DESIGN OF MACHINE ELEMENTS

GUJARAT TECHNOLOGICAL UNIVERSITY

MECHANICAL ENGINEERING (19)

DESIGN OF MACHINE ELEMENTS

SUBJECT CODE:- 2151907

B.E 5th SEMESTER

  1. Introduction:- Design procedure, Selection of preferred sizes, Aesthetic and Ergonomic considerations in Design, Manufacturing considerations in Design, Mechanical Properties of Materials, Effect of Alloying elements and heat treatment on properties of steel, Materials Selection in Machine Design,  IS coding of steels and cast irons.
  2. Design Against Fluctuating Loads:- Stress Concentration, Endurance limit and Fatigue failure, Factors affecting endurance limit, S-N Diagram, Design for reversed stresses and cumulative damage, Fluctuating stresses; Soderberg Gerber, Goodman and Modified- Goodman criteria, Combined Stresses.
  3. Design of Springs:- Classification of springs, Helical Spring; Style of ends, Stresses, Correction Factors, and Deflection, Design against static and fluctuating loads, Concentric springs, surge phenomenon, Helical Torsion and Spiral Springs, Belleville spring, shot peening of springs. Multi-Leaf Spring; Terminology, Nipping, and Design of Multi-leaf spring.
  4. Belt and Chain Drives:-                                                                                                                                                                                    Flat Belt Drive:- Belt Construction, Flat Belt Drive; Length of belt : Open and Cross drive types, Ratio of Tensions on tight side to slack side, Condition for maximum power transmission, Creep phenomenon, Methods for tensioning, Selection  of belts from catalogues, Design of pully for flat belt drive, Timming belt selection. V-Belt Drive, Nomenclature, Selection of V- Belts from catalogues.                                                                                                                                                                                  Chain Drives:- Nomenclature of roller chains, Lengths and power rating of chains, Design of chain drive.
  5. Pressure Vessels:- Thin cylinders and spherical vessels, wire wound cylinders, Thick cylinders: Principal stresses in cylinder subjected to internal/external pressure, Lame’s equation, Clavarion’s and Bernie’s equations, Autofrettage, Compounding of cylinders, Gasketed Joints, Thickness of cylindrical and spherical shells, Design of End closures, Area compensations of nozzles, Introduction to Design codes.

Introduction: Design Consideration

1
Introduction to Machine Design
2
Design Procedure (Design Process)
3
Design Considerations
4
Aesthetic Consideration in Design
5
Ergonomic Consideration in Design
6
Areas Covered Under Ergonomics
7
Practical Example of Ergonomics in Design
8
Manufacturing Consideration in Design (Design for Manufacturing)
9
Design Consideration for Castings
10
Design Consideration for Forgings
11
Design Consideration in Machining (Design For Machining)
12
Design Consideration in Welding (Design For Welding)
13
Assembly Consideration In Design
14
standardization
15
Preferred Series and Its Selection
16
List of Formulae

Introduction : Engineering Materials

1
Factors Influencing Selection of Material
2
Mechanical Properties of Materials
3
Classification of Engineering Materials
4
Cast Iron
5
Plain Carbon Steels
6
Alloy Steels
7
High Alloy Steels
8
Cast Steels
9
Heat Treatment of Steels
10
Material Selection Process

Design Against Fluctuating Loads

1
Stress Concentration
2
Stress Concentration Factors
3
Fatigue Load and Fatigue Failure
4
Fluctuating Stresses
5
Endurance Strength, Endurance Limit and S-N Diagram
6
Relation Between Endurance Limit and Ultimate Tensile Strength of Material
7
Endurance Limit of Mechanical Component
8
Design of Components Subjected to Fatigue Loading
9
Design of Components Subjected to Completely Reversed Stresses
10
Design of Components Subjected to Fluctuating Stresses for Infinite Life
11
Modified Goodman Diagram
12
Summary of Design of Components Subjected to Fluctuating
13
Design of Components Subjected to Fluctuating Stresses for Finite Life
14
Fatigue Design of Components under Combined Stresses

Design of Springs

1
Introduction
2
Types of Springs
3
Terminology For Helical Compression Springs
4
Types of Ends for Helical Compression Springs
5
Types of Ends for Helical Tension Springs
6
Material for Helical Springs
7
Stresses in Helical Springs
8
Deflection of Helical Springs
9
Design of Helical Compression and Tension Springs
10
Helical Springs in Combination
11
Concentric Helical Springs
12
Design of Helical Compression Springs Subjected to Fluctuating Loads
13
Helical Torsion Springs
14
Spiral Springs
15
Leaf Springs
16
Nipping of Leaf Springs
17
Belleville or Disc Springs
18
Surge in Springs
19
Pre- Stressing of Springs: Shot Peening

Belt and Chain Drives

1
Introduction
2
Advantages and Limitations of Belt Drives
3
Types of Belts
4
Types (classification) of Flat Belt Drives
5
Materials and Construction of Flat Belt
6
Speed Ratio of Belt Drive
7
Geometrical Relationships for Belt Drives (Length of Belts)
8
Crowning of Pulley
9
Total Tension in Belt and Limiting Ratio of Tensions For Flat Belt
10
Initial Tension in Belt
11
Power Transmitted by Belt
12
Maximum Power Transmitting Capacity of Belt Drive
13
Stresses in Belt
14
Selection in Belt
15
Selection of Flat Belts from Manufacturer’s Catalogue
16
Pulley for Flat Belt Drive
17
Introduction to V- Belts
18
Limiting Ratio of Tensions For V-Belt
19
Selection of V- Belts from Manufacture’s Catalogue
20
Creep in Belts
21
Methods of Belt Tensioning
22
Timing or Toothed Belts
23
Rope Drives
24
Introduction to Chain Drives
25
Types of Power Transmission Chains
26
Geometry of Chain
27
Polygon Effect in Chain
28
Modes of Roller Chain Failure
29
Selection of Roller Chains from Manufacturer’s Catalogue
30
Lubrication of Chains
31
Sprocket Wheels

Cylinders

1
Types of Cylinders
2
Thin Cylinders
3
Thick Cylinders
4
Thick Cylinders Subjected to Internal and External Pressure
5
Thick Cylinders Subjected to Internal Pressure
6
Design of Thick Cylinders Subjected to Internal Pressure
7
Thick Cylinders Subjected to External Pressure
8
Increasing Pressure Capacity (Pre- Stressing) of Thick Cylinders
9
Methods of Pre- Stressing of Thick Cylinders
10
Gasketed Joints in Cylinders

Pressure Vessels

1
Introduction to Pressure Vessels
2
Unfired Pressure Vessels
3
Types of Welded Joints Used in Pressure Vessels
4
Categories of Welded Joints in Unfired Pressure Vessels
5
Classification of Unfired Pressure Vessels
6
Selection of Material For Unfired Pressure Vessels
7
Design of Unfired Pressure Vessels
8
Design of Pressure Vessel Shell
9
End Closures in Unfired Pressure Vessels
10
Nozzles and Openings in Unfired Pressure Vessels
11
Supports For Pressure Vessels

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Lectures: 111

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