How are stitches handled in the stitched/RFI material?
A-Stitching is modeled in the GENOA composite micro-mechanics module (enhanced ICAN/CEMCAN). A stitch card is used to represent the angle, and type of stitched material. The S/RFI composite is divided into a series of unit cells with both the fiber and stitch segments idealized as linear in the unit cells. A modified PMC3 module computes S/RFI stress limits by adding the oriented contribution of each stitch to each strength (longitudinal or transverse tension, compression or shear) component by tensor transformations in the absolute value.
