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Course Co-ordinated by IIT Madras
Coordinators
 
Prof. K. Gopinath
IIT Madras

 
Prof. M.M. Mayuram
IIT Madras

 

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Engineering Physics I (Theory) - Web Course

 


Fatigue consideration in design                                                             12

Variable load - basic concept; load or stress variations- different patterns Cyclic stressing/straining - materials response and the origin of fatigue failure. Stress life relations; S-N curve-fatigue strength and endurance limit Factors influencing fatigue and endurance strength modification factors Effect of stress concentration and fatigue stress concentration definition Effect of mean stress - Goodman and Soderberg's relations Design approach to fatigue - design for infinite life and finite life Design of members under combined (steady and variable) loading conditions

Design of gear tooth                                                                              14

Law of gearing - conjugate action and gear tooth profile-basics Analysis of forces on spur, helical, bevel and worm gears - determination of bearing reaction forces Bending and contact stress in gear tooth-dynamic loading and wear-Lewis and Buckingham equations for design.
Design of fixed ratio gear box-general design procedure

Design of sliding and journal bearings                                                   6

Types of lubrication-hydro dynamic, hydro static and EHD lubrication. Petroff’s equation and the bearing haracteristic number-boundary and film lubrication Pressure distribution-eccentricity and minimum film thickness Heat generation and thermal equilibrium

Design/analysis of Brakes clutches and fly wheels                                 8

Plate clutches – design for uniform pressure and wear Shoe breakes – short and long shoe analysis – automotive shoe breake – design/analysis Ply wheel design basic concepts.

DETAILED LECTURE WISE COVERAGE

Module I - Fatigue consideration in design                                          12 Hours

Lecture 1 -Variable load- basic concept; Terminology associated with variable loading;Patterns of load or stress variations
Lecture 2 -Cyclic stressing/straining-and materials response to cyclic loading
Lecture 3 -The mechanism of fatigue failure; origin and propagation of crack
Lecture 4- Stress life relations; S-N curve-fatigue strength and endurance limit
Lecture 5 -Factors influencing fatigue
Lecture 6 -Endurance strength modification factors
Lecture 7 -Effect of stress concentration and fatigue stress concentration definition and its estimation from geometric stress concentration factor
Lecture 8 -Effect of mean stress- Goodman and Soderberg's relations
Lecture 9 -Design approach to fatigue- design for infinite life and finite life
Lecture 10 -Approach/Methods for design of members under combined (steady and variable) loading conditions
Lecture 11- Worked out examples on fatigue design problems
Lecture 12- --do-

Module 2 -Design of gear tooth                                                            14- Hours

Lecture 1 -Gears-types and application and gear terminology
Lecture 2 -Law of gearing-conjugate action and interference in gears
Lecture 3 -Gear tooth profiles, involute profile -basics, Influence of number of teeth and pressure angle Lecture 4- Analysis of forces on spur, and helical gears
Lecture 5 -Bending and contact stress in gear tooth-
Lecture 6 -Lewise equation for design
Lecture 7 -Dynamic loading and wear-Buckingham equations for design.
Lecture 8 -Gear quality and selection aspects
Lecture 9-Force analysis on bevel and worm gears
Lecture 10- Design approach for bevel gears- equivalent tooth
Lecture 1 I -Design of fixed ratio gear box- general design procedure
Lecture 12 -Worked out example on design of a single stage reduction gear unit
Lecture 13- and 14- Determination of bearing reaction due to gear forces- Worked out examples

Module 3 -Design of sliding and journal bearings                                6 Hours

Lecture I -Types of lubrication- hydro dynamic, hydro static and EHD lubrication.
Lecture 2 -Petroff's equation and the bearing characteristic number
Lecture 3- Lubrication regimes- boundary and film lubrication
Lecture 4 -Hydro dynamic bearings- Pressure distribution-eccentricity and minimum film thickness
Lecture 5 -Reynolds equation and use of bearing design charts
Lecture 6 -Heat generation and thermal equilibrium

Module 4 -Design/analysis of Brakes clutches and fly wheels               8 Hours
Lecture 1- Brakes and clutches -need and functioning -dynamic model
Lecture 2 -Plate clutches- design for uniform pressure and wear
Lecture 3- Shoe brakes- short and long shoe analysis
Lecture 4- Automotive shoe brake-design/analysis
Lecture 5 -Fly wheel basic concepts -design requirements
Lecture 6 -Moment diagram and energy estimations
Lecture 7- Worked out examples on brakes and clutches
Lecture 8 -Worked out examples on fly wheels

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