L2 overview of materials

1. OML751 TESTING OF MATERIALS
OML751 TESTING OF MATERIALS
M.KARTHIKEYAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI
karthikeyan@aaacet.ac.in

2. UNIT I INTRODUCTION TO MATERIALS TESTING
1. Overview of materials
2. Classification of material testing
3. Purpose of testing
4. Selection of material
5. Development of testing
6. Testing organizations and its committee
7. Testing standards
8. Result Analysis
9. Advantages of testing.

3. MATERIALS
 Materials are made up of matter.
 Matter maybe in the form of solid, liquid and gas.
ENGINEERING MATERIALS
 Materials that are used as raw material for any engineering
application are known as Engineering Materials.
OVERVIEW OF MATERIALS

4. METALS
 Good conductor of heat and electricity.
 Example: copper
NON - METALS
 Poor conductor of heat and electricity.
 Example: plastics

5. FERROUS
 With iron
 Example: Steel & cast iron
NON FERROUS
 Without iron
 Example: Aluminium & Titanium

6. THERMOPLASTICS
 Can be reused
 Example: Polyethylene terephthalate [PET]
THERMOSETS
 Cannot be reused
 Example: Epoxy [EP]

7. CERAMICS
 Withstand high temperature
Example:
1. Aluminium oxide Al2O3
2. Silicon carbide SiC

8. ALLOYS
 Mixture of two or more elements
 Major portion – solvent
 Minor portion - solute
 Atleast one metal
 Homogeneous mixture
 Isotropy in nature
 Identical property at all the points
COMPOSITES
 Mixture of two or more elements
 Major portion – matrix
 Minor portion - reinforcement
 Not necessary
 Heterogeneous mixture
 Anisotropy in nature
 Property will differ based on the loading conditions
 Tailoring the property

9. ENGINEERING
MATERIALS
METALS &
ALLOYS
FERROU
S
STEEL
LCS
MCS
HCS
SS
HSS
CAST
IRON
GCI
WCI
MCI
DCI
NON
FERROU
S
COPPER
ALUMINIUM
TITANIUM
MAGNESIU
M
NICKEL
PLASTICS
THERMOPL
ASTICS
PET
PVC
THERM
OSETS
EP
PU
CERAMICS
Al2O3
SiC
WC
Si3N4
PSZ
COMPOSITE
S
PMC
MMC
CMC
CCC

10.  LCS – Low Carbon Steel
 MCS – Medium Carbon Steel
 HCS – High Carbon Steel
 SS – Stainless Steel
 HSS – High Speed Steel
 GCI – Gray Cast Iron
 WCI – White Cast Iron
 MCI – Malleable Cast Iron
 DCI – Ductile Cast Iron
 PET - Polyethylene terephthalate
 PVC - Polyvinyl chloride
 EP - Epoxy
 PU- Polyurethane

11.  Aluminium oxide Al2O3
 Silicon carbide SiC
 Tungsten carbide WC
 Silicon nitride Si3N4
 Partially stablized Zirconia PSZ
 PMC – Polymer Matrix Composites
 MMC – Metal Matrix Composites
 CMC – Ceramic Matrix Composites
 CCC – Carbon Carbon Composites

12. METALS & ALLOYS
PROPERTIES
1. Good tensile property
2. Good machinability
3. Good malleable property
4. Greater toughness
5. Ability to withstand moderate temperature
APPLICATIONS
1. Constructions
2. Buses
3. Surgical instruments
4. Door handles
5. Railway track

13. PLASTICS
PROPERTIES
1. Good chemical resistance
2. Easily colored
3. Dimensionally stable
4. Very low moisture absorption
5. non biodegradable
APPLICATIONS
1. Plumbing systems
2. Helmets
3. Electrical connectors
4. Automobile components
5. Containers

14. CERAMICS
PROPERTIES
1. Extreme hardness
2. High wear resistance
3. Corrosion resistance
4. Low ductility
5. Very brittle
APPLICATIONS
1. Cutting tool material.
2. Gas turbine parts
3. Hot extrusion dies
4. Rocket engine parts
5. used as an insulator

15. COMPOSITES
PROPERTIES
1. Light weight
2. High strength to weight ratio
3. Excellent wear resistance
4. Good toughness
5. Combination of both tensile and compressive property
APPLICATIONS
1. Space shuttle
2. Medical implants
3. Satellites
4. Storage containers
5. Automobile components

16. PART - A
 What is meant by engineering materials?
 Difference between alloys and composite
 Difference between thermoplastics and thermosetting plastics
 Give some examples for non ferrous metals and plastics
PART - B
 Categorize the various types of engineering materials with the
help of tree diagram
QUESTIONS