Introduction: Designation and Mechanical properties of Engineering Materials, design considerations, basic design concept (strength consideration), Failure of brittle materials, Failure of ductile materials, factor of safety, criteria for selection of factor of safety, design of simple machine members subjected to static loading (including eccentric load) [limited to biaxial stresses (normal, shear, bending, torsional, crushing/bearing, principal stresses)].
Theories of Failure: Maximum normal stress theory, Maximum shear stress theory, Distortion energy theory.
Stress Concentration: Stress concentration factor, design of simple elements with stress raisers.
Impact Strength: Introduction, Impact stresses due to axial, bending and torsional loads, effect of inertia.
Design for fatigue strength: Introduction, types of fluctuating stresses, fatigue and endurance limit, S-N Diagram, Low cycle fatigue, High cycle fatigue, endurance limit modifying factors: load, size and surface factors, Stress concentration effects; notch sensitivity, design for infinite life, combined steady and variable stress, Soderberg and Goodman relationship, stresses due to combined loading, cumulative fatigue damage – Miner’s equation.
Design of Simple Machine Elements: Design of Knuckle joints. Keys: Types of keys, Design of keys, Couplings, types of couplings, design of flange type of rigid coupling.
Design of Shaft: Introduction, types of shafts, shafts subjected to combine bending and twisting, shaft design (including hollow shafts) based on strength, shaft design based on torsional rigidity, ASME code for shaft design.
Riveted Joints: Introduction, methods of riveting, Types of rivets, rivet materials, types of riveted joints, failures of riveted joints, joint efficiency.
Welded Joints: Introduction, types of welded joints, design of welded joints (butt joints, fillet welds, axially loaded unsymmetrical welded joints, eccentrically loaded welded joints).
Threaded Joints: Introduction, basic terminology of screw threads, types of screw threads, types of screw fastenings, designations of screw threads, Stresses in threaded fasteners due to static loading, Effect of initial tension, threaded joints for cylinder covers, design of eccentrically loaded bolted joints.
Power Screws: Introduction, Types of screw threads used for power screws, Design of Power Screws, efficiency, self-locking and over hauling. Design of screw jack.
Course Outcomes:
At the end of the course the student will be able to:
Question paper pattern:
Textbook/s
1 Design of Machine Elements V. B. Bhandari Tata McGraw Hill Publishing Company Ltd New Delhi 2nd Edition 2007
2 Mechanical Engineering Design Joseph E shigley and Charles R. G. Budynas McGraw hill international edition- 6 , 2009.
3 Design Data Hand Book K. Lingaiah McGraw Hill 2nd Ed.2003
4 Design Data Hand Book K. Mahadevan and Balaveera Reddy CBS Publication. 2001
Reference Books
3 Theory and problems of Machine Design (Schaum’s Outlines series), Hall, Holowenko, Tata McGraw Hill Publishing Company Ltd., New Delhi. 2014
4 Machine design-I J. B. K. Das Laughlin Sapna Book House, Bangalore 2010