1、Designation: D 2094 00 (Reapproved 2006)Standard Practice forPreparation of Bar and Rod Specimens for Adhesion Tests1This standard is issued under the fixed designation D 2094; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar 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 practice describes bar- and rod-type butt-joinedadhesion test specimens and procedures for preparing andbo
3、nding 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 D 2095.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with it
4、s 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.1.3 The values stated in SI units are considered to be thestandard. The values in parentheses are for information
5、only.2. Referenced Documents2.1 ASTM Standards:2D 907 Terminology of AdhesivesD 2093 Practice for Preparation of Surfaces of Plastics Priorto Adhesive BondingD 2095 Test Method for Tensile Strength of Adhesives byMeans of Bar and Rod SpecimensD 2651 Guide for Preparation of Metal Surfaces for Adhe-s
6、ive Bonding2.2 ASTM Adjuncts:Alignment Fixture Drawings33. Terminology3.1 DefinitionsMany terms in this practice are defined inTerminology D 907.4. Significance and Use4.1 The procedures outlined in this practice are designed tostandardize the test specimens, surface preparations, combina-tions of m
7、aterials, and 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 bars
8、pecimen (Fig. 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 materia
9、ls isdifficult 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 end
10、s of the bar 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 l
11、aminated flat 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
12、of the lamina, 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.
13、7 by 12.7-mm (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.1Precision and Bias This practice is under the jurisdiction of ASTM CommitteeD14 onAdhes
14、ives and is the direct responsibility of Subcommittee D14.80 on MetalBonding Adhesives.Current edition approved Oct. 1, 2006. Published October 2006. Originallyapproved in 1962. Last previous edition approved in 2000 as D 2094 00e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org
15、, 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 available from ASTM International Headqu
16、arters. Order Adjunct No.ADJD2094. Original adjunct produced in 1966.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 Surface Preparation of Adherends:5.3.1 Prepare specimen surfaces in accordance with recom-mendations of the adhe
17、sive manufacturer, unless it is desired toevaluate other methods of preparation, or, unless in the case ofspecific surfaces, other methods are considered superior (seeGuide D 2651).5.3.2 The minimum acceptable method for preparation ofmetallic adherend surfaces, instead of a chemical treatment,consi
18、sts 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 PracticeD 2093.5.4 Reuse of Adherend
19、s:5.4.1 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 Dim
20、ensional 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 a
21、ssembly 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 proce
22、ss. Fixtures 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 perm
23、its processing 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 hol
24、e shall 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 6 7 min.FIG. 2 Rod Sp
25、ecimenD 2094 00 (2006)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 Al
26、ignment Fixture for Bar and Rod Adhesion Test SpecimensD 2094 00 (2006)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 en
27、d of the 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.7.8. Keywords8.1 adhesion; adhesive
28、; bar; butt-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, an
29、d 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 reapproved or withdrawn. Your comments are invited either for revisi
30、on 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 feel that your comments have not received a fair hearing you sh
31、ouldmake 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).FIG. 5 Modification of Alignment FixtureFIG. 6 Specimen Alignment TolerancesD 2094 00 (2006)4
