me2303

LESSON PLAN LP-ME 2303

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Date: 28.06.2010

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Sub Code : ME 2303

Sub Name : Design of Machine Elements

Semester & Branch : V Sem – Mechanical Engg.,

UNIT : I

OBJECTIVE :

To familiarize the various steps involved in the Design Process To understand the principles involved in evaluating the shape and dimensions of a

component to satisfy functional and strength requirements To learn to use standard practices and standard data To learn to use catalogues and standard machine components.

STEADY STRESSES AND VARIABLE STRESSES IN MACHINE MEMBERS :

Introduction to the design Process – factor influencing machine design, selection of materials based on Mechanical properties – Preferred numbers, fits and tolerances - Direct, bending and torsional stress equations – calculation of principle stresses for various load combinations , eccentric loading – Design of curved beams- Crane hook and ‘C’ frame- – Factor of safety – Theories of failure – Stress concentration – design for variable loading – Soderberg , Goodman and Gerber relations Session No

Topics to be covered Time Allocation

Books Referred

Teaching Method

1. Introduction to Mechanical Engineering Design – Phases of design – factors influencing design – examples.

50 min 1,2

2. Selection of Materials – Different materials used in engineering. Applications like CI, Steels, Alloy steels – Mechanical properties – how to select a material for a given application- explaining with examples.

50 min 1,2

3. Heat treatment of steels – different heat treatment processes – selection of processes- depending upon the usage.

50 min 1,2

4Preferred numbers – Types of fits- selection of fits – tolerances on Hole and shaft basis –Finding tolerance values for a given diameter using PSG Design Data book.

50 min DDB

5. Simple stresses in machine members – stresses due to axial, bending, torsional loads – combination of stresses acting on machine members – their effects.

50min 1,2


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Sub Code : ME 2303



UNIT : I

Session No


Books Referred

Teaching Method

6 Eccentric loading – Principle of curved beams - calculation of principle stresses for various load combinations – 2 problems solved

50 min 1,2

7 Design of curved beams – one problem each in crane hook and ‘C’ frame solved

50 min 1,2

8

Factor of safety (FOS) – values for factor of safety – importance of using FOS in design practice – Fatigue strength & endurance limit of materials with the help of S-N diagram - Stress concentration – effects – methods of reducing stress concentration.

50 min 2, DDB

9 Discussing about theories of failure – design based on Maximum shear stress theory – and maximum. principal stress theory .

50 min 2, DDB

10 Problems solved using FOS and theories of failure using design data book.

50 min 2, DDB

11 Design for variable loading – Soderberg & Goodman equations. – for ductile and brittle materials. – discussed

50 min 2, DDB

12 3 problems solved in design for variable loading using the equations.

50 min 2,DDB


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Sub Code : ME 2303



UNIT : II

DESIGN OF SHAFTS AND COUPLINGS

Design of solid and hollow shafts based on strength, rigidity and critical speed – Design of keys and key ways and splines – Design of crankshafts - Design of rigid and flexible couplings.

Session No

Topics to be covered Time AllocationBooks

ReferredTeaching Method

13

Shafts – materials, requirements of power transmission shafts – Design equations for shafts subjected to combined bending and twisting moments – R 20 series -forces acting on the shaft due to belt tensions, Gear reactions – one problem solved.

50 min 1,2, DDB

14 2 problems solved in design of shafts having one pulley and 1 gear, 2 pulleys.

50 min 2,DDB

15 Introduction to keys, keyways – failure of keys due to shearing and crushing – spline keys – applications.

50 min1,2,DDB

16 Types of Couplings – Rigid and flexible couplings – Design procedure for both type couplings using data book discussed.

50 2,DDB

17 1 problem in design of rigid coupling solved. 50 DDB18 1 problem in design of flexible coupling solved 50 DDB19 Introduction to crankshafts – design equations, 50 DDB20 1 problem solved in design of crankshafts

50 DDB

21 CAT – 1 conducted and evaluated 60


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UNIT : III

Unit Syllabus :

DESIGN OF TEMPORARY AND PERMANENT JOINTS :

Threaded fasteners – Design of bolted joints including eccentric loading – Knuckle joints, Cotter joints - Design of welded joints, riveted joints for structures – theory of bonded joints

Session No


Books Referred

Teaching Method

22 Introduction to threaded joints – design of bolts for axial loading & eccentric loading discussed

50 min 2,DDB

23 Designing for bolts based on maximum. Principle stress theory and maximum shear stress theory – equations using DDB

50 min DDB

24 2 problems in design of screwed fasteners solved. 50 min DDB

25Introduction to welded joints – types of loading – eccentric loading – longitudinal and transverse welds discussed

50 min 2,DDB

26 2 problems in design of welded joints for structures solved in the class

50 min 2,DDB

27 Theory of bonded joints – applications 50 min 2,DDB28 Tutorial class conducted on one problem in design of

welded joint given and students will be asked to solve 50 min 2,DDB

29 Design equations for knuckle joints using DDB- One problem solved

50 min DDB

30 Design equations for Cotter joints using DDB – 1 problem solved

50 min DDB


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UNIT : IV

Unit Syllabus :

DESING OF ENERGY STORING ELEMENTS :

Design of various types of springs, optimization of helical springs – rubber springs – Design of flywheels considering stresses in rims and arms, for engines and punching machines.

Session No


Books Referred

Teaching Method

31Introduction to springs, types of springs – helical & leaf – Materials used for springs - applications – design equations for helical and leaf springs discussed.

50 2,DDB

32 Design equations for spring under constant load discussed using data book

2.DDB

33 2 problems in design of helical springs under constant load solved

50 2,DDB

34 Design equations for spring under variable load discussed using data book

DDB

35 2 problems in design of helical springs under variable load solved

50 2, DDB

36Introduction to leaf springs construction with the diagram – stresses acting on the leaf springs - nipping in leaf springs discussed

50 2,DDB

37 Two problems in design of leaf springs solved 50 2,DDB

38Introduction to fly wheels – principle – application coefficient of fluctuation of speed – stresses acting on the rim and arm design equations . –

2, DDB

39 One problem in design of flywheel solved. 50 2, DDB40 One problem in design of flywheel solved. 50 DDB41 CAT- II conducted 60 min


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UNIT : V

Unit syllabus :

DESIGN OF BEARINGS AND MISCELLANEOUS ELEMENTS :

Sliding contact and rolling contact bearings – Design of hydrodynamic journal bearings, Mckee’s Equation, Sommerfield Number, Raimondi & Boyd graphs, – Selection of rolling Contact bearings – Design of Seals and Gaskets – Design of Connecting Rod.

Session No

Topics to be covered Time Books Referred

Teaching Method

42

Introduction to the selection of bearings – types of bearings –comparison of the two types Adv. & disadvantages of rolling contact over sliding contact bearings- application of bearings.

50 min 2, DDB

43

Nomenclature used in bearings –bearing series, Factors influencing the selection of bearings- defining terms C, P, L 10 & Cubic Mean Load discussed.

50 min 2,DDB

44Design equations for ball and roller bearings – 2 problems in selection of ball bearings solved in the class.

50 min 2, DDB

45

Solving 2 problems, one each in Taper roller bearing and spherical roller bearing . 50 min 2,DDB

46Principle of self aligning ball bearings, angular contact ball bearings discussed – 1 problem in each type solved.

50 min 2,DDB

47Introduction to sliding contact bearings- design equations – dimensionless parameters – variables – selection of oil to be used from data book

50 min 2,DDB

48 2 problems in journal bearings Solved in the class using Meckee’s equation

50 min DDB

49

1 problem in journal bearing using performance variables solved in class 50 min DDB


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Note: (Use of P S G Design Data Book is permitted in the University examination)

TEXT BOOKS:

1. Shigley J.E and Mischke C. R., “Mechanical Engineering Design”, Sixth Edition, Tata McGraw-Hill , 2003.2. Bhandari V.B, “Design of Machine Elements”, Second Edition, Tata McGraw-Hill Book Co, 2007.

REFERENCES:

1. Sundararajamoorthy T. V, Shanmugam .N, "Machine Design", Anuradha Publications, Chennai, 2003.2. Orthwein W, “Machine Component Design”, Jaico Publishing Co, 2003.3. Ugural A.C, “Mechanical Design – An Integral Approach, McGraw-Hill Book Co, 2004.4. Spotts M.F., Shoup T.E “Design and Machine Elements” Pearson Education, 2004.

STANDARDS:

1.IS 10260 : Part 1 :1982 Terms, definitions and classification of Plain bearings Part 1 : Construction. 2. IS 10260 : Part 1 : 1982 Terms, definitions and classification of Plain bearings Part 2 : Friction and Wear.3. IS 10260 : Part 1 : 1982 Terms, definitions and classification of Plain bearings Part 3 : Lubrication.

Course Delivery Plan:

Week 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

I II I II I II I II I II I II I II I II I II I II I II I II I II I II I II

Units

Prepared by Approved bySignature

Name Prof. S. RAMESH Dr. N. NallusamyDesignation Professor in Mech. Engg., HOD in Mechanical Engg.,Date 28.06.2010. 28.06.2010.

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