T01.1 Overview

T01.1 Overview - 9/1/2010 When an engineer designs...

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9/1/2010 1 Welcome to EGR 75L Mechanics of Solids Joseph Nadeau, PhD, PE, M.ASCE 173 Hudson Hall Annex nadeau@duke.edu T01.1 When an engineer designs something what are the governing principles? • Design serves intended purpose • Economy – Use material efficiently • Safety/reliability – max stress < allow stress = (failure stress)/FS • “Serviceability” – Deflections, rotations Energy Æ System Æ Response
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9/1/2010 2 Energy (Stimuli/Forces) • Accelerations –G rav i ty – Impact – Earthquake • Pressure –A i r – Water • Environmental changes – Temperature – Humidity David Parsons Sami Sarkis System • Shape – Cross-section •S i z e – Length – Cross-section dimensions • Material Properties – Young’s modulus, E – Shear modulus, G – Density – Thermal expansion, • Boundary conditions –P i n – Roller –F i x
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T01.1 Overview - 9/1/2010 When an engineer designs...

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