ASTM D5868-01

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Designation:D5868–01
Standard Test Method for
Lap Shear Adhesion for Fiber Reinforced Plastic (FRP)
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Bonding
This standard is issued under the fixed designation D 5868; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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1. Scope E 4 Practices for Force Verification of Testing Machines
2.2 SAE Standard:
1.1 This test method describes a lap shear test for use in
SAE J1525 Lap Shear Test forAutomotive-TypeAdhesives
measuring the bonding characteristics of adhesives for joining
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for Fiber Reinforced Plastic (FRP) Bonding
fiber reinforced plastics to themselves and to metals. The
method is applicable to random and fiber oriented FRP.
3. Terminology
1.2 ThistestmethodisintendedtocomplementTestMethod
3.1 Adhesive terminology for this test method is covered in
D 1002 and extend the application to single-lap shear adhesive
Terminology D 907.
joints of fiber-reinforced plastic (FRP) adherends. This test
method is useful for generating comparative apparent shear
4. Summary of Test Method
strength data for joints made from a number of FRP materials,
4.1 This test method describes a procedure for the testing of
providing a means by which FRP surface treatments may be
lap shear bond strengths, using composite materials not rec-
compared.
ommended in Test Method D 3163 such as FRP.
1.3 The values stated in inch-pound units are to be regarded
as the standard. The SI values in parentheses are for informa-
5. Significance and Use
tion only.
5.1 Due to the increased use of adhesively-bonded FRPas a
1.4 This standard does not purport to address all of the
result of the inherent advantages afforded by bonded rather
safety concerns, if any, associated with its use. It is the
than mechanically-fastened joints (particularly the alleviation
responsibility of the user of this standard to establish appro-
of stress risers and stress cracking), there is a need for tests by
priate safety and health practices and determine the applica-
which joints of various FRP substrates and adhesives may be
bility of regulatory limitations prior to use.
compared. This test method is intended to meet such a need.
5.2 Additional information on significance and use may be
2. Referenced Documents
found in Guide D 4896.
2.1 ASTM Standards:
D 1002 Test Method forApparent Shear Strength of Single-
6. Interference
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
6.1 Apparent shear strength may be affected by substrate
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sion Loading (Metal-to-Metal)
properties, such as moisture absorption and strength.
D 2093 PracticeforPreparationofSurfacesofPlasticsPrior
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to Adhesive Bonding
7. Apparatus
D 3163 Test Method for Determining the Strength of Ad-
7.1 Testing Machine, conforming to the requirements and
hesively Bonded Rigid Plastic Lap-Shear Joints in Shear
having the capabilities of the machine in Practices E 4 with
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by Tension Loading
self-aligning grips capable of securely grasping the specimen
D 4896 Guide for Use of Adhesive-Bonded Single Lap-
throughout the test without allowing the specimen to slip.
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Joint Specimen Test Results
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D 907 Terminology of Adhesives
8. Procedure
D 5573 Practice for Classifying Failure Modes in Fiber-
8.1 Test Substrate:
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Reinforced-Plastic (FRP) Joints
8.1.1 Substrates—Fiber reinforced plastic (FRP) as speci-
fied, with metal composition (heat treat, temper, and condition)
and roughness as specified when bonding FRP to metal.
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This test method is under the jurisdiction of ASTM Committee D14 on
AdhesivesandisthedirectresponsibilityofSubcommitteeD14.40onAdhesivesfor
Plastics.
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Current edition approved March 10, 2001. Published May 2001. Originally Annual Book of ASTM Standards, Vol 03.01.
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published as D 5868 - 95. Last previous edition D 5868 - 95. Available from the Society of Automotive Engineers, 400 Commonwealth
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Annual Book of ASTM Standards, Vol 15.06. Drive, Warrendale, PA 15096-0001.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5868
8.1.2 Dimensions—Cut fiber-reinforced plastic parts into
flatcoupons1by4in.(25.4by100mm)atanominalthickness
of 0.1 in. (2.5 mm). In the case of FRP-to-metal bonding, use
metal with a nominal thickness of 0.06 in. (1.5 mm). It is
recommended that a diamond tip water-cooled saw blade be
used,oracuttingmethodcapableofproducingsharpcutedges.
8.2 Surface Preparations:
8.2.1 Prepare the surface of the FRP in accordance with
Practice D 2093, or as recommended by the adhesive manu-
FIG. 1 Lap Shear Overlay
facturer. Surface roughening, solvent cleaning, and
...