ASTM B1021-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B1021 − 21
Standard Test Method for
Peel Resistance of Metal Sheets Joined by High Strength
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Bonds
This standard is issued under the fixed designation B1021; 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.
1. Scope 3.1.1 For definitions of the terms used in this test method
not explicitly found here, see D907 – 15.
1.1 This test method covers the determination of the relative
3.1.2 adherend, n—a body bonded to another body.
peel resistance of cohesive or adhesive bonds between two
3.1.3 adhesive bond, n—a bond between two adherends
adherends when tested under specified preparation and testing
formed by an intermediate substance capable of holding
conditions.
materials together by surface attachment.
1.2 The values stated in SI units are to be regarded as the
3.1.4 cohesive bond, n—a bond between two adherends
standard. The values given in parentheses are English units
formed by solid state diffusion where the atoms of two solid,
provided for information purposes only.
metallic surfaces intersperse themselves.
1.3 This standard does not purport to address all of the
3.1.5 energy release rate, n—the force per unit width of
safety concerns, if any, associated with its use. It is the
bond line times the increment in crosshead displacement
responsibility of the user of this standard to establish appro-
divided by the increase in debond length of the two adherends.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.1.6 hot isostatic pressing (HIP), n—a method of diffusion
1.4 This international standard was developed in accor-
bonding two sheets of metal such as aluminum or titanium.
dance with internationally recognized principles on standard-
3.1.7 peel strength, n—the average force per unit width of
ization established in the Decision on Principles for the
bond line required to progressively separate a flexible member
Development of International Standards, Guides and Recom-
from a rigid member or another flexible member.
mendations issued by the World Trade Organization Technical
3.2 Definitions of Terms Specific to This Standard:
Barriers to Trade (TBT) Committee.
3.2.1 ductile, adj—indicates that the adherends are ductile
or flexible enough to permit bending them through an angle up
2. Referenced Documents
to 120° without cracking or breaking. The subject peel test
2
2.1 ASTM Standards:
method uses sample lever-arms to provide backing support to
B209/B209M Specification for Aluminum and Aluminum-
limit the bend radius when peel testing high strength bonds
Alloy Sheet and Plate
between metal sheets.
D907 Terminology of Adhesives
3.2.2 parasitic tab bending force, n—the force required to
D1876 Test Method for Peel Resistance of Adhesives (T-
bend the peel specimen tabs of two unbonded adherends.
Peel Test)
3.2.2.1 Discussion—The parasitic force must be measured
E4 Practices for Force Calibration and Verification of Test-
so that it can be subtracted from the peel test force to measure
ing Machines
the net peel force of debonding.
3. Terminology
4. Summary of Test Method
3.1 Definitions:
4.1 This test method consists of testing two adherends that
are bonded together. The unbonded tabs of the adherends are
clamped to opposing lever-arms (sample arms) that rotate
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This test method is under the jurisdiction of ASTM Committee B07 on Light
downwardtopeelthebondline.Thetestfixtureandthesample
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
arms are shown in Fig. 1.
Testing.
Current edition approved Dec. 1, 2021. Published January 2022. DOI: 10.1520/
5. Significance and Use
B1021-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 Use this test method for acceptance and process control
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
testing. This test method may be used as an alternative to Test
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Method D1876 when the bond strength is sufficiently high that
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B1021 − 21
FIG. 1 Lever-Arm Peel Test Fixture
failure of the pulling tabs may occur before peeling initiates. 6.3 Peel Fixture—The peel fixture, shown schematically in
This
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