OUT-OF-PLANE SHEAR DEFORMATION-BEHAVIOR OF PAPER AND BOARD

A new procedure for the mechanical determination of out-of-plane shear stress-strain behavior employing the torsion mode is being developed. Measurements have been made on commercial linerboard and corrugating medium samples. In-plane and out-of-plane elastic properties were measured ultrasonically, and where appropriate, comparisons have been made with those determined mechanically. These properties were also measured in the thickness direction, where material had been removed by surface grinding. The effects of shear straining up to failure on the compressive strength of corrugating medium were also studied.