SFTY335 Embry Riddle Aeronautical Axial and Bending Failure Mode Discussion

SFTY335 Embry Riddle Aeronautical Axial and Bending Failure Mode Discussion

Part 1. Compare and contrast axial and bending failure modes. Devise and conduct an experiment that would provide a good demonstration to a group of high-school students illustrating the difference between the failure modes. Create a talking paper that is no more than 3 minutes in length to answer the question.

Part 2.

1. Product Design.
   1. Choose a product currently available for sale on the open market – one that clearly required some sort of engineering design effort, e.g. Ford F-150, Gulfstream G650, iPhone, Sonos One, BEIOU Carbon Fiber Mountain Bike. Speculate and discuss, using good engineering judgement and the principles you learned about in this course, a few design considerations and tradeoffs that likely went into the development of the product.
   2. What do you believe is a reasonable Factor of Safety for your product? Defend your answer.
   3. Discuss why both a F.S. below 1.0 and a F.S. above 8.0 may be poorly designed products.
2. Explain why the concept of “mechanical stress” is important to the airworthiness and aviation safety community. Provide a relevant example you are personally aware of (even if it’s outside the aviation field).
3. In your own words, discuss the concept of Superposition of Stresses and why it’s important to consider in aircraft design.
4. Assume a critical aircraft component made of 7075-T6 aluminum is subject to an applied stress of 70,000 psi during a flight. What advice would you have for the maintenance crew once the aircraft is on the ground? Justify your answer. Hint: research both the yield strength and ultimate strength of the given aluminum alloy.
5. Take pictures of three objects near your home that are subject to complex loading. Briefly discuss some of the design considerations that likely went into them. Include “educated guesses” on what materials were likely used, why they were selected, tradeoffs (cost, weight, fracture toughness, etc.), as well as on the structural design itself (size, shape, assembly).

   Example: As wind blows on the road sign pictured, the support pole twists. In addition, the weight of the cross brace and road signs cause the pole to bend and compress. The base of the pole (near the ground) is likely the location of maximum stress (subject to axial, bending and torsional loads). In designing the support pole, we need to consider …