Engineering Fracture Mechanics

By Prof. K. Ramesh | IIT Madras

Learners enrolled: 1090

The course covers the basic aspects of Engineering Fracture Mechanics. Spectacular failures that triggered the birth of fracture mechanics, Modes of loading, Classification as LEFM and EPFM, Crack growth and fracture mechanisms, Energy release rate, Resistance, Griffith Theory of fracture, Extension of Griffith Theory by Irwin and Orowan, R-Curve, Pop-in phenomena, Crack branching. Necessary and sufficient conditions for fracture, Stress and Displacement fields in the very near and near-tip fields, Westergaard, Williams and Generalised Westergaard solutions, Influence of the T-stress and higher order terms, Role of photoelasticity on the development of stress field equations in fracture mechanics, Equivalence between SIF and G, Various methods for evaluating Stress Intensity Factors, Modeling plastic zone at the crack-tip, Irwin and Dugdale models, Fracture toughness testing,Fedderson TMs residual strength diagram, Paris law, J-integral, HRR field, Mixed-mode fracture, Crack arrest methodologies.

Intended Audience : Students in Engineering Colleges and working professionals in similar areas

Pre-requisites : Basic course on Strength of Materials. Course on Theory of Elasticity desirable

Industry Support : HAL, Honeywell, GE, GM, NAL, DMRL, DRDO, BEML, Mahindra&Mahindra, Tata Motors, L&T, VSSC, Defense and Atomic energy
Laboratories

Summary

Course Status :	Completed
Course Type :	Core
Language for course content :	English
Duration :	12 weeks
Category :	Mechanical Engineering
Credit Points :	3
Level :	Postgraduate
Start Date :	29 Jul 2019
End Date :	18 Oct 2019
Exam Date :	16 Nov 2019 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 : EFM Course outline and Spectacular Failures

Week 2 : Introduction to LEFM and EPFM, Fatigue Crack Growth Model

Week 3 : Crack Growth and Fracture Mechanisms, Griffith TMs Theory of Fracture

Week 4 : Energy Release Rate

Week 5 : Review of Theory of Elasticity

Week 6 : Westergaard Solution for Stress and Displacements for Mode I, Relationship between K and G

Week 7 : Introduction to multi parameter stress field for Mode I, Mode II and Mixed Modes

Week 8 : SIF for Various Geometries

Week 9 : Modeling Plastic Deformation, Irwin TMs model, Dugdale Model

Week 10 : Fracture Toughness Testing, Paris Law and Sigmoidal curve

Week 11 : Crack Closure, Crack Growth Models, J-Integral

Week 12 : Failure Assessment Diagram, Mixed Mode Fracture, Crack Arrest and Repair Methodologies

Books and references

1. K. Ramesh, e-Book on Engineering Fracture Mechanics, IIT Madras, 2007. Visit Page

2. Prashant Kumar, Elements of Fracture Mechanics, Tata McGraw Hill, New Delhi, India, 2009.

3. K. R.Y. Simha, Fracture Mechanics for Modern Engineering Design, Universities Press (India) Limited,2001

4. D. Broek, Elementary Engineering Fracture Mechanics, Kluwer Academic Publishers, Dordrecht, 1986.

5. T.L. Anderson, Fracture Mechanics "Fundamentals and Applications, 3rd Edition, Taylor and Francis Group, 2005.

Instructor bio

Prof. K. Ramesh is currently a Senior Professor at the Department of Applied Mechanics, IIT Madras; as its Chairman during (2005-2009) and formerly a Professor at the Department of Mechanical Engineering, IIT Kanpur. He received his undergraduate degree in Mechanical Engineering from the Regional Engineering College, Trichy (now NIT, Trichy), Postgraduate degree from the Indian Institute of Science, Bangalore and the Doctoral Degree from the Indian Institute of Technology Madras.

He has made significant contributions to the advancement of Digital Photoelasticity. This has resulted in a Monograph on Digital Photoelasticity - Advanced Techniques and Applications (2000), Springer, a chapter on Photoelasticity in the Springer Handbook of Experimental Solid Mechanics (2009) and a chapter on Digital Photoelasticity in the book on Digital Optical Measurement Techniques and Applications (2015), Artech House London. He has over 170 publications to date of which two have been reproduced in the Milestone Series of SPIE. His research has been funded by organizations such as ARDB, ISRO, DST, and NSF. He received the Zandman award for the year 2012, the only Indian to receive it since its inception in 1989, instituted by the Society for Experimental Mechanics, USA for his outstanding research contributions in applications utilizing photoelastic coatings.

He has pioneered a new paradigm in Engineering Education by writing innovative e-Books on Engineering Fracture Mechanics and Experimental Stress Analysis published by IIT Madras. These books are first of their kind in the world and can be truly called as e -Teachers. He has co-authored a book on Mechanical Sciences, Narosa Publishing House, India and has contributed a chapter on Experimental Stress Analysis – An Overview, in the book on Optical Methods for Solid Mechanics, Wiley-VCH Verlag. He has also given Video lectures of 40 hrs. each on Experimental Stress Analysis and Engineering Fracture Mechanics as part of the National Program for Technology Enhanced Learning (NPTEL), India. He has also developed innovative tools for teaching various courses that include software such as PSCOPETM and analysis package for processing photoelastic data such as DigiTFPTM.

He is a Fellow of the Indian National Academy of Engineering since 2006. Other recognitions and awards include: Certificate of Excellence in Reviewing from Elsevier for the journal OLEN (2013), Distinguished Alumnus Award of NIT, Trichy (2008), Outstanding Young Individual of Kanpur award instituted by the Kanpur Industrial Junior Chamber (1993), President of India Cash Prize (1984). Member of the Editorial Boards of the International Journals: Strain (since 2001), Journal of Strain Analysis for Engineering Design (2009-10), Optics and Lasers in Engineering, and Steering committee member of Asian Society for Experimental Mechanics since its inception in 2000. For details see: http://apm.iitm.ac.in/smlab/kramesh/index.html

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 Madras. 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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