What material is commonly used for stringers and bulkheads?

Stringers and bulkheads are critical structural elements in composite construction, particularly in marine applications. The commonly used material for these components is foam, particularly when constructing lightweight and strong structures.

Foam provides several advantages for stringers and bulkheads. It is lightweight, which contributes to overall vessel performance and efficiency. Additionally, foam's ability to resist water absorption while providing excellent insulation properties makes it particularly suitable for environments such as boats where exposure to moisture is significant. The rigidity and structural integrity of foam when used in sandwich panels—where it is often sandwiched between layers of fiberglass—allow for a strong and durable element that aids in maintaining the shape and structural integrity of the vessel.

While fiberglass is a common material in composite construction, it is often used as a layer over the foam rather than as the primary material for stringers and bulkheads themselves. Steel and aluminum can provide strength and durability but are typically heavier and more prone to issues like corrosion in marine applications, making them less ideal choices for this specific use. Hence, foam stands out as the preferred material for stringers and bulkheads in composite applications.