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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Resulting deflection at mid span is measured.
Variables Influencing Flexure 9. 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 varies with mid-span deflection. The supports shall be rounded or shall be knife edges provided with rollers and plates under the specimen at these points. The width shall be at least 3 in. An approximate correction can be made. Support axes of the loading frames to remain in a parallel relationship throughout the test Note 4.
ASTM D 3043 – 00 Structural Panels in Flexure
The axes of these surfaces shall remain parallel and at least one of them shall be free to turn about its axis or be loaded through rollers to prevent the application of friction forces to the surface of the specimen. 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.
Please copy and paste this embed script to where you want to embed Embed Script. It is preferred when equipment is available. The test is simple and flexible, and results are directly relatable to basic properties at large deformations.
Construction of a suitable end support using small roller bearings in conjunction with a plate xstm clips to the end of the specimen is illustrated in Fig. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM D – 00() Standard Test Methods for Structural Panels in Flexure
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 qstm. Significant errors in modulus of rupture can occur when nominal moment is used see Appendix X1. Comparisons of results of plywood, veneer composites, and laminates with 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.
It should be noted 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. If individual gage readings are taken, at least 12 and preferably 15 or more load and deflection readings shall be taken below approximate proportional asym or for determining specimen stiffness.
Only Method C should be used d3034 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. A reference rod approximately the same length as the spacing between pins is e3043 at each end with an angular sensing device. Width shall be 1 in.
ASTM D – 00 Structural Panels in Flexure – Free Download PDF
These errors are not present in Method C. Method C generally is preferred where size of test material permits. Conditioning of test material at controlled atmospheres to control test moisture content and determination of specific gravity are recommended. When deflection is measured relative to two points on the neutral axis of the panel: This method is particularly recommended for thin specimens and small loads.
Force range of 5 kN to kN 1, lbf tolbf Adjustable test space The most popular choice for static tension and compression tests These dual column testers are available in both tabletop and floor standing models. Link to Active This link will always route to the current Active version of the standard. Originally published as D — The principle of a commercially available flexure testing machine complying with these requirements is diagrammed in the figure below.
ASTM D3043 Flexural Structural Panel Testing Machine
D load points plus 48 times specimen thickness or 24 times specimen thickness for the principal direction parallel or perpendicular respectively.
It is preferred asttm equipment is available.
The width of the loading block shall exceed the width of test specimens. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of asm of such rights, are entirely their own responsibility.
By means of our testing expertise and modular product design, we will help find the aztm that is right for you. Limitation on size may be imposed by equipment size or moment capacity or size of available material. Structural panels in use include plywood, waferboard, oriented strand board, and composites of veneer and of wood-based layers.
Based on Eq 12, the loading rate is: Bearing points shall be rounded where they contact the specimen.