1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 10830:2011Space systems Non-destructive testing Automatic ultrasonic inspectionmethod of graphite ingot forsolid rocket motorsBS ISO 10830:2011 BRITISH STANDARDNational fo
2、rewordThis British Standard is the UK implementation of ISO 10830:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/68/-/8, Space systems and operations - Materials andprocesses.A list of organizations represented on this committee can beobtained on request to its
3、secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66378 9ICS 19.100; 49.140Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard wa
4、s published under the authority of theStandards Policy and Strategy Committee on 31 August 2011.Amendments issued since publicationDate Text affectedBS ISO 10830:2011Reference numberISO 10830:2011(E)ISO 2011INTERNATIONAL STANDARD ISO10830First edition2011-07-15Space systems Non-destructive testing A
5、utomatic ultrasonic inspection method of graphite ingot for solid rocket motors Systmes spatiaux Essais non destructifs Mthode par injection ultrasonique du bloc graphite pour les moteurs de fuse combustible solide BS ISO 10830:2011ISO 10830:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights r
6、eserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 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 req
7、uester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedBS ISO 10830:2011ISO 10830:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Int
8、roduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 4 General . 4 4.1 Requirements . 4 4.2 Test conductor . 5 5 Composition of ultrasonic test equipment . 5 5.1 Basic composition of equipment . 5 5.2 Ultrasonic test instrument 5 5.3 Probe . 6 5.4 Scanning equipment . 6 5.5 D
9、isplay and recording equipment . 6 6 Preparation of automatic ultrasonic inspection . 7 6.1 Reference blocks . 7 6.2 Water path 8 6.3 Setting for angle-beam incidence 8 6.4 Scanning zone and gate range 8 6.5 Distance-amplitude correction . 9 6.6 Determination of apparent widths of beam spread . 9 6.
10、7 Selection of scanning pitch in beam-index scanning . 10 6.8 Selection of data collection interval in incident-angle scanning . 10 6.9 Required compensation of detection sensitivity . 10 7 Procedure for automatic ultrasonic inspection . 11 7.1 Test blocks . 11 7.2 Test sequence 12 8 Automatic ultra
11、sonic inspection 13 8.1 Preparation for testing 13 8.2 Primary inspection 13 8.3 Secondary inspection . 14 9 Acceptance criteria . 14 10 Reporting and recording. 14 10.1 General . 14 10.2 Report of test result 14 10.3 Scanning details and corresponding gate range . 14 10.4 Inspection condition data
12、. 15 10.5 Secondary inspection details . 15 Annex A (normative) Reference blocks and test method for ultrasonic characteristic determination of graphite ingot . 16 Annex B (normative) Propagation-characteristic test of graphite ingot . 22 Bibliography 25 BS ISO 10830:2011ISO 10830:2011(E) iv ISO 201
13、1 All rights reservedForeword 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
14、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 the work. ISO collaborates closely with the International Electrotechnical Commission
15、 (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 prepare International Standards. Draft International Standards adopted by the technical com
16、mittees 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 some of the elements of this document may be the subject of patent rights. ISO shall not
17、 be held responsible for identifying any or all such patent rights. ISO 10830 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. BS ISO 10830:2011ISO 10830:2011(E) ISO 2011 All rights reserved vIntroduction In February 2000,
18、the Institute of Space and Astronautical Science (now Japan Aerospace Exploration Agency) launched an M-V-4 rocket that experienced an unexpected failure. An intensive post-flight study was carried out. It was finally concluded that the failure originated from the fracture of a nozzle throat insert
19、made of graphite1. Then, a study of non-destructive inspection was initiated, and the ultrasonic inspection method specified in this International Standard was developed for use on the throat inserts of solid rocket motors. Graphite materials have been utilized without quantitative non-destructive i
20、nspection in many applications, except for one example of the core structure of the High Temperature Engineering Test Reactor (HTTR) of the Japan Atomic Energy Research Institute2. There, planar flaws perpendicular to the top, bottom or side surfaces in a cylindrical ingot were targeted. However, fo
21、r aerospace applications, it is necessary to detect internal planar flaws oriented in various directions. The method is based on a single-probe, pulse-echo and immersion technique utilizing normal and angle-beam techniques to detect internal planar flaws oriented in various directions. The wave velo
22、city and the attenuation coefficient in the test object are measured before inspection to determine the differences in acoustic properties from ingot to ingot. Incident-angle scanning is adopted in addition to the common beam-axis scanning to detect flaws that can be oriented in various directions.
23、This inspection technique is necessary for inspection of sintered materials in general, including ceramics, and not only for graphite used in solid rocket motors. The method was first published as JIS Z 23563in 2006 by the Japanese Industrial Standards Committee. BS ISO 10830:2011BS ISO 10830:2011IN
24、TERNATIONAL STANDARD ISO 10830:2011(E) ISO 2011 All rights reserved 1Space systems Non-destructive testing Automatic ultrasonic inspection method of graphite ingot for solid rocket motors 1 Scope This International Standard is applicable to the inspection of isotropic graphite ingots for use in soli
25、d rocket motors, in order to detect planar flaws oriented in various directions, using immersion testing by means of a single-probe, pulse-echo ultrasonic method. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, o
26、nly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5577, Non-destructive testing Ultrasonic inspection Vocabulary ISO 9712, Non-destructive testing Qualification and certification of NDT personnel General princ
27、iples 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5577 and the following apply. 3.1 beam-index scanning common scanning method in which a probe (beam index) traverses the test surface of the test block NOTE Either R-X scanning or R-Z scanning is
28、conducted, depending on the test surface. 3.2 R-X scanning beam-index scanning method that is executed on the top or bottom surface of the test block NOTE It consists of the traverse translation of the probe in the diametrical direction of the test block and the axial rotation of the test block (see
29、 Figure 1). 3.3 R-Z scanning beam-index scanning method that is executed on the side surface of the test block NOTE It consists of the traverse translation of the probe in the longitudinal direction of the test block and the axial rotation of the test block (see Figure 2). BS ISO 10830:2011ISO 10830
30、:2011(E) 2 ISO 2011 All rights reservedR i13l2 Z Y X 3 X i21 1 2 Key 1 test block i2swivel 2 probe l water path 3 water R rotation i1incident angle X transverse Figure 1 Schematic diagram of R-X scanning off3 i1lR3 ZZYX1 2 1 2 Key 1 test block l water path 2 probe offoffset 3 water R rotation i1inci
31、dent angle Z transverse Figure 2 Schematic diagram of R-Z scanning BS ISO 10830:2011ISO 10830:2011(E) ISO 2011 All rights reserved 33.4 incident-angle scanning scanning method in which the two independent incident angles of a probe are changed sequentially NOTE Either i1-i2scanning or i1-offscanning
32、 is conducted following either an orthogonal scanning or staggered scanning method. 3.5 i1-i2scanning incident-angle scanning method that is executed on the top or bottom surface of the test block NOTE It consists of changing the angle of incidence (inclining angle) i1and changing the swivel angle i
33、2(see Figure 1). R-X scanning is conducted at each setting angle (data collection point). 3.6 i1-offscanning incident-angle scanning method that is executed on the side surface of the test block NOTE It consists of changing the longitudinal incident angle i1and changing the offset distance off(corre
34、sponding to the horizontal incident angle, see Figure 2). R-Z scanning is conducted at each setting angle (data collection point). 3.7 orthogonal scanning scanning method used in incident-angle scanning in which setting angles (data collection points) form a square lattice 3.8 staggered scanning sca
35、nning method used in incident-angle scanning in which setting angles (data collection points) form a hexagonal lattice such that the number of scanning points is less than in the case of orthogonal scanning NOTE Here, the scanning points are placed in a zigzag position with respect to one another (s
36、ee Figure 3). 3.9 primary inspection first of two inspection stages in which scanning is conducted using a relatively large scanning pitch, which corresponds to relatively large apparent widths of beam spread, and at a relatively high level of sensitivity NOTE This stage identifies suspicious spots
37、to be inspected in the secondary inspection. 3.10 secondary inspection second of two inspection stages in which scanning is carried out on the spots identified in the primary inspection using a relatively small scanning pitch, which corresponds to relatively small apparent widths of beam spread, but
38、 at a relatively low level of sensitivity (lower by the beam-edge compensation than that of the primary inspection), in order to qualify the tested block 3.11 two-axis swivel scanning swivel scanning in two incident-angle axes to obtain the maximum echo height, compensating for the wave-front fluctu
39、ation induced by the uneven ultrasonic propagation characteristics of graphite NOTE Two-axis swivel scanning is conducted in the survey of echo height of a flat-bottomed hole to set the specified sensitivity. 3.12 planar width of beam spread transversal range of a beam in which the echo of a flat-bo
40、ttomed hole equivalent to the flaw to be detected appears at a height above the specified echo level in beam-index scanning BS ISO 10830:2011ISO 10830:2011(E) 4 ISO 2011 All rights reserved3 21 3 2 2235 4 Key 1 ultrasonic beam 2 angle of refraction corresponding to i13 angle of refraction correspond
41、ing to i2or off4 beam index 5 effective beam area of an incidence point Figure 3 Schematic diagram of staggered scanning in incident-angle scanning 3.13 angular width of beam spread angular range of a beam in which the echo of a flat-bottomed hole equivalent to the flaw to be detected appears at a h
42、eight above the specified echo level in incident-angle scanning 3.14 apparent attenuation-compensation rate compensation for residual difference in echo height between the reference block and the test block NOTE The apparent attenuation-compensation rate is applied after compensation of wave-front f
43、luctuation by two-axis swivel scanning in the calibration of detection sensitivity. The difference is understood as the difference in properties between graphite ingot lots. 4 General 4.1 Requirements Test blocks are cylindrical in form with a diameter/height ratio of approximately one and a diamete
44、r and a height no greater than 225 mm. Prior to inspection, the size, position and direction of the permissible flaw shall be evaluated in the design procedure. The minimum equivalent flaw diameter to be detected shall be greater than 3 mm. NOTE 1 Isotropic graphite to be inspected by this method is
45、 produced by isostatic pressing. NOTE 2 A larger test block might be inspected in accordance with this International Standard; however, the procedure has not been validated at diameters and heights greater than 225 mm. BS ISO 10830:2011ISO 10830:2011(E) ISO 2011 All rights reserved 54.2 Test conduct
46、or Persons who conduct this ultrasonic inspection of a graphite ingot for solid rocket motors shall be qualified to ultrasonic testing (UT) Level 2 in accordance with ISO 9712, or its equivalent, they shall have sufficient knowledge of graphite material and inspection methods, and they shall be trai
47、ned in the operation of ultrasonic inspection equipment. 5 Composition of ultrasonic test equipment 5.1 Basic composition of equipment Equipment adopted for this method comprises an ultrasonic test instrument, a probe and its associated scanning equipment, and displaying and recording equipment. Fig
48、ure 4 shows the composition of the equipment. 58673 41 2 Key 1 test block 5 scanner 2 probe 6 controller 3 water 7 ultrasonic pulser/receiver 4 water tank 8 six axes (X, Y, Z, i1, i2, R) Figure 4 Composition of automatic ultrasonic test equipment 5.2 Ultrasonic test instrument In addition to its bas
49、ic function as an ultrasonic pulser/receiver that transmits spike pulses, the ultrasonic test instrument has an echo-recording gate, a distance-amplitude correction function (DAC circuit) and a data output/memory function, as specified in a) to c) below: a) Echo-recording gate: At least one recording gate is provided. b) Distance-amplitude compensation (DAC): A DAC curve is drawn by plotting echo heights at six or more points in the beam path. The DAC circuit has a compensation capability of at least 30 dB.
