ASTM D3043-00
(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...
General Information
Relations
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 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. Scope specimens cut from large specimens tested by Method C.
However, it may be used to determine the effects of finger
1.1 These test methods determine the flexural properties of
joints, veneer joints and gaps, and other features which can be
strips cut from structural panels or panels up to 4 by 8 ft in size.
placed entirely between the load points and whose effects can
Structural panels in use include plywood, waferboard, oriented
be projected readily to full panel width. Deflection and
strand board, and composites of veneer and of wood-based
modulus of elasticity obtained from this method are related to
layers. Four methods of tests are included:
flexural stress only and do not contain a shear component.
Sections
Significant errors in modulus of rupture can occur when
Method A—Center-Point Flexure Test 5
nominal moment is used (see Appendix X1).
Method B—Two-Point Flexure Test 6
1.4 Method C, Pure Moment Test—This method is ideally
Method C—Pure Moment Test 7
suited for evaluating effects of knots, knot-holes, areas of
Method D—Flexure Test for Quality Assurance 8
sloping grain, and patches for their effect on standard full-size
The choice of method will be dictated by the purpose of the
panels. It is equally well suited for testing uniform or clear
test, type of material, and equipment availability. All methods
material whenever specimen size is adequate. Measured defor-
are applicable to material that is relative uniform in strength
mation and elastic constants are free of shear deformation
and stiffness properties. Only Method C should be used to test
effects; and panels can be bent to large deflections without
material suspected of having strength or stiffness variations
incurring errors from horizontal force components occurring in
within a panel caused by density variations, knots, knot-holes,
other methods. Specimen size and span above certain mini-
areas of distorted grain, fungal attack, or wide growth varia-
mums are quite flexible. It is preferred when equipment is
tions. However, Method B may be used to evaluate certain
available.
features such as core gaps and veneer joints in plywood panels
1.5 Method D, Flexure Test for Quality Assurance—This
where effects are readily projected to full panels. Method C
method, like Method A, is well suited to the investigation of
generally is preferred where size of test material permits.
factors that influence bending strength and stiffness properties.
Moments applied to fail specimens tested by Method A, B or D
Also like Method A, this method uses small specimens in a
in which large deflections occur can be considerably larger
center-point simple span test configuration. This method uses a
than nominal. An approximate correction can be made.
span to depth ratio, specimen width, test fixture and test speed
1.2 Method A, Center-Point Flexure Test—This method is
that make the method well suited for quality assurance. The
applicable to material that is uniform with respect to elastic and
method is frequently used for quality assurance testing of
strength properties. Total deflection, and modulus of elasticity
oriented strand board.
computed from it, include a relatively constant component
1.6 All methods can be used to determine modulus of
attributable to shear deformation. It is well suited to investi-
elasticity with sufficient accuracy. Modulus of rupture deter-
gations of many variables that influence properties uniformly
mined by Methods A, B or D is subject to errors up to and
throughout the panel in controlled studies and to test small,
sometimes exceeding 20 % depending upon span, loading, and
defect-free control specimens cut from large panels containing
deflection at failure unless moment is computed in the rigorous
defects tested by the large-specimen method.
manner outlined in Appendix X1 or corrections are made in
1.3 Method B, Two-Point Flexure Test—This method, like
other ways. These errors are not present in Method C.
Method A, is suited to the investigation of factors that influence
1.7 When comparisons are desired between results of speci-
strength and elastic properties uniformly throughout the panel,
men groups, it is good practice to use the same method of test
in controlled studies, and to testing small, defect free control
for all specimens, thus eliminating possible differences relat-
able to test method.
1.8 This standard does not purport to add
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.