What property of a material is defined by its ability to resist abrasions, penetration, and distortion?

• A. Hardness
• B. Brittleness
• C. Malleability
• D. Ductility

Answer: (A)

The property of a material that is defined by its ability to resist abrasions, penetration, and distortion is hardness. Hardness measures how resistant a material is to deformation, often due to indentation or scratching. This property is crucial in applications where materials are subjected to wear and tear, such as in aviation components that might encounter various forms of stress and damage during operation.

When a material exhibits high hardness, it implies that it can withstand significant pressure and abrasive forces without easily being damaged. For instance, hardened steel is often used in parts that require resistance to wear, making it suitable for tools and structural components in aviation.

Other properties listed in the question pertain to different aspects of material behavior. Brittleness refers to a material's tendency to fracture without significant deformation, malleability describes a material's ability to deform under compressive stress (often reshaping without breaking), and ductility refers to the ability of a material to deform under tensile stress (allowing it to be stretched into wire, for example). While these properties are important, they do not directly relate to the material's ability to resist abrasion and penetration, which is why hardness is the most suitable answer.