1、Designation: D5649 15Standard Test Method forTorque Strength of Adhesives Used on Threaded Fasteners1This standard is issued under the fixed designation D5649; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 assembli
3、es.1.2 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.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 est
4、ablish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesD2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingE177 Practice for Use of the Terms Precision
5、 and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 DefinitionsFor technical terms pertaining toadhesives, see Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 breakaway torque, nthe i
6、nitial torque required tobreak the bond measured at the first movement between the nutand the bolt when unscrewing an unseated assembly.3.2.2 on torque, nthe maximum torque required to screwthe nut onto a preapplied adhesive-coated bolt.3.2.3 prevailing torque, nthe torque measured after theinitial
7、breakage of the bond measured at 180 rotation of thenut.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 reas
8、onably accurate informa-tion with regard to the determination 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 l
9、argedegree on the thread clearance of the test fasteners 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 aclamp
10、ing device to secure the bolt head, and a device forturning 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 ReadingA clamping device to secure the headof the bolt, and a torque wrench accurate to
11、65%.7. Test Specimens7.1 Any size and substrate fasteners 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 D2651), store in an atmosphere of l
12、owhumidity, and keep them clean.7.3 Where desired, 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.1T
13、his 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 April 1, 2015. Published April 2015. Originallyapproved in 1994. Last previous edition approved in 20
14、08 as D5649 01 (2008).DOI: 10.1520/D5649-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM In
15、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Assembly8.1 Assemble not less than five specimens for each test asfollows:8.1.1 Preassemble nuts and bolts prior to application ofadhesive. Discard any pairs showing sticking due to burrs ordamaged th
16、reads. Disassemble the parts.8.1.2 For liquid adhesives, apply sufficient adhesive to thebolt to completely cover an area equal to the height of the nutplus three threads. Also, apply adhesive to the threads of thenut. Follow the adhesives manufacturers instructions forapplication of preapplied adhe
17、sives.8.1.3 Remove, flip and re-screw the nut onto the bolt byhand, allowing three threads to protrude. For preappliedadhesives, screw the nut onto the coated bolt using theapparatus in 6.1 or 6.2 and record the on torque. Allow threeadhesive-coated threads to protrude.8.1.4 Cure the adhesive in acc
18、ordance with the manufactur-ers instructions 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 cu
19、re the specimens for a time andtemperature in 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 spee
20、d of 10 r/min.9.1.2 Record the breakaway torque 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 torque ismeasured at the initial point of deviation from linearity
21、 on the curve whichcorresponds to the first 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
22、 cleaning and surface preparation prior tobonding,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 torq
23、ue strengths determined.11. Precision and Bias11.1 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
24、in viscosity from 10 to 10 000 cP.AdhesivesA, B, C, D, F, and H were tested using degreased,38-in. size,16 threads per inch, Unified National Coarse thread series (38 16 UNC), Grade 5 steel bolts with degreased, Grade 2 steelnuts. Adhesives E and G were tested using38-in. size, 24threads per inch, U
25、nified National Fine thread series (38 24UNF), 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 E691 wasfollowed for the design and analysis of the data. The repeat-ability and repro
26、ducibility limits in Table 1 were obtained 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 E177. The respective standardTABLE 1 lnterlaboratory Study of the Torque Strength ofAnaerobic Ad
27、hesivesAdhesiveBreakawayTorque, 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 ReproducibilityG 331768A 432179F 87 55 120H 167 115 204B 262 109
28、246D 264 159 254C 276 132 293E 283 174 185D5649 152deviations among test results may be obtained by dividingColumns 3 and 4 in Table 1 by 2.8.11.2 BiasSince there is no accepted reference material,method, or laboratory suitable for determining the bias for theprocedure in this test method for measur
29、ing torque strength ofadhesives, no statement on bias exists.12. Keywords12.1 adhesive; breakaway torque; prevailing torque; thread-locking; torqueASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users o
30、f this standard are expressly advised that 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 fiv
31、e years andif not revised, either reapproved 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 c
32、ommittee, which you may attend. If you 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
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