ADVANCED FRACTURE MECHANICS AND STRUCTURAL INTEGRITY–MEEG

ADVANCED FRACTURE MECHANICS AND STRUCTURAL INTEGRITY–MEEG 5963 Spring Semester 2020
Instructor: Ashok Saxena, 315 John A. White Engineering Hall, [email protected], 479-530-2425, 479-466-4301 (Cell, text messages welcome) Pre-requisite: Fundamentals of Fracture
Text Book: Ashok Saxena, Advanced Fracture Mechanics and Structural Integrity, Publisher: CRC Press, Taylor and Francis Group, ISBN: 978-1-138-54426-0, Published 2019.
See the following website for buying the book: https://www.crcpress.com/Advanced-FractureMechanics-and-Structural-Integrity/Saxena/p/book/9781138544260
Course Description and Objectives: To provide an in-depth treatment of advanced topics such as fracture, crack initiation and growth under elastic-plastic and time-dependent creep and creep-fatigue conditions. The course emphasizes fundamental underpinnings of nonlinear fracture mechanics and its use in material evaluation and life prediction methodology for structural components. Micro-mechanics of fracture and crack growth processes are also covered. Upon completion of this course, the students will be ready to undertake research in areas of nonlinear fracture mechanics and/or apply the concepts to evaluate structures.
The course assumes that students have previously taken a course on Fundamentals of Fracture Mechanics and are already familiar with stress intensity parameter and how it applies to predicting crack growth and fracture under dominantly linear elastic conditions. This course addresses topics such as Analysis of Cracks under Elastic-Plastic Loading, J- Integral as Fracture Criterion, Methods of Determining J, Crack Growth Resistance Curves, Micromechanics of Ductile Fracture and Constraint Effects, Fatigue Crack Growth under Gross Plasticity, Analysis of Cracks in Creeping Bodies, Creep Crack Growth, Creep-fatigue Crack Growth, and Applications of nonlinear fracture mechanics in integrity assessment of components operating at high temperatures. Grading Policy: Term grades will be based on 6 homework assignments. The five best grades on homework assignments will count for a total of 75%. A take-home final examination will count for the remaining 25% of the grade.

Reference Books:

1. T. L. Anderson, Fracture Mechanics: Fundamentals and Applications –Second edition,CRC Press, 1995, ISBN 0-8493-4260-0 2. Various other references and internet resources to be provided in the Handouts

Course Schedule

Dates

Topic

March 6-8

Introduction and Review of Linear Elastic Fracture Mechanics Analysis of Cracks Under Elastic-Plastic Conditions

March 11-15 Methods of Estimating J-Integral

Module Chapter 1 Chapter 2 Chapter 3

March 17 March 18-22
March 24

ASSESSMENT DUE : Homework 1- 2.1, 2.2, 2.4, 2.6, 2.8, 2.12

Crack Growth Resistance Curves and Measures of

Chapter 4

Fracture Toughness

Effects of Constraint on Fracture and Stable Crack

Chapter 5

Growth

ASSESSMENT DUE: Homework 2- 3.1, 3.2, 3.9, 3.13, 4.5, 4.7

March 25-29 Microscopic Aspects of Fracture

Chapter 6

Points
15 15

March 31

ASSESSMENT DUE: Homework 3- 5.3, 5.4, 6.3, 6.6, 6.9, 6.10

15

April 01-05

Fatigue Crack Growth Under Large Scale Plasticity

Chapter 7

April 7

ASSESSMENT DUE: Homework 4- 7.1, 7.2, 7.3,7.6, 7.8, 7.10

15

April 08- 12 Analysis of Cracks in Creeping Materials

Chapter 8

April 14 April 15-19
April 21

ASSESSMENT DUE: Homework 5- 8.1, 8.2, 8.6, 8.7, 8.10

15

Creep-fatigue Crack Growth

Chapter 9

ASSESSMENT DUE: Homework 6 – 9.1, 9.3, 9.4, 9.8

15

April 22 - 26

Applications

May 02

ASSESSMENT DUE: Take Home Final Examination

25

Grading Policy Homework and take-home examination must be solely student work; in other words, no collaboration is permitted. Homework is due at midnight of the posted due date. Best five of six homework submissions will count for 15% each for a total of 75% toward the grade and the take-home final will count for 25% of the grade.