20 1. INTRODUCTION TO RELIABILITY IN MECHANICAL DESIGN
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1.10 EXERCISES
1.1. List at least two different definitions of engineering design and discuss their similarities
and differences.
1.2. Use your statement to explain what engineering design is.
1.3. What is the five-phase engineering design? What are the main tasks of each phase?
1.10. EXERCISES 21
1.4. Use one of your design projects to check whether you used all five phases. If not, why
or what happened?
1.5. Why is the engineering design a process?
1.6. List at least two possible needs for engineering design and then run the needs assess-
ment.
1.7. Use one of your design examples to describe how you conduct a conceptual design.
1.8. List four examples of failures that you know. What are the types of failures? What causes
failures?
1.9. Describe and explain your understanding of a typical bathtub curve of the failure rate.
1.10. What is a static strength failure?
1.11. What is fatigue failure? Explain the differences between static failure and fatigue failure.
1.12. List one example of excessive deflection failure and provide some possible solutions to
deal with the issue.
1.13. What is uncertainty in engineering? List and explain at least three examples of typical
design parameters.
1.14. What causes the uncertainty of the ultimate tensile strength of a material?
1.15. Explain the uncertainty related to geometrical dimensions of components.
1.16. Use one example to describe and explain uncertainty related to component failures.
1.17. What is the factor of safety? What is the physical meaning of the factor of safety? Can
you use the factor of safety to predict the component failure? Why?
1.18. List and explain the definition of reliability in engineering design.
1.19. What are the similarities and differences between the factor of safety and reliability?
1.20. What is the reliability-based mechanical design? What are the key differences between
the traditional mechanical design theory and reliability-based mechanical design?
1.21. Does a component with a higher factor of safety imply that the component will have
higher reliability? If not, can you explain it?
1.22. Describe and explain the importance of reliability in engineering design.
1.23. Briefly describe the reliability history. What do you learn from this history?
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