ASTM D3983-98(2004)

Standard Test Method for Measuring Strength and Shear Modulus of Nonrigid Adhesives by the Thick-Adherend Tensile-Lap Specimen

SIGNIFICANCE AND USE
This test method is capable of providing shear modulus and shear strength values for adhesives with accuracy suitable for use by design engineers in predicting the characteristics of building assemblies bonded with nonrigid adhesives. Adhesive formulators will also find the method useful during the development of new adhesive systems. In general, the thick adherend lap-shear test is a useful tool in research during studies of both short- and long-term load-deformation properties of adhesives. This thick adherend lap-shear test yields a uniformity of stress distribution approaching that obtained in thin tubular butt joints subjected to torsion, which is considered to be a condition of pure shear.
The user is cautioned that pure shear strength cannot be obtained by this test method, because some tensile and compression stresses and stress concentrations are present in the joint. The estimate of shear strength by this test method will be conservative. If pure shear strength is demanded, then Test Method E 229 should be used.
SCOPE
1.1 This test method describes a method of measuring the shear modulus and rupture stress in shear of adhesives in bonded joints. The method employs lap-shear specimens with wood, metal, or composite adherends, with adhesives having shear moduli ranging up to 700 MPa (100 000 psi). This test method is suitable generally for joints in which the ratio of adherend tensile modulus to adhesive shear modulus is greater than 300 to 1. It is not suitable for adhesives that have a high shear modulus in the cured state and that also require elimination of volatile constituents during cure.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2004
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.70 - Construction Adhesives

Relations

• Replaces: ASTM D3983-98 - Standard Test Method for Measuring Strength and Shear Modulus of Nonrigid Adhesives by the Thick-Adherend Tensile-Lap Specimen
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D3983-98(2011) - Standard Test Method for Measuring Strength and Shear Modulus of Nonrigid Adhesives by the Thick-Adherend Tensile-Lap Specimen
• Effective Date: 01-Jan-2011
• Referred By: ASTM D4896-01(2016) - Standard Guide for Use of Adhesive-Bonded Single Lap-Joint Specimen Test Results
• Effective Date: 01-Apr-2004
• Referred By: ASTM D907-15(2023) - Standard Terminology of Adhesives
• Effective Date: 01-Apr-2004
• Referred By: ASTM D5574-94(2021) - Standard Test Methods for Establishing Allowable Mechanical Properties of Wood-Bonding Adhesives for Design of Structural Joints
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6465-99(2016) - Standard Guide for Selecting Aerospace and General Purpose Adhesives and Sealants
• Effective Date: 01-Apr-2004

Standards Content (Sample)

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
Designation:D3983–98(Reapproved2004)
Standard Test Method for
Measuring Strength and Shear Modulus of Nonrigid
1
Adhesives by the Thick-Adherend Tensile-Lap Specimen
This standard is issued under the fixed designation D3983; 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 E104 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions
1.1 This test method describes a method of measuring the
E229 Test Method for Shear Strength and Shear Modulus of
shear modulus and rupture stress in shear of adhesives in
3
Structural Adhesives
bonded joints. The method employs lap-shear specimens with
wood, metal, or composite adherends, with adhesives having
3. Terminology
shear moduli ranging up to 700 MPa (100 000 psi). This test
3.1 Definitions—For definitions of terms used in this test
method is suitable generally for joints in which the ratio of
method, refer to Terminologies E6 and D907.
adherend tensile modulus to adhesive shear modulus is greater
3.1.1 initial tangent modulus, n—the slope of the stress-
than 300 to 1. It is not suitable for adhesives that have a high
strain curve at the origin.
shear modulus in the cured state and that also require elimina-
3.1.2 nominal stress, n—the stress at a point calculated on
tion of volatile constituents during cure.
the net cross section by simple elastic theory without taking
1.2 The values stated in SI units are to be regarded as
into account the effect on the stress produced by discontinuities
standard. The values given in parentheses are for information
such as holes, grooves, fillets, etc.
only.
3.1.3 normal stress, n—the stress component perpendicular
1.3 This standard does not purport to address all of the
to a plane on which the forces act, that is, the plane of the
safety concerns, if any, associated with its use. It is the
bondline.
responsibility of the user of this standard to establish appro-
3.1.4 proportional limit, n—the maximum stress that a
priate safety and health practices and determine the applica-
material is capable of sustaining without significant deviation
bility of regulatory limitations prior to use.
from proportionality of stress to strain.
2. Referenced Documents 3.1.5 secant modulus, n—the slope of the secant drawn
2 from the origin to any specified point on the stress-strain curve.
2.1 ASTM Standards:
3.1.5.1 Discussion—Modulus is expressed in force per unit
D143 Test Methods for Small Clear Specimens of Timber
2
area (MPa, lb/in. , etc.).
D905 Test Method for Strength Properties of Adhesive
3.1.6 shear modulus, n—the ratio of shear stress to corre-
Bonds in Shear by Compression Loading
sponding shear strain below the proportional limit. (Compare
D907 Terminology of Adhesives
secant modulus.)
D1151 Practice for Effect of Moisture and Temperature on
3.1.6.1 Discussion—The term shear modulus is generally
Adhesive Bonds
reserved for materials that exhibit linear elastic behavior over
D2651 Guide for Preparation of Metal Surfaces for Adhe-
most of their stress-strain diagram. Many adhesives exhibit
sive Bonding
curvilinear or nonelastic behavior, or both, in which case some
E6 TerminologyRelatingtoMethodsofMechanicalTesting
other term, such as secant modulus, may be substituted.
E83 Practice for Verification and Classification of Exten-
3.1.7 shear strain, n—the tangent of the angular change,
someter Systems
due to force, between two lines originally perpendicular to
each other through a point in the body.
1
This test method is under the jurisdiction of ASTM Committee D14 on
3.1.7.1 Discussion—Shear strain equals adherend slip/
Adhesives and is the direct responsibility of Subcommittee D14.70 on Construction
adhesive layer thickness.
Adhesives.
Current edition approved April 1, 2004. Published April 2004. Originally
3.1.8 shear strength, n—in an adhesive joint, the maximum
approved in 1981. Last previous edition approved in 1998 as D3983 – 98. DOI:
average stress when a force is applied parallel to the joint.
10.1520/D3983-98R04.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
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D3983–98 (2004)
3.1.8.1 Discussion—In most adhesive test methods, the
she
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