1、Designation: D 5649 01 (Reapproved 2008)Standard 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
2、 year of last revision. 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 use
3、d inthreaded assemblies.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
4、 this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 907 Terminology of AdhesivesD 2651 Guide for Preparation of Metal Surfaces for Adhe-sive BondingE 177 Practice for
5、 Use of the Terms Precision and Bias inASTM Test MethodsE 691 Practice for 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
6、:3.2.1 breakaway torque, nthe initial 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 to
7、rque measured after theinitial 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
8、 This test method provides reasonably 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
9、the test results depends to a largedegree 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 RecordingTe
10、st machine consisting of aclamping 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, a
11、nd a torque wrench accurate to 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 D 26
12、51), store in an atmosphere of lowhumidity, 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 spec
13、ialcleaning prior to assembly.1This 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, 2008. Published April 2008. Originallyapproved in 1994. Last
14、 previous edition approved in 2001 as D 5649 - 01.2For 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.1Copyright
15、ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. 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 ordam
16、aged 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 the nutplus three threads. Also, apply adhesive to the threads of thenut. Follow the adhesives manufacturers instructions forapplication of preappli
17、ed adhesives.8.1.3 Screw the nut 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
18、 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 cure the speci
19、mens 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 speed of 10 r/mi
20、n.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 torqueis measured at the initial point of deviation from linearity on the curv
21、ewhich corresponds 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 cleaning an
22、d 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 torque strengths
23、 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 in viscosity
24、 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 (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 Nat
25、ional Fine thread series (38 3 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 E 691 wasfollowed for the design and analysis of the data. The repeat-ability and reproducibil
26、ity limits in Table 1 were obtained foreach of the eight materials as a result of the interlaboratorystudy.TABLE 1 lnterlaboratory Study of the Torque Strength ofAnaerobic AdhesivesAdhesiveBreakawayTorque, lbf/in.95 %, limit, lbf/in.Repeatability ReproducibilityG39164D 78 79 201E 95 79 242A9287F 137
27、 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 246D 264 159 254C 276 132 293E 283 174 185D 5649 01 (2008)211.1.1 The terms repeatability and reproducibility limit areused as
28、 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 there is no accepted reference material,method, or laboratory suitable for determining the bias for theprocedure in this test method for meas
29、uring 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
30、 of 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 f
31、ive 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
32、 committee, 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 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).D 5649 01 (2008)3
