Course Details
Subject {L-T-P / C} : MM3201 : Deformation Behavior of Materials { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Natraj Yedla
Syllabus
Elastic behavior: concept of elasticity in three dimensions, Generalised Hook’s law, Plane stress and plane strain state, Strain energy, Stress intensity factor. Theory of plasticity: Flow curve Yield criteria, Plastic stress-strain relationship. Dislocation theory: Line defects, Deformation by slip, Theoretical shear strength, Critical resolved shear stress, Burgers vector and dislocation loop, Edge, Screw, Mixed and Partial dislocations, dislocation reactions, dislocations in FCC and BCC crystals, Cross slip and climb of dislocations, Interaction of dislocations, energy of dislocations, Forces on dislocations, Dislocation sources and multiplication of dislocations. Dislocation pile-ups and Bauschinger’s effect, Strain hardening in single crystals and polycrystals, Yield point phenomenon, strain aging, Dynamic strain aging, strengthening mechanisms. Deformation Twinning: Classification, Slip vs. twinning, Stress for twinning.
Course Objectives
- To develop an understanding on the stress and strain relationships for elastic behavior.
- To provide insights into the yielding criterion, stress and strain relationships.
- To make understand the deformation mechanisms in metals/alloys and correlation with the deformation behavior.
- Identifying the role of defects and their interactions on the strength and fracture of metals.
Course Outcomes
1. Knowledge on the elastic deformation, elastic constants and their relationships. <br />2. To solve problems related to elasticity. <br />3. An understanding on the plastic behavior and theories of yielding. <br />4. To solve problems related to plasticity. <br />5. To identify ductile/brittle metallic systems based on the knowledge of slip systems. <br />6. To improve the strength/ductility of the metals/alloys from the knowledge of deformation mechanisms and <br /> strengthening mechanisms.
Essential Reading
- Dieter, Mechanical Metallurgy, USA. New York: McGraw-Hill: , ISBN-0-07-084187-X
- D. Hull and DC Bacon, Introduction to dislocations, Elsevier Butterworth-Heinemann,2009 , ISBN: 978-81-312-2105-1
Supplementary Reading
- Hertzberg, R. W., & Saunders, H, Deformation and fracture mechanics of engineering materials, John Wiley & Sons, 2011 , ISBN-978-81-265-3042-7
- Shetty, M. N., Dislocations and mechanical behaviour of materials, PHI Learning, 2013 , ISBN-978-81-203-4638-3