GAUHATI UNIVERSITY

SYLLABUS FOR FOURTH YEAR B. E. COURSE (1996 REVISION)

Department of Mechanical Engineering

SIXTH SEMESTER

ME 676 MATERIALS SCIENCE – II (3-1-2)

Theory – 100 marks

Sessional – 50 marks

Lab – 50 marks

CHAPTER I: Deformation of materials: Plastic deformation by slip and twinning of single crystals – Mechanisms, Slip planes, slip directions, Burger vector and Miller indices – Twinning planes and boundary – Deformation of polycrystalline materials.

Recovery, Recrystallisation and grain growth, Work hardening, Elastic aftereffect, Bauchinger’s effect, Preferred orientation and Season-cracking.

Fracture – Brittle and Ductile, Griffith’s theory.

CHAPTER II: Bonds in solids: Introduction and concept – mechanism – Primary and secondary bonds.

CHAPTER III: Heat treatment: Heat treatment of C I, M S, Stainless steel, H S S, Cu and Al- alloys.

Case hardening and surface hardening – Pracipitation hardening. Diffusion hardening and martensing.

CHAPTER IV: Diffusion in solids: Concept – Diffusion types – mechanisms and laws of diffusion. Variables effecting diffusion. Applications of diffusion.

CHAPTER V: Oxidation: Oxide types – Mechanisms of film growth and the rate of growth – protective oxides. Selective oxidation – beneficial and adverse effects – Oxidation control.

CHAPTER VI: Aqueous corrosion: Factors influencing corrosion – Basic mechanisms. Types – Electrochemical and Galvanic corrosion; Passivation and polarisation; Liquid metal corrosion, rusting of iron.

Specific forms – pitting, intergranular attack, high temperature corrosion, Erosion corrosion, Brass corrosion, Caustic embrittlement. Corrosion control.

CHAPTER VII: Engineering alloys: Composition, properties and applications of tool and die steels, Spring steels, heat and scale resistant steels. Babbits and their types. Cu-based, Al-based and Ni-based alloys.  

Books:

1.      Materials Science by A K Gupta and R C Gupta.

2.      The Science of Engineering Materials by N K Srinivasam and S S Ramakrishnan.

3.      A text book of materials science and metallurgy by O P Khanna

4.      Physical Engg. Metallurgy by Lakhtin.

5.      Material science and Engg. By V Raghavan

6.     Material Science by Van Black.  

ME – 677 MACHINE DESIGN – II (3-3-0)

Theory – 100 marks

Sessional – 100 marks

Design against static load:

Different types of load and stresses, Mode of failure, Factor of safety, Theories of failure.

Design against fluctuating load:

Stress concentration, Fluctuating stresses, Fatigue failure, Endurance limit, Notch sensitivity, Cumulative damage in fatigue, Soderberg and Goodman diagrams, Fatigue design under combined stresses.

Design considerations and simple cases of design of

a.      Mechanical spring – helical spring

b.      Friction clutches – Single and multi-disc clutch, cone clutch.

c.       Brakes – Disc, cone, Band and Internal expanding shoes

d.      Spur gear

e.      Bearing – Radial and thrust journal bearings; Antifriction bearings

f.        Cams

g.     Gasket for static loads, in vessel opening.  

Books:

1. Machine design by Blach & Adams, Tata McGrow Hills

2. Design of machine elements by M F Spott

3. Design of machine elements by B V Bhandari, Tata McGrow hills

4. Machine design by Hall

5. Machine design by Khurmi & Gupta

6. Machine design by Bahl 7 Goel

7. Machine design by Shingley.

ME 678 WORKSHOP THEORY – II (3-1-2)

Time: 3 hrs

Theory: 100 marks

Sessional: 50 marks

Lab.: 50 marks

Chapter 1: Mechanics of metal cutting:

1.      Mechanism of chip formation, type of chips, 2) Orthogonal and Oblique cutting, 3) Chip thichness and reduction ratio’s velocity relationships, 4) Cutting forces in orthogonal machining, 5) Merchont’s theory of machine cutting, 6) Measurements of cutting forces and power, 7) Cutting variables and factors affecting them, 8) Tool life and tool wear – Types of tool wear, factors affecting tool life, 9) Machinability and factors affecting it, 10) Cutting fluids.

Chapter II: Semiautomatics:

1) Capstan and turret lathes and their differences

2.      Different parts of Capstan turret lathes

3.      Mechanism of turret indexing and bar feeding

4.      Work-holding and tool-holding devices and tools

5.      Turret tooling layout and preparation of tooling schedule charts.

Chapter 3: Drilling, Reaming and Boring:

1.      Definition of drilling, spindle drive mechanism, tool and work-holding devices, drilling machine operations, types of drills and twist drill nomenclature, drill size and designation of drills, machining time, deep hole drilling and ‘M’ trepanning

2.      Introduction to the process of reaming and tapping

3.      Introduction to the process of boring, tools and machines used in Jig boring.

Chapter 4: Milling

1.      Definition of milling

2.      Milling machine parts, cutter holding devices

3.      Milling cutter types and elements of plain milling cutter

4.      Milling machine operations, up and down milling, End milling and helical milling

5.      Machining time

6.      Dividing head and indexing

Chapter 5: Grinding

1.      Definition, types of grinding processes and machines

2.      Grinding wheel construction

3.      Selection of grinding wheels

4.      Dressing, trimming and balancing methods, advantages and limitations

5.      Tool and cutter grinding

Chapter 6: Broaching

1.      Introduction to broaching, 2) Pull and push broaching, 3) Advantages and limitations

Chapter 7: Non-conventional machining:

1) Introduction to the processes, principle of operations, Applications and merits of a) Electrodischarge Machining (EDM ), b) Electrochemical machining (ECM), c) Laser beam Machining (LBM), d) Ultrasonic Machining (USM), e) Abrasive Jet Machining (AJM), f) Plasma Arch Machining (PAM).

Chapter 8: Advanced Welding Processes:

1. Introduction to the principles of operations of Tugster Inert Gas (TIG) and Metal Inert Gas (MIG), Welding processes, Electron beam welding (EBW), Laser Beam Welding (LBW), Thermit Welding, Atomic Hydrogen Arc Welding

2. Types of welding joints

3. Testing of joints.

Books:

1. Workshop Technology – by W A Chapman

2. Workshop Technology – by S K Hazra Choudhury

3. Production Technology – by H M T  

ME 679 MECHANISMS AND DYNAMICS OF MACHINES

Theory – 100 marks

Sessional – 50 marks

Lab. – 50 marks

Time – 3 hrs

Chapter – I: Kinematic analysis of plane motion:

Velocity diagram, Acceleration diagram, Coriolis component of acceleration, Analytical method of kinematic analysis.

Chapter – II: Kinematic synthesis of linkages:

Introduction, number synthesis, basic features, analytical methods, graphical methods.

Chapter – III: Mechanisms:

Mechanism, Mobility, Inversion, Test for 4 bar mechanism by Grashoff’s law, Straight line mechanism, Oscillatory mechanism, Quick return mechanism, Steering mechanism, Spatial mechanism – Hook’s joints.

Chapter IV: Governor mechanisms:

Spring controlled centrifugal governor – Hartnell, Hartung. Inertia governors, Stability, Effects of friction, Isochronism, Hunting capacity, effort and power.

Chapter V: Gyroscopic action in machines:

Gyroscopic action and force, method of analysis, Gyroscopic action in certain machine elements, use of gyroscopic principles in instruments.

Chapter VI: Balancing of enertic forces & moments in machines:

Balancing of rotating masses, two plane balancing, balancing of recipricating masses, balancing of single cylinder and multi-cylinder engines, Firing order, Balancing of rotors, Field balancing, Balancing instruments.

Books:

1.      Theory of machines by T Bevon

2. Theory of machines & mechanisms by Singley Gowicker

3. Theory of mechanism and machines by Ghosh & Mallick, Tata McGrow Hills

4. Theory of machines by J Lal.

ME 680 HEAT TRANSFER – I (3-1-2)

Theory - 100

Sessional – 100

1.      INTRODUCTION & CONCEPTS

a) Conduction

b) Convection

c) Radiation

d) Combined heat transfer mechanism

2.      CONDUCTION HEAT TRANSFER

e) General 3-D differential equation for heat conduction in Cartesian, Cylindrical and Spherical Co-Ordinate system; and their reduction to one-dimentional form.

f) Boundary conditions and their types.

3.      ONE DIMENTIONAL STEADY STATE HEAT CONDUCTION

g) System with or without heat generation:

i) The slab (Plane wall)

ii) The cylinder

iii) The sphere

h) Concept of thermal resistance and electrical analogy

i) Variable thermal resistance and electrical analogy

j) Composite systems:

The slab ( Plane wall)

ii) Co-axial cylinders

iii) Concetric spheres

k) Critical radius of insulation

l) Extended surfaces

a.      One – dimentional fins; Equation for fins of uniform cross-section; rectangular/ circular fins

ii) Long fins

iii) Fins with insulated end

iv) Fins with convection at the end

iv) Fin efficiency and effectiveness

4.      ONE DIMENTIONAL UNSTEADY STATE HEAT CONDUCTION

m) Lumped system analysis

n) Response time of a temperature measuring instrument

o) Mixed boundary condition

p) Use of Transient – Temperature starts ( Heister charts) to solve unsteady heat transfer from slabs and cylinders.

5.      RADIATION HEAT TRANSFER

q) Basic relations :

a.      Nature of thermal radiation, emmissive power

ii) Absorption, Reflection and Transmission

iii) Concept of a black body

iv) Intensity of radiation

v) Laws of black body radiation

vi) Radiation from non-black surfaces; Emmissivity

vii) Radiation to and from real surfaces

r) Radiative heat exchange between surfaces:

i) Radiation between two black bodies

ii) Radiation shape factor ( View factor ) and its properties.

iii) Shape factors for different geometries.

iv) Radiation between two infinite parallel places

v) Radiation between two infinitely long concentric cylinders

vi) Radiation between grey bodies

vii) Electric network analogy for thermal radiation

viii) Radiation shields

ix) Radiation combined with convection

6.      DIFFUSION MASS TRANSFER:

s) Concentrations, Velocities and Fluxes

t) Fick’s law of diffusion, the diffusion co-efficient

u) Species conservation equation and the boundary equation

v) Steady state molecular diffusion

a.      Diffusion through stationary media

ii) Equimotor counter diffusion

iii) Diffusion through a stagnant gas film.

Books:

1. Heat transfer, a basic approach by M N Ožišik , McGow Hills.

2. Heat and Mass Transfer by R C Sachdeva, Wiley Eastern.