MIT16_982s09_lec03

MIT16_982s09_lec03 - MIT OpenCourseWare http/ocw.mit.edu 16.982 Bio-Inspired Structures Spring 2009 For information about citing these materials or

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 16.982 Bio-Inspired Structures Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . How strong is it? Under what sort of deformation? l l A A l l F F θ F F F F F T T A φ A C D B Tension Compression Torsion Shear Figure by MIT OpenCourseWare. Basic mechanical behavior Basic mechanical behavior of material Specimen Specimen is “pulled” in is pulled in tension at a constant rate Load ( F ) Load ( F ) necessary to necessary to produce a given elongation ( ∆ L ) is is monitored monitored Load vs elongation curve Converted to stress-strain Converted to stress-strain curve • • • • • 2" 2 1" 4 Gauge length Radius Diameter Reduced section 0.505" Diameter 3" 8 3" 4 Load cell Extensometer Specimen Moving crosshead Figure by MIT OpenCourseWare. Figure by MIT OpenCourseWare. Engineering Stress, σ F F A where F is the applied load and A is the original where F is the applied load and A is the original cross-sectional area. Units: N/m 2 or lb/in 2 E i i S t i Engineering Strain, ε L i L L L L where i t t L is the original length and U itl L i is the instantaneous. Unitless. Figure by MIT OpenCourseWare. 2" 2 1" 4 Gauge length Radius Diameter Reduced section 0.505" Diameter 3" 8 3" 4 2" 2 1" 4 Gauge length Radius Diameter Reduced section 0.505" Diameter 3" 8 3" 4 Figure by MIT OpenCourseWare. Classification of the material the material (Maximum) Tensile Strength Fracture Ductile Brittle Stress Strain A C C' B' B Figure by MIT OpenCourseWare....
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This note was uploaded on 11/08/2011 for the course AERO 16.851 taught by Professor Ldavidmiller during the Fall '03 term at MIT.

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MIT16_982s09_lec03 - MIT OpenCourseWare http/ocw.mit.edu 16.982 Bio-Inspired Structures Spring 2009 For information about citing these materials or

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