UNIT - I Introduction : General considerations in the design of engineering materials and their properties - Selection - Manufacturing consideration in design. Tolerances and fits - BIS codes of steels. Design for static strength: Simple stresses - Combined stresses - Torsional and bending stresses - Impact stresses - Stress strain relation - Various theories of failure - Factor of safety - Design for strength and rigidity - Preferred numbers. The concept of stiffness in tension, Bending, Torsion and combined situations. (Chapter - 1) UNIT - II Design for fatigue strength: Stress concentration - Theoretical stress concentration factor - Fatigue stress concentration factor - Notch sensitivity - Design for fluctuating stresses - Endurance limit - Estimation of endurance strength - Gerber's curve - Goodman's line - Soderberg's line. (Chapter - 2) UNIT - III Riveted, Welded and Bolted joints : Riveted joints - Methods of failure of riveted joints - Strength equations - Efficiency of riveted joints - Eccentrically loaded riveted joints. Welded joints - Design of fillet welds - Axial loads - Circular fillet welds under bending, Torsion, Welded joints under eccentric loading. Bolted joints - Design of bolts with pre-stresses - Design of joints under eccentric loading - Locking devices - Bolts of uniform strength. (Chapter - 3) UNIT - IV Keys, cotters and knuckle joints : Design of keys-Stresses in keys-Cottered joints - Spigot and socket, Sleeve and cotter, Jib and cotter joints - Knuckle joints. (Chapter - 4) UNIT - V Shafts : Design of solid and hollow shafts for strength and rigidity - Design of shafts for combined bending and axial loads - Shaft sizes - BIS code. Gaskets and seals (Stationary and rotary). Shaft couplings: Rigid couplings - Muff, Split muff and flange couplings. Flexible couplings - Flange coupling (Modified). (Chapter - 5)
