DESIGN OF MACHINE MEMBERS 1 & 2

UNIT – I Objective:
To learn various factors to be considered in designing an element and to understand different theories of failures.
INTRODUCTION:
General considerations in the design of Engineering Materials and their properties – Manufacturing consideration in design. Tolerances and fits –BIS codes of steels.
STRESSES IN MACHINE MEMBERS:
Simple stresses – Combined stresses – Torsional and bending stresses – Various theories of failure – factors of safety – Design for strength and rigidity – preferred numbers. Static strength design based on fracture toughness.
STRENGTH OF MACHINE ELEMENTS
: Stress concentration –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 – II: Objectives:
The students are to be exposed to the design of riveted, welded joints and bolted joints. Rivited and welded joints – Design of joints with initial stresses Bolted joints – Design of bolts with pre-stresses – both of uniform strength.

UNIT – III : Objective:
To learn various factors to be considered in designing shafts subjected to different loads. Further, design aspects of rigid and flexible couplings. Shafts, keys and cotters:
SHAFTS
: Design of solid and hollow shafts for strength and rigidity – Design of shafts for combined bending and axial loads – Shaft sizes – BIS code. Design of Keys-stresses in keys-cottered joints-spigot and socket, sleeve and cotter.
COUPLINGS:
Design of Rigid couplings: Muff, Split muff and Flange couplings‖-Flexible couplings.

UNIT – IV : Objective:
The students are to be exposed to learn various factors to be considered in designing different types of springs.
Mechanical Springs: Stresses and deflections of helical springs – Extension and DMM – I compression springs – Springs for fatigue loading – natural frequency of helical springs – Energy storage capacity – helical torsion springs – Co-axial springs, leaf springs.

UNIT – V : Objective:
The objective is to make the students learn fundamentals of lubrication, various bearings and estimation of bearing life.
BEARINGS
: Types of Journal bearings – Lubrication – Bearing Modulus – Full and partial bearings – Clearance ratio – Heat dissipation of bearings, bearing materials – journal bearing design – Ball and roller bearings – Static loading of ball & roller bearings, Bearing life.

UNIT – VI : Objective:
The objective is to make the students use the design concepts to design various engine components.
ENGINE PARTS:
Connecting Rod: Thrust in connecting rod – stress due to whipping action on connecting rod ends – Cranks and Crank shafts, strength and proportions of over hung and center cranks – Crank pins, Crank shafts. Pistons, Forces acting on piston – Construction Design and proportions of piston, Cylinder timers.