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 2017 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: +1 724-776-4970
4、 (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:/standards.sae.org/J2597_201709 SURFACE VEHICLERECOMMENDED PRACTICEJ2597 SEP2017 Issued 2010-01 Reaffirmed 2017-09 S
5、uperseding J2597 JAN2010 Computer Generated Shot Peening Saturation Curves RATIONALE J2597 has been reaffirmed to comply with the SAE Five-Year Review policy. TABLE OF CONTENTS 1. SCOPE 2 1.1 Purpose . 2 2. REFERENCES 2 2.1 Applicable Publications . 2 2.1.1 SAE Publications . 2 3. PROCEDURE . 2 3.1
6、Caution 2 3.2 Documentation 3 4. ALGORITHMS 4 5. NOTES 5 5.1 Marginal Indicia . 5 FIGURE 1 GRAPH OF EXAMPLE 1, SHOWING DERIVED INTENSITY IS 6.39 . 3 FIGURE 2 GRAPH SHOWING THE USE OF INVERSE FEED RATE 4 TABLE 1 SATURATION CURVE DATA SETS 3 1. SCOPE This SAE Recommended Practice defines a procedure f
7、or the use of computer generated saturation curves to determine peening intensity. Calculation of intensity within a tolerance band for each data set in Table 1 one is required for compliance with this practice. 1.1 Purpose Manually constructed saturation curves are difficult to generate and are sub
8、jective. The use of computer algorithms will provide a consistent treatment of data and also allow a convenient method to archive the data. This Practice includes examples of computer algorithms. It is the users responsibility to develop a suitable computer algorithm which generates data within the
9、tolerance bands of Table 1. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest version of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International,
10、400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J442 Test Strip, Holder, and Gage for Shot Peening SAE J443 Procedures for Using Standard Shot Peening Test Strip 3. PROCEDURE Ten data sets are shown in Table
11、 1. Each data set contains values for exposure times and test strip arc heights and a corresponding intensity answer. The candidate computer program must generate a saturation curve and numerical declaration of intensity which is within the tolerance band for each data set. The algorithm must produc
12、e results compliant with SAE J443. 3.1 Caution Users are cautioned to examine and evaluate the validity of any graph generated or intensity value declared. There may be instances of curve construction from erroneous data that results in invalid intensity values. It is the users responsibility to val
13、idate the data and the results obtained independently of the saturation curve program. _ SAE INTERNATIONAL J2597 SEP2017 Page 2 of 53.2 Documentation The program must include means to identify revision levels and dates of modifications. TABLE 1 - SATURATION CURVE DATA SETS 1 2 3 4 5 time arc height
14、time arc height time arc height time arc height time arc height 4 0.0060 2.5 0.0030 3 0.0065 1 0.0038 4 0.00626 0.0069 5 0.0036 6 0.0081 2 0.0051 6 0.00708 0.0070 10 0.0044 12 0.0088 3 0.0052 8 0.007212 0.0070 20 0.0044 24 0.0090 4 0.0053 12 0.00720.0064 0.0040 0.0080 0.0048 0.00666 7 8 9 10 time ar
15、c height time arc height K/Feed arc height K/Feed arc height K/Feed arc height 1.1 0.0046 2 0.0055 0.25 0.0081 0.25 0.0108 0.25 0.00452.3 0.0087 3 0.0066 0.50 0.0096 0.50 0.0129 0.50 0.00544.5 0.0101 4 0.0067 0.75 0.0100 0.75 0.0137 0.75 0.00599 0.0107 6 0.0068 1 0.0103 1 0.0144 1 0.00580.0098 0.006
16、3 2 0.0108 2 0.0157 2 0.00624 0.0113 4 0.0164 4 0.00640.0093 0.0137 0.0054NOTE: Target answers are shown in bold print. Candidate programs must reach all ten target answers to within 0.001. For example, an acceptable derived intensity for data set 1 would be within the range 0.0054 to 0.0074. The ar
17、c height values in Table 1 are in inches - for illustration purposes only. Some curve solver programs will not function properly with such small values. It is therefore acceptable for the data in Table 1 to be converted into thousandths of an inch for computational purposes. For example: use 12 inst
18、ead of 0.012. FIGURE 1 - GRAPH OF EXAMPLE 1, SHOWING DERIVED INTENSITY IS 6.39 (Graph courtesy of Dr. David Kirk) _ SAE INTERNATIONAL J2597 SEP2017 Page 3 of 5FIGURE 2 - GRAPH SHOWING THE USE OF INVERSE FEED RATE (Courtesy of Progressive Technologies) 4. ALGORITHMS The following examples are for ill
19、ustration only and are not meant to be exclusive. Other algorithms may be used which meet the requirements of data in Table 1 and the note therein. Example algorithm 1: This program fits data points to a two-parameter exponential equation: h = a(1- exp(-b*t) (Eq. 1) where h is Almen arc height, t is
20、 corresponding peening time and a and b are the two parameters. The program is recommended for use whenever the data set contains only four points. Example algorithm 2: This program fits data points to a two-parameter saturation growth equation: h = a*t/(b +t) (Eq. 2) where again h is Almen arc heig
21、ht, t is corresponding peening time and a and b are the two parameters. This algorithm is recommended for use whenever there is a requirement to conform to French specification NFL 06-832. _ SAE INTERNATIONAL J2597 SEP2017 Page 4 of 5Example algorithm 3: This program fits data points to a three-para
22、meter exponential equation: h = a(1- exp(-b*tc) (Eq. 3) where h is Almen arc height, t is corresponding peening time and a, b and c are the three parameters. This program is recommended for use whenever the data set contains more than four points. 5. NOTES 5.1 Marginal Indicia A change bar ( I ) loc
23、ated in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE SURFACE ENHANCEMENT COMMITTEE _ SAE INTERNATIONAL J2597 SEP2017 Page 5 of 5
