Which property describes the ability to change its shape under load without cracking and to retain this shape after the load is removed?

Which property describes the ability to change its shape under load without cracking and to retain this shape after the load is removed?

• A. Plasticity
• B. Elasticity
• C. Ductility
• D. Hardness

Answer: (A)

Plasticity is the ability of a material to deform permanently under load and to retain that new shape after the load is removed. When a material yields, its internal structure rearranges so the deformation becomes permanent, and once the external force is gone, it does not snap back to its original form. This distinguishes it from elasticity, where deformation is temporary and reverses on unloading. Ductility describes how much plastic deformation a material can undergo before it fractures, which is related but focuses on the extent of permanent deformation before failure rather than whether the shape is retained after unloading. Hardness concerns resistance to indentation rather than permanent shape change.

Plasticity is the ability of a material to deform permanently under load and to retain that new shape after the load is removed. When a material yields, its internal structure rearranges so the deformation becomes permanent, and once the external force is gone, it does not snap back to its original form. This distinguishes it from elasticity, where deformation is temporary and reverses on unloading. Ductility describes how much plastic deformation a material can undergo before it fractures, which is related but focuses on the extent of permanent deformation before failure rather than whether the shape is retained after unloading. Hardness concerns resistance to indentation rather than permanent shape change.