MTech Advanced Machine Design syllabus for 2 Sem 2020 scheme 20MAU251

Introduction:

Role of failure prevention analysis in mechanical design, Modes of mechanical failure, Review of failure theories for ductile and brittle materials including Mohr’s theory and modified Mohr’s theory, Numerical examples.

Fatigue of Materials:

Introductory concepts, High cycle and low cycle fatigue, Fatigue design models, Fatigue design methods, Fatigue design criteria, Fatigue testing, Test methods and standard test specimens, Fatigue fracture surfaces and macroscopic features, Fatigue mechanisms and microscopic features.

Stress-Life (S-N) Approach:

S-N curves, Statistical nature of fatigue test data, General S-N behavior, Mean stress effects, Different factors influencing S-N behaviour, S-N curve representation and approximations, Constant life diagrams, Fatigue life estimation using SN approach.

Strain-Life (ε-N) approach:

Monotonic stress-strain behavior ,Strain controlled test methods ,Cyclic stress strain behavior ,Strain based approach to life estimation, Determination of strain life fatigue properties, Mean stress effects, Effect of surface finish, Life estimation by ε-N approach.

LEFM Approach:

LEFM concepts, Crack tip plastic zone, Fracture toughness, Fatigue crack growth, Mean stress effects, Crack growth life estimation. Notches and their effects: Concentrations and gradients in stress and strain, S-N approach for notched membranes, mean stress effects and Haigh diagrams, Notch strain analysis and the strain – life approach, Neuber’s rule, Glinka’s rule, applications of fracture mechanics to crack growth at notches

Fatigue from Variable Amplitude Loading:

Spectrum loads and cumulative damage, Damage quantification and the concepts of damage fraction and accumulation, Cumulative damage theories, Load interaction and sequence effects, Cycle counting methods, Life estimation using stress life approach

Surface Failure:

Introduction, Surface geometry, Mating surface, Friction, Adhesive wear, Abrasive wear, Corrosion wear, Surface fatigue spherical contact, Cylindrical contact, General contact, Dynamic contact stresses, Surface fatigue strength

Course outcomes:

At the end of the course the student will be able to:

CO1: Design machine components which are subjected to fluctuating loads.

CO2: Use LEFM approach for crack growth determination.

CO3: Design machine components/parts based on creep criterions. They areable to implement the concept of reliability for designing a machineparts or machine.

CO4: Explain the contact stresses and implementation of Hertz contactphenomenon to the real field problem. Identify failure modes and evolvedesign by analysis methodology.

CO5: Design against fatigue failure is given explicit attention.

Question paper pattern:

The SEE question paper will be set for 100 marks and the marks scored will be proportionately reduced to 60.

• The question paper will have ten full questions carrying equal marks.
• Each full question is for 20 marks.
• There will be two full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub question covering all the topics under a module.
• The students will have to answer five full questions, selecting one full question from each module. \\

Textbook/ Textbooks

(1) Stephens, Ali Fatemi, Robert, Henry O.Fuchs, Metal Fatigue in Engineering Ralph I. John Wiley, NewYork, 2nd Edition, 2001

(2) Jack. A. Collins, Failure of Materials in Mechanical Design John Wiley, NewYork 2nd Edition, 1993

Reference Books

(1) S .Suresh, Fatigue of Materials Cambridge University Press 2nd Edition, 2006

(2) Julie .A. Benantine, Fundamentals of Metal Fatigue Analysis Prentice Hall, IllustratedEdition, 1990

(3) Steven R. Lampman, Nikki DiMateo Fatigue and Fracture ASM Hand Book IllustratedEdition, 1996