Manufacturing technique and verification for the mechanical fastening section of carbon fiber reinforced anisogrid composite structures

Abstract

Anisogrid structures are composed of relatively thick segments of ribs. Despite this, they do not have a suitable location or part for fastening, and since the fastening sections of most composite structures are the most vulnerable or weak areas, the design and manufacturing of these parts are critical. Abiding by the composite lay-up regulation for the fastening section is desirable to satisfy the bearing strength of the fastening section. In addition, this lay-up process has to be easily applied by being incorporated into the manufacturing process. This study proposes a manufacturing method for a fastening section with no indentations and mechanical fastening that can withstand the bearing strength when fabricating an anisogrid composite using a wet filament winding process. Also, this manufacturing method includes a technique that allows for the selections of the stacking angle ratio and lay-up orientation of the fiber that supports the strength. For verification of the method proposed in this study, the wet filament winding process to fabricate the ribs and the hand lay-up process to manufacture the fastening section were used together. Bearing strength testing was carried out on a fastening section specimen fabricated in this manner to verify the reliability of the proposed technique.