Non-destructive Identification of Directions of Orthotrophy of Paper and Paperboard
Keywords:machine made paper, machine made paperboard, machine direction (MD), cross direction (CD), orthotropic model, finite elements, plane stress, plate bending, eigenmodes, time averaged projection moiré, experimental setup, methods of identification.
Two methods on the basis of time averaged projection moiré techniques are proposed for the identification of the
machine and cross directions of paper and paperboard. For industrial applications the method based on the analysis of
the experimental images of the three lowest eigenmodes is proposed. Orthotropic constitutive model is to be taken into
account for machine made paper and single ply paperboard. It is assumed that the paper and paperboard in a printing
device are loaded in their
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