ASTM D – 00 Structural Panels in Flexure – Download as PDF File .pdf), Text File .txt) or read online. ASTM D – Standard Test Methods for Structural Panels in Flexure. GPa). Wilson and Parasin (26) compared two widths of ply wood ( and mm) using the pure-moment bending test in ASTM D (3).
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Ast further innovations are made in pure bending test equipment, use of cable and pulley equipment of this type, either purchased or constructed at the laboratory, offers the only practical means of implementing this method. Method C generally is preferred where size of test material permits.
These errors are not present in Method C. The method is frequently used for quality assurance testing of oriented strand board. This method uses a span to depth ratio, specimen width, test fixture and test speed that make the method well suited for quality assurance. Control of Moisture Content 4. Total deflection, and modulus of elasticity computed from it, include d303 relatively constant component attributable to shear deformation.
Rather, it is intended that the nominal thickness of the material under test should be used for determining the specimen length.
Suitable equipment of the transducer type is illustrated in Fig. 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.
In cases where excessive local deformation may occur, suitable bearing plates shall be used. Except for effects of nonuniformity of properties within a f3043, specimen dimensions do not tend to influence test results.
This method uses a span to depth ratio, specimen width, astmm fixture and test speed that make the method well suited for quality assurance. Material having high rolling shear strength or having all its plies, laminations, strands, or wafers parallel to span may use closer spacing between loads and supports. The principle of a commercially available flexure testing machine complying with these requirements is diagrammed in the figure below. Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers.
Moisture content specimens also serving as specific gravity specimens shall be free of density variations and inner ply c3043 such as knotholes or edge gaps between veneers. 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.
Referenced Documents purchase separately The astk listed below are referenced within the subject standard but are not provided as part of the standard. An approximate correction can be made. Conditioning of test material at controlled atmospheres to control test moisture content and determination of specific gravity are recommended. An approach that reduces the errors, possibly to acceptable limits for many purposes, is to develop a correction to be applied to nominal moment which x3043 with mid-span deflection.
ASTM D – Structural Panel Flex Test
Significant errors in modulus of rupture can occur when nominal moment is used see Appendix X1. We need your help to maintenance this website. In accordance with Test Method D c3043, the test rate shall be such that the sample target failure load would be achieved in approximately 1 min Note 7.
These pins, threaded at one end and having a small rectangular flange, are attached to the panel either by screwing them into small holes in the face of the panel until the flange is drawn tightly against the face or by inserting the pin through a hole in the panel and drawing the flange tight by means of a nut on the opposite side of the panel. The frames shall be free to move toward or away from each other while under load to preclude application of direct tension or compression loads at large panel deformations.
All three points shall lie on the longitudinal axis of the specimen. We offer machines, apparatus, testers, tensile grips, test fixtures, clamps, holders, jigs, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and custom solutions for unique applications.
NOTE 8—For oriented strand board, the following equation provides loading rates within these guidelines: Reading of the dial gage to the nearest 0. Measurements shall be to the nearest 0. Method C—Large Panel Test. A spacing of at least 24 and 12 times specimen thickness is recommended for specimens with the principal direction parallel and perpendicular to span respectively. Specimen size and span above certain minimums are quite flexible.
Rather it is intended that the nominal thickness be used for determining the specimen length and span. Take deflections by the methods indicated in Fig.
ASTM D3043 Flexural Structural Panel Testing Machine
Construction is shown in detail in Fig. Four methods of tests are included:. 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 d3034 the large-specimen method. The characteristically violent failures of large panels will normally dictate removel of delicate measuring instruments from the panel when sufficient data in the elastic range has been obtained.
Standard Test Methods for Structural Panels in Flexure
Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers.
State clearly the method employed in the report. A dial gage could replace the transducer for manual reading. NOTE 5—These limits are liberal in relation to conventional equipment in order to allow for laboratory fabrication and inexperience in the design of precision pure moment machines.
EI 5 MR 8 where: This test method covers the flexural properties of strength and stiffness. If inspection of the edges of panels containing veneer reveals the presence of a knot in any of the inner plies, select a second specimen.
Four methods of tests are included: 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.
All methods are applicable to material that is relatively uniform in strength and stiffness properties.
It is equally well suited for testing uniform or clear material whenever specimen size is adequate. Give our test engineers a call today for help configuring the best test machine and accessories according to your standard. It is well suited to investigations of many variables that influence properties uniformly throughout the panel in controlled studies and to asgm small, defect-free control specimens cut from large panels containing defects tested by the large-specimen method.
Last previous edition D — D load points plus asttm times specimen thickness or 24 times specimen thickness for the principal direction parallel or perpendicular respectively.