Warnick James Module1Questions with Answers-Student.docx

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SFTY 335 – Module 1 Questions 1. An aircraft weights 120,000 lbs., it has 35,000 lbs. of fuel added. What will be its takeoff weight? If there is 350 lbs. of excess weight what will be its new weight? Hint 1 kg = 2.21 lbs. Gravity = 9.81 N/m 2 . (up to 5 points) 2. Why is the fracture value less than the UTS value shown on a stress-strain graph? (up to 5 points) The fracture value takes into account the changed cross-sectional area of the material after necking. 3. Use the table below that gives the yield point for three materials. What applied load would there be at yield for each when the area is a diameter of 20 mm? Yield is in MPa. (up to 30 points) Materials Yield MPa Aluminum 240 Steel 600 Steel – hardened 950 Hint, 20mm = 0.02m and Yield = load/cross sectional area. Yield MPa= applied load/area, yield MPa x area= applied load. A diameter of 20mm gives an area of 314.159mm, or .314 m (via πr^2). Aluminum load- 75.36N Steel load- 188.4N Steel- hardened load- 298.35N. 4. A material has an E value is 200 GPa, what is the strain, if the stress is 120MPa? Hint E = stress/strain and think about the units.
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