ASTM D3043-00e1
(Test Method)Standard Test Methods for Testing Structural Panels in Flexure
Standard Test Methods for Testing Structural Panels in Flexure
SCOPE
1.1 These test methods determine the flexural properties of strips cut from structural panels or panels up to 4 by 8 ft in size. Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers. Four methods of tests are included: SectionsMethod A-Center-Point Flexure Test5Method B-Two-Point Flexure Test 6 Method C-Pure Moment Test 7 Method D-Flexure Test for Quality Assurance8
The choice of method will be dictated by the purpose of the test, type of material, and equipment availability. All methods are applicable to material that is relative uniform in strength and stiffness properties. Only Method C should be used to test material suspected of having strength or stiffness variations within a panel caused by density variations, knots, knot-holes, areas of distorted grain, fungal attack, or wide growth variations. However, Method B may be used to evaluate certain features such as core gaps and veneer joints in plywood panels where effects are readily projected to full panels. Method C generally is preferred where size of test material permits. Moments applied to fail specimens tested by Method A, B or D in which large deflections occur can be considerably larger than nominal. An approximate correction can be made.
1.2 Method A, Center-Point Flexure Test—This method is applicable to material that is uniform with respect to elastic and strength properties. Total deflection, and modulus of elasticity computed from it, include a relatively constant component attributable to shear deformation. It is well suited to investigations of many variables that influence properties uniformly throughout the panel in controlled studies and to test small, defect-free control specimens cut from large panels containing defects tested by the large-specimen method.
1.3Method B, Two-Point Flexure Test—This method, like Method A, is suited to the investigation of factors that influence strength and elastic properties uniformly throughout the panel, in controlled studies, and to testing small, defect free control specimens cut from large specimens tested by Method C. However, it may be used to determine the effects of finger joints, veneer joints and gaps, and other features which can be placed entirely between the load points and whose effects can be projected readily to full panel width. Deflection and modulus of elasticity obtained from this method are related to flexural stress only and do not contain a shear component. Significant errors in modulus of rupture can occur when nominal moment is used (see Appendix X1).
1.4 Method C, Pure Moment Test—This method is ideally suited for evaluating effects of knots, knot-holes, areas of sloping grain, and patches for their effect on standard full-size panels. It is equally well suited for testing uniform or clear material whenever specimen size is adequate. Measured deformation and elastic constants are free of shear deformation effects; and panels can be bent to large deflections without incurring errors from horizontal force components occurring in other methods. Specimen size and span above certain minimums are quite flexible. It is preferred when equipment is available.
1.5 Method D, Flexure Test for Quality Assurance—This method, like Method A, is well suited to the investigation of factors that influence bending strength and stiffness properties. Also like Method A, this method uses small specimens in a center-point simple span test configuration. This method uses a span to depth ratio, specimen width, test fixture and test speed that make the method well suited for quality assurance. The method is frequently used for quality assurance testing of oriented strand board.
1.6 All methods can be used to determine modulus of elasticity with sufficient accuracy. Modulus of rupture determined by Methods A, B or D is subject to errors up to and sometimes exceeding 20 % depending upon span, loading, and deflection at failur...
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e1
Designation: D 3043 – 00
Standard Test Methods for
1
Structural Panels in Flexure
This standard is issued under the fixed designation D 3043; 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
e NOTE—The values in Note 8 for 7/16 in. panel were corrected editorially in March 2002.
1. Scope 1.3 Method B, Two-Point Flexure Test—This method, like
MethodA,issuitedtotheinvestigationoffactorsthatinfluence
1.1 These test methods determine the flexural properties of
strength and elastic properties uniformly throughout the panel,
stripscutfromstructuralpanelsorpanelsupto4by8ftinsize.
in controlled studies, and to testing small, defect free control
Structural panels in use include plywood, waferboard, oriented
specimens cut from large specimens tested by Method C.
strand board, and composites of veneer and of wood-based
However, it may be used to determine the effects of finger
layers. Four methods of tests are included:
joints, veneer joints and gaps, and other features which can be
Sections
placed entirely between the load points and whose effects can
Method A—Center-Point Flexure Test 5
be projected readily to full panel width. Deflection and
Method B—Two-Point Flexure Test 6
modulus of elasticity obtained from this method are related to
Method C—Pure Moment Test 7
flexural stress only and do not contain a shear component.
Method D—Flexure Test for Quality Assurance 8
Significant errors in modulus of rupture can occur when
The choice of method will be dictated by the purpose of the
nominal moment is used (see Appendix X1).
test, type of material, and equipment availability. All methods
1.4 Method C, Pure Moment Test—This method is ideally
are applicable to material that is relative uniform in strength
suited for evaluating effects of knots, knot-holes, areas of
and stiffness properties. Only Method C should be used to test
sloping grain, and patches for their effect on standard full-size
material suspected of having strength or stiffness variations
panels. It is equally well suited for testing uniform or clear
within a panel caused by density variations, knots, knot-holes,
material whenever specimen size is adequate. Measured defor-
areas of distorted grain, fungal attack, or wide growth varia-
mation and elastic constants are free of shear deformation
tions. However, Method B may be used to evaluate certain
effects; and panels can be bent to large deflections without
features such as core gaps and veneer joints in plywood panels
incurring errors from horizontal force components occurring in
where effects are readily projected to full panels. Method C
other methods. Specimen size and span above certain mini-
generally is preferred where size of test material permits.
mums are quite flexible. It is preferred when equipment is
Moments applied to fail specimens tested by MethodA, B or D
available.
in which large deflections occur can be considerably larger
1.5 Method D, Flexure Test for Quality Assurance—This
than nominal. An approximate correction can be made.
method, like Method A, is well suited to the investigation of
1.2 Method A, Center-Point Flexure Test—This method is
factors that influence bending strength and stiffness properties.
applicabletomaterialthatisuniformwithrespecttoelasticand
Also like Method A, this method uses small specimens in a
strength properties. Total deflection, and modulus of elasticity
center-point simple span test configuration.This method uses a
computed from it, include a relatively constant component
span to depth ratio, specimen width, test fixture and test speed
attributable to shear deformation. It is well suited to investi-
that make the method well suited for quality assurance. The
gations of many variables that influence properties uniformly
method is frequently used for quality assurance testing of
throughout the panel in controlled studies and to test small,
oriented strand board.
defect-free control specimens cut from large panels containing
1.6 All methods can be used to determine modulus of
defects tested by the large-specimen method.
elasticity with sufficient accuracy. Modulus of rupture deter-
mined by Methods A, B or D is subject to errors up to and
sometimes exceeding 20 % depending upon span, loading, and
1
These methods are under the jurisdiction of ASTM Committee D07 on Wood
deflection at failure unless moment is computed in the rigorous
and are the direct responsibility of Subcommittee D07.03 on Panel Products.
manner outlined in Appendix X1 or corrections are made in
Current edition approved Apr. 10, 2000. Published July 2000. Originally
published as D 3043 – 72. L
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