K.S.R. COLLEGE OF ENGINEERING (Autonomous) R 2016 …

K.S.R. COLLEGE OF ENGINEERING (Autonomous) R 2016

SEMESTER - V

12ME3504 DESIGN OF MACHINE ELEMENTS

(Use of PSG Design Data Book permitted)

L T P C

3 1 0 3

Prerequisite: Strength of Materials

Objective(s):

To familiarize various steps involved in the Design Process.

UNIT - I STEADY STRESSES AND VARIABLE STRESSES IN MACHINE MEMBERS [ 09 ]

Introduction to the design process - factors influencing machine design, selection of materials - preferred numbers, fits and tolerances - direct, bending and torsional stress equations - impact and shock loading - principal stresses - 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 - fracture mechanics.

UNIT - II DESIGN OF SHAFTS AND COUPLINGS [ 09 ]

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

UNIT - III DESIGN OF TEMPORARY AND PERMANENT JOINTS [ 09]

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.

UNIT - IV DESIGN OF ENERGY STORING ELEMENTS [ 09 ]

Design of various types of springs, optimization of helical springs - leaf springs - design of flywheels considering stresses

in rims and arms, for engines and punching machines.

UNIT - V DESIGN OF BEARINGS [ 09 ]

Sliding contact and rolling contact bearings - design of hydrodynamic journal bearings, Mckee's equation. Sommerfeld number, selection of rolling contact bearings.

Total =60 Periods

Course Outcomes: 1. Analyze the stress and strain on mechanical components and understand failure modes for their parts 2. Design power transmission shafts carrying various elements with geometrical features. 3. Design and analyze permanent joints under concentric and eccentric loading conditions 4. Design and analyze coil springs under various loads. 5. Design and analyze of machine components such as bearings including prediction of their life and failure.

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.

Reference Books :

1 Khurmi R.S & Guptha J.K, “Machine Design” S.Chand & Co, 2005.

2 Sundararajamoorthy T. V, Shanmugam .N, "Machine Design", Anuradha Publications, Chennai, 2003.

3 Orthwein W, “Machine Component Design”, Jaico Publishing Co, 2003.

4 Ugural A.C, “Mechanical Design - An Integral Approach, McGraw - Hill Book Co, 2004.

5 Robert L. Norton, Machine Design, (4th Edition), Prentice-Hall, 2010

LEGEND: L - Lecture PPT - Power Point

T - Tutorial BB - Black Board OHP - Over Head Projector pp - Pages

TX - Reference Ex - Extra

Sl. No

Lecture Hour Topics to be covered

Teaching Aid

Required

Book No. /Page No

UNIT – I STEADY AND VARIABLE STREESSES

1. L1 Introduction, design process, factors in design, selection of materials

BB T1/PP 1.1- 1.3

2. L2 Preferred numbers,fits and tolerances BB NOTES

3. L3 Direct bending, torsional stresses, impact shock loading

BB T1/PP 1.6-1.8

4. L4 Principal stresses for various load calculations

BB T1/PP 1.9-1.12

5. L5 Eccentric loading,Curved beams, problems BB T1/PP 1.35- 1.38 R2/PP 1.57-1.62

6. L6 Theories of failure, types BB T1/PP 1.43-1.46

7. L7 Problems in theories of failure BB T1/PP 1.64

8. L8 Stress concentration , design for variable loading

BB T1/PP 1.64-1.67

9. L9 Soderberg,goodman relations BB T1/PP 1.74-1.78

UNIT – II DESIGN OF SHAFTS AND COUPLINGS

10. L10 Design of solid BB T1/PP 2.2

11. L11 Design of hollow shafts BB T1/PP 2.3-2.8

12. L12 Design hollow shafts based on strength BB T1/PP 2.80-2.85

13. L13 Rigidity and critical speed BB T1/PP 2.98

14. L14 Design of keys, key ways and splines BB T1/PP 2.98-2.104

15. L15 Design of crankshafts BB T1/PP 2.105 - 108

16. L16 Design of connecting rod BB T1/PP 2.109-2.122

17. L17 Design of rigid couplings BB R2/PP 2.106-2.109

18. L18 Design of flexible Couplings BB R2/PP 2.110-2.111

UNIT – III DESIGN OF TEMPORARY AND PERMANENT JOINTS

19. L19 Threaded fasteners, introduction, design aspects

BB T1/PP 3-3.3

20. L20 design of bolted joints BB T1/PP 3.4-3.7

21. L21 eccentric loading BB T1/PP 3.13

22. L22 Design of knuckle joints, cotter joints BB T1/PP 3.13-3.14

23. L23 Solving problems

24. L24 Welded joints, introduction, and types. BB T1/PP 3.59-3.60

25. L25 Basic weld symbols, strength of welded joints

BB T1/PP 3.63-3.70

26. L26 riveted joints for structures BB T1/PP 3.71-3.78

27. L27 Bonded joints, BB T1/PP 3.112

UNIT – IV DESIGN OF ENERGY STORING ELEMENTS

28. L28 Springs, functions, classification, design aspects

BB T1/PP 4.1

29. L29 optimization of helical springs BB T1/PP 4.2-4.8

30. L30 Design leaf springs BB T1/PP 4.2-4.10

31. L31 Solving simple problems BB T1/PP 4.6-4.10

32. L32 Design of flywheels BB T1/PP 4.7-4.15

33. L33 Design of flywheels considering stresses BB T1/PP 4.18-4.20

34. L34 Design rims and arms BB T1/PP 4.20, 4.74

35. L35 Design for engines and punching machines BB T1/PP 4.109-4.118

36. L36 Design for punching machines BB T1/PP 4.109-4.118

UNIT – V DESIGN OF BEARINGS

37. L37 Design of Sliding contact bearings BB T1/PP 5.1-5.73

38. L38 Design of rolling contact bearings BB R2/PP 5.8-5.15

39. L39 Solving simple problems BB R2/PP 5.16-5.19

40. L40 Design of hydrodynamic journal bearings BB T1/PP 5.11

41. L41 Mckee's equation BB T1/PP 5.11-5.15


43. L43 Sommerfeld number, BB R2/PP 5.65-5.69

44. L44 Selection of rolling contact bearings BB T1/PP 5.29-5.35


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