Standard Test Method for Thick-Adherend Metal Lap-Shear Joints for Determination of the Stress-Strain Behavior of Adhesives in Shear by Tension Loading

SIGNIFICANCE AND USE
This test method can be used to determine the stress-strain properties of an adhesive in shear and to establish the proportional-limit of the stress-stain relationship. This data may be useful for the design and analysis of adhesively bonded joints.
This test method is not intended to determine adhesion characteristics of an adhesive to a particular substrate; rather this test method is intended to characterize the adhesive shear stress-strain properties that may be relevant for design considerations.
This test method has been developed and applied using bonded aluminum adherends. At this time no assumptions regarding the validity of this test method with non-aluminum adherends can be made.
SCOPE
1.1 This test method covers the preparation and testing of thick-adherend lap-shear samples for the determination of the stress-strain behavior of adhesives.
1.2 This test method covers data reduction and analysis of stress-strain curves obtained using thick-adherend lap-shear samples.
1.3 The values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 7.3.

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Publication Date
31-Mar-2004
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ASTM D5656-04e1 - Standard Test Method for Thick-Adherend Metal Lap-Shear Joints for Determination of the Stress-Strain Behavior of Adhesives in Shear by Tension Loading
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
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Designation: D5656 – 04
Standard Test Method for
Thick-Adherend Metal Lap-Shear Joints for Determination of
the Stress-Strain Behavior of Adhesives in Shear by
1
Tension Loading
This standard is issued under the fixed designation D5656; 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 (´) indicates an editorial change since the last revision or reapproval.
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´ NOTE—Section 7.3 was editorially updated in September 2005.
1. Scope 3.1.1 Many terms in this test method are defined in Termi-
nology D907.
1.1 This test method covers the preparation and testing of
3.2 Definitions of Terms Specific to This Standard:
thick-adherend lap-shear samples for the determination of the
3.2.1 knee, n—inflection point on a load-deflection curve;
stress-strain behavior of adhesives.
the point at which plastic yielding of the adhesive begins to
1.2 This test method covers data reduction and analysis of
dominate the deformation response of the load-deflection
stress-strain curves obtained using thick-adherend lap-shear
curve.
samples.
3.2.2 panel, n—two plates of a rigid material having the
1.3 The values stated in SI units are to be regarded as the
same dimensions that are adhesively bonded together on one
standard. The inch-pound units in parentheses are for informa-
face such that the thickness of the panel is approximately twice
tion only.
the thickness of each individual plate.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 This test method consists of testing thick-adherend
priate safety and health practices and determine the applica-
lap-shear samples whereby a tensile load is applied to the
bility of regulatory limitations prior to use. Specific precau-
sample but the adhesive is placed in shear. Unlike Guide
tionary statements are given in 7.3.
D4896, the adherends used in this standard test method are
2. Referenced Documents thick and rigid, peel forces are minimized and the shear
2
stress-strain properties of the adhesive are obtained. Refer-
2.1 ASTM Standards:
enced data presents a finite element analysis of the thick-
D907 Terminology of Adhesives
adherent metal lap shear specimen and calculates the effect of
D2651 Guide for Preparation of Metal Surfaces for Adhe-
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varying the adherent and adhesive stiffness. User of this
sive Bonding
standard is cautioned that since the stress is not totally uniform
D4896 GuideforUseofAdhesive-BondedSingleLap-Joint
across the over-lap of the specimen, factors such as adhesive
Specimen Test Results
stiffness, adherent stiffness and location of shear strain mea-
E4 Practices for Force Verification of Testing Machines
surement along the length of the bond can affect the experi-
3,4
3. Terminology
mentally obtained load-displacement curve.
3.1 Definitions:
NOTE 1—The peel forces generated during testing are a function of the
bending deformation in the adherends. Greater adherend stiffness results
in less bending and smaller peel forces.
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This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal
Bonding Adhesives.
Current edition approved April 1, 2004. Published April 2004. Originally
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approved in 1995. Last previous edition approved in 2001 as D5656 - 01. DOI: Kassapoglou, C. and Adelmann, John C., “KGR-1 Thick Adherend Specimen
rd
10.1520/D5656-04E01. Evaluation for the Determination of Adhesive Mechanical Properties,” 23 Inter-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or national SAMPE Conference, Oct. 21–24, 1991.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Krieger, R. B., Jr., “Stiffness Characteristics of Structural Adhesives for Stress
Standards volume information, refer to the standard’s Document Summary page on Analysis in Hostile Environment,” American Cyanamid Co., Havre de Grace, MD,
the ASTM website. 1975.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5656 – 04
5. Significance and Use
5.1 This test method can be used to determine the stress-
strain properties of an adhesive in shear and to establish the
proportional-limit of the stress-stain relationship. This data
maybeusefulforthedesignandanalysisofadhesivelybonded
joints.
5.2 This test method is not intended to determine adhesion
characteristics of an adhesive to a particular substrate; rather
this test method is intended to characterize the adhesive
...

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