Evaluation of testing procedures for stiffness properties of plywood Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mk61rk30k

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  • Elastic properties of plywood panels are essential for predicting structural behavior of wood systems. The ASTM Standard D 3043-76 which evaluates the moduli of elasticity (MOE) of plywood, treats these panels as one dimensional beams instead of two-dimensional plates, which results in an overestimate of the MOE. Improved procedures for plywood testing and evaluation of experimental data are needed. A new procedure was developed, which estimates MOE's of the plywood panel tested as plate from experimentally measured deflections, corresponding external load and panel dimensions. The accuracy of the procedure was compared to that of other methods available; eight plywood panels, tested first as simply supported plate, were gradually cut into smaller specimens and tested by three different methods. Tests showed that MOE's of individual panels, obtained by the developed procedure, were about 20% to 35% smaller than the corresponding MOE's obtained according to the ASTM. The percentages given were not statistically verified, because too small a sample size was used in testing. The main reasons for this difference are the use of beam equation by the ASTM method and the local variation in MOE on plywood panels.
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