JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course Overview: This course deals the Systematic approach to design, standardization, Design and Manufacturing, Engineering Materials, Simple Stresses and Compound Stresses in Machine Elements, Design For Strength, strength of mechanical elements; theories of failure under static and dynamic loading situations; impact loading, Design of Fasteners, Design of joints, Design Of Keys and cotter joints, Shaft Couplings, Rivet Joints, Welded Joints, Design of Springs and Shafts.

Course Objectives:

• 1. To enhance the ability of students to apply mathematics and fundamentals of science for design Machine elements.
• 2. To develop good and careful problem formulation and solution skills for designing selected machine components and systems.
• 3. To develop an ability to make proper analysis and assumptions by employing the concepts and theories.
• 4. To develop a working knowledge in the use of various standard procedures and catalog information in the identification and selection of engineering materials.

Course Outcomes:

• 1. Students should be able to understand design and manufacturing considerations
• 2. Students should be able to understand Engineering materials and their properties, BIS codes for steels
• 3. Students should be able to understand stresses in machine members
• 4. Students should be able to understand Fatigue loading, stress concentration, endurance limit, theories of failure.
• 5. Students should be able to understand riveted joints, bolted joints, cotter, knuckle joints, keys, couplings
• 6. Students should be able to understand stresses and design of shaft
• 7. Students should be able to understand deflections in springs.
• 8. Students Can participate and succeed in competitive examinations like GATE, IES

UNIT - I

Introduction: General considerations. Classification of Machine Design. Steps involved in Machine Design. Stresses in Machine Members: 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, Static strength design based on fracture toughness.

UNIT - II

Strength Of Machine Elements : Stress concentration ,Theoretical stress Concentration factor, Fatigue stress concentration factor notch sensitivity , Design for fluctuating stresses , Endurance limit , Estimation of Endurance strength , Goodman’s line , Soderberg’s line , Modified Goodman’s line.

UNIT - III

Riveted and Welded Joints: Design of joints with initial stresses, eccentric loading Bolted Joints: Design of bolts with pre-stresses, Design of joints under eccentric loading, locking devices, both of uniform strength, different seals.

UNIT - IV

Keys, Cotters And Knuckle Joints, Shafts: Design of Keys, stresses in keys, cottered joints, spigot and socket, sleeve and cotter, jib and cotter joints- Knuckle joints. Shafts: Design of solid and hollow shafts for strength and rigidity, Design of shafts for combined bending and axial loads, Shaft sizes, BIS code. Use of internal and external circlips, Gaskets, and seals (stationary & rotary).

UNIT - V

Shaft Coupling: Rigid couplings, Muff, Split muff and Flange couplings. Flexible couplings, Flange coupling (Modified) Mechanical Springs: Stresses and deflections of helical springs, Extension, compression springs, Springs for fatigue loading, natural frequency of helical springs, Energy storage capacity, helical torsion springs, Co-axial springs, leaf springs.

TEXT BOOKS

• 1. V. Bandari (2011), A Text Book of Design of Machine Elements, 3 rd edition, Tata McGraw hill education (P) ltd, New Delhi, India.
• 2. R. L. Norton (2006), Machine Design (An Integrated approach), 2 nd edition, Pearson Publishers, Chennai, India.

REFERENCE BOOKS

• 1. Shigley, J.E, (2011), Mechanical Engineering Design, 9th Edition, Tata McGraw-Hill, New Delhi, India.
• 2. S. M.D. Jalaludin, (2011), Machine Design, 3rd Edition, Anuradha Publishers, Kumbakonam, Chennai, India.
• 3. P. Kannaiah, (2012), Machine Design, 2 nd Edition, Scitech Publications India Pvt. Ltd, New Delhi, India.