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Swayam Central

Dynamic Behaviour of Materials

By Prof. Prasenjit Khanikar   |   IIT Guwahati
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

Learners enrolled: 940

SUMMARY

Course Status : Ongoing
Course Type : Elective
Duration : 12 weeks
Start Date : 29 Jul 2019
End Date : 18 Oct 2019
Exam Date : 16 Nov 2019
Category :
  • Mechanical Engineering
  • Level : Undergraduate
    This is an AICTE approved FDP course

    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 : 
    1. Marc A. Meyers, Dynamic Behavior of Materials, John Wiley & Sons, New York, 1994 
    References: 
    1. L.B. Freund, Dynamic Fracture Mechanics, Cambridge, 1990
    2. Y. Bai 
     B. Dodd, Adiabatic Shear Localization, Pergamon, Oxford, UK, 1992
    3. G.E. Dieter, Mechanical Metallurgy, Mc Graw Hill, 1986
    4. J.W. Swegle, D.E. Grady, in Shock Waves in Condensed Matter- 1985,
    5. eds. Y.M. Gupta, Plenum, New York, 1986

    INSTRUCTOR BIO



    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: 16 November 2019, 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 are being discontinued from July 2019 semester and will not be dispatched

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