SFTY 335 Week 3 Discussion 1 | Assignment Help | ERAU
- embry-riddle-aeronautical-university / SFTY 335
- 10 Jan 2020
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SFTY 335 Week 3 Discussion 1 | Assignment Help | ERAU
After reviewing the module presentation and
materials, complete the following activity.
You will also need to view the SFTY 335
Tensile Test (8:28) video.
Please note the following correction
for the video: Dr. Solti meant to say there are 2.54 centimeters per inch, or
25.4 millimeters per inch.
When completing the exercise problems, be sure to show all of
your work so the instructor can see where you may have made a mistake. If there
are minor mistakes, you will receive partial credit for the question. For
major mistakes that result in a wrong answer, you will receive a zero for
the question.
You can either show your solution to the problems using Word and
an application like MathType or handwrite your solutions and scan/take a photo
of the results with a smartphone or tablet and submit as a jpeg or PDF.
Please review the MathType and Equation Editor
Information page located in the Course Specific Information module area.
Save your assignment using a naming convention that includes
your first and last name and the activity number. Do not add punctuation or
special characters. Be sure to include your name in your document and
files. This assignment is due by the end of the module week.
Exercise
Complete the following:
1. Research
and select a metal alloy, a ceramic and a composite material used in the
aviation industry. Compare and contrast the expected Tensile Test response of
the materials if you were to conduct such experiments. Include stress-strain
sketches for each material. Label relevant properties (e.g. yield strength).
2. Given
the metal alloy you selected for question 1, estimate the required diameter of
an F-35 landing gear strut under pure axial loading if we are to achieve a
Factor of Safety of 2.0 on a “hard landing.” Assume the strut has a solid circular
cross-section (unlike the hollow cross-section in the module presentation).
Assume a solid cross-section simplifies the “cross-sectional area” equation to
A=πr2. Assume the same “hard landing axial force” of
90,000 lbs, as in the presentation. Assume the strut experience only pure
compressive loading, i.e. Normal Stress = Force/Area.
3. Explain
the cost-benefit relationship between metal alloys, ceramics and composites as
they relate to aviation safety.
4. Important: In
order to answer this question, you’ll need to watch the SFTY 335 Tensile Test
video at the beginning of this page.
A. During
the Tensile Test at the Materials Testing Lab at the ERAU Daytona Beach campus,
Dr. Solti may have switched the test specimen to
something other than 6061-T6 Aluminum – or maybe he didn’t. Your task is to
determine if he did by identifying the material used based upon the video test
results.
B. The
specimen diameter was measured and determined to be 0.35 inches. Hints: 1
Newton = 0.2248 pounds. The test specimen came from one of the four bins
identified in the image below at the end of the activity.
1. Bin
1: Al-6061-T651
2. Bin
2: Al-2024-7351
3. Bin
3: Al-7075-T651
4. Bin
4: Steel C1018
C. Write
a concise technical memo justifying your findings.
Include all calculations. No particular format is required; however, note that
half of the points for this question will be based upon your ability to
professionally and logically communicate your technical findings. The other
half will be based upon the accuracy of your calculations. Assume the following
material properties:
|
Material |
Ultimate Tensile Strength |
|
2024-T3
Aluminum |
70,000
psi |
|
6061-T6
Aluminum |
42,000
psi |
|
7075-T6
Aluminum |
75,000
psi |
|
C1018
Steel |
64,000
psi |
|
4340
Steel |
176,000
psi |
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