1、BRITISH STANDARD AEROSPACE SERIES BS ISO 14623:2003 Space systems Pressure vessels and pressurized structures Design and operation ICS 49.140 BS ISO 14623:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 January 2004 BSI 16 January 200
2、4 ISBN 0 580 43256 4 National foreword This British Standard reproduces verbatim ISO 14623:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations, which has the responsibility to: A list of
3、 organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondenc
4、e 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 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itsel
5、f confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and pr
6、omulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 30, an inside back cover and a back cover The BSI copyright notice displayed in this document indicates when the document was last issue
7、d. Amendments issued since publication Amd. No. Date Comments Reference number ISO 14623:2003(E) ISO 2003INTERNATIONAL STANDARD ISO 14623 First edition 2003-12-01 Space systems Pressure vessels and pressurized structures Design and operation Systmes spatiaux Rservoirs et structures sous pression Con
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13、l irhgts seredevr iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Terms and definitions. 1 3 General requirements . 8 3.1 Introduction . 8 3.2 System analysis requirements 8 3.3 General design requirements 8 3.4 Composite overwrapped pressure vessel-specific design requirements 14 3.5 Materi
14、al requirements. 16 3.6 Fabrication and process control requirements . 18 3.7 Quality assurance requirements . 18 3.8 Operation and maintenance requirements. 20 3.9 Reactivation requirements. 22 3.10 Service life extension requirements . 22 4 Specific requirements. 22 4.1 General. 22 4.2 Pressure ve
15、ssels. 22 4.3 Pressurized structures . 28 BSISO14623:2003ISO 14623:2003(E) iv I SO 3002 All irhgts seredevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is no
16、rmally 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 liaison with ISO, also take part in
17、 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 2. The main task of technical committees is to prepa
18、re 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 drawn to the possibility that so
19、me 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. ISO 14623 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. BSISO14623
20、:2003ISO 14623:2003(E) I SO 3002 All irhgts seredevr vIntroduction From the beginning of the space age, hazard control has been a prime consideration in manned or unmanned flights in outer space. The rapid development of space activities and their associated technologies required the implementation
21、of ever-increasing amounts of energy sources. Space activities can be hazardous and could cause harm to people and damage to public and private property and the environment. It is therefore necessary to develop methods and tools that can analyse hazardous situations and provide realistic recommendat
22、ions in terms of safety and safety risk control. Furthermore, building space systems such as telecommunication satellites and their launch systems is costly; it is necessary to achieve high mission reliability. The variety of professional disciplines linked to these activities requires international
23、 standards to protect Earth populations against the consequences of a possible mishap caused by the failure of a highly pressurized hardware item. There is significant history to the analysis and design of pressure vessels and pressurized structures for use in space systems. This International Stand
24、ard establishes the preferred methods for these techniques in both the traditional metallic tanks, and the newer composite overwrapped pressure vessels. The emphasis is equally on adequate design and safe, as well as reliable, operation. BSISO14623:2003INTENRATIONAL TSANDADR IS:32641 O3002(E)I SO 30
25、02 All irhgts seredevr 1Space systems Pressure vessels and pressurized structures Design and operation 1 Scope This International Standard, based on general space experience and practice, specifies general and detailed requirements for metallic pressure vessels, composite overwrapped pressure vessel
26、s with metallic liners and metallic pressurized structures used in space systems. It is not applicable to pressure components (lines, fittings, valves, hoses, etc.) or to special pressurized hardware (batteries, heat pipes, cryostats and sealed containers). 2 Terms and definitions For the purposes o
27、f this document, the following terms and definitions apply. 2.1 A-basis allowable mechanical strength value above which at least 99 % of the population of values is expected to fall, with a confidence level of 95 % cf. “B” basis allowable (2.6) 2.2 acceptance tests required formal tests conducted on
28、 flight hardware to ascertain that the materials, manufacturing processes and workmanship meet specifications and that the hardware is acceptable for intended usage 2.3 allowable load (stress) maximum load (stress) that can be accommodated by a material/structure without potential rupture, collapse
29、or detrimental deformation in a given environment NOTE Allowable loads (stresses) commonly correspond to the statistically based minimum ultimate strength, buckling strength, and yield strength, respectively. 2.4 applied load stress actual load stress imposed on the structure in the service environm
30、ent 2.5 autofrettage vessel-sizing operation where pressure-driven deflection is used to plastically yield the metal liner into the overlying composite in order to induce initial compressive stress states in the metal liner 2.6 B-basis allowable mechanical strength value above which at least 90 % of
31、 the population of values is expected to fall, with a confidence level of 95 % cf. “A” basis allowable (2.1) BSISO14623:20031IS:32641 O3002(E) 2 I SO 3002 All irhgts seredevr2.7 brittle fracture catastrophic failure mode in a material/structure that usually occurs without prior plastic deformation a
32、nd at extremely high speed NOTE The fracture is usually characterized by a flat fracture surface with little or no shear lips (slant fracture surface) and at average stress levels below those of general yielding. 2.8 burst factor multiplying factor applied to the maximum expected operating pressure
33、(MEOP), or maximum design pressure (MDP), to obtain the design burst pressure NOTE 1 Burst factor is synonymous with design factor of safety for burst. NOTE 2 design burst pressure (2.16) sometimes referred to as burst pressure, is synonymous with “ultimate pressure”. 2.9 burst strength after impact
34、 BAI actual burst pressure of a composite overwrapped pressure vessel after it has been subjected to an impact event 2.10 component functional unit that is viewed as an entity for purpose of analysis, manufacturing, maintenance, or record keeping 2.11 composite overwrapped pressure vessel pressure v
35、essel with a fibre-based composite system fully or partially encapsulating a liner NOTE The liner serves as a fluid permeation barrier and may or may not carry substantial pressure loads. The composite overwraps generally carry pressure and environmental loads. 2.12 critical condition most severe en
36、vironmental condition in terms of loads, pressures and temperatures or combination thereof imposed on systems, subsystems, structures and components during service life 2.13 critical flaw specific shape of flaw with sufficient size such that unstable growth will occur under the specific operating lo
37、ad and environment 2.14 critical stress intensity factor stress intensity factor at which unstable fracture occurs 2.15 damage tolerance ability of a material/structure to resist failure due to the presence of flaws, cracks, delaminations, impact damage or other mechanical damage for a specified per
38、iod of unrepaired usage BSISO14623:20032IS:32641 O3002(E) I SO 3002 All irhgts seredevr 32.16 design burst pressure burst pressure “ultimate pressure” differential pressure that pressurized hardware must withstand without burst in the applicable operational environment NOTE Design burst pressure is
39、equal to the product of the MEOP or MDP and a design burst factor. 2.17 design safety factor design factor of safety factor or safety multiplying factor to be applied to the limit load and/or MEOP(or MDP) 2.18 destabilizing pressure differential pressure that produces compressive stresses in pressur
40、e hardware 2.19 detrimental deformation structural deformation, deflection, or displacement that prevents any portion of the structure or other system from performing its intended function 2.20 development test test to provide design information that may be used to check the validity of analytic tec
41、hnique and assumed design parameters, to uncover unexpected system response characteristics, to evaluate design changes, to determine interface compatibility, to prove qualification and acceptance procedures and techniques, to check manufacturing technology, or to establish accept/reject criteria 2.
42、21 ductile fracture type of failure mode in a material/structure generally preceded by a large amount of plastic deformation 2.22 elastically responding metallic liner metallic liner of a composite overwrapped pressure vessel that responds elastically (experiences no plastic response) at all pressur
43、e up to and including the vessels acceptance proof pressure after the autofrettage operation 2.23 fatigue process of progressive localized permanent structural change occurring in a material/structure subjected to conditions which produce fluctuating stresses and strains at some point or points and
44、which may culminate in cracks or complete fracture after a sufficient number of fluctuations 2.24 fatigue life number of cycles of stress or strain of a specified character that a given material or structure can sustain before failure of a specified nature could occur 2.25 flaw local discontinuity i
45、n a structural material such as a scratch, notch or crack 2.26 flaw shape shape of a surface crack or corner crack BSISO14623:20033IS:32641 O3002(E) 4 I SO 3002 All irhgts seredevrNOTE For a surface crack, the flaw shape is expressed as a/2c, where a is the crack depth and 2c is the crack length. Fo
46、r a corner crack, the flaw shape is expressed as a/c, where a is the crack depth and c is the crack length 2.27 fracture control application of design philosophy, analysis method, manufacturing technology, verification methodology, quality assurance, and operating procedures to prevent premature str
47、uctural failure caused by the propagation of cracks or crack-like flaws during fabrication, testing, transportation, handling and service 2.28 fracture mechanics engineering discipline that describes the behaviour of cracks or crack-like flaws in materials or structures under stress 2.29 fracture to
48、ughness generic term for measures of resistance to the extension of a crack 2.30 hazard existing or potential condition that can result in an accident 2.31 hydrogen embrittlement mechanical-environmental process that results from the initial presence or absorption of excessive amounts of hydrogen in
49、 metals, usually in combination with residual or applied tensile stresses 2.32 impact damage induced fault in the composite overwrap or the metallic liner of a composite overwrapped pressure vessel that is caused by an object strike on the vessel or vessel strike on an object 2.33 impact damage protector physical device that can be used to prevent impact damage 2.34 initial flaw flaw in a structural material before the application of load and/or d
