ASTM D2094-2000(2014) Standard Practice for Preparation of Bar and Rod Specimens for Adhesion Tests《附着力试验用棒和杆试样制备的标准操作规程》.pdf

1、Designation: D2094 00 (Reapproved 2014)Standard Practice forPreparation of Bar and Rod Specimens for Adhesion Tests1This standard is issued under the fixed designation D2094; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year

2、 of last revision. 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 practice describes bar- and rod-type butt-joinedadhesion test specimens and procedures for preparing andbondi

3、ng them. The specimens are intended to be used withvarious adherend materials in like or unlike combinations fordetermining the strength properties of adhesives in accordancewith Test Method D2095.1.2 The values stated in SI units are considered to be thestandard. The values in parentheses are for i

4、nformation only.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 determine the applica-bility of regulatory limitations prior to use

5、.2. Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesD2093 Practice for Preparation of Surfaces of Plastics Priorto Adhesive BondingD2095 Test Method for Tensile Strength of Adhesives byMeans of Bar and Rod SpecimensD2651 Guide for Preparation of Metal Surfaces forAdhesiveBonding

6、2.2 ASTM Adjuncts:Alignment Fixture Drawings33. Terminology3.1 DefinitionsMany terms in this practice are defined inTerminology D907.4. Significance and Use4.1 The procedures outlined in this practice are designed tostandardize the test specimens, surface preparations, combina-tions of materials, an

7、d adhesive selection. Because of theflexibility in the procedure, it is important to have some idea ofthe kind of properties that will be observed during testing.5. Test Specimens5.1 GeometryTest specimens conform to the forms anddimensions shown in Fig. 1, Fig. 2,orFig. 3. Only the barspecimen (Fig

8、. 1) shall be used for cleavage strength tests.Only the rod specimen (Fig. 2) or the modified bar specimen(Fig. 3) shall be used for tests in torsional shear.Amodificationof the specimen is permissible in tensile tests with dissimilaradherends, particularly if one of the adherend materials isdifficu

9、lt to machine (for example, glass) or if the strength of theadherend is such that failure under stress occurs at the drilledhole. This modification consists of a sheet of the materialapproximately 19 mm (34 in.) square and 112 to6mm(116 to14 in.) thick inserted and bonded between the ends of the bar

10、 orrod specimens. For comparison purposes, specimen geometryshall be the same unless the effect of insert dimensions is understudy.5.2 Machining of Adherends:5.2.1 Use metal adherends machined from bar or rod stockwith the surface to be bonded finished to 1 m.5.2.2 Machine plastic from laminated fla

11、t panels using adiamond charged wheel for rough machining and a carbide-tipped tool for finish machining. Do all machining dry usingcare not to damage surfaces by overheating or contaminationwith lubricants. Machine laminar materials so that the axis ofthe specimen will lie in the plane of the lamin

12、a, and so that theplane of the lamina coincides with one side of the specimenwith the hole perpendicular to the plane of the lamina. Finishplastic to 80 m or better unless studying surface finish.5.2.3 Nonreinforced plastics (either thermoplastic or ther-mosetting) molded in a 127 by 12.7 by 12.7-mm

13、 (5 by 0.5 by0.5-in.) bar mold, machined to a 38.1 mm (1.5 in.) length anda hole drilled as shown in Fig. 1. Specimens machined fromextruded, cast, or molded plastic rod or sheet are also accept-able.5.3 Surface Preparation of Adherends:1This practice is under the jurisdiction of ASTM Committee D14

14、on Adhesivesand is the direct responsibility of Subcommittee D14.80 on Metal BondingAdhesives.Current edition approved March 1, 2014. Published March 2014. Originallyapproved in 1962. Last previous edition approved in 2006 as D2094 00 (2006).DOI: 10.1520/D2094-00R14.2For referenced ASTM standards, v

15、isit 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.3Detailed working drawings of the fixtures shown in Fig. 4 and Fig. 5 and theirparts are avail

16、able from ASTM International Headquarters. Order Adjunct No.ADJD2094. Original adjunct produced in 1966.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.3.1 Prepare specimen surfaces in accordance with recom-mendations of the adhesiv

17、e manufacturer, unless it is desired toevaluate other methods of preparation, or, unless in the case ofspecific surfaces, other methods are considered superior (seeGuide D2651).5.3.2 The minimum acceptable method for preparation ofmetallic adherend surfaces, instead of a chemical treatment,consists

18、of vapor degreasing with trichloroethylene followedby dipping in methyl ethyl ketone and wiping dry with a clean,lint-free white cotton cloth. Apply adhesive as soon as possibleafter the surfaces are prepared.5.3.3 Prepare plastic adherends in accordance with PracticeD2093.5.4 Reuse of Adherends:5.4

19、.1 Adherends can be reused several times, provided thatall traces of the previously used adhesive are removed and thesurfaces are remachined.5.4.2 Plastic adherends that have been immersed in liquidsor exposed to high humidities or extreme temperature environ-ments shall not be reused.5.4.3 Dimensio

20、nal tolerances shown in Fig. 1, Fig. 2, andFig. 3, except those for length, shall be maintained on reusedadherends.6. Procedure6.1 The preparation of the adhesive for use, its applicationto the adherends, the air drying or precuring of the coatedadherends, and the curing of the adhesive after assemb

21、ly of theadherends shall be done in accordance with procedures recom-mended by the adhesive manufacturer unless other standardprocedures are considered preferable or special procedures arebeing investigated.6.2 Use fixtures that will ensure good alignment of thespecimens during the curing process. F

22、ixtures that have beenfound to be satisfactory for the assembly and alignment ofspecimens are shown in Fig. 4 and Fig. 5. The fixture in Fig. 4is intended for adhesives requiring stresses of the order of 0 to20 psi for their processing. Fig. 5 shows a modification of theFig. 4 fixture that permits p

23、rocessing of adhesives requiringelevated temperatures and high pressures during curing.3Machining Requirements:1. Two adjacent sides shall be ground so that included angle is 90 6 7 min.2. Ends shall be ground perpendicular to the ground sides so that included angle is 90 6 7 min.3. Drilled hole sha

24、ll be perpendicular to one ground side so that included angle is 90 6 7 min.4. Drilled hole shall always be in the same relative position to the ground surfaces as shown on drawing.FIG. 1 Bar SpecimenNOTE 1Ends of specimen and hole shall be perpendicular to the axis within 67 min.FIG. 2 Rod Specimen

25、D2094 00 (2014)26.3 Assemble the bar-type specimens (Fig. 1) with the twoground sides of the specimen aligned to the V-slot of theFIG. 3 Modified Bar Specimen (Laminate)Notes:1. This view shows the bar specimens in place.2. Spacers are removed when fixture is used with rod specimens.FIG. 4 Alignment

26、 Fixture for Bar and Rod Adhesion Test SpecimensD2094 00 (2014)3assembly fixture. The recommended maximum alignment tol-erances of the specimens after assembly and cure are desig-nated in Fig. 6.6.4 Assemble all types of test specimens in the assemblyfixture so that the grip holes at each end of the

27、 specimen areperpendicular to the axis of the specimen and at 90 to eachother as shown in Fig. 6.6.5 The removal of adhesive flash or squeeze-out by filingor grinding is optional for tensile specimens but mandatory fortorsional shear and cleavage specimens.7. Keywords7.1 adhesion; adhesive; bar; but

28、t-joined; preparation; rod;specimenASTM 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 that determination of the validity of any such patent rights, and the risk

29、of 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 reapproved or withdrawn. Your comments are invited either for revision of this

30、 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 feel that your comments have not received a fair hearing you shouldmake y

31、our 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 c

32、ontacting 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).FIG. 5 Modification of Alignment FixtureFIG. 6 Specimen Alignment TolerancesD2094 00 (2014)4