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SYLLABUS

Unit - I :

STEADY STRESSES AND VARIABLE STRESSES IN MACHINE MEMBERS Introduction to the design process – Factors influencing machine design, selection of materials based on mechanical properties – Preferred numbers, fits and tolerances – Direct, bending and torsional stress equations – Impact and shock loading – Calculation of principal stresses for various load combinations, eccentric loading – Curved beams – Crane hook and ‘C’ frame – Factor of safety – Theories of failure – Design based on strength and stiffness – Stress concentration – Design for variable loading.

Unit - II :

SHAFTS AND COUPLINGS Design of solid and hollow shafts based on strength, rigidity and critical speed – Keys, keyways and splines – Rigid and flexible couplings.

Unit - III :

TEMPORARY AND PERMANENT JOINTS Threaded fastners – Bolted joints including eccentric loading, Knuckle joints, Cotter joints – Welded joints, Riveted joints for structures – Theory of bonded joints.

Unit - IV :

ENERGY STORING ELEMENTS AND ENGINE COMPONENTS Various types of springs, optimization of helical springs – Rubber springs – Flywheels considering stresses in rims and arms for engines and punching machines – Connecting rods and crank shafts.

Unit - V :

bearings Sliding contact and rolling contact bearings – Hydrodynamic journal bearings, Sommerfeld number, Raimondi and Boyd graphs, – Selection of rolling contact bearings.