Materials and their application

Question 1

What are the two principal categories of material properties?

Answer 1

Mechanical and physical

Question 2

What are mechanical properties?

Answer 2

They are associates with how a material reacts to an external force

Question 3

What are physical properties?

Answer 3

They are associated with the actual make-up or structure of the material

Question 4

Compressive strength

Answer 4

The ability to withstand being crushed or shortened by pushing forces

Question 5

Tensile strength

Answer 5

The ability to resist stretching or pulling forces (tensions)

Question 6

Shear strength

Answer 6

The ability to resist sliding forces on a parallel plane

Question 6

Bending strength

Answer 6

The ability to resist forces that may bend the material

Question 7

Torsional strength

Answer 7

The ability to withstand twisting forces

Question 8

Hardness

Answer 8

The ability to resist abrasive wear such as scratching or indentation

Question 9

Toughness

Answer 9

The ability to absorb impact force without a fracture

Question 10

Plasticity

Answer 10

The ability to be permanently deformed and retained the deformed shape

Question 11

Ductility

Answer 11

The ability to be drawn out under tension reducing the cross-section area without cracking it

Question 12

Malleability

Answer 12

The ability to withstand deformation by compression without cracking or breaking. increases with rise of temperature

Question 13

Ferrous metals

Answer 13

A metal containing iron and carbon, they are magnetic and will rust

Question 14

Examples of ferrous metals

Answer 14

Low carbon steel, medium carbon steel and cast iron

Question 15

Non-ferrous metals

Answer 15

A metal not containing metal and it doesn’t rust and isn’t magnetic

Question 16

Examples of non ferrous metals

Answer 16

Aluminium, copper, zinc, gold, titanium and tin

Question 17

Alloy

Answer 17

An alloy is a metal made out of two or more metals or combining two or more metal elements

Question 18

Examples of alloys

Answer 18

Ferrous alloys: Stainless steel, and die steel
Non-ferrous alloys: Bronze, brass duralumin a pewter

Question 19

Hardwoods

Answer 19

A wood from a deciduous tree, which is very slow growing and loses there leaves

Question 20

Examples of hardwoods

Answer 20

Oak, ash, mahogany, teak, birch and beech

Question 21

Softwoods

Answer 21

A wood from an coniferous tree which are fast growing and tend to be evergreen

Question 22

Examples of softwoods

Answer 22

Pine, spruce, douglas fir, cedar, redwood and larch

Question 23

Manufactured board

Answer 23

A man made wood based composite materials

Question 24

Examples of manufactured board

Answer 24

Plywood, chipboard and MDF

Question 25

Thermoplastics

Answer 25

These are materials that be repeatedly reheated and reshaped allowing it to be recycled

Question 26

Examples of thermoplastics

Answer 26

LDPE, HDPE, PP, HIPS, PVC and ABS

Question 27

Thermosetting polymers

Answer 27

A material that when heated undergoes a chemical change. they cannot be reheated or reshaped even under high temperatures.