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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2009 SAE International All rights reserved. No part of this publication m
3、ay 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: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SURFACEVEHICLE STANDARD J855 NOV2009 Issued 1963-06 Revised 2009-11Superseding J855 SEP2002 Test Method of Stretch and Set of Textiles and Plastics RATIONALE Change temperature Section 4 and remove sample location re
5、strictions in Section 4. Add bold font to Section 4, Section 5 add L1. 1. SCOPE This method of test applies to the measurement of elastic and recovery properties of materials after being subjected to a low-static load. 2. REFERENCES There are no referenced publications specified herein. 3. APPARATUS
6、 REQUIRED 3.1 Fixtures The vice grip clamps are preferred because of the speed and ease of operation. Refer to Figure 1. 3.2 Weight A weight is attached to the clamp on the suspended end of the test specimen. The clamp and the weight together shall total 12.25 kg (27 lb) unless otherwise specified.
7、4. TEST SPECIMENS At 23 C 2 C (70 F 3 F) and 50% 5% relative humidity, cut three test specimens 76 mm x 229 mm (3 in x 9 in) (or as specified) each the machine direction, (MD), across machine direction (AMD) and bias direction (45 degree angle, both directions were applicable). The MD stretch and se
8、t are measured on the specimens with the long dimension parallel to the MD, and the AMD stretch and set are measured on the specimens with the long dimension parallel to the AMD. For woven fabrics such as bodycloth, sidewall, or headlining, the specimens should be cut slightly oversized and the yarn
9、s unraveled on each side until the 76 mm (3 in) dimension is attained. SAE J855 Revised NOV2009 Page 2 of 3 FIGURE 1 - CLAMP AND FIXTURE ASSEMBLY FOR STRETCH AND SET OF TEXTILES SAE J855 Revised NOV2009 Page 3 of 3 5. PROCEDURE Mark two parallel lines (L1) 76 mm (3 in) apart (or as specified) center
10、ed in the lengthwise direction of each specimen. Place benchmark lines in the center of each parallel line. Fasten the clamps firmly at each end of the test specimen. One clamp is attached to the supporting fixture and the weight is attached to the clamp on the other end. The weight is lowered caref
11、ully to prevent undue stress on the specimen, and the assembly is suspended vertically for 5 min. With the weight still applied measure the length of the section between the two parallel lines at the benchmarks. The reading should be to the closest 0.40 mm (1/64 in) and record the results as L2. Rem
12、ove the clamps and weight, and allow the specimen to recover in a horizontal position for 5 min. Again measure the length of the section between benchmarks and record as L3.16. CALCULATIONS AND REPORT Report the data as percent stretch and percent set calculated as follows in Equation 1: % StretchL2
13、L1L1- 100% SetL3L1L1-= 100=(Eq. 1) where measured lengths are taken between parallel lines at benchmarks: L1= Original length between parallel lines at bench marks L2= Measured length after the weight is applied for 5 min L3= Measured length after the 5 min recovery period Report the average of the
14、results for the three MD direction specimens as percentage MD stretch and set. Report the average of the results for the AMD three direction specimens as percentage AMD stretch and set. Report the average of the results for all the bias direction specimens as percentage bias stretch and set. 7. NOTE
15、S 7.1 Marginal Indicia A change bar (I) located 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 revisi
16、on 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 TEXTILES AND FLEXIBLE PLASTICS COMMITTEE 1Note in Figure 1. Peterson No. 8 clamp or equivalent clamp as agreed upon between contractual partys.
