How is a bonded honeycomb structure constructed?

A bonded honeycomb structure is constructed by having a solid facing, typically made of composite or metal, bonded to a core material that features a network of open six-sided cells, resembling a honeycomb. This design is intentional as it provides a lightweight yet strong structure with excellent stiffness and strength-to-weight ratios, which are critical in aerospace applications.

The core material often consists of lightweight materials such as aluminum or polymer, allowing it to effectively distribute loads and absorb energy. The facings increase the structure's strength and provide a protective outer layer, ensuring durability against environmental factors and mechanical stress.

In contrast, a solid piece of metal would lack the lightweight characteristics and strength-to-weight efficiency of the honeycomb structure, which is crucial in many applications, particularly in aviation. Multiple layers of plywood glued together would not provide the same structural advantages, as plywood does not have the cellular structure that enables effective load distribution. The option describing just the core material without facings neglects the essential role that facings play in delivering overall structural integrity and performance. Hence, the correct choice highlights the key attributes and design principles of a bonded honeycomb structure.