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Unformatted text preview: Material Density, r , Modulus, E, CTE, a , Price , p, Tensile Strength, (Mg/m 3 ) (GPa) x 10-6 K-1 ($/Mg) s f , (MPa) Mild Steel 7.9 203 12 300 220 Aluminum alloy (2000 series) 2.8 71 24 1500 350 Titanium alloy Ti-6Al4V 4.5 120 9.0 8000 850 Carbon fiber composite* 1.5 70 3.0 100000 700 Wood (e.g spruce)* 0.6 12 4.0 300 30 Silicon Carbide (SiC) 3.0 410 4.0 50000 300 Note. Although the design objective is to minimize the mass of the structure, the credit for the question will be based on demonstrating a logical approach to selecting a material and a truss configuration, and then obtaining an estimate for the mass of the truss. Do not spend more than an hour on this question, and do not analyze multiple truss configurations. A useful exercise is to estimate what you think the mass of the truss will be before you do any analysis - developing an intuition for the correct size for structures is a useful skill to cultivate. 2...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.
- Fall '05