Intro to Engineering chap 1

Question 1

Why study materials engineering?

Answer 1

Because it allows humans to do things that were previously impossible and the development and advancement of societies is intimately tied to the ability to manipulate materials

Question 2

Stages of materials’ development?

Answer 2

SBI and current - stone age(10,000) , bronze (3,000) age , Iron age (2,000) and 20th and 21st century

Question 3

3 basic materials classifications

(interatomic bonding)

Answer 3

• Metals - metals
• Ceramics - metals and non metals - ionic- covalent
• Polymers - non metallic- covalent and van der walls between molecules

Question 4

Examples of metals?

Answer 4

• Iron, Nickel, Tin

Question 5

Properties of a metal?

Answer 5

• stiff strong pliable
• mid to high melting point
• good thermal and electrical conduction
• corrosion under chemical attack
• 50-400 GPa Young modulus

Question 6

Examples of a ceramic?

Answer 6

Alumina (Al203)
Silica
Cao
ZrO2

Question 7

Properties of a ceramic?

Answer 7

• Stiff hard brittle fracture likelihood
• High melting point
• Insulator of conductivity and thermal
• Good resistance of corrosion
• 50-500GPa Young modulus

Question 8

Examples of a Polymer?

Answer 8

Nylon CHN
Hydrocarbons Polyethene Polystyrene
Polysiloxane - CHS
Rubbers

Question 9

Properties of a polymer?

Answer 9

• Flexible, not strong, stretchable
• low melting point
• Insulates thermal and electric
• Mid corrosion in chemical environment
• 1MPa- 5GPa Young modulus

Question 10

What are the 6 intrinsic properties? MOD-MET

Answer 10

• Mechanical
  
  • Modulus, damping, fracture toughness, tensile strength, fatigue strength
• Optical
• Deteriorative
  
  • oxidation, corrosion, wear
• Magnetic
• Electrical
  
  • conductivity, resistivity, dielectric behaviour, semi conductivity
• Thermal
  
  • conductivity, expansion, stress, specific heat

Question 11

What are the 3 attributive properties?

Answer 11

Economic
- price, availability, recylability

Production
- ease of manufature, joining, finishing

Aesthetic
- colour, texture, feel

Question 12

Other types of classification of materials

Answer 12

Function = MOD MET
Bio materials
Smart materials 
Nanomaterials
Semi conductors

Question 13

Property

Answer 13

Material trait in response to the kind and magnitude of a specific imposed stimuli

Question 14

What are examples of advanced materials?

Answer 14

semiconductors (having electrical conductivities in- termediate between conductors and insulators),
biomaterials (which must be com- patible with body tissues),
smart materials (those that sense and respond to changes in their environments in predetermined manners),
nanomaterials (those that have structural features on the order of a nanometer, some of which may be designed on the atomic/molecular level).