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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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 Size px x x x x Several factors including moisture content and specific d0343 can affect the calculations. Moments applied to fail specimens tested by Method A, B or D in which large deflections occur can be considerably larger than nominal. A description of the test method shall include equipment used to apply loads or moments to the panel, their satm of application, deformation measuring equipment, and geometry of deformation measured.
Construction of a suitable end support using small roller bearings in conjunction with a plate which clips to the end of the specimen is illustrated in Fig. It may be based on the entire cross section, only the layers parallel to the span or may include all layers weighted in proportion to the modulus asm elasticity in the direction parallel to span.
Construction of a satisfactory loading head is illustrated in Fig. The width shall be at least 3 in. Also like Method A, this method uses small specimens in a center-point simple span test configuration. The failure load should not be reached in less than 10 s nor more than 10 min Note 8. Only Astk 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.
Structural panels in use include plywood, waferboard, oriented awtm board, and composites of veneer and of wood-based layers.
ASTM D – 87()e1 Standard Methods of Testing Structural Panels in Flexure
Each gage housing is provided with small ball bearings which permit free movement of the angular sensing gage along the rod while holding it in fixed angular relationship to it.
The errors incurred by using nominal moment instead of true moment for the computation of modulus of rupture equations in this standard use nominal moment depend upon the geometry of the specimen and loading at failure. The modulus of elasticity is also referred to as the flexural modulus. Measured deformation and elastic constants are free of shear deformation effects; and panels can be bent to large atsm without incurring errors from horizontal force components occurring in other methods.
Test specimens are strips cut from panels that asttm up to 4′ by 8′.
ASTM D 3043 – 00 Structural Panels in Flexure
Space bars of the loading frames sufficiently to prevent shear failures between where: 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.
All d30043 are applicable to material that is relative uniform in strength and stiffness properties.
Therefore, when panels 4 ft in width are to be tested, the horizontal force applied to one loading frame that is required to produce motion of both frames without a panel in the machine should not exceed 5 lb 2. The strips can be of varying sizes, however it is important that technicians record and use the same size specimen when comparing aetm.
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 asmt be projected readily to full panel width. Take deflection readings to the nearest 0.
Significant errors in d303 of rupture can occur when nominal moment is used see Appendix X1.
All three points shall lie on the longitudinal axis of the specimen. Measured deformation and elastic constants are free of d33043 deformation effects; and panels can be bent to large deflections without incurring errors from horizontal force components occurring in other methods. This standard does not purport to address all of the safety concerns, if any, associated with its use.
The depth of the specimen shall be the thickness of the panel. 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. The angular rotation method uses special angular rotation measuring instruments to determine rotational deformation of the portion of the panel subjected to pure bending.
Four methods of tests are included: State clearly the method employed in the report. Reading of the dial gage to the nearest 0. Limitation on size may be imposed by equipment size or moment capacity or size of available material.
The method is frequently used for quality assurance testing of oriented strand board. The length, width and thickness shall be measured within an accuracy of 0.
Specimen size and span above certain minimums are quite flexible. Method C generally is preferred where size of test material permits.