MECH ENG 2002 - Stress Analysis & Design

North Terrace Campus - Semester 2 - 2014

Concept of stress and strain, characterisation of stress-strain curves and failure of metals, plastics and wood, Hooke's law in tension/compression and shear, axially loaded members, Saint-Venant's principle, non-linear deformation, statically indeterminate structures, thermal stresses, torsion of circular bars and tubes, bending, stresses in beams, combined loading, deflection of beams, buckling instability, analysis of stress and strain, Mohr's circle, generalized Hooke's law, strain energy, energy methods, elementary theories of plasticity and failure, intro to design of columns, shafts, pressure vessels, welded joints, fasteners and springs and Finite Element Analysis.

  • General Course Information
    Course Details
    Course Code MECH ENG 2002
    Course Stress Analysis & Design
    Coordinating Unit School of Mechanical Engineering
    Term Semester 2
    Level Undergraduate
    Location/s North Terrace Campus
    Units 3
    Contact Up to 5 hours per week
    Assumed Knowledge MECH ENG 1007 & C&ENVENG 1010
    Restrictions Available to BE(Mechanical & Aerospace), BE(Mechanical & Automotive), BE(Computational), BE(Mechanical), BE(Mechatronic), BE(Mechanical & Sports), BE(Mechanical & Sustainable Energy) and associated double and combined degree students only
    Course Description Concept of stress and strain, characterisation of stress-strain curves and failure of metals, plastics and wood, Hooke's law in tension/compression and shear, axially loaded members, Saint-Venant's principle, non-linear deformation, statically indeterminate structures, thermal stresses, torsion of circular bars and tubes, bending, stresses in beams, combined loading, deflection of beams, buckling instability, analysis of stress and strain, Mohr's circle, generalized Hooke's law, strain energy, energy methods, elementary theories of plasticity and failure, intro to design of columns, shafts, pressure vessels, welded joints, fasteners and springs and Finite Element Analysis.
    Course Staff

    Course Coordinator: Dr Erwin Gamboa

    Course Timetable

    The full timetable of all activities for this course can be accessed from Course Planner.

    One two-hour lecture and a three hour tutorial per week. Three laboratories will need to be attended through the semester.

  • Learning Outcomes
    Course Learning Outcomes

    The primary goal of the course is to provide students with the skills and knowledge required to analyse stress, strain and failure in machine parts and to use simple design procedure to ensure adequate strength of mechanical components. On completion of the course, students should:

    • Be proficient with fundamental principles in stress analysis and basics of design for strength;
    • Have been exposed to understanding of real life failures of various mechanical machinery components;
    • Have developed an understanding of the appropriate selection of materials relating to design for strength against failures;
    • Be gaining the physical intuition necessary to idealize a complicated practical problem and have developed appreciation of the importance of appropriate but simple assumptions used in basic stress analysis calculations;
    • Have an understanding of the responsibility of engineers for safe design of engineering structures and unfortunate consequences of failures, and loss of human lives.
    1 Ability to apply knowledge of basic science and engineering fundamentals;
    2 Ability to communicate effectively, not only with engineers but also with the community at large;
    3 In-depth technical competence in at least one engineering discipline;
    4 Ability to undertake problem identification, formulation and solution;
    5 Ability to utilise a systems approach to design and operational performance;
    6 Ability to function effectively as an individual and in multi-disciplinary and multi-cultural teams, with the capacity to be a leader or manager as well as an effective team member;
    7 Understanding of the professional and ethical responsibilities and commitment to them;
    8 Expectation of the need to undertake lifelong learning, and the capacity to do so.
    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. 1,3-7
    The ability to locate, analyse, evaluate and synthesise information from a wide variety of sources in a planned and timely manner. 4,5
    An ability to apply effective, creative and innovative solutions, both independently and cooperatively, to current and future problems. 1-7
    Skills of a high order in interpersonal understanding, teamwork and communication. 1-7
    A proficiency in the appropriate use of contemporary technologies. 1-7
    A commitment to continuous learning and the capacity to maintain intellectual curiosity throughout life. 8
    A commitment to the highest standards of professional endeavour and the ability to take a leadership role in the community. 1-7
    An awareness of ethical, social and cultural issues within a global context and their importance in the exercise of professional skills and responsibilities. 2,6,7
  • Learning Resources
    Required Resources

    No text book is compulsory –notes are provided

    Recommended Resources
    • Gere, J.M., Mechanics of Materials, Seventh edition, Cengage Learning, 2009.

    • Beer, Johnston, DeWolf, Mazurek, Mechanics of Materials, McGraw Hill 2009

    • Hibbeler, R.C., Mechanics of Materials, SI edition, Prentice-Hall, Inc. 2011.

    • Benham, P.P., Crawford, R.J. and Armstrong, C.G. Mechanics of Engineering Materials, Second edition, Prentice-Hall, Inc. 1996.

    • Shigley, J.E. and Mischke, C.R., Mechanical Engineering Design, Sixth metric edition, McGraw-Hill, 2002.

    Online Learning

    Further material will be available through MyUni under the “Course Material” section for this subject.

  • Learning & Teaching Activities
    Learning & Teaching Modes

    Assignments and in-class quizzes 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, so they are regarded as formative rather than summative. The assignments and quizzes are marked, with the mark contributing to the final grade for the subject to ensure that students actually do the assignments and quizzes and take them seriously. It also helps to assess whether the required graduate attributes are being developed.

    The laboratory class is intended to provide students with some practical experience in using experimental techniques and the Finite Element Method as well as experience in report writing and communicating their results.

    The examination is a summative assessment and is intended to assess the student’s knowledge and understanding of the course material and how it fits into the global engineering context.

    Workload

    The information below is provided as a guide to assist students in engaging appropriately with the course requirements.

    Every week there will be a tutorial given out at the beginning of the session to be completed during that session. It is very difficult to complete the tutorial within the allotted time if students have not prepared for the session. The best preparation is to attempt questions out of any of the suggested textbooks in the subject area prior to the tutorial. An hour’s preparation in this manner is recommended before each tutorial.

    One assignment will be given at the beginning of the year, and it is expected to require approximately fifteen hours of work.

    Learning Activities Summary

    INTRODUCTION (2%)

    (a) Course organization and policies
    (b) Overview of the objectives and methods of Stress Analysis and Design
    (c) Review of concepts from introductory static and dynamics courses
    (d) Brief historical retrospective


    TENSION, COMPRESSION AND SHEAR (8%)

    (a) Normal stress and strain
    (b) Shear strain and strain
    (c) Strain energy
    (d) Material properties of materials
    (e) Hooke's Law, Young's Modulus and Poisson's ratio


    ANALYSIS AND DESIGN OF SIMPLE STRUCTURES (8%)

    (a) Bearing stress
    (b) Factor of safety
    (c) Allowable stresses
    (d) Design of simple connections, joints and structures


    AXIALLY LOADED MEMBERS (8%)

    (a) Changes in length of axially loaded members
    (b) Non-linear behavior
    (c) Statically indeterminate structures
    (d) Thermal effects
    (e) Stress concentration
    (f) Saint-Venant’s principle
    (g) Principle of Superposition



    TORSION OF CIRCULAR BARS (8%)

    (a) Torsional deformation of a solid circular bar
    (b) Circular tubes
    (c) Stress and strain in pure shear
    (d) Nonuniform torsion and statically indeterminate shafts


    BENDING (10%)

    (a) Shear force and bending moment diagrams
    (b) Flexure formulae
    (c) Shear formulae
    (d) Examples


    GEOMETRIC PROPERTIES OF AN AREA (5%)

    (a) Centroid and the first moment for composite areas
    (b) Moment of inertia for composite areas
    (c) Parallel-axis theorem


    COMBINED LOADING (5%)

    (a) Principle of superposition
    (b) Procedure for analysis
    (c) Springs
    (d) Examples


    DEFLECTION OF BEAMS AND SHAFTS (5%)

    (a) Principle of superposition
    (b) Procedure for analysis
    (c) Springs
    (d) Examples


    BUCKLING INSTABILITY (5%)

    (a) Euler formulae
    (b) Effective-length factor
    (c) Secant formula
    (d) Design of practical columns


    ANALYSIS OF STRESS (10%)

    (a) Plane stress state
    (b) Stress transformation equations for plane stress
    (c) Mohr’s circle
    (d) Principle and maximum shear stress


    GENERALIZED HOOKE’S LAW AND STRAIN ENERGY (8%)

    (a) Generalized Hooke’s law
    (b) Volume changes
    (c) Strain energy and energy methods
    (d) Intro to Finite Element techniques


    THEORIES OF FAILURE AND PLASTICITY (8%)

    (a) Maximum shear stress theory
    (b) Maximum distortion energy theory
    (c) Maximum normal stress theory 
    (d) Failure under cycling loading
    (e) Failure at elevated temperatures, creep


    SHAFT DESIGN (5%)

    (a) Intro to shaft design
    (b) Examples


    PRESSURE VESSELS (5%)

    (a) Stresses in spherical and cylindrical pressure vessels
    (b) Examples
    (c) Intro to pressure vessel design and AS1210 Code for unfired pressure vessels

  • Assessment

    The University's policy on Assessment for Coursework Programs is based on the following four principles:

    1. Assessment must encourage and reinforce learning.
    2. Assessment must enable robust and fair judgements about student performance.
    3. Assessment practices must be fair and equitable to students and give them the opportunity to demonstrate what they have learned.
    4. Assessment must maintain academic standards.

    Assessment Summary

    No information currently available.

    Assessment Related Requirements

    Attendance at laboratories is compulsory. If the total mark for laboratories is less than 30% for that section, the student will automatically fail the subject.

    Assessment Detail

    Assignments will be marked for clarity, proper referencing, interpretation and justification of results. Justification and explanation of thought process can be as important as the final numerical answer given.

    Submission

    Submissions are to be handed in to the submission box on level 2 of Engineering South Building with a signed cover page. Submissions not having a cover page will not be marked.

    It is strongly recommended that an electronic submission is also submitted to the “Digital dropbox” within MyUni. This ensures that they are timestamped and that there is a backup copy submitted in case there are problems later with the paper copy.

    • Electronic submission file MUST be named in the format of “s(student number) Asst 1”. If you submit a file with a different filename, it will not be marked.
    • An easy way to compile the assignment is to scan handwritten calculations and diagrams, and then to insert them into the main document.
    • Your submission needs to include all appendices, etc within the file. Separate files will not be marked.

    Any late submission will be marked at -10% penalty per calendar day late.

    Marked assignments and quizzes will be returned in the “submission return” pigeonholes in the second floor of Engineering South (beside the elevator).

    Students are encouraged to contact the lecturer as soon as possible if there is a problem with handing in assignments/quizzes so as to request a different deadline.

    Course Grading

    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.

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    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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