1. Technological World – CH 12 Manufacturing Technical Objects
Mechanical Properties

2. Mechanical Properties
Mechanical properties of a material describe how it reacts when subjected to one or more constraints
What happens to an object?
We will discuss:
Hardness
Elasticity
Resilience
Ductility
Malleability
Stiffness

3. Hardness Ability to resist indentation or abrasion (scratches)
Examples:
Porcelain tiles
Scratch covers

4. Elasticity
Ability to return to their original shapes after undergoing a constraint
Examples:
Elastic band
Car tires
Basketball

5. Resilience Ability to resist shocks without breaking Examples: Helmet
Car bumpers
Highway barriers

6. Ductility Ability to be stretched without breaking Examples:
Metal being stretched into wires

7. Malleability Ability to be flattened or bent without breaking Examples
Metals bent into shape

8. Stiffness
Ability to retain their shapes when subjected to various constraints
Examples
Bridge floors
Framkeworks

9. Other Properties
Other properties that are useful in construction include
Resistance to corrosion
Resists oxidation (rusting) by water, salts and certain fumes
Electrical conductivity
Is able to carry an electric current
Or is not able = insulator
Thermal conductivity
Is able to transmit heat