ME 303

DESIGN OF MACHINE ELEMENTS

UNIT-I

Design considerations of Machine Elements.  Materials used in machine design and their specifications according to Indian Standards.  Codes and standards used in design.  Important mechanical properties of materials used in design.  Preferred numbers.  Manufacturing considerations in design.  Review of types of loads and simple stresses.  Stresses due to Biaxal and Triaxal loads.  Factor of safety.  Theories of failures.  Design of components subjected to impact loading.

UNIT-II

Design for Fatigue:  Fluctuating stresses, fatigue strength and endurance limit, Stress concentration factor and Notch sensitivity.  Factor effecting fatigue strength.  S-N diagram, Soderberg and Modified Goodman’s diagrams for fatigue design.  Cumulative fatigue – Miner’s rule.

UNIT-III

Design of shafts:  Solid, hallow and splined shafts under torsion and bending loads.  Design of keys.  Design of couplings – Muff, Split muff, Flange, Flexible, Marine type couplings and slip couplings.

UNIT-IV

Design of Joints:  Cotter and Knuckle joints.  Design of pulleys.  Design of chains drives linked and laminated chains.  Design of bolts and nuts, Locking devices for nuts, Bolts of uniform strength.  Bolted joints under eccentric loads.  Design of gasket joints.

UNIT-V

Design of power screws and screw jack.  Differential and Compound Screws.  Design of riveted and welded joints under direct and eccentric loads.

Suggested Books:

1. 1.M.F. Spotts, Design of Machine Elements, Pearson Edu, 7^th Ed. 2003.
2. 2.V.B. Bhandari, Machine Design, Tata McGraw – Hill Publ, 2004.
3. 3.P.C. Sharma & D.K. Aggarwal, Machine Design, S.K. Kataria & Sons, 10^th ed, 2003.
4. 4.P. Kannaiah, Machine Design, Scu-Tech Publ., 2003
5. 5.J.E.. Shigley & Charles R. Mischke, Mechanical Engineering Design, Tata McGraw-Hill, 6^th ed., 2003.