What is a common sign of delamination in composite materials?

A common sign of delamination in composite materials is the separation of layers within the composite structure. Delamination occurs when the bond between layers of the composite breaks down, allowing the layers to separate. This can impair the structural integrity of the material, leading to potential failures if not addressed. Recognizing this sign is critical for maintenance and safety, especially in aviation applications where strength and reliability are paramount.

While increased weight, changes in color or sheen, and the presence of bubbles on the surface can indicate issues with composite materials, they are not definitive signs of delamination itself. Increased weight might suggest moisture absorption or other material degradation, changes in color could result from environmental exposure or aging, and bubbles generally signify processing defects or trapped air during manufacturing. However, these factors do not specifically point to the layer separation characteristic of delamination.