An empirical investigation of impact loading of reconstituted wood plates

Research was conducted to evaluate the response of reconstituted wood plates to impact loading. The research presented examines an empirical approach to characterize impact response for purposes of investigating initial plate failure followed by evaluation of reductions in ultimate load-carrying capacity. Empirically, the impact response problem for a flexible plate requires examining two deformation systems. Analytical solution of the problem was examined using both an approximate static and a more rigorous dynamic analysis. Exact plate theory, which accounts for transverse shear deformation, was used to evaluate impact-induced stresses given the contact force derived from the static or dynamic plate response analysis. Two program codes, Plate Analysis for Static and Dynamic Loading (PASADL1) and PASADL2, were assembled for examining static, dynamic, and impact loading. A selective subroutine (FAIL), structured within the PASADL codes, was designed to predict failure for thin orthotropic plates where the induced-stress field is dominated by deflection stresses. Experimentation was conducted where simply supported plate specimens were impacted according to PASADL FAIL analysis predictions. Three different types of reconstituted wood plates were tested at 16- and 24-inch spans. Initial plate failure was observed for the predicted impact loading cycles. The impacted specimens were statically tested to determine ultimate plate load-carrying capacity. Similarly, control specimens were tested to provide a comparative database for statistical inferences. Small numerical differences were found between average ultimate load-carrying capacities of control and impacted specimens. Greater sensitivity was observed in reductions of plate stiffness.

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