1、ARP5448/4Issued 2002-06Plain Bearing Bond Integrity - Peelable Woven Fabric PTFE Liners1. SCOPE:1.1 Purpose:This test method outlines a recommended procedure for performing bond integrity tests of bonded peelable woven fabric reinforced polytetrafluoroethylene (PTFE) liners, hereafter referred to wi
2、thin this document as “PTFE liner“ or “liner“. The data from these tests shall be used to determine if the product meets the “bond integrity“ requirements of the applicable specifications.1.2 Classification:Bearings covered by this test method shall be plain spherical, track roller, journal or rod e
3、nd bearing with PTFE liners.2. DEFINITIONS:2.1 BOND INTEGRITY:Bond integrity shall be defined as those characteristics of a PTFE liner bonded or attached to a substrate which affect bond quality and can be measured or determined by specific defined procedure.2.2 VOID:A void shall be defined as an ar
4、ea where the metal substrate is directly visible after peeling of the liner with no visible adhesive.2.3 UNBONDED AREA:An unbonded area shall be defined as an area where the adhesive remaining on the metal substrate is smooth and shiny indicating a lack of bonding pressure.Reaffirmed 2010-06AEROSPAC
5、ERECOMMENDEDPRACTICESAE 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 infringe
6、ment arising therefrom, 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 2010 SAE International All rights reserved. No part of
7、this publication 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: 724-776-
8、4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/ARP5448/4SAE ARP5448/4- 2 -3. GENERAL REQUIREMENTS:3.1 Test Apparatus:3.1.1 Test
9、 Machine: The test machine or device used may be of individual design but shall be capable of peeling the liner from the substrate at a controlled rate and providing the results. The test machine shall be such that the liner can be gripped and peeled at 140 40 to the bonded surface. A device such as
10、 a calibrated spring scale is acceptable for this test method.3.2 Test Specimen:3.2.1 Description: The quantity and configuration of the test specimen shall be as specified by the applicable specification or purchase order.3.2.2 Disposition After Test: The test specimen shall be held for a minimum p
11、eriod of 6 months for examination by the customer, if requested.4. DETAILED REQUIREMENTS:4.1 Peel:The liner shall be initially peeled away from the metal substrate using a blade or scribe to initiate the peel. The liner edge peeled back shall be gripped such that the liner can then be peeled from th
12、e substrate (see Figures 1 and 2). The rate of peel shall be approximately 0.5 to 1.0 inch per minute. The peel strength value in pounds shall be recorded. Where possible, the peel shall be conducted on the entire width of the bonded liner. Where this is not practical, the liner shall be cut through
13、 to the metal substrate with a minimum width of 0.5 inch and peeled as previously described.4.2 Evaluation:After the liner has been completely peeled from the metal substrate, the adhesive bond appearance shall be evaluated for voids and unbonded areas as required by the applicable specification.5.
14、NOTES:5.1 Intended Use:This test method is intended to evaluate bond integrity of PTFE lined bearings.SAE ARP5448/4- 3 -FIGURE 1 - Example of Peel Test FixtureSAE ARP5448/4- 4 -FIGURE 2 - Illustration of Peel Test Angle5.2 Method of Reference:This test method shall be referenced in general and detai
15、led specifications, standards or drawings for plain bearings. The following note shall be used to reference this test method:NOTE: The bearings shall be tested in accordance with ARP5448/4.The slash number refers to this specific test method.5.3 Test Data:5.3.1 Test Parameters: Specific test require
16、ments are given in the applicable specification. Test requirements shall include the following test parameters as applicable:a. Test specimen design envelopeb. Liner widthc. Peel strength in pounds and pounds per inchd. Adhesive bond appearance description (voids, unbonded areas along with size and
17、location)e. Quantity of parts represented by test specimenf. Failure criteria (breakage, etc.)SAE ARP5448/4- 5 -5.3.2 Test Reports: If required by the procuring activity in a separate document, the recorded data shall be summarized in report form and shall contain the following:a. Bearing descriptio
18、n1. Part number2. Lot identification3. Manufacturer4. A dated drawing completely describing the test bearing, including the dimensions, material and the peel strength/bond integrity ratingb. Test machine description1. Model number, serial number and a brief description2. Calibration datac. Data shee
19、tsd. Results of all inspections. This includes approval or rejection based primarily on peel strength and adhesive bond appearance.e. To ensure accuracy of test data, the bearing suppliers (or testing laboratory) shall certify that the data presented is the performance data for all bearings tested in the report and no data has been deleted.5.4 Keyword Listing:Bearing tests, bond integrityPREPARED UNDER THE JURISDICTION OFSAE SUBCOMMMITTEE ACBG-1, PLAIN BEARING OFCOMMITTEE ACBG, AIRFRAME CONTROL BEARINGS GROUP
