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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However, it may be used to determine the effects of finger joints, veneer joints and gaps, and other features which can be placed dd3043 between the load points and whose effects can be projected readily to full panel width.
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, a minimum specimen width of 24 in. It is preferred when equipment is available. Historical Version s – view previous versions of standard. Resulting deflection at mid span is measured. There are many sizes available and they are usually specified by the customer.
Four methods of tests are included:. By means of our testing expertise and modular product design, we will help find the solution that is right for you. The choice of method will be dictated by the purpose of the test, type of material, and equipment availability. Moments applied to fail specimens tested by Method A, B or D in which large deflections occur can be considerably larger than d30043.
Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers.
Also like Method A, this method uses small specimens in a center-point simple span test configuration. All three points shall lie on the longitudinal axis of the specimen. NOTE 3—Establishment of a span-depth ratio is required to allow an accurate comparison of test values for materials of different thicknesses.
Four methods of tests are included: All methods are applicable to material that is relative uniform in strength and stiffness properties. If individual gage readings are taken, at least 12 and preferably 15 or more load and deflection readings shall be taken below approximate proportional limit or for determining specimen stiffness.
Aztm Documents purchase separately The asm listed below are referenced within the subject standard but are not provided as part of the standard. Modulus of Rupture can also be determined however it is subject to a notable degree of error based on the bottom span, loading points, and the total astk at failure. Based on Eq 12, the loading rate is: 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.
Give our test engineers a call today for help configuring the best test machine and accessories according to your standard.
Suitable equipment of the transducer type is illustrated in Fig. These errors are not present in Method C. When rounded supports are used, the radius shall be at least 1. Total deflection, and modulus of elasticity computed from it, include a relatively constant component attributable to shear deformation.
We offer machines, apparatus, testers, tensile grips, test fixtures, clamps, holders, aastm, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and aetm solutions for unique applications. Measurements shall be to the nearest 0. 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.
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.
ASTM D covers several procedures for testing wstm flexural properties of structural panels.
To eliminate plate action when wider specimens are tested, the specimen width shall not exceed one third of the span length and precaution shall be taken to ensure uniform bearing across the entire width of the specimen at the load and reaction points. Four methods of tests are included:. 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.
Limitation on size may be imposed by equipment size asgm moment capacity or size of available material. This test method covers the flexural properties of strength and stiffness.
ASTM D – Structural Panel Flex Test
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. The depth of the specimen shall be equal to the thickness of material, and the width shall be 1 in.
When deflection is measured relative to two points on the neutral axis of the panel: However, it is important that the distance between load point and adjacent support be sufficient to prevent rolling shear failures.
Comparisons of results of plywood, veneer composites, and laminates astn solid wood or other plywood constructions will be greatly assisted if the thickness of the individual plies is measured to permit computation of section properties. EI 5 MR 8 where: Four methods of tests are included: Significant errors in modulus of rupture can occur when nominal moment is used see Appendix X1. 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.
Method C generally is preferred where size of test material permits. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Support axes of the loading frames to remain in a parallel relationship throughout the test Note 4. Specimen size and span above certain minimums are quite flexible. Method C generally is preferred where size of test material permits.
Moisture content specimens also serving as asmt gravity specimens shall be free of density variations and inner ply voids such as knotholes or edge gaps between veneers. Calculate the rate of motion of the movable head as follows: An electronic transducer could be substituted for the dial gage for direct recording if system accuracy is adequate.
ASTM D3043 Flexural Structural Panel Testing Machine
NOTE 6—In cutting the specimen to meet the length requirement, it is not intended that the length be changed for small d3403 in thickness. This equipment is the subject of U. It is preferred when equipment is available.