Lecture-4

Lecture-4 - An example problem to demonstrate the process...

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Unformatted text preview: An example problem to demonstrate the process • Draw idealization – establish the boundary constraints • Draw FBD with external reactions – is the truss determinate or indeterminate? • Now what do I do? – What are you looking for? – What’s the cheapest way to get it? AAE 352 P A B C 20 in. h R 2 P R 3 R 1 A B C • Read notes Section 2.10, 2.11 • Look at problems on p. 47. Can you work problems 2-1 and 2-3? Try them. – They will not be handed in. AAE 352 AAE 352 AAE 352 – Estimating weight • Failure criteria • Limit load • Factor of safety • Ultimate load • Allowable stress • Material index • Strain energy Aeronautical engineering began with Wilbur and Orville • "I am constructing my machine to sustain about five times my weight and am testing every piece." – Wilbur Wright, 1900 • "We hung the machine on tips to test strength…” Orville Wright diary, November 1903 • “We also hung it by the tips and ran the engine screws with the man also on board. The strength of the machine seems 'OK'." Wilbur Wright, December 2, 1903 • 1903 Flyer airframe weight was 405 lb. - engine weighed about 200 lb. complete with radiator, water, fuel and accessories....
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This note was uploaded on 01/18/2012 for the course AAE 352 taught by Professor Chen during the Fall '08 term at Purdue.

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Lecture-4 - An example problem to demonstrate the process...

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