MECH ENG 4120 - Fracture Mechanics
North Terrace Campus - Semester 2 - 2014
General Course Information
Course Code MECH ENG 4120 Course Fracture Mechanics Coordinating Unit School of Mechanical Engineering Term Semester 2 Level Undergraduate Location/s North Terrace Campus Units 3 Contact Up to 4 hours per week Assumed Knowledge MATHS 2202, MECH ENG 2002 & MECH ENG 3030 (or equivalent) Course Description The focus of this course is to develop an understanding of the mechanics of fracture of engineering materials and structures under static and dynamic loading. Students will be taught the principles of linear elastic and elastic-plastic fracture mechanics and their application to engineering design. This course will also introduce key applications of fracture mechanics in industry including damage detection, failure analysis, and experimental techniques.
Course Coordinator: Dr John Codrington
The full timetable of all activities for this course can be accessed from Course Planner.Each week consists of lectures and tutorial/lab classes. Further details will be provided in the lectures.
Course Learning Outcomes
The aim of this course is to develop an understanding of the mechanics of fracture of engineering materials and structures under static and dynamic loading. This understanding is essential for the assessment of integrity and durability of structures and structural components in the presence of structural defects, so as to ensure reliability and safety. At the completion of the course, students will:
1 Have a solid foundation in the theory, concepts and principles of fracture mechanics, 2 Be gaining the physical intuition necessary to idealise a complicated practical problem, 3 Possess the analytical and computational tools needed to solve the idealised problem, 4 Have acquired the judgment required to interpret the results of these solutions, 5 Be able to use these solutions to guide a corresponding design, manufacture, or failure analysis and, 6 Be able to work independently and as part of a team in order to implement their skills and knowledge in both theoretical and practical applications.
University Graduate Attributes
This course will provide students with an opportunity to develop the Graduate Attribute(s) specified below:
University Graduate Attribute Course Learning Outcome(s) Knowledge and understanding of the content and techniques of a chosen discipline at advanced levels that are internationally recognised. 1-5 The ability to locate, analyse, evaluate and synthesise information from a wide variety of sources in a planned and timely manner. 1-5 An ability to apply effective, creative and innovative solutions, both independently and cooperatively, to current and future problems. 1-6 Skills of a high order in interpersonal understanding, teamwork and communication. 6 A proficiency in the appropriate use of contemporary technologies. 1,3,5 A commitment to continuous learning and the capacity to maintain intellectual curiosity throughout life. 1,2,6
Extensive lecture notes are provided. The purchase of text-books is not necessary for the successful completion of this course though it is encouraged for extra learning.
Electronic copies of the lecture notes as well as any additional material provided in-class will be available through the online myuni system.
Many suitable text-books are available for further reading through the University of Adelaide Library, and are available for purchase from text-book suppliers.
- Anderson, T.L. Fracture Mechanics – Fundamentals and Applications. CRC Press.
- Janssen, M., Zuidema, J., Wanhill, R. Fracture Mechanics. Spon Press.
Electronic copies of the lecture notes as well as any additional material provided in-class will be available through the online myuni system. Extended study material will also be provided through the online system for students keen to gain further knowledge and application.
Learning & Teaching Activities
Learning & Teaching Modes
Course material is delivered through lectures, which are supported each week by problem-solving tutorials and lab classes. The regular lab classes provide hands on experience with the material learnt in the lectures. The problem-solving tutorials give students a chance to try and solve mathematical fracture mechanics problems from each topic.
The information below is provided as a guide to assist students in engaging appropriately with the course requirements.
Fracture Mechanics is a challenging subject containing a series of new concepts, theories and solution methods, which are linked like a chain. Since the subject is concept and theory intensive, the most effective way to understand the new concepts and theories is to attend the lectures and tutorials. During a lecture you can have instant interactions with the lecturer, by asking questions and thinking about questions raised by others. It is always a good idea to read the lecture notes before attending a lecture, for just a few minutes, to make sure that you know roughly the material to be covered in the lecture.
Lectures, tutorials, and lab classes comprise of 4 hours contact time per week. The total amount of time needed each week by the student to revise lecture notes and complete the assignments/reports will vary greatly from student to student. As a rough guide, the average standard undergraduate course weekly workload for a 3 unit course is 12 hours, including contact time.
Learning Activities Summary
The course structure is as follows:INTRODUCTION AND REVIEW(a) What and Why Fracture Mechanics(b) Goals of Fracture Mechanics(c) Brief historical overview
BASIC CONCEPTS OF SOLID MECHANICS(a) Review of the basic concept of the Solid Mechanics(b) Basic solutions of the Theory of Elasticity(c) An overview of the Theory of Plasticity
LINEAR ELASTIC FRACTURE MECHANICS (LEFM)(a) Stress near the crack tip(b) Fracture initiation criterion(c) Stress intensity factor
(d) Intro to LEFM in design
ENERGY PRINCIPLES IN FRACTURE MECHANICS(a) Fracture at the atomic scale(b) Griffith energy balance(c) Strain energy release rate
(d) Fracture analysis based on compliance
SOLUTIONS AND METHODS FOR CALCULATING STRESS INTENSITY FACTOR(a) Analytical methods(b) Numerical methods
ELASTIC-PLASTIC FRACTURE MECHANICS(a) Small-scale yielding approximation(b) Thickness effect of fracture toughness(c) Intro to Failure Assessment Diagram (FAD)FATIGUE
(d) J-Integral(a) Stages of fatigue(b) Total life approaches(c) Fatigue crack propagation
(d) Factors influencing fatigue crack growth
(e) Plasticity effects on fatigue
DYNAMIC FRACTURE(a) Stability and the R-curve(b) Rapid crack propagation(c) High strain rate initiation(c) Creep and Viscoelastic crack growth
MECHANISMS OF FRACTURE & FATIGUE(a) Fracture mechanisms in metals(b) Fatigue mechanisms in metals(c) Fracture in non-metalsEXPERIMENTAL METHODS IN FRACTURE AND FATIGUE
(a) Standard fracture specimens(b) Test methods and testing standards(c) Dynamic fracture testingINTRODUCTION TO FAILURE ANALYSIS
(d) Experimental methods to determine K(a) Purpose of failure analysis(b) Causes of failure(c) Carrying out failure investigationsFRACTURE MECHANICS IN DESIGN(a) Fail-safe approach design approach(b) Safe-life design approach(c) Damage tolerance conceptDAMAGE DETECTION & NON-DESTRUCTIVE EVALUATION(a) Why non-destructive evaluation?(b) Methods for non-destructive evaluation(c) Applications and current research
CATCH-UP AND REVISION
Specific Course Requirements
There are no course specific requirements
The University's policy on Assessment for Coursework Programs is based on the following four principles:
- Assessment must encourage and reinforce learning.
- Assessment must enable robust and fair judgements about student performance.
- Assessment practices must be fair and equitable to students and give them the opportunity to demonstrate what they have learned.
- Assessment must maintain academic standards.
The following is an outline of the assessment for this course. Feedback on all assessments, except the final exam, will be provided to students to aid in their progress and learning. Please note that while every effort has been made to ensure that this information reflects an accurate plan, the coordinator reserves the right to make changes that ensure the continual improvement of the course. Any such changes will be made clear during the lectures and via MyUni.
Component Weighting In-class tutorials 10% Assignments 13.4% Project 8% Lab classes 8.6% Final Exam 60%
Assessment Related Requirements
The assessment tasks listed above, with the exception of the final exam, are not compulsory and have no minimum grade requirements. However, all assessment tasks are included in the calculation of the final course grade. It should be noted that students choosing not to complete an assessment task will receive no feedback on that task or stage of the course and will severely hinder their learning.
Assignments and in-class tutorials are provided as part of the learning experience. Students are expected to enhance their knowledge, problem solving skills and understanding of the subject matter through completing the assignments and quizzes. The assignments and tutorials are marked, with the mark contributing to the final grade for the subject.
The case study, fracture prediction project and lab classes allow students to consolidate and apply all of the material they have covered in the course. These assessments focus on the ability of the students to analyse a practical problem based on what they have learned in the course.
The examination is a summative assessment and is intended to assess the students’ knowledge and understanding of the course material and how it fits into the global engineering context. The exam is open-book.
Submission of assignments and reports is through hardcopies via the submission boxes located on level 2 of Engineering South Building Assignment submission area. Please ensure a cover sheet is attached to all submissions.
Grades for your performance in this course will be awarded in accordance with the following scheme:
M10 (Coursework Mark Scheme) Grade Mark Description FNS Fail No Submission F 1-49 Fail P 50-64 Pass C 65-74 Credit D 75-84 Distinction HD 85-100 High Distinction CN Continuing NFE No Formal Examination RP Result Pending
Further details of the grades/results can be obtained from Examinations.
Grade Descriptors are available which provide a general guide to the standard of work that is expected at each grade level. More information at Assessment for Coursework Programs.
Final results for this course will be made available through Access Adelaide.
The University places a high priority on approaches to learning and teaching that enhance the student experience. Feedback is sought from students in a variety of ways including on-going engagement with staff, the use of online discussion boards and the use of Student Experience of Learning and Teaching (SELT) surveys as well as GOS surveys and Program reviews.
SELTs are an important source of information to inform individual teaching practice, decisions about teaching duties, and course and program curriculum design. They enable the University to assess how effectively its learning environments and teaching practices facilitate student engagement and learning outcomes. Under the current SELT Policy (http://www.adelaide.edu.au/policies/101/) course SELTs are mandated and must be conducted at the conclusion of each term/semester/trimester for every course offering. Feedback on issues raised through course SELT surveys is made available to enrolled students through various resources (e.g. MyUni). In addition aggregated course SELT data is available.
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