What is the term for a material's ability to absorb energy when elastically deformed and recover it upon unloading?

• A. Endurance
• B. Toughness
• C. Resilience
• D. Ductility

Answer: (C)

The correct term for a material's ability to absorb energy when elastically deformed and then recover that energy upon unloading is resilience. Resilience is a measure of how well a material can return to its original shape after being subjected to stress within its elastic limit. This property is essential in applications where materials need to withstand repeated loading and unloading cycles without permanent deformation, making resilience a key factor in selecting materials for various engineering applications.

Understanding resilience is particularly important in fields such as mechanical engineering and materials science, where the performance of structures and components under dynamic loading is crucial. It indicates how effective a material is at storing and returning energy, which is beneficial for applications like springs and shock absorbers, where energy recovery is essential for functionality.