Properties Of Structural Materials

Question 1

Name the 4 types of building loads

Answer 1

Weight of actual building
Weight of snow/rain
Wind loads
Weight of occupants and contents

Question 2

What’s the definition of force

Answer 2

That which produces a deformation in a material

Question 3

What’s is strength

Answer 3

The maximum stress before fracture

Question 4

What is stress

Answer 4

The intensity of a force

Question 5

What’s the equation for stress

Answer 5

Force / area

Question 6

Name the 4 types of stress

Answer 6

Shear
Tensile
Compressive
Torsional

Question 7

What’s a the difference between direct and indirect stress

Answer 7

Direct stress acts perpendicular to the plane whereas indirect act parallel

Question 8

If a steel bar is bent into a U shape where is tension, compression and shear stress acting

Answer 8

Shear - in the centre of the beam
Compression - on the top surface
Tension - on the bottom surface

Question 9

What does strain quantify

Answer 9

Deformation

Question 10

How do you calculate strain

Answer 10

Change in dimension / original dimension

Question 11

What is elastic deformation

Answer 11

When the material can return back to its original shape

Question 12

What is elastic deformation

Answer 12

Permanent deformation

Question 13

When a material behaves plastically under tensile stress which property does this material show

Answer 13

Ductility

Question 14

When a material behaves plastically under compressive stress which property does this material show

Answer 14

Malleability

Question 15

What’s toughness

Answer 15

Energy or work required to produce fracture

Question 16

If a material had a low toughness then what other property does the material posses

Answer 16

Brittleness

Question 17

What’s stiffness

Answer 17

Materials resistance to elastic deformation

Question 18

What can you use to measure the stiffness of a material

Answer 18

Young’s modulus

Question 19

How do you work out the Young’s modulus of a material

Answer 19

Stress / strain

Question 20

Name the two types of testing

Answer 20

Destructive

Non destructive

Question 21

What does the area under a force extension graph represent

Answer 21

Toughness

Question 22

How can you tell the difference between ductile and brittle fracture

Answer 22

Ductile produces necking whereas brittle has a clean break

Question 23

When would you calculate proof stress

Answer 23

When the material doesn’t have an obvious yield points

Question 24

What’s they yield point

Answer 24

The change between elastic and plastic deformation

Question 25

What does the gradient of a force extension graph represent

Answer 25

The Young’s modulus (stiffness)

Question 26

The highest point on a force extension graph is?

Answer 26

Ultimate stress

Question 27

What’s the definition of Young’s modulus

Answer 27

Resistance to elastic deformation