1 ) ) Kingdom of Saudi Arabia, Ministry of Higher Education, Jazan University, Preparatory Year...
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1 ) ) Kingdom of Saudi Arabia , Ministry of Higher Education, Jazan University, Preparatory Year Deanship. Practical Production Tech. & Workshop
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Transcript of 1 ) ) Kingdom of Saudi Arabia, Ministry of Higher Education, Jazan University, Preparatory Year...
1 ) )
Kingdom of Saudi Arabia,
Ministry of Higher Education,
Jazan University,
Preparatory Year Deanship.
Practical Production Tech. & Workshop
2 ) )
Practical Production Tech. & Workshop
Assoc. Prof. OSAMA A. HAMED
3 ) )
Tut./Lab
Lec. Topics
6 4 Engineering Materials
3 2 Safety
3 2 Measuring Instruments
3 2 Tools used in Fitting Shop
3 2 Casting
3 2 Joining Methods
3 2 Turning
3 2 Shaping
3 2 Milling
3 2 Drilling
6 4 Metal Forming
3 2 Basics of Cars maintenance
Course syllabus:
4 ) )
CHAPTER ONE
ENGINEERING MATERIALS
5 ) )
INTRODUCTION
Engineering materials are used to manufacture
the products, dictates which manufacturing
process or processes are to be used to provide it
the desired shape.
6 ) )
2. PROPERTIES OF MATERIALS
The various engineering material properties are given as
under.
1. Physical properties
2. Chemical properties
3. Thermal properties
4. Electrical properties
5. Magnetic properties
6. Optical properties, and
7. Mechanical properties
7 ) )
2.1. Mechanical Properties
Mechanical properties describe how a material
responds to an applied force, include strength and
ductility.
Mechanical properties describe how a material
behaves when it is exposed to a sudden, impact,
fatigue, creep or wear.
8 ) )
2.1.1. Strength
Strength is a measure of how the material resists
being misshapen or deformed, when acted under
force.• Tensile strength الشد إجهادThe ability of the material to withstand pulling forces or tension forces.
•Compressive strength الضغط إجهادIt is the ability of the material to withstand squeezing forces or
compression forces.
9 ) )
Fig. 1.1 Schematic universal tensile testing machine Fig. 1.2 Stress strain curve for ductile material
10 ) )
Tensile testing machine
11 ) )
2.1.2. Torsional properties اإللتواء إجهاد It is the ability of a material to withstand twisting
forces.2.1.3. Hardness الصالدة It is the ability of a material to withstand being
scratched.2.1.4. Toughness المتانة A measure of how much energy is required to
break a material. 2.1.5. Stiffness الجساءة It is the ability to resist bending deformation.2.1.6. Ductility المطيلية It is the ability to be elongated.2.1.7. Brittleness القصافة It is the ability to be resist fracture or
deformation.
12 ) )
1.CLASSIFICATION OF ENGINEERING
MATERIALS
A large numbers of engineering materials exists in the
universe such as metals and non metals )leather,
rubber, asbestos, plastic, ceramics, organic polymers,
composites and semiconductor). Some commonly
used engineering materials are broadly classified as
shown in 1.3.
13 ) )
Fig. 1.3 Classification of engineering materials
14 ) )
)a) Ferrous metals are those which have the iron as their main constituent, such as pig iron, cast iron, wrought iron and steels.)b) Non-ferrous metals are those which have a metal other than iron as their main constituent, such as copper, aluminum, brass, bronze, tin, silver zinc, invar etc.
2.2.1. Steels
Steel is an alloy of iron and carbon with carbon content
maximum up to 1.7%. The carbon occurs in the form of iron
carbide, because of its ability to increase the hardness and
strength of the steel.
15 ) )
