ASTM D3044-94

Standard Test Method for Shear Modulus of Wood-Based Structural Panels

SCOPE
1.1 This test method covers determination of the shear modulus of wood-based structural panels associated with shear distortion in the plane of the panels. The method is applicable to all types of wood-based structural panels. The grain direction or orientation of the individual plies, laminations, or layers shall be parallel or perpendicular to the edge of the test specimen. If the plies, laminations, or layers are of different material or elastic properties, the method gives the effective shearing modulus. Wood-based structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers.
Note 1--This test method is primarily designed for material in which the grain or orientation of the individual plies, laminations, or layers is parallel or perpendicular to the edge of the specimen. It may be used, however, for plywood specimens in which the grain is at 45o to the specimen edges if a four-ply panel with all plies of the same thickness is used. The controlling condition is that the EI (modulus of elasticity X moment of inertia) values along both diagonals shall be equal.
1.2 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-Dec-1999
• Technical Committee: D07 - Wood
• Drafting Committee: D07.03 - Panel Products

Relations

• Replaced By: ASTM D3044-94(2000) - Standard Test Method for Shear Modulus of Wood-Based Structural Panels
• Effective Date: 01-Jan-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3044 – 94
Standard Test Method for
Shear Modulus of Wood-Based Structural Panels
This standard is issued under the fixed designation D 3044; 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.
1. Scope from load-deflection data. The shear modulus obtained is that
associated with shearing distortion in the plane of the plate. A
1.1 This test method covers determination of the shear
photograph of testing apparatus and a deflection measuring
modulus of wood-based structural panels associated with shear
device is given in Fig. 1.
distortion in the plane of the panels. The method is applicable
to all types of wood-based structural panels. The grain direc-
4. Significance and Use
tion or orientation of the individual plies, laminations, or layers
4.1 This test method is most useful for determining the
shall be parallel or perpendicular to the edge of the test
moduli of rigidity of orthotropic materials for which moduli of
specimen. If the plies, laminations, or layers are of different
rigidity cannot be computed from elastic moduli and Poisson’s
material or elastic properties, the method gives the effective
ratios. The shear modulus determined by this method appears
shearing modulus. Wood-based structural panels in use include
in the equation governing the bending of a plate. This is the
plywood, waferboard, oriented strand board, and composites of
modulus that is needed in discussing the deflection and
veneer and of wood-based layers.
buckling of plates.
NOTE 1—This test method is primarily designed for material in which
the grain or orientation of the individual plies, laminations, or layers is
5. Control of Moisture Content
parallel or perpendicular to the edge of the specimen. It may be used,
5.1 The structural panel samples to be tested at specific
however, for plywood specimens in which the grain is at 45° to the
moisture contents or equilibrium relative humidities shall be
specimen edges if a four-ply panel with all plies of the same thickness is
conditioned to approximately constant mass in controlled
used. The controlling condition is that the EI (modulus of
elasticity 3 moment of inertia) values along both diagonals shall be equal. atmospheric conditions. For approximating moisture condi-
tions of panels used under dry conditions, a relative humidity
1.2 This standard does not purport to address all of the
of 65 6 2 % at a temperature of 68 6 6°F (206 3°C) is
safety concerns, if any, associated with its use. It is the
recommended. Specimens shall be tested without undue delay
responsibility of the user of this standard to establish appro-
after conditioning. Testing in similarly controlled atmosphere
priate safety and health practices and determine the applica-
is recommended whenever possible.
bility of regulatory limitations prior to use.
6. Test Specimen
2. Referenced Documents
6.1 The test specimen shall be square, with the thickness
2.1 ASTM Standards:
equal to the thickness of the material, and the length and width
D 2395 Test Methods for Specific Gravity of Wood and
2 not less than 25 nor more than 40 times the thickness. The
Wood-Base Materials
thickness, length, and width of each specimen shall be mea-
D 4442 Test Methods for Direct Moisture Content Measure-
2 sured to an accuracy of not less than6 0.3 %. Care shall be
ment of Wood and Wood-Base Materials
taken to avoid obtaining test specimens with initial curvature.
3. Summary of Test Method
7. Loading Procedure
3.1 The test consists of twisting a square plate of material by
7.1 Support the test specimen on supports having a radius of
applying loads at the ends of one diagonal and supporting the
curvature not greater than ⁄4 in. (6 mm) on the opposite ends
plate at the ends of the other diagonal. From theory on the
of a plate diagonal, and loaded in a similar manner on the
flexure of flat plates the deflections of the plate under this
opposite ends of the other diagonal. In order that the loads are
loading is related to the shear modulus of the plate. Deflections
applied at the corners, first attach metal plates as shown in Fig.
of the plate at points on the diagonal are measured relative to
1. Fig. 1 also shows suggested apparatus for applying load and
its center. The shear modulus of the specimen is determined
measuring deflection. Apply the load with a continuous and
uniform motion of the movable head at a rate of 0.012 times
This test method is under the jurisdiction of ASTM Committee D-7 on Wood
the length of the plate in inches or millimetres, expressed in
and is the direct responsibility of Subcommittee D07.03 on Panel Products.
inches or millimetres per minute, within a permissible variation
Current edition approved July 15, 1994. Published September 1994. Originally
of 625 %.
published as D 3044 – 72. Last previous edition D 3044 – 76 (1986).
Annual Book of ASTM Standards, Vol 04.10. 7.2 The load applied shall be accurate to within 1 %.
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