1、Designation: D 5868 01 (Reapproved 2008)Standard Test Method forLap Shear Adhesion for Fiber Reinforced Plastic (FRP)Bonding1This standard is issued under the fixed designation D 5868; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the 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 describes a lap shear test for use inmeasuring the bonding characteristics of adhesive
3、s for joiningfiber reinforced plastics to themselves and to metals. Themethod is applicable to random and fiber oriented FRP.1.2 This test method is intended to complement Test MethodD 1002 and extend the application to single-lap shear adhesivejoints of fiber-reinforced plastic (FRP) adherends. Thi
4、s testmethod is useful for generating comparative apparent shearstrength data for joints made from a number of FRP materials,providing a means by which FRP surface treatments may becompared.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are m
5、athematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 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
6、 health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 907 Terminology of AdhesivesD 1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)
7、D 2093 Practice for Preparation of Surfaces of Plastics Priorto Adhesive BondingD 3163 Test Method for Determining Strength of Adhe-sively Bonded Rigid Plastic Lap-Shear Joints in Shear byTension LoadingD 4896 Guide for Use of Adhesive-Bonded Single Lap-Joint Specimen Test ResultsD 5573 Practice for
8、 Classifying Failure Modes in Fiber-Reinforced-Plastic (FRP) JointsE4 Practices for Force Verification of Testing Machines2.2 SAE Standard:SAE J1525 Lap Shear Test for Automotive-Type Adhesivesfor Fiber Reinforced Plastic (FRP) Bonding33. Terminology3.1 Adhesive terminology for this test method is c
9、overed inTerminology D 907.4. Summary of Test Method4.1 This test method describes a procedure for the testing oflap shear bond strengths, using composite materials not rec-ommended in Test Method D 3163 such as FRP.5. Significance and Use5.1 Due to the increased use of adhesively-bonded FRP as ares
10、ult of the inherent advantages afforded by bonded ratherthan mechanically-fastened joints (particularly the alleviationof stress risers and stress cracking), there is a need for tests bywhich joints of various FRP substrates and adhesives may becompared. This test method is intended to meet such a n
11、eed.5.2 Additional information on significance and use may befound in Guide D 4896.6. Interference6.1 Apparent shear strength may be affected by substrateproperties, such as moisture absorption and strength.7. Apparatus7.1 Testing Machine, conforming to the requirements andhaving the capabilities of
12、 the machine in Practices E4with1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.40 onAdhesives forPlasticsCurrent edition approved April 1, 2008. Published April 2008. Originallyapproved in 1995. Last previous edition
13、 approved in 2001 as D 5868 - 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.3Available from Society of A
14、utomotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.self-aligning grips capable of securely grasping the specimenthroughout the test without all
15、owing the specimen to slip.8. Procedure8.1 Test Substrate:8.1.1 SubstratesFiber reinforced plastic (FRP) as speci-fied, with metal composition (heat treat, temper, and condition)and roughness as specified when bonding FRP to metal.8.1.2 DimensionsCut fiber-reinforced plastic parts intoflat coupons 1
16、 by 4 in. (25.4 by 100 mm) at a nominal thicknessof 0.1 in. (2.5 mm). In the case of FRP-to-metal bonding, usemetal with a nominal thickness of 0.06 in. (1.5 mm). It isrecommended that a diamond tip water-cooled saw blade beused, or a cutting method capable of producing sharp cut edges.8.2 Surface P
17、reparations:8.2.1 Prepare the surface of the FRP in accordance withPractice D 2093, or as recommended by the adhesive manu-facturer. Surface roughening, solvent cleaning, and surfaceprimers are acceptable, provided they do not reduce the FRPbulk properties. Use surface preparation adaptable to actua
18、lproduction conditions.8.2.2 Prepare the surfaces of metals to eliminate burrs orbevels. Clean and dry them or surface treat them prior tobonding by using procedures prescribed by the adhesivemanufacturer.8.3 Preparation of Test Joints:8.3.1 Applications of AdhesiveApply the adhesive inaccordance wi
19、th the adhesive suppliers recommendations oras documented in the test report. In the case of two-partadhesives, mix in accordance with the suppliers suggestedprocedures.8.3.2 Adhesive CureCure the adhesive at room tempera-ture or elevated temperature using prescribed conditions deter-mined by the ad
20、hesive supplier.8.3.3 Joint GeometryControl joint geometry by appropri-ate fixturing, using glass beads or other suitable means tocontrol a 0.03-in. (0.76-mm) adhesive bondline thickness. Usethe minimum number of glass beads in the glueline needed tohold bondline thickness. Fixturing pressure is all
21、owed. Lapshear overlap will be 1 by 1 in. (25.4 by 25.4 mm). (See Fig.1.)8.3.4 ConditioningAllow bonded parts to cool to roomtemperature for at least1hifelevated temperature cures areemployed. If the adhesive is room-temperature cured, allowfull-cure time plus 10 % prior to testing.8.4 Testing:8.4.1
22、 Initial grip separation is 3 in. (75 mm) with 1 in. (25.4mm) minimum of each sample end held in the test grips.8.4.2 The specimen loading rate is 0.5 in. (13 mm)/min.Note that a loading rate of 0.5 is an important differencecompared to other ASTM standards.8.4.3 Prepare a minimum of five lap shear
23、samples in eachcase and test.9. Report9.1 Report the following information:9.1.1 Complete identification of the adhesive tested, includ-ing type and manufacturers code number.9.1.2 Complete identification of the substrates used (includ-ing type of resin and fiber orientation) and method of surfacepr
24、eparation prior to bonding.9.1.3 Cure schedule time and temperature for bondingsample, as well as any other conditions, such as sampleconditioning, environmental exposures, etc.9.1.4 Individual peak load values, psi (kPa) and averages bymaximum and minimum values.9.1.5 Test temperature and condition
25、s.9.1.6 Type of failure (such as fiber tear, cohesive, adhesive)should be reported, in accordance with Practice D 5573.10. Precision and Bias10.1 No information is presented about either the precisionor bias of this test method because resources necessary fortesting have not been forthcoming. It is
26、intended that data willbe produced by October 2002.11. Keywords11.1 composite; FRP; lap shearASTM 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 determinati
27、on 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 reapproved or withdr
28、awn. 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 feel that your
29、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).FIG. 1 Lap Shear OverlayD 5868 01 (2008)2
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