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Students those who are studying JNTUK R19 Mechanical Branch, Can Download Unit wise R19 2-2 Design of Machine Members-I (DMM-I) Material/Notes PDFs below.

OBJECTIVES:

• The student shall gain appreciation and understanding of the design function in mechanical engineering, the steps involved in designing and the relation of design activity with manufacturing activity
• Able to select proper materials to different machine elements based on their physical and mechanical properties.
• Learn and understand of the different types of failure modes and criteria.
• Procedure for the different machine elements such as fasteners, shafts, couplings, keys, axially know loaded joints etc.
• To be able to know standards in design.

UNIT-1

INTRODUCTION: General considerations in the design of Engineering Materials and their properties – selection –Manufacturing consideration in design–BIS codes of steels.

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-2

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, Gerber’s parabola.

UNIT-3

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 – bolts of uniform strength. KEYS, COTTERS AND KNUCKLE JOINTS: Design of keys-stresses in keys-cotter joints-spigot and socket, sleeve and cotter, jib and cotter joints- knuckle joints.

UNIT-4

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).

SHAFT COUPLING: Rigid couplings – muff, split muff and flange couplings: rigid flanged coupling, protected rigid flanged coupling, Bushed pin type flexible coupling.

UNIT-5

MECHANICAL SPRINGS: Stresses and deflections of helical springs – extension -compression springs – springs for fatigue loading, energy storage capacity – helical torsion springs – co-axial springs, leaf springs.

TEXT BOOKS:

1. Machine Design/ Shigley, J.E/McGraw Hill
2. Machine Design/V.B.Bhandari/ McGrawHill Education

REFERENCE BOOKS:

1. Machine design / Schaum Series/McGrawHill Professional
2. Machine Design / Norton/ Pearson publishers
3. Machine design / NC Pandya & CS Shah/Charotar Publishing House Pvt. Limited

OUTCOMES:

• Calculate different stresses in the machine components subjected to various static loads, failures and suitability of a material for an engineering application.
• Calculate dynamic stresses in the machine components subjected to variable loads.
• Design riveted, welded, bolted joints, keys, cotters and knuckle joints subjected to static loads and their failure modes
• Design the machine shafts and suggest suitable coupling for a given application.
• Calculate stresses in different types of springs subjected to static loads and dynamic loads.