Group A
Mechanical systems and elements, overall design considerations, safety, ecological
and societal considerations in design. Codes for design-Bureau of Indian Standards
(BIS)-codes, design data handbook. Load, stress and critical sections in machine
parts.
Materials, stress-strain curves of ductile and brittle materials, cast iron, steel,
non-ferrous alloys and plastics, hardness and surface properties of materials, material
strength, factor of safety and allowable stress. Review of axial, bending, shear
and torsional loading on machine components, combined loading, two- and three- dimensional
Mohr's circle. Stresses in curved beams, thick and thin shells under pressure.
Deflection and stability, beam deflection and column buckling. Euler's formula and
Johnson's formula. Failures theories-maximum normal stress theory, maximum shear
stress theory, and maximum distortion energy theory. Application to components made
of brittle and ductile materials, stress concentration factor.
Cyclic loading and fatigue failures: Reverse bending, axial and torsion loadings,
effect of stress concentration, fatigue life prediction-Miner's rule, effect of
surface treatments (shot-peening, surface hardening) on fatigue life of components.
Design of threaded fasteners and power screws, thread forms and threaded fastener
types and materials, power screws, bolt tightening and initial tension, static and
group of bolts.
Rivets and welding: Loading, bending, direct shear, axial and bending.
Group B
Design of springs: Spring materials, helical compression and extension springs,
design for fatigue, loading, leaf sprints. Design of sliding bearings, bearing materials,
fluid viscosity, hydrodynamic lubrication, Petroff's equation, Raimondi and Boyd
chart. Heat dissipation.
Rolling elements bearings: Types, catalogue information (Timken and SKF bearings),
bearing life -radial and thrust loads. Selection of bearings. Spur, helical and
worm gears, gear tooth profile, gear geometry, module, contact ratio, gear train,
gear tooth bending strength, gear tooth surface fatigue analysis, gear material.
Design of shafts, keys, pins and splines, shaft couplings. Cotter and pin joints,
pipe joints, gaskets, seal and packing, cylinder joints, flanged joints.
Clutches and brakes: Single and multiple plate clutch, constant wear and constant
pressure theories for plate clutches, materials, shoe drum brakes, internal and
external shoe brakes.
Power transmission elements: Belts and chain drives, design of flat and V-belts.
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