JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

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. Stresses In Machine Members: Simple stresses – Complex Stresses – impact stress strain relations – Static theories of failure – factors of safety – Design for strength and rigidity – preferred numbers. The concept of stiffness in tension, bending, torsion and combined situations. Fatigue Loading: Stress concentration – Theoretical stress Concentration factor – Fatigue stress concentration factor notch sensitivity – Design for fluctuating stresses – Endurance limit – Estimation of Endurance strength – Fatigue theories of failure Goodman and Soderberg’s lines.

UNIT - II

Rivited and welded joints: Riveted Joints: Modes of failure f riveted joints-Strength equations – efficiency of riveted joints-Design of boiler joints – eccentricity loaded riveted joints. Welding Joints: Design of fillet welds-axial loads – Circular fillet welds-bending and torsion-eccentricity loaded joints. Axially Loaded Joints and Shafts: Keys, cotters and knuckle joints: Design of Keys stresses in key- cottered joints-spigot and socket, sleeve and cotter, jib and cotter joints-knuckle joints. Design of shafts: Design of solid and hollow shafts for strength and rigidity – Design of shafts of complex loads- Shaft sizes – BIS code. Design of shafts for gear and belt drives

UNIT - III

Power Transmissions Systems, Pulleys: Transmission of power by Belt and Rope drives, Transmission efficiencies, Belts – Flat and V types – Ropes - pulleys for belt and rope drives, Materials, Chain drives

UNIT - IV

Spur & Helical Gear Drives: Spur gears& Helical gears – Load concentration factor – Dynamic load factor. Surface compressive strength – Bending strength – Design analysis of spur and helical gears – Estimation of centre distance, module and face width, check for plastic deformation. Check for dynamic and wear considerations.

UNIT - V

Bearings: Types of bearings – Basic modes of Lubrication – Bearing Construction-Bearing design- bearing materials-Selection of Lubricants. Rolling contact bearings: Types of rolling contact bearings- Selection of bearing type-Selection of bearing life-Design for cyclic loads and speeds-static and dynamic loading of ball & roller bearings

TEXT BOOKS:

• 1. Mechanical Engineering Design by Bahland Goel, Standard Publications
• 2. Design of Machine Elements by kulakarni – Mc Graw Hill - 3rd

REFERENCE BOOKS:

• 1. Machine design by timothy H. Wenzell PE, Cengage
• 2. Machine design by r.L. Norton, Mc Graw hill
• 3. Machine design by V. Bandari, TMH Publishers
• 4. Machine design – Pandya & shah. R18 B.TECH MECHATRONICS III YEAR