Dynamic Behaviour Of Materials

By Prof. Prasenjit Khanikar | IIT Guwahati

Learners enrolled: 375

ABOUT THE COURSE:

Study of materials behavior in extreme environments and development of new materials for such environments has become a vital research area for materials scientists and engineers in the 21 st century. Mechanical properties of materials under dynamic loading are considered as an important area of research and development in defense, automotive and aerospace industries. Under dynamic loading conditions, the inertial effects come to play an important role in the deformation behavior of the material. Many materials exhibit strain rate sensitivity at higher strain rates, i.e., flow stress dependence on strain rates. In addition, the failure mechanisms under high strain rate loading conditions are generally different than those occur in low strain rate. Furthermore, the deformation and failure mechanisms are controlled by the microstructure of the materials. This course will be important to mechanical, materials and civil engineers to understand materials behavior for ballistic applications, explosive forming or welding applications, automotive and aerospace applications.

INTENDED AUDIENCE: Mechanical Engineers, Civil Engineers, Materials Engineers

PREREQUISITES: Solid Mechanics and basic Materials Science course

Summary

Course Status :	Completed
Course Type :	Elective
Language for course content :
Duration :	12 weeks
Category :	Mechanical Engineering Advanced Mechanics
Credit Points :	3
Level :	Postgraduate
Start Date :	25 Jul 2022
End Date :	14 Oct 2022
Enrollment Ends :	08 Aug 2022
Exam Date :	30 Oct 2022 IST

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1: Introduction: dynamic deformation and failure

Week 2: Introduction to waves: elastic waves; types of elastic waves; reflection, refraction and interaction of waves

Week 3: Plastic waves and shock waves: Plastic waves of uniaxial stress, uniaxial strain and combined stress; Taylor’s experiments; shock waves

Week 4: Shock wave induced phase transformation; Explosive-material interaction and detonation

Week 5: Experimental techniques for dynamic deformation: intermediate strain rate tests; split Hopkinson pressure bar; expanding ring test; gun systems

Week 6: Review of mechanical behavior of materials (especially metals): Elastic and plastic deformation of metals; dislocation mechanics;

Week 7: Plastic deformation of metals at high strain rates: Empirical constitutive equations; relationship between dislocation velocity and applied stress; physically based constitute equations

Week 8: Plastic deformation in shock waves: Strengthening due to shock wave propagation; dislocation generation; point defect generation and deformation twinning

Week 9: Strain localization/shear bands: Constitutive models; metallurgical aspects

Week 10: Dynamic Fracture: Fundamentals of fracture mechanics; limiting crack speed, crack branching and dynamic fracture toughness; spalling and fragmentation

Week 11: Dynamic deformation of materials other than metals: Polymers; ceramics; composites

Week 12: Applications: Armor applications; explosive welding and forming

Books and references

Textbook :

Marc A. Meyers, Dynamic Behavior of Materials, John Wiley & Sons, New York, 1994

References:

L.B. Freund, Dynamic Fracture Mechanics, Cambridge, 1990
Y. Bai B. Dodd, Adiabatic Shear Localization, Pergamon, Oxford, UK, 1992
G.E. Dieter, Mechanical Metallurgy, Mc Graw Hill, 1986
J.W. Swegle, D.E. Grady, in Shock Waves in Condensed Matter- 1985,
eds. Y.M. Gupta, Plenum, New York, 1986

Instructor bio

Prof. Prasenjit Khanikar

IIT Guwahati

Prof. Prasenjit Khanikar is an Assistant Professor of Mechanical Engineering Department at the Indian Institute of Technology Guwahati. His research interests include development of materials and structures for high strain rate applications, modeling and experimental characterization of materials microstructure and crystalline plasticity. Dr. Khanikar received his PhD in Mechanical Engineering from North Carolina State University, USA. Before joining IIT Guwahati, he was working as a Postdoctoral Research Scientist at Columbia University in the City of New York, USA.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 30 October 2022 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Guwahati. It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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