MDD (Diploma Mechanical Engineering 4th)

1. Introduction (08 hrs)

1.1 Design – Definition, Type of design, necessity of design

1.1.1 Comparison of designed and undesigned work

1.1.2 Design procedure

1.1.3 Characteristics of a good designer

1.2 Design terminology: stress, strain, factor of safety, factors affecting factor

of safety, stress concentration, methods to reduce stress concentration,

fatigue, endurance limit.

1.2.1 General design consideration

1.2.2. Codes and Standards (BIS standards)

1.3 Engineering materials and their mechanical properties :

1.3.1 Properties of engineering materials: elasticity, plasticity, malleability,

ductility, toughness, hardness and resilience. Fatigue, creep,

tenacity, strength

1.3.2 Selection of materials, criterion of material selection

2. Design Failure (05 hrs)

2.1 Various design failures-maximum stress theory, maximum strain theory, maximum strain energy theory

2.2 Classification of loads

2.3 Design under tensile, compressive and torsional loads.

3. Design of Shaft (06 hrs)

3.1 Type of shaft, shaft materials, Type of loading on shaft, standard sizes of

shaft available

3.2 Shaft subjected to torsion only, determination of shaft diameter (hollow and

solid shaft) on the basis of : - Strength criterion

- Rigidity criterion

3.3 Determination of shaft dia (hollow and solid shaft) subjected to bending

3.4 Determination of shaft dia (hollow and solid shaft) subjected to combined

torsion and bending .

4. Design of Key (04 hrs)

4.1 Types of key, materials of key, functions of key

4.2 Failure of key (by Shearing and Crushing).

4.3 Design of key (Determination of key dimension)

4.4 Effect of keyway on shaft strength. (Figures and problems).

5. Design of Screwed Joints (04 hrs)

5.1 Introduction, Advantages and Disadvantages of screw joints, location of

screw joints.

5.2 Important terms used in screw threads, designation of screw threads

5.3 Initial stresses due to screw up forces, stresses due to combined forces

5.4 Design of power screws (Press, screw jack, screw clamp)

6. Cams (03 hrs)

6.1 Types of cams and followers (theoretical)

6.2 Profile of cams for imparting following motion with knife edge and roller

followers ï‚· Uniform motion

ï‚· Simple harmonic motion

ï‚· Uniformity accelerated and retarded motion

7. Gears (02 hrs)

7.1 Nomenclature of gears and conventional representation

7.2 Drawing the actual profile of involute teeth gear by different methods