Design of Machine Elements

Types of Design

Adaptive Design

Developmental Design

New Design

Factors influencing Machine Design

Strength

Durability

Flexibility

Weight

Machinability

Ability to cast, weld or hardened

Design process

Analysis

Direct, bending and torsional stess

Impact and shock loading

Theories of failure

variable loading

Modification

Detailed drawing

production

Selection of materials

Material properties

Manufacturing ease

Material availability

Cost

Design of shafts

Stresses in the shafts

Shear stresses

Bending stresses

Assumptions

Linear elastic

Homogeneous

Isotropic

Based on

Strength

Rigidity

Stiffness

Design of joints

Welded joint

Rivetted joint

Lap joint

Butt Joint

Threaded fastener joints

Cotter joint

Knuckle joint

Design of springs

Helical springs

Belleville springs

Leaf springs

Design of bearings

Materials

Babbit metal

Bronze

Cast iron

Silver

Lubricants

Liquid

Semi Liquid

Solid

Sliding contact bearings

Full Journal

Partial Journal

Fitted journal

Rolling contact bearings

Ball bearing

Roller bearing