1、Designation: D 5868 01Standard 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, the year of last
2、 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 adhesives for joiningfiber
3、 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. This testmethod is us
4、eful 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 the standard. The SI values in parentheses are for informa-tion o
5、nly.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 health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenc
6、ed Documents2.1 ASTM Standards:D 1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)2D 2093 Practice for Preparation of Surfaces of Plastics Priorto Adhesive Bonding2D 3163 Test Method for Determining the Strength of
7、 Ad-hesively Bonded Rigid Plastic Lap-Shear Joints in Shearby Tension Loading2D 4896 Guide for Use of Adhesive-Bonded Single Lap-Joint Specimen Test Results2D 907 Terminology of Adhesives2D 5573 Practice for Classifying Failure Modes in Fiber-Reinforced-Plastic (FRP) Joints2E 4 Practices for Force V
8、erification of Testing Machines32.2 SAE Standard:SAE J1525 Lap Shear Test for Automotive-Type Adhesivesfor Fiber Reinforced Plastic (FRP) Bonding43. Terminology3.1 Adhesive terminology for this test method is covered inTerminology D 907.4. Summary of Test Method4.1 This test method describes a proce
9、dure 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 aresult of the inherent advantages afforded by bonded ratherthan mechanically-fastened joints
10、(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 need.5.2 Additional information on significance and use may befound in Guide D 4896.6. Inte
11、rference6.1 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 the machine in Practices E 4 withself-aligning grips capable of securely grasping the spe
12、cimenthroughout the test without allowing 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-reinfor
13、ced plastic parts intoflat coupons 1 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, use1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.40 on Adhesives forPlas
14、tics.Current edition approved March 10, 2001. Published May 2001. Originallypublished as D 5868 - 95. Last previous edition D 5868 - 95.2Annual Book of ASTM Standards, Vol 15.06.3Annual Book of ASTM Standards, Vol 03.01.4Available from the Society of Automotive Engineers, 400 CommonwealthDrive, Warr
15、endale, PA 15096-0001.1Copyright ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.metal 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
16、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
17、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
18、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 Cure Cure the adhesive at room tempera-ture or elevated temperature using prescribed conditions deter-mined by the a
19、dhesive supplier.8.3.3 Joint Geometry Control joint geometry by appro-priate 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 a
20、llowed. Lapshear overlap will be 1 by 1 in. (25.4 by 25.4 mm). (See Fig.1.)8.3.4 Conditioning Allow 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.
21、4.1 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 she
22、ar 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 surfac
23、epreparation 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 condit
24、ions.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
25、is intended that data willbe produced by October 2002.11. Keywords11.1 composite; FRP; lap shearThe American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard. Users of this standard are exp
26、ressly advised that determination of the validity of any suchpatent rights, and the risk 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 revis
27、ed, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsibletechnical committee, which you may attend. If yo
28、u feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM, 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 above address or at610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website (www.astm.org).FIG. 1 Lap Shear OverlayD 58682
