1、BRITISH STANDARD BS ISO 9679:2006 Aerospace Clamps for fluid systems Test methods ICS 49.080 BS ISO 9679:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006 ISBN 0 580 49323 7 National foreword This British Standard
2、was published by BSI. It is the UK implementation of ISO 9679:2006. The UK participation in its preparation was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and components. A list of organizations represented on ACE/69 can be obtained on request to its secretary. This
3、 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 cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD I
4、SO 9679 First edition 2006-08-15 Reference number ISO 9679:2006(E) Aerospace Clamps for fluid systems Test methods Aronautique et espace Colliers pour systmes de fluides Mthodes dessaiBS ISO 9679:2006ii iii Foreword ISO (the International Organization for Standardization) is a worldwide federation o
5、f 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 subject for which a technical committee has been established has the right to be represented on that committee. In
6、ternational organizations, 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. International Standards are drafted in accordance with
7、the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare 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
8、 by at least 75 % of the member bodies casting a vote. 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. ISO 9679 was prepared by Technical Committee I
9、SO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components. BS ISO 9679:2006blank1 Aerospace Clamps for fluid systems Test methods 1S c o p e This International Standard specifies the test methods and procedures to be used for the qualification and comparison o
10、f support or retention devices used in the installation of aerospace fluid systems. It is applicable when reference is made to parts standards, procurement specifications, or other definition documents. 2 Normative references The following referenced documents are indispensable for the application o
11、f this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1431-1:2004, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static and dynamic strain testing
12、 ISO 2951, Vulcanized rubber Determination of insulation resistance ISO 4892-3, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps 3 General requirements 3.1 The tests required by this specification relate only to the qualification of the device. They do not infer
13、qualification of the service, installation or techniques used. All devices tested shall be in conformance with the applicable parts standard or development criteria. 3.2 Unless otherwise specified, all tests should be conducted at room temperature . 4 Material tests 4.1 General All materials used sh
14、all be in conformance with the specifications specified in the applicable parts standard. In addition, the following tests may be required by the parts standard, procurement specification or contract. 4.2 Ozone resistance All non-metallic materials, vulcanized or thermoplastic, shall be free of crac
15、king when tested in accordance with ISO 1431-1:2004, procurement B, at a volume fraction of ozone of , under an strain for , and at a temperature of . (25 10) C 6 10 6 80 % 6h (40 2) C BS ISO 9679:20062 4.3 Flame resistance 4.3.1 General All non-metallic materials shall be tested for flammability by
16、 means of a vertical burn test, as specified in this subclause. The flame source shall be a Bunsen Burner or a similar burner, having a normal diameter of ( ). The burner shall be adjusted to provide a ( ) high flame of blue intensity. Verify flame temperature to be minimum of at the centre of the f
17、lame, by use of thermocouple. 4.3.2 Test specimens Specimens shall be actual components mounted in an “as used” condition as close as possible to their use in an aircraft. All test specimens shall include the necessary mounting hardware and tubing. See Figure 1 for examples. 4.3.3 Preconditioning Al
18、l specimens shall be preconditioned at to at relative humidity for a period of prior to testing. 4.3.4 Test Remove specimens, one at a time, from the preconditioning chamber immediately before performing the test. Position the specimens above the burner so the flame strikes the specimen at approxima
19、tely . Apply the flame for and remove. The average burn time of three specimens after removal of the flame shall not exceed . Dripping from the burning specimens shall not burn for more than after dropping. 4.4 Insulation properties If necessary for a particular installation, the insulation value of
20、 vulcanized rubber shall be determined by referring to ISO 2951. 4.5 Ultraviolet resistance Various plastic and organic elastomer materials exposed to sunlight and some electrical applications can be susceptible to ultraviolet attack. When these types of material are used on exterior applications, t
21、hey should be tested in accordance with ISO 4892-3. 4.6 Titanium compatibility 4.6.1 Principle Where clamping devices are employed to support titanium tube installations, the sheathing or other materials in direct contact with the tubing shall be tested to determine if they have any chemical effect
22、on the tubing. 4.6.2 Test methods Mount five size-25 ( ) clamps on a length of titanium alloy tubing, material type Ti-3Al2,5V, with no spacers between the test samples. The tubing, with the clamps mounted, shall be filled with hydraulic fluid and exposed to the clamping devices maximum rated servic
23、e temperature for . Pressure in the tube shall be maintained at ( ) during the exposure. The test apparatus shall be removed and placed in an atmosphere of and relative humidity for . There shall be no evidence of cracking or pitting of the titanium tube specimen when observed with a five to ten pow
24、er magnifying glass. 10 mm 0,40 in 38 mm 1,52 in 849 C 20 C 25 C (50 5) % 24 h 19 mm 90 12 s 15 s 5s 1in 12 d 21 000 kPa 3 000 psi 12 d 70 C 95 % 20 d BS ISO 9679:20063 Dimensions in millimetres (Dimensions in inches) a) Clamp block b) Clamp, loop style Figure 1 Flame resistance test set-up BS ISO 9
25、679:20064 5 Tube support assembly tests 5.1 Preparation for tests 5.1.1 Principle This series of tests is intended to control the durability of the support device and provide a method of comparing the vibration dampening and wear characteristics of tubing supports. 5.1.2 Test assemblies All test spe
26、cimens and assemblies, clamps, blocks, and grommets used shall be for the tube sizes ( ), ( ) and ( ). Tubing shall be titanium alloy Ti-3Al2,5V or equivalent. 5.1.3 Preconditioning All test specimens shall be preconditioned at to and relative humidity for a period ofprior to testing. 5.1.4 Test seq
27、uence Testing shall be conducted in the following sequence using the same specimens throughout: retention test; vibration and transmissibility test; test specimen inspection. c) Bulkhead grommet d) Clamp saddle Figure 1 Flame resistance test set-up (Continued) 12 mm 0,5 in 19 mm 0,75 in 25 mm 1in 20
28、 C 50 C (50 5) % 24 h BS ISO 9679:20065 If a failure occurs, the entire sequence shall be repeated using new specimens and tubes. 5.2 Retention test 5.2.1 Principle This test is intended to verify the retention value of the tube support device before and after the assembly is subject to vibration an
29、d thereby determine any resulting degradation. 5.2.2 Procedure Each assembly specimen shall be mounted on a clean dry tube as shown in Figure 2 using a stainless-steel bolt MJ5 ( thread), free-running nut and a ( ) spacer, applicable for the device. The tube shall be slowly forced longitudinally thr
30、ough the device to a distance of ( ) and the force recorded. Specimens shall not exhibit any separation or delamination. Forces shall exceed those listed in the applicable procurement specification. Key 1 mandrel 2 base with hole equal to mandrel diameter plus ( ) 3 shim or spacer between clamp feet
31、 a Axial mandrel or tube force. Figure 2 Retention test 0,1 900 in 1,6 mm 0,064 in 25 mm 1in 1mm 0,040 in BS ISO 9679:20066 5.3 Vibration and transmissibility test 5.3.1 Principle This test is intended to establish the integrity of the device under vibration and reveal its transmission of vibration
32、between the structure and tubing. After testing various devices, a comparison of performance can be established. 5.3.2 Procedure Tube sizes ( ), ( ) and ( ) shall be used. Three specimens of each size shall be tested, using tubing filled with hydraulic fluid. The overall length of the tubes shall be
33、 ( ), spacing between supports ( ), with ( ) overhang each end. The tube assembly shall be installed on a vibration fixture and vibration table as shown in Figure 3. Specimens shall be mounted on the vibration fixture using bolts MJ5 ( thread) with or higher strength. A flat washer shall be used ben
34、eath the head of the mounting bolt with the smooth edge against the clamp foot. An input measuring accelerometer shall be mounted on the vibration fixture, adjacent to but not touching the centre clamp specimen. A second output accelerometer shall be mounted on the tube adjacent to, but not touching
35、, the centre clamp (see Figure 3). The test specimen shall be subjected to a simple harmonic motion having a vibration acceleration of through a frequency range of to . The sweep rate shall be logarithmic, requiring per cycle. One frequency cycle shall consist of to to . A resonance search shall be
36、made and each resonance peak recorded (frequency and acceleration peak). 5.3.3 Transmissibility The transmissibility ratio shall be calculated for each resonance peak and recorded. The test specimens shall then be subjected to a dwell at the most severe resonance peak for at a constant sinusoidal vi
37、bratory acceleration of . The vibration test shall be repeated with three new test specimens of the same size as specified. 5.4 Test specimen inspection 5.4.1 All specimens tested shall be subjected to the retention test specified in 5.2. All results shall meet the maximum axial force requirements s
38、pecified in 5.2.2. 5.4.2 All test specimens shall be thoroughly examined for integrity and degradation, such as cracks, separation of components, excessive wear and degradation of materials which would impair their intended use. 5.4.3 All tubing used in the vibration and transmissibility testing sha
39、ll be examined under a five to ten power magnifying glass for evidence of cracking, abrasion or other deterioration which would impair its intended use. Any tube wear should not exceed of the tubing wall thickness. 12 mm 0,5 in 19 mm 0,75 in 25 mm 1in 737 mm 29 in 305 mm 12 in 64 mm 2,5 in 0,190 0 i
40、n 1 000 MPa 2g 50 Hz 500 Hz 5 min 50 Hz 500 Hz 50 Hz TR=( g output) / (g input) 30 min 10g 5% BS ISO 9679:20067 Dimensions in millimetres (Dimensions in inches) a) Clamp, loop style b) Clamp saddle c) Clamp block Key 1 output accelerometer 2 input accelerometer a Axis of vibration. Figure 3 Vibratio
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