ML3403 Mechanical Behaviour of Materials Syllabus:
ML3403 Mechanical Behaviour of Materials Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The main learning objective of this course is to prepare students for:
1. Having an overview of elastic and plastic behaviour of materials
2. Getting enlightened with the different strengthening mechanisms.
3. Obtaining an insight into the types of fracture and mechanics of fracture.
4. Interpreting the fatigue behaviour of materials.
5. Having an insight on the high temperature behaviour of materials.
UNIT I ELASTIC AND PLASTIC BEHAVIOUR
Elastic behaviour of materials – Hooke’s law, plastic behaviour: dislocation theory, Types of dislocations Burger’s vectors and dislocation loops, dislocations in the FCC, HCP and BCC lattice, stress fields and energies of dislocations, forces on and between dislocations, dislocation climb, intersections of dislocations, Jogs, dislocation sources, multiplication of dislocations, dislocation pile-ups, Slip and twinning. Methods of observing dislocations
UNIT II STRENGTHENING MECHANISMS
Elementary discussion of cold working, grain boundary strengthening. Solid solution strengthening, Martensitic strengthening, Precipitation strengthening, Particulate Strengthening, Dispersion strengthening, Fibre strengthening, Yield point phenomenon, strain aging and dynamic strain aging
UNIT III FRACTURE AND FRACTURE MECHANICS
Types of fracture, Basic mechanisms of ductile and brittle fracture, Griffith’s theory of brittle fracture, Orowan’s modification. Izod and Charpy Impacts tests, Ductile to Brittle Transition Temperature (DBTT), Factors affecting DBTT, Determination of DBTT. Fracture mechanics-Introduction, Modes of fracture, Stress intensity factor, Fracture toughness and Determination of KIC.
UNIT IV FATIGUE BEHAVIOUR AND TESTING
Fatigue: Stress cycles, S-N curves, Effect of mean stress, Factors affecting Fatigue, Structural changes accompanying fatigue, Cumulative damage- Miner law, HCF / LCF, creep- fatigue interactions, micromechanisms of fatigue crack initiation and growth, fatigue testing machines- Pari’s Equation, Residual life prediction under Fatigue. Macro, Microstructural features of fatigue fracture.
UNIT V CREEP BEHAVIOUR AND TESTING
Creep curve, Stages in creep curve and explanation, Structural changes during creep, Creep mechanisms, Metallurgical factors affecting creep, High temperature alloys, Stress rupture testing, Creep testing machines, creep life prediction-Omega (Damage rate) method, Larson-Miller (parametric) method. Deformation Mechanism Maps according to Frost/Ashby, Super plasticity.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Upon completion of this course, the students will be able to:
1. Identify the role of dislocations and the mechanisms of plastic deformation.
2. Explain the strengthening mechanisms of polycrystalline and composite materials.
3. Analyse the nature of fracture and its underlying mechanism.
4. Appraise the micro-mechanics, factors and life predictions of components under fatigue loading.
5. Assess the behaviour of materials under high temperature, metallurgical factors and life prediction of high temperature materials.
TEXT BOOKS:
1. Dieter, G. E., “Mechanical Metallurgy”, McGraw-Hill Co., SI Edition, 1995
2. Thomas H. Courtney, “ Mechanical Behaviour of Materials”, Waveland Press, 2nd edition, 2005
REFERENCES:
1. Bhargava A K & Sharma C P, “Mechanical behaviour and Testing of materials” PHI learning 2011.
2. Norman E Dowling, “Mechanical Behaviour of Materials, Pearson 2013.
3. Prashant Kumar, “Elements of Fracture Mechanics”, McGraw-Hill, 2009.
4. Shetty M N, Dislocations and mechanical behaviour of materials”, PHI learning 2013.
5. William Hosford., “Mechanical behaviour of Materials”, Cambridge University press, 2010.