Module 2 - Failure Prevention
Chapter 5: Static Failure Theories
Chapter 5 Overview
Chapter 5 covers the following key concepts:
- Examination of failure modes under static loading conditions.
- Introduction to common failure criteria, including Maximum Normal Stress, Maximum Shear Stress, and Distortion Energy theories.
- Application of static failure theories in the design of safe and reliable machine components.
Lecture 5: Introduction to Failure Prevention
We will begin delving into the critical aspects of failure analysis in mechanical engineering today. The following will help you prepare for this discussion:
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Read
- Sections 5.3-5.7 of Shigley's Mechanical Engineering Design to review fundamental concepts from mechanics of materials and begin reading about failure theories.
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Watch
- Tensile Test on ASME Welded Sample (#FridayFails): Notice how the specimen yields by "necking down" before failure.
- Why Concrete Needs Reinforcement: Learn about why concrete is often reinforced using rebar.
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Practice
- Problems 5-51 and 5-60 from Shigley's Mechanical Engineering Design, and then review the solutions posted. - Module 2 Homework Problems
Lecture 5 Notes
- Lecture 5 Notes[pdf]
Lecture 6: Static Failure Theories for Ductile Materials
We will look at failure theories for ductile materials, including the maximum shear stress (MSS), Distortion Energy (DE), Ductile Coulomb-Mohr (DCM) theories.
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Read
- Section 5.3-5.7 of Shigley's Mechanical Engineering Design to read about failure theories for ductile materials.
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Practice
- Try taking Practice In-Class Quiz 2, to prepare for the next in-class quiz.
- After you're done, see how you did by comparing your answers to the Practice In-Class Quiz 2 Solution
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Complete
- Lecture 6 Quiz: due Tuesday, January 28 at 11:59 PM.
Lecture 6 Notes
- Lecture 6 Notes[pdf]
Lecture 7: Static Failure Theories for Brittle Materials
We will look at failure theories for brittle materials, including the maximum normal stress (MSS), Modified Mohr (MM), and Brittle Coulomb-Mohr (BCM) theories.
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Read
- Sections 5.8-5.11 of Shigley's Mechanical Engineering Design to read about static failure theories for brittle materials.
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Complete
- Lecture 7 Quiz: due Thursday, January 30 at 11:59 PM.
Lecture 7 Notes
- Lecture 7 Notes[pdf]
Lecture 8: In-Class Quiz #2
We will have In-Class Quiz #2 today, and our first exam on Tuesday, February 4. Here’s how you can best prepare:
- Review the Exam 1 Information page - It contains all the details you need to know for exam day.
- Familiarize yourself with the Exam 1 Equation Sheet - This will be provided with the exam (you cannot bring your own).
- Flip through the Exam 1 Review Slides - These cover all exam topics and include extra practice problems.
- Take the Practice Exam 1 under test conditions - Use only the Exam 1 Equation Sheet, your crib sheet, and a calculator.
- Check your answers with the Practice Exam 1 Solution to see where you need to improve.
- Use past quizzes to study - The exam will include both multiple-choice and problem-solving questions similar to Lecture Quizzes and In-Class Quizzes. Make the most of your study time, and let me know if you have any questions!