How are honeycomb sandwich structures designed and manufactured?

Honeycomb sandwich combines thin facesheets with lightweight honeycomb core for high bending stiffness at low weight. Components: Facesheets - Aluminum, CFRP, or fiberglass skins (carry in-plane and bending loads); Core - Honeycomb (aluminum, Nomex, Korex) or foam (provides shear stiffness); and Adhesive - Film adhesive bonds face to core. Design: Facesheet thickness for strength, Core density and height for stiffness, Core-to-facesheet bond critical. Manufacturing: Co-cure (composite facesheets cure with adhesive), Secondary bond (precured facesheets bonded), and Core splicing for complex shapes. Advantages: Excellent bending stiffness-to-weight, Good acoustic damping. Challenges: Moisture ingression (edge closeout critical), Impact damage (thin facesheets), Inspection difficulty (bond quality), and Repair complexity. Applications: Flight control surfaces, Radomes, Fairings, and Interior panels. Core crush during cure requires pressure management. Fillet formation at core-face interface provides bond strength.