For what purpose are putties commonly used in composite construction?

Putties play a vital role in composite construction, particularly for filleting bulkheads and stringers. This application involves creating a smooth transition or joint between two surfaces, enhancing the structural integrity and load distribution in these critical areas. Filleting helps to eliminate sharp corners, which can be stress risers, and provides a more uniform distribution of forces. This is especially important in marine applications where the integrity of joints can significantly affect the overall strength and durability of the structure.

While putties can indeed be used for other purposes, such as smoothing surface finishes or bonding materials, the primary and most effective use of putties in the context of composite construction is related to the filleting technique. This ensures that any stresses are adequately managed and helps to maintain the overall strength of composite structures. The misconception surrounding other options is that they may apply to different materials or situations but do not capture the essential purpose of putties in using them as fillets.