications do not increase the pressure capabilities of the pres
40、sure-containing envelope.5.7 It is permissible to replace gaskets and seals that fail during the test, as long as preloads in stressed elements are the same after reassembly as they were before disassembly. It is possible that fastener preloads can decrease during fatigue testing. Fastener preloads
41、should be set to this reduced level when seals or gaskets are replaced.5.8 Safety procedures shall be followed in order to protect personnel and test equipment during the test as specified in ISO 4413.6 Accuracy6.1 Instrumentation shall be accurate to within the following limits: pressure: 1,0 % of
42、the upper cyclic test pressure; strain: 1 % of the value obtained at the upper cyclic test pressure; time: 0,002 s resolution; temperature: 2 C.6.2 Use pressure transducers, amplifiers, and recording devices with a combined system frequency response such that in the frequency range 0 kHz to 2 kHz, t
43、he amplitude ratio is within 0 dB and 3 dB.6.3 Instruments and procedures shall conform to ISO 9110-1 and ISO 9110-2.7 Test procedure7.1 Cyclic pressure test7.1.1 Test pressure waveformThe test pressure waveform shall achieve the upper and lower levels for the time periods as specified in 7.1.2. The
44、 wave form is not specified and may be of any shape.NOTE For the purposes of illustration only, a typical test pressure waveform is shown in Figure 1. ISO 2015 All rights reserved 3BS ISO 10771-1:2015ISO 10771-1:2015(E)12Key1 actual test pressure2 test period = T = 1/test frequency = 1/f = TR+ T1+ T
45、F+ T2X timeY pressureFigure 1 Test pressure waveform7.1.2 Pressure test cyclea) Upper cyclic test pressure (pU)The actual test pressure shall equal, or exceed, the upper cyclic test pressure for a time period T1equal to or greater than 0,3T.b) Time period of pressure rise (TR)The actual test pressur
46、e shall rise to the upper cyclic test pressure within the time period TRso that04 061,TT TT+()Rc) Lower cyclic test pressure (pL)The lower cyclic test pressure shall not exceed 5 % of the upper cyclic test pressure unless specified otherwise in the annexes. The actual test pressure shall not exceed
47、the lower cyclic test pressure in the time period in the cycle T2, where T2is given by09 1112 1,TT T7.1.3 Number of test cyclesSelect the number of test cycles required in the range of 105to 107.7.1.4 Test frequency and time period, T1Cycle the test pressure at the selected frequency of: f = 1/T.The
48、 fatigue life of hydraulic components depends upon the time period, T1, of the pressure variations at a given pressure amplitude. Consequently, the results of the test on a component at a given time 4 ISO 2015 All rights reservedBS ISO 10771-1:2015ISO 10771-1:2015(E)period cannot be used to predict
49、the number of cycles that the component will successfully withstand at a different period. For a given test pressure, frequencies ( f) of 3 Hz or time periods of T1 100 ms are to be used unless there is satisfactory experience of testing at a higher frequency. Such experience should be stated in the test report.7.2 General7.2.1 Inspect all of the test components, using non-destructive methods, in order to verify conformity to the manufacturing specification.7.2.2 If required, place met
