Significance and Use
These methods determine the compressive strength of structural panels in response to stresses acting in the plane of the panel.
Method A—This method is applicable to structural panels of uniform properties within a panel. It is useful for evaluating plywood of clear, straight-grained veneers, and determining the effect of chemical or preservative treatments, construction, principal direction with respect to direction of stress, and other variables that are expected to uniformly influence the panel.
The compressive properties obtained by this method are a reliable approximation of the strength of a full-size panel, and are intended for use in design.
The compressive properties are influenced by buckling; however, this effect can be eliminated in this test by restraining the edges of the specimens.
It is recommended that where comparisons are to be made, that the same method and specimen size be used throughout. This is because the volume of material included in a test specimen can influence the compressive strength regardless of whether the material properties are uniform throughout the sheet or vary widely due to the presence of growth or manufacturing features.