power point presentation is related to the material science

1. SAVITRIBAI PHULE
PUNE UNIVERSITY
 DEPARTMENT OF EDUCATION AND EXTENSION
 MHASKE VISHAL BAHIRU
 TYBSC.BED
 SUBJECT:-ELEMENTS OF MATERIAL SCIENCE

2. CLASSIFIACATION OF
METALS
METALS :-
MEATLS IS AN ELEMENT SUBSTANCE
METALS ARE USUALLY GOOD
CONDUCTOR OF HEAT AND
ELECTRICYT AND IT HAS
CHARACTRESS LIKE HARDNESS ,
STRENGTH ,RIGIDITY ,FORMABITY
AND DIMENSIONAL STABILTY

3. SEMICONDUCTORS
 In Semiconductors material t
 he bonding is covalent their electric
properties depend extremely strongly on
minute proportions of contaminats
 They are opaque to visible light, but transpert
to the infrared
 Example: - Si, Ge

4. Ceramics are the material consisting of
phase. A phase is a physically separable and
chemically homogenous constituent of
material.
Atoms behave mostly like either positive or
negative ions, and bounded by coulomb
forceds between them
They are usually combination of material of
metals or semiconducators with oygen,
nitrogen, or carbon (oxides ,nitrides and
carbides)
Example : glass,porcelain , many minerals

5. PROPERTIES OF MATERIAL
MECHANIC
AL
THERMAL
ELECTRICAL
MAGNETIC
CHEMICAL
OPTICAL
PHYSICAL
TECHNOLOGICAL
ACOUSTICAL
PHYSIOCHEMICA
L

6.  Generally mechanical properties are
expressed in terms of function of stress or
strain or both. Stregnth hardness, toughness
elastivity ,Plasticity ,brittleness ,ductility and
mallebality are the mechanical properties
used as measure of how metals behave under
load .
 The mechanichal properties are the poperites
of material that defines its behaviour(strain)
under the external forces or mechanical
usages

7.  Stress:
-The force per unit area on a body that tends to deform
is called stress.
-It is measure of the internal forces in a body between
the paritcles of the material of which it is comprised as
they resist separation,compression or sliding in
response to external force applied
-Mathematically = external force/ cross-section area
-its unit is N/𝑚2 or Pascal, where 1 = 1 newton/ 𝑚2
-there are 3 types of stress
1) Tensile stress
2) compression stress
3) shear stress
Are the axial force per uit area applied to body that tends
either to extend or compress it linearly
It is tangential force per
unit ares that tends to
shear a body

8. Strain
 Strain is measure of the extend to which a body is defom when it is subjected
to a stress. Strain is defomation per unit length under the action the externa
forces
 Strain is the change in length divided by original length
 Mathematically = Change in length/origina length
 It has no unit
Elastic strain:-
It is defomation caused by external applied forced are applied.
It disappear as soon as the applied force are removed

9. 2) Plasticity
3)Hardness
Some
mechanical
properties of
material
7)Toughness
4)Elasticity
5)Ductility
1)strength
8) Stiffness
9)Fatigue
10) Creep
11)Brittleness
6) Malleability