1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/MA2008 AEROSPACE STANDARD MA2008 Issued 1990-12 Reaffirmed 2015-08 Radii-Tube Ben
5、d, Metric RATIONALE MA2008 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:This standard defines criteria for acceptability of tube bends for hydraulic system metallic tubing.2. REFERENCES:MA2002 Impulse Testing of Hydraulic Hose, Tubing and Fitting AssembliesMA2006 Hydr
6、aulic Tubing, Qualification Test RequirementsAIR1379 Prestressing (Autofrettaging) of Hydraulic Tubing Lines3. REQUIREMENTS:a. Recommended Bend Radii:Recommended bend radii per Table 1 should be used where possible to minimize cost of tools, and because experience has shown these to be acceptable va
7、lues. For low and medium strength tubing, special radii per Table 1 are acceptable.b. Flatness Limitations:(1) Flatness in the area of a tube bend shall be defined by Equation 1:(Eq. 1)Terms are defined in Figure 1.FlatnessMax O.D. Min O.D.Nominal O.D.-100%=SAE INTERNATIONAL MA2008 Page 2 of 4 TABLE
8、 1 - Bend Radii for Low and Medium StrengthCorrosion Resistant Steel and Aluminum TubingFIGURE 1 - Tube BendSAE INTERNATIONAL MA2008 Page 3 of 4 3. (Continued):(2) Tube flatness for fluid systems with working pressures of 7000 kPa or greater shall not exceed 5% for corrosion resistant steel and alum
9、inum and 3% for pure titanium or titanium alloy with wall thicknesses listed in Table 2.TABLE 2 - Bend Radii and Wall Thicknesses forHigh Strength Tubing (21 000 kPa and 28 000 kPa Service)(3) Tube flatness for fluid systems with working pressures less than 7000 kPa shall not exceed 10% for corrosio
10、n resistant steel and aluminum and 5% for titanium.(4) Flatness limitations apply to bend radii listed in this standard. Applicability to other bend radii should be verified by testing.(5) The performance of hydraulic tubing can be improved by autofrettage treatment as described in AIR1379.c. Wrinkl
11、es and Scratches:Permissible wrinkles and scratches in a tube bend shall be as defined in Table 3. Terms are defined in Figure 2.SAE INTERNATIONAL MA2008 Page 4 of 4 TABLE 3 - Permissible Wrinkles and Scratches in BendsFIGURE 2 - Allowable Wrinkles4. NOTES:4.1 This standard is the metric equivalent
12、of MS33611. Pertinent revisions will be simultaneous to both standards. Flatness requirements in this document are based on testing according to MA2002 and MA2006.PREPARED BY SAE SUBCOMMITTEE G-3E, AEROSPACE TUBING INSTALLATION OFSAE COMMITTEE G-3AEROSPACE COUPLINGS, FITTINGS, HOSE AND TUBING ASSEMBLIES
