Which property allows deformation and return to original shape after load removal?

Which property allows deformation and return to original shape after load removal?

• A. Elasticity
• B. Malleability
• C. Ductility
• D. Toughness

Answer: (A)

Elasticity is the ability of a material to deform under a load and then return to its original shape when the load is removed, as long as the deformation stays within the elastic limit defined by the material’s stiffness (modulus of elasticity). This reversible deformation is what keeps structural components from sustaining permanent changes under normal service loads in aviation. Malleability describes the ability to deform under compressive forces to form a new shape, typically through plastic (permanent) deformation, which is not reversible. Ductility refers to the capacity to undergo significant plastic deformation before fracture, such as drawing into wires, which again involves permanent shape change. Toughness is about how much energy a material can absorb before fracturing, combining strength and ductility, and does not specifically describe reversible deformation.

Elasticity is the ability of a material to deform under a load and then return to its original shape when the load is removed, as long as the deformation stays within the elastic limit defined by the material’s stiffness (modulus of elasticity). This reversible deformation is what keeps structural components from sustaining permanent changes under normal service loads in aviation.

Malleability describes the ability to deform under compressive forces to form a new shape, typically through plastic (permanent) deformation, which is not reversible. Ductility refers to the capacity to undergo significant plastic deformation before fracture, such as drawing into wires, which again involves permanent shape change. Toughness is about how much energy a material can absorb before fracturing, combining strength and ductility, and does not specifically describe reversible deformation.