3_stress_and_strain_09

3_stress_and_strain_09 - Notes 1160 Stress and Strain 1 The...

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Unformatted text preview: Notes 1160: Stress and Strain 1 The Invention of Stress and Strain • Augustin Cauchy in 1822 “invented” the ideas of stress and strain. • stresses <===> forces • strains <===> displacements Augustin Cauchy 1789-1857 Notes 1160: Stress and Strain 2 Bricks and Strings Revisited • Weight of brick puts force in the string ===> causes string to stretch m stretch F Notes 1160: Stress and Strain 3 Stress • Measure of how much force is being used to pull the atoms in a solid apart or push them closer together • Analogy: pressure in a tire – except, gas pressure acts in all directions – stress acts along one direction Notes 1160: Stress and Strain 4 Stress: Simplest Definition F Cross-sectional Area, A stress Force Area = σ = F A 5 N σ = 5 0 0002 2 N m . σ = 25 kPa 2 cm 2 Notes 1160: Stress and Strain 5 Strain: Simplest Definition • Measure of how much the distance between atoms changes when a force is applied to a solid 5 N ∆ strain = change in length original length ε = ∆ strain has no units Notes 1160: Stress and Strain...
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This note was uploaded on 10/25/2009 for the course CEE 1160 at Cornell.

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3_stress_and_strain_09 - Notes 1160 Stress and Strain 1 The...

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