The ability of a material to perform its intended function throughout its designed life without undergoing considerable deterioration is termed as:
Try it first: pick an option, then read the explanation.
Understanding the Concept of Durability
The question describes a material's performance over a long period. This is a crucial concept in engineering, as materials are not just chosen for their initial properties but for their ability to maintain those properties over time in their service environment.
Durability: This is the ability of a material to resist deterioration and decay over its intended service life. It's a measure of how well a material withstands the effects of its environment, such as weathering, chemical attack, corrosion, and wear, without significant loss of function.
Detailed Analysis of Material Properties
Let's distinguish durability from the other fundamental mechanical properties listed.
(a) Durability
Focus: Performance over time and against environmental factors.
Why it's correct: The phrase "throughout its designed life without undergoing considerable deterioration" is the textbook definition of durability. It's about longevity and resistance to long-term decay.
(b) Hardness
Focus: Resistance to surface indentation, scratching, and abrasion.
Why it's incorrect: Hardness is a measure of a material's resistance to localized surface damage. While a hard material might be more durable against wear, hardness itself doesn't describe resistance to chemical attack or weathering over time.
(c) Strength
Focus: Ability to withstand an applied load (stress) without failure or plastic deformation.
Why it's incorrect: Strength describes how a material responds to a force at a single point in time. A material can be very strong initially but not durable if it corrodes quickly (e.g., high-strength steel without protection).
(d) Elasticity
Focus: The ability of a material to deform under load and return to its original shape after the load is removed.
Why it's incorrect: Elasticity is about a material's response to temporary loading and its ability to avoid permanent deformation. It doesn't describe the material's long-term resistance to deterioration.
Study Tips for Material Properties
- Durability = Duration: The easiest way to remember this is to link "Durability" with "Duration." It's the property that relates to how long a material lasts.
- Strength is Instantaneous: Strength is about how much load it can take *right now*.
- Hardness is on the Surface: Hardness is about resisting scratches and dents on the surface.
- Elasticity is a Spring-back: Elasticity is the ability to return to the original shape, like a rubber band.