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).
|Genre:||Health and Food|
|Published (Last):||25 December 2006|
|PDF File Size:||16.78 Mb|
|ePub File Size:||9.8 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. A dial gage could replace the transducer for manual reading. Until 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.
These errors are not present in Method C. The modulus of elasticity is also referred to as the flexural modulus. The test proceeds at a constant rate of loading until either sufficient deflection readings are recorded or until failure occurs, depending upon purpose.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Standard – Standard Test Methods for Structural Panels in Flexure ASTM D –
Structural panels in use d33043 plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers. Method B is a 4 point test with Two-Point Flexure in the middle of the board. In cases where excessive local deformation may occur, suitable bearing plates shall be used. 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.
Control of Moisture Content 4. Moments applied to fail specimens tested by Method A, B or D in which large deflections occur can be considerably larger than nominal. NOTE 7—A test rate to achieve the average failure load for the sample in approximately 1 min will differ from that to achieve a lower percentile load for the same sample in approximately 1 asym. This method uses a span to depth ratio, specimen width, test fixture and test speed that make the method well suited for quality assurance.
We are confident that we have what you are looking for.
Carefully controlled investigations may require specification or construction of more precise equipment. Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers. The rate of load application shall be such that the maximum fiber strain rate is equal to 0.
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. These properties are of primary importance in most structural uses of panels whether in construction for floors, wall sheathing, roof decking, concrete form, or various space plane structures; packaging and materials handling for containers, crates, or pallets; or structural components such as stress-skin panels.
Specimen size and span above certain minimums are quite flexible. The test proceeds at a constant rate of head motion until either sufficient deflection data in the elastic range have been gathered or until specimen failure occurs.
Limitation on size may be imposed by equipment size or moment capacity or size of available material. Modulus of Rupture can also be determined however it is subject to a notable degree of error asrm on the bottom span, loading points, and the total deflection at failure. NOTE 6—In cutting the specimen to meet the length requirement, it is not intended that the length be changed for small deviations in thickness.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. All three points shall lie on the longitudinal axis of the specimen. Historical Version s – view previous versions of standard. The choice of method will zstm dictated by the purpose of d30433 test, type of material, and equipment availability.
NOTE 8—For oriented strand board, the following equation provides loading rates within these guidelines: Reading of the dial gage to the nearest 0. In some cases closer spacing may be entirely satisfactory. 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. For a discussion of these errors, their effects, and methods for reducing them, refer to Appendix X1.
There are many sizes available and they are usually specified by the customer. Four methods of tests astmm included:. The input shaft of each rotation gage is fitted with a flange and small V-blocks which rest on the pins projecting from the panel at each gage point, thus transmitting the angular rotation of the panel to the gage and supporting the rotation gage-reference rod assembly.
When the principal direction of the face plies, laminations, strands, or wafers is parallel to the span, the length 2 Annual Book of ASTM Standards, Vol Dd3043 published as D — It should be asfm that the span is based on the nominal thickness of the material and it is not intended that the spans be changed for small variations in thickness.
When nonuniform material containing density variation, knots, knot-holes, sloping grain or other sources of large variability is tested for general construction and industrial use, d30433 minimum specimen width of 24 in.
Last previous edition D — The supports shall be such that no appreciable crushing of the specimen will occur at these points during the test.
A 3 or 4 point bend testing jig may be used to perform the respective test. A description of the test method shall include equipment used to apply loads or moments to the panel, their points of application, deformation measuring equipment, and geometry of deformation measured.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Standard Test Methods for Structural Panels in Flexure
Conditioning of test material at controlled atmospheres to control test moisture content and determination of specific gravity are recommended. 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. Specimens with veneer shall be 3d043 of visible knots or voids. Method C generally is preferred where size of test material permits.
The strips can be of varying sizes, however asrm is important that technicians record and use the same size specimen when comparing results.