Introduction

Question 1

What are the 4 type of material behaviour?

Answer 1

Elastic, Plastic, Elastoplastic and Viscoelastic

Question 2

What is the ultimate stress?

Answer 2

Maximum stress on the curve (tensile or compressive strength)

Question 3

Ductile Material has:
1. little plastic deformation b4 failure
2. lots of plastic deformation b4 failure
3. Neither

Answer 3

2. lots of plastic deformation b4 failure

Question 4

What is viscosity?

Answer 4

Resistance to flow

Question 5

The deformation of viscoelastic material depends on:

Answer 5

Duration of load, Rate of Temp. & Temp.

Question 6

Low temp = :
1. Brittle
2. Ductile

Answer 6

1. Brittle

Question 7

Work=

Answer 7

Force x Displacement

Question 8

What is the modulus of Resilience?

Answer 8

Energy required to reach yield pts

Question 9

What is toughness?

Answer 9

Energy required to fracture

Question 10

What is yielding?

Answer 10

Strain continues with little or no increase in stress (after elastic limit)

Question 11

What is the difference between yielding and yield point?

Answer 11

Yield point: Transition btwe elastic and plastic behaviour.
Yielding:Strain continues with little or no increase in stress (after elastic limit)

Question 12

What are the 3 sources of material variability?

Answer 12

Material, Sampling and Testing

Question 13

What are the 2 conditions to ensure a proper sampling?

Answer 13

Random and representative sample

Question 14

What is the difference btwe direct and indirect measuring devices?

Answer 14

Direct: Physical & material prop. are usually measured
Indirect: Must be calibrated

Question 15

What is sustainable design?

Answer 15

development