What term describes the ability of a material to deform under load?

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

Answer: (A)

The term that describes the ability of a material to deform under load is ductility. Ductility refers specifically to the capacity of a material to undergo significant plastic deformation before rupture or fracture, meaning that it can be stretched into a wire or shaped without breaking. This property is particularly important in materials that are used in applications where they must withstand tension or bending without failing.

In contrast, malleability refers to the ability of a material to deform under compressive stress, which is often confused with ductility, but focuses on how materials can be shaped (like in metal forming processes) rather than elongated. Toughness refers to how well a material can absorb energy and plastically deform without fracturing, which encompasses both strength and ductility but does not specifically describe the deformation process under load. Elasticity describes the ability of a material to return to its original shape after the load is removed, which does not fit with the concept of permanent deformation.

Thus, ductility is the most accurate term for describing a material's capability to deform when subjected to load, making it the correct choice in this context.