GAUHATI UNIVERSITY

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

Department of Mechanical Engineering

FOURTH SEMESTER

ME 476: MATERIAL SCIENCE I (3–2 – 0)

Time – 3 hrs

Theory – 100 marks

Sessional – 50+25 = 75 marks

1.      The Crystalline Structure: The general crystal lattice, Bravais lattice, the unit cell – cubic and hexagonal lattice. No of atoms in unit cells. Atomic radius and packing factors. Lattice geometry and crystal symmetry. Crystalline planes and directions, Miller indices. Number atoms per square mm of a plane. Solid solution and intermetallic compound. Solodification of metals – Nucleation and grain growth.

2.      Mechanical behaviour: Mechanical properties – determination of tensile and compressive strength, impact strength, fatigue strength, hardness and creep strength. True stress and strain. Non-destructive testing of materials.

3.      Phase diagrams: Gibb’s phase rule. Simple binary phase diagrams and Lever rule. The eutectic, peritectic and peritectoid systems. Iron-Carbon equilibrium diagram and T T T diagram. Principles of heat treatment and geeral heat treatment processes. Hardenability of steel.

4.      Polymers: Definitions and general properties. Mechanisms of polymerizations. Rubber and plastics. Crystalline characteristics of plastics. Molecular weight of polymers.

5.      Thermal properties of materials: Thermal expansion and conductivity, thermal shock resistance and stability, splling, heat resistance. Characteristics of conductors and insulators. Efractories – Simple classifications, properties and uses.

6.      Electronic properties and materials: Electrical conductivity behaviour of conductors, semi-conductors and insulators. Electron energy in metals, the zone theory of solids, zones in conductors, semi-conductors and insulators. Superconductivity, effect of temperature.

Magnetism and magnetisation – diamagnetism, paramagnetism and ferromagnetism. Magnetic energy, dielectric materials.  

Reference Books:

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

2.      The Science of Engg. Materials by N K Srinivasan and S S Ramakrishnan.

3.      A text book of Materials Science by M. Lal.

4.      A text book of Material Science and Metallurgy by O P Khanna.

5.      Material Science and Engineering by V Raghavan.

6.     Materials Science by Van Black, Prentice Hall Int.  

ME 477 SYSTEM DESIGN ( 4-2-0 )

Theory – 100 marks

Sessional – 50

Mini Project – 25

Unit 1: ENGINEERING SYSTEM AND DESIGN

Concept of system, its classification and identification, classical and modern concept, design by evolution and ideation, design history of few engineering products.

Unit 2: NEED ANALYSIS AND DESIGN PROCESS

Need realisation, preliminary need statement, specifications, standards of performance, environmental factors. Structure and development phases of design processes, the morphology of design and drawing.

Unit 3: DECISION ANALYSIS AND METHODS

Research for data – primary and secondary data, forecasting and its types, decision making under uncertainty, pay off matrix, brain storming, synectics.

Unit 4: MODELLING AND SIMULATION

Role of model in design, classification, basic concept of simulation, analog and digital simulation, computer simulation and program.

Unit 5: OPTIMISATION

Need for optimisation, mathematical formulation, linear programming problems ( Only graphical solution).

Unit 6: MATERIAL SELECTION:

Selection process, sources of information regarding performance, properties and cost, economics of materials.

Unit 7: FINANCIAL DESIGN

Categories of cost, fixed and variable cost, break even analysis, sensitivity, design readjustment and manufacturing cost.

Unit 8: RELIABILITY

Uncertainty and risk, reliability theory, reliability of series and parallel systems.

Unit 9: FAILURE ANALYSIS AND QUALITY

Causes of failure, concept of quality, quality parameters and quantification, role of utility and quality in design.

Unit 10: CASE STUDIES

Development of detailed design idea in the form of (a) need statement, (b) need analysis, (c) Morphological analysis and feasibility report.

Belt conveyor, speed gear drive, solar coocker.

Books:

1.      An Introduction to Engg. System Design by V Gupta, P N Murty, Tata-McGrow Hill, New Delhi.

2.     Engineering Design by George Dieter (A processing report), tata-McGrow Hill, New Delhi.  

 ME 478 FLUID MECHANICS – I (3-1-2)

Full marks = 100

Sessional marks = 50

Laboratory = 50

Time = 3 hrs

Introduction: Continuum & flow properties, Concept of fluid and its properties.

Fluid Statics: Pressure at a point, basic equation of fluid statics. Units and scale of Pressure measurement, manometer. Force on plane, curve area. Buoyant forces, Stability of floating and submerged bodies. Metacenter and Metacentric height.

Kinematics of fluid flow: Classification of flow. Stream line, Path line, Streak line circulation & voticity. Continuity equation, velocity function, Stream function, flow net, vortex flow, free and forced vortex.

Dynamics of fluid flow: Euler’s equation of motion, Bernoulli’s equation & its application, General energy equation, Momentum equation for one dimensional flow and steady condition, application of momentum equation.

Flow measurement: Venturimeter, Orifice, Mouth-pieces, Pitot tube, Weirs and Notches.

Dimensional analysis and its application: In simple flow problems, e.g., losses in pipe flow, drag in immersed and partially immersed bodies.

Fluid friction: Reynold’s number, Critical velocity, steady laminar flow tubes, Hagen-Poiscuille’s equation. Flow through annular duct, flow between parallel plates.

Turbulent flow: Causes and characteristics, Shear stress due to turbulence ( Reynold’s stresses), Prandtl’s mixing length theory, Karman’s similarity hypothesis. Velocity distribution, Shear velocity, Universal velicity distribution, Hydraulically smooth and round pipe boundaries, Velocity distribution in rough pipes, Nikuradse’s experiment on artificially roughened pipes, Karman-Prandtl resistance equation, Explicit equations for friction factor.

N.B. : Turbulent flow of FM-II course is shifted to FM-I with the consideration that a full chapter on open channel flow will be introduced in FM – II in sixth semester,BE(mech).

Books:

1.      Fluid Mechanics by Dr. A K Jain, Khanna Publishers.

2.      Fluid Mechanics by Dr. A K Mohanty, PHI Pvt Ltd.

3.     Fluid Mechanics by Streeter and Wylie, McGrow Hill Int.  

 ME 479 MECHANICS OF MATERIALS (3-1-0)

Theory – 100 marks

Sessional – 50 marks

Time – 3 hrs.

1.      Complex stresses and strains:

a) Two-dimensional stress systemss : Stresses on oblique planes due to two direct and shear stresses. Principal stresses, Mohr’s cycle for stresses. Strain on oblique planes, Mohr’s cycle for strain. Strain Rosette.

b) Three-dimensional stress system: Principal stresses, direct and shear stresses on octahedral planes. Mohr’s cycle for tri-axial stress systems. Simple cases.

2.      Stresses due to combined bending and torsion of circular shaft.

3.      Thick cylinder: Lame’s equation, Longitudinal and shear stress, stresses due to shrunk fit.

4.      Stresses in discs of rotation.

5.      Stresses in curved beams: Stresses in crane hooks, rings.

6.      Stresses in circular helical spring.

7.      Deflection of beams: Integration method,Energy methods, Theorem of Castigliano.

Maxwell Bette reciprocal theorem.  

Books:

1.      Elements of strength of materials by Timoshenko

2.      Strength of materials by D S Bedi

3.     Mechanics of materials by J P Denhartog. 

  ME 480 WORKSHOP PRACTICE – III (0-0-3)

Marks (Sessional) – 50

Pattern making shop: Details of tools and equipments, demonstration of various patterns and their scope in foundry works, practice in wood turning lathe, practice with simple pattern, pattern of allowances, core box.

Machine shop:

Lathe work: Taper turning, thread cutting, calculation of change gears, practice in ‘V’threading, square threading and inside threading, Boring, Reaming.

Shaper work: Principles of quick return mechanism and stroke adjustment. Demonstration of simple shaping operation. Practice in slotting, grooving and angle cutting. Comparative study of shaper and planer.

Milling work: Demonstration of different types of milling cutters and fittings thereof. Demonstration of simple milling operations. Setting up of the machine for gea cutting, special milling, simple and differential indexing. Practice in gear cutting.

Foundry shop: Description and demonstration of different types of moulding, preparation of sand for moulding, description and demonstration of different types of cores. Study of the cupola and preparation of molten iron. Practice in casting, Casting defects.

Welding shop: Principles of gas cutting and its demonstration, Practice in gas cuting. Practice in overhead welding, brazing, spot welding.

Sheet metal and smithy shop:

Riveting: Rivet measurements, stages of riveting, single row riveting, single row double strap riveting, chain seam (double row), Zig-zag seam ( double-row staggered ), hollow riveting, mushroom riveting for thin plates, blind riveting for thin plates, riveting faults.

Plate joints: Jointing by paneling, flaring, flanging, bordering, folding, jointing with bent tounges and with twisted tounges.

Adhesive joints: Single overlap, shouldered overlap, double overlap, sploce, splice with single strip, double strip splice, cold setting, hot setting, single component and two component adhesives.