The directional properties are then reversed from those described herein. Refer to the above figure for the length and width directions corresponding to the directional results given in the Tables. The concept of equivalent solid material is widely used for design analyses of perforated materials. As applied herein, the equivalent strength of the perforated material is used in place of the strength of the solid material. S. Thus, the designer is able to determine safety margins for the perforated material for any geometry of application and any loading conditions.
Perforated material has different strengths depending on the direction of loading.
The values for the length direction have been calculated conservatively.