Subject: Engineering of MaterialsClass: Second (Morning)Ministry of Higher Education andScientific ResearchSouthern Technical UniversityTime: An hour and a halfEngineering Technical College/BasrahDate: 6/2/2022Dep. Of Thermal Mechanical Eng.First semester exam (2020-2021)120Q1:A/ Answer the questions for the figure below:1-Re-arrange the curves (A,B and C) from themaximum to minimum according to (Young'smodulus, Tensile Strength and Ductility).2- What does represent the area under curve A?derive the mathematical relation of it.3- How can find the modulus of elasticity of curve C.4- Discuss the effect of temperature on (stiffnessductility, Toughness and point of fracture).5- Determine the true stress at fracture if theengineering fracture strength of 460 MPa, (d. = 12.8mm, d 10.7mm)Q2:A/ chose lor 21- Show that the Atomic packing factor for FCC is 0.74.2- Determine Quantum numbers for each electron when n= 2B/1- Within a cubic unit cell, sketch the following:800200 A10080B-100'C40020002030405Strain(40 mark)i)202ii) (1 1)2- What type(s) of bonding would be expected for each of the following materials: solid xenon,bronze and rubber?CI A cylindrical bar of aluminum 15 mm in diameter is to be deformed elastically in tension. Aforce of 19000 N. produces a reduction in specimen diameter of 3*10 mm if its elastic modulus is100 GPa. Draw the deformation situation and Compute Poisson's ratio for this material?(30 mark)Q3:A/ Calculate the energy for vacancy formation in silver, given that the equilibrium number ofvacancies at (800°C) is (3.6 *102 m).The atomic weight and density (at800°C ) for silver are,respectively, 107.9 g/mol and 9.5 g/cm'.take NA= 6.023*10,K=(1.38 *1023 J/atom-K, or 8.62 *10seV/atom-K)B/What is the type of Imperfections In Solids that relies from applying shear. stress? (also list the1.Other types of this defect)C/Do as required:1-Write the mathematical relation for (i)Shear stress and strain are proportional to each other.(ii) Brinall Hardness number.2-Write in short about Biomaterials?(30 mark)"Good Luck"eDr. Raed Sabri HameedIman.A.MashkoorExaminerHead of Department1/1 laial i

120 Ql:A/ Answer the questions for the figure below: 1-Re-arrange the curves (A,B and C) from the maximum to minimum according to (Young's modulus, Tensile Strength and Ductility). 2- What does represent the area under curve A? derive the mathematical relation of it. 200 A 100 80 60 -100'C 400 3- How can find the modulus of elasticity of curve C. 4- Discuss the effect of temperature on (stiffness ductility, Toughness and point of fracture). 5- Determine the true stress at fracture if the engineering fracture strength of 460 MPa, (d.= 12.8 mm, de 10.7mm) 40 25 C 20 01 02 03 04 05 Strain (40 mark) Stiess (MPa

120 Ql:A/ Answer the questions for the figure below: 1-Re-arrange the curves (A,B and C) from the maximum to minimum according to (Young's modulus, Tensile Strength and Ductility). 2- What does represent the area under curve A? derive the mathematical relation of it. 200 A 100 80 60 -100'C 400 3- How can find the modulus of elasticity of curve C. 4- Discuss the effect of temperature on (stiffness ductility, Toughness and point of fracture). 5- Determine the true stress at fracture if the engineering fracture strength of 460 MPa, (d.= 12.8 mm, de 10.7mm) 40 25 C 20 01 02 03 04 05 Strain (40 mark) Stiess (MPa

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Chapter1: Introduction

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Question

Subject: Engineering of Materials
Class: Second (Morning)
Ministry of Higher Education and
Scientific Research
Southern Technical University
Time: An hour and a half
Engineering Technical College/Basrah
Date: 6/2/2022
Dep. Of Thermal Mechanical Eng.
First semester exam (2020-2021)
120
Q1:A/ Answer the questions for the figure below:
1-Re-arrange the curves (A,B and C) from the
maximum to minimum according to (Young's
modulus, Tensile Strength and Ductility).
2- What does represent the area under curve A?
derive the mathematical relation of it.
3- How can find the modulus of elasticity of curve C.
4- Discuss the effect of temperature on (stiffness
ductility, Toughness and point of fracture).
5- Determine the true stress at fracture if the
engineering fracture strength of 460 MPa, (d. = 12.8
mm, d 10.7mm)
Q2:A/ chose lor 2
1- Show that the Atomic packing factor for FCC is 0.74.
2- Determine Quantum numbers for each electron when n= 2
B/1- Within a cubic unit cell, sketch the following:
800
200 A
100
80
B
-100'C
400
200
02
03
04
05
Strain
(40 mark)
i)202
ii) (1 1)
2- What type(s) of bonding would be expected for each of the following materials: solid xenon,
bronze and rubber?
CI A cylindrical bar of aluminum 15 mm in diameter is to be deformed elastically in tension. A
force of 19000 N. produces a reduction in specimen diameter of 3*10 mm if its elastic modulus is
100 GPa. Draw the deformation situation and Compute Poisson's ratio for this material?(30 mark)
Q3:A/ Calculate the energy for vacancy formation in silver, given that the equilibrium number of
vacancies at (800°C) is (3.6 *102 m).The atomic weight and density (at800°C ) for silver are,
respectively, 107.9 g/mol and 9.5 g/cm'.take NA= 6.023*10,K=(1.38 *1023 J/atom-K, or 8.62 *10s
eV/atom-K)
B/What is the type of Imperfections In Solids that relies from applying shear. stress? (also list the
1.
Other types of this defect)
C/Do as required:
1-Write the mathematical relation for (i)Shear stress and strain are proportional to each other.
(ii) Brinall Hardness number.
2-Write in short about Biomaterials?
(30 mark)
"Good Luck"
e
Dr. Raed Sabri Hameed
Iman.A.Mashkoor
Examiner
Head of Department
1/1 laial i

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