Machine Design Part I

Go to Course: https://www.coursera.org/learn/machine-design1

Introduction

# Course Review: Machine Design Part I on Coursera ## Overview “Machine Design Part I” is the first installment of an enlightening three-course series dedicated to the essential aspects of mechanical design. Offered on Coursera, this course lays the foundation for understanding critical topics such as static and fatigue failure theories, shaft analysis, fastener mechanics, gear design, and the intricacies of mechanical systems like gearboxes. The course not only presents theoretical concepts but also contextualizes them through real-life case studies, including the fascinating material selection processes for a total hip implant. With a comprehensive syllabus structured over five weeks, this course caters to engineering students, professionals looking to brush up on their design skills, and enthusiasts eager to delve into the mechanics of machine design. ## Detailed Syllabus Breakdown ### Week 1: Material Properties in Design The course kickstarts by exploring the essential properties of materials that are pivotal in design. You will be introduced to critical concepts such as strength, modulus of elasticity, and the coefficient of thermal expansion. Utilizing a real-life case study on a Zimmer orthopedic hip implant, the course showcases how these properties influence practical design choices. To reinforce this knowledge, the week concludes with a quiz assessing your grasp of material properties. ### Week 2: Static Failure Theories - Part I This week dives into the mechanics of stress, strength, and safety factors, where you will review fundamental concepts from previous coursework, including axial and shear stresses. While no quiz is scheduled this week, students are encouraged to engage with practical worksheets to strengthen their analytical skills, setting a solid groundwork for more advanced theories. ### Week 3: Static Failure Theories - Part II Building upon the previous week's foundation, learners will explore the ductile to brittle transition and delve into critical failure theories, including the Distortion Energy Theory and Brittle Coulomb-Mohr Theory. A captivating case study featuring the ultimate load testing of the Boeing 777 underlines the significance of rigorous analysis and validation. A quiz will evaluate your understanding at the end of the week. ### Week 4: Fatigue Failure - Part I As the course progresses, participants will venture into the domain of fatigue, starting with key principles, including the SN Curve and its applications. The week emphasizes the critical nature of fatigue through a compelling case study on the Aloha Airlines flight 293 incident. Engaging worksheets and a quiz will help solidify your comprehension of how fatigue can compromise design integrity. ### Week 5: Fatigue Failure - Part II In the concluding week, the course encapsulates fatigue failure criteria for fluctuating and randomly varying stresses, introducing concepts such as the Modified Goodman line and Miner’s Rule. Students will reinforce their learning with final worksheets and a comprehensive quiz that encapsulates the essentials covered throughout the course. ## Review and Recommendation “Machine Design Part I” impresses with its structured approach, which is both informative and engaging. The course content is rich with practical applications and real-world case studies, making complex theoretical concepts accessible. The instructors’ expertise shines through, and their professional background adds significant value to the learning experience. For those pursuing a career in mechanical engineering or looking to enhance their understanding of machine design principles, this course is highly recommended. It lays a strong groundwork for further studies in mechanical design while providing insights into critical design considerations that can influence real-world applications. The interactive format—complete with quizzes and worksheets—ensures that learners can both assess their understanding and solidify their knowledge through practice. In summary, if you seek a robust introduction to machine design that interweaves theory with practical application, “Machine Design Part I” on Coursera is a course worth your time and investment.

Syllabus

Material Properties in Design

In this week, we will first provide an overview on the course's content, targeted audiences, the instructor's professional background, and tips to succeed in this course. Then we will cover critical material properties in design, such as strength, modulus of elasticity, and the coefficient of thermal expansion. A case study examining material selection in a Zimmer orthopedic hip implant will demonstrate the real life design applications of these material properties. At the end of the week you will have the opportunity to check your own knowledge of these fundamental material properties by taking Quiz 1 "Material Properties in Design."

In week 2, we will review stress, strength, and the factory of safety. Specifically, we will review axial, torsional, bending, and transverse shear stresses. Please note that these modules are intended for review- students should already be familiar with these topics from their previous solid mechanics, mechanics of materials, or deformable bodies course. For each topic this week, be sure to refresh your analysis skills by working through worksheets 2, 3, 4 and 5. There is no quiz for this week.

In this week we will first cover the ductile to brittle transition temperature and stress concentration factors. Then, we will learn two critical static failure theories; the Distortion Energy Theory and Brittle Coulomb-Mohr Theory. A case study featuring the ultimate load testing of the Boeing 777 will highlight the importance of analysis and validation. Be sure to work through worksheets 6, 7, 8 and 9 to self-check your understanding of the course materials. At the end of this week, you will take Quiz 2 “Static Failure.”

In week 4, we will introduce critical fatigue principles, starting with fully revisable stresses and the SN Curve. Then, we discuss how to estimate a fully adjusted endurance limit. Finally, a case study covering the root cause analysis of the fatigue failure of the Aloha Airlines flight 293 will emphasize the dangers of fatigue failure. In this week, you should complete worksheets 10, 11 and 12 as well as Quiz 3 “Fully Reversed Loading in Fatigue.”

In this last week of the course, we will cover the fatigue failure criteria for fluctuating and randomly varying stresses, including key concepts such as the Modified Goodman line and Miner’s Rule. This week be sure to complete worksheets 13 and 14 as well as Quiz 4 “Fluctuating Fatigue and Miner’s Rule.” Finally, take Quiz 5, “The Comprehensive Quiz”, which will measure your overall knowledge of this course.