1、Designation: D 5649 01Standard Test Method forTorque Strength of Adhesives Used on Threaded Fasteners1This standard is issued under the fixed designation D 5649; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is used to make comparative assess-ments of the securing or locking effect of adhesives used inthreaded assem
3、blies.1.2 The values stated in inch-pound units are to be regardedas the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and d
4、etermine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 907 Terminology of AdhesivesD 2651 Guide for Preparation of Metal Surfaces for Adhe-sive BondingE 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 691 Practice for
5、Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsFor technical terms pertaining to adhe-sives, see Terminology D 907.3.2 Definitions of Terms Specific to This Standard:3.2.1 breakaway torquethe initial torque required to breakthe bond measure
6、d at the first movement between the nut andthe bolt when unscrewing an unseated assembly.3.2.2 on torquethe maximum torque required to screw thenut onto a preapplied adhesive-coated bolt.3.2.3 prevailing torquethe torque measured after the ini-tial breakage of the bond measured at 180 rotation of th
7、e nut.4. Summary of Test Method4.1 This test method consists of determining the torquerequired to unscrew a bonded nut and bolt assembly. Break-away torque and prevailing torque are determined.5. Significance and Use5.1 This test method provides reasonably accurate informa-tion with regard to the de
8、termination of the securing or lockingeffect of adhesives used in threaded fasteners. This test methodmay also be used to determine the degree of cure and the effectof environment on torque strength.5.2 The accuracy of the test results depends to a largedegree on the thread clearance of the test fas
9、teners and theinclusion of air bubbles in the bond line. Data generated by thistest method should be safety-factored accordingly if used asquality assurance acceptance or rejection.6. Apparatus6.1 Electronic RecordingTest machine consisting of aclamping device to secure the bolt head, and a device f
10、orturning the nut with simultaneous measurement and registra-tion of the torque as a function of the angle of turning by directanalog or digital means.6.2 Direct Reading A clamping device to secure the headof the bolt, and a torque wrench accurate to 65%.7. Test Specimens7.1 Any size and substrate f
11、asteners may be used uponagreement between the supplier and the user of adhesives.7.2 Unless otherwise agreed upon between the user and theadhesive manufacturer, degrease all non-plated nuts and bolts(refer to Guide D 2651), store in an atmosphere of lowhumidity, and keep them clean.7.3 Where desire
12、d, and if agreed upon between the user andthe adhesive manufacturer, non-plated nuts and bolts may beused as received, reoiled, or after other special treatments.7.4 Plated nuts and bolts do not normally require any specialcleaning prior to assembly.8. Assembly8.1 Assemble not less than five specime
13、ns for each test asfollows:8.1.1 Preassemble nuts and bolts prior to application ofadhesive. Discard any pairs showing sticking due to burrs ordamaged threads. Disassemble the parts.8.1.2 For liquid adhesives, apply sufficient adhesive to thebolt to completely cover an area equal to the height of th
14、e nutplus three threads. Also, apply adhesive to the threads of the1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.60 on AdhesiveMaterial Classification System.Current edition approved March 10, 2001. Published May 20
15、01. Originallypublished as D 5649 - 94. Last previous edition D 5649 - 94.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.nut. Follow the adhesives manufacturers instructions forapplication of preapplied adhesives.8.1.3 Screw the nut
16、 onto the bolt by hand, allowing threethreads to protrude. For preapplied adhesives, screw the nutonto the coated bolt using the apparatus in 6.1 or 6.2 and recordthe on torque. Allow three adhesive-coated threads to protrude.8.1.4 Cure the adhesive in accordance with the manufactur-ers instructions
17、 with the test specimen standing vertically onthe bolt head.8.1.4.1 When specified or recommended, for primed oractivated surfaces, use the manufacturers primer. Apply theprimer and adhesive in accordance with the manufacturersinstructions. Assemble and cure the specimens for a time andtemperature i
18、n accordance with the manufacturers recommen-dations.9. Procedure9.1 After allowing for cure and any planned environmentalconditioning, determine the torque strengths as follows:9.1.1 Secure the bolt head in the clamping device andunscrew the nut at a speed of 10 r/min.9.1.2 Record the breakaway tor
19、que and the prevailingtorque as measured on the electronic recording equipment, orfrom a direct reading if a torque wrench is used.NOTE 1If electronic recording equipment is used, breakaway torqueis measured at the initial point of deviation from linearity on the curvewhich corresponds to the first
20、movement of the nut.10. Report10.1 Report the following information:10.1.1 Complete identification of the adhesive used, includ-ing type, source, date manufactured, manufacturers codenumber, and form,10.1.2 Specimen size and substrate used,10.1.3 Method of cleaning and surface preparation prior tobo
21、nding,10.1.4 Application and bonding conditions used in prepar-ing the specimens,10.1.5 Conditioning procedure used for specimens prior totesting.10.1.6 Number of specimens tested,10.1.7 Testing speed,10.1.8 Test equipment, and10.1.9 Average value for torque strengths determined.11. Precision and Bi
22、as11.1 PrecisionAn interlaboratory study of the torquestrength of anaerobic adhesives was run in 1992. Each of eightlaboratories tested ten test specimens for breakaway torque andten test specimens for prevailing torque from each of eightadhesives ranging in viscosity from 10 to 10 000 cP. Adhesives
23、A, B, C, D, F, and H were tested using degreased,38-in. size,16 threads per inch, Unified National Coarse thread series (383 16 UNC), Grade 5 steel bolts with degreased, Grade 2 steelnuts. Adhesives E and G were tested using38-in. size, 24threads per inch, Unified National Fine thread series (38 3 2
24、4UNF), Grade 2 steel bolts with degreased, Grade 2 steel nuts.Relative humidity was controlled between 40 and 60 % at 70 to77F, and all samples were cured for 24 h. Practice E 691 wasfollowed for the design and analysis of the data. The repeat-ability and reproducibility limits in Table 1 were obtai
25、ned foreach of the eight materials as a result of the interlaboratorystudy.11.1.1 The terms repeatability and reproducibility limit areused as specified in Practice E 177. The respective standarddeviations among test results may be obtained by dividingColumns 3 and 4 in Table 1 by 2.8.11.2 BiasSince
26、 there is no accepted reference material,method, or laboratory suitable for determining the bias for theprocedure in this test method for measuring torque strength ofadhesives, no statement on bias exists.12. Keywords12.1 adhesive; breakaway torque; prevailing torque; thread-locking; torqueTABLE 1 l
27、nterlaboratory Study of the Torque Strength ofAnaerobic AdhesivesAdhesiveBreakawayTorque, lbf/in.95 %, limit, lbf/in.Repeatability ReproducibilityG39164D 78 79 201E 95 79 242A9287F 137 74 118H 192 64 180B 240 65 134C 294 89 170AdhesivePrevailingTorque, lbf/in.95 % limit, lbf/in.Repeatability Reprodu
28、cibilityG 331768A 432179F 87 55 120H 167 115 204B 262 109 246D 264 159 254C 276 132 293E 283 174 185D5649012ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised t
29、hat determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapp
30、roved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you
31、feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D5649013
