CH_3--mechanical_properties_of_materials

CH_3--mechanical_properties_of_materials - Ch 3 & 10.6...

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Mechanical Properties of  Materials EMCH 213
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Important Concepts Stress-Strain diagram Ductile Vs. Brittle material Hooke’s Law Poisson’s Ratio Shear Stress-Strain Diagram Generalized Hooke’s Law Creep and Fatigue
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Stress-Strain diagram We’ve already observed that the  nominal or  engineering stress  and  strain  are:        and Where A 0  is the original specimen area and L 0  is the  original specimen length Plotting stress and strain in a  conventional  stress-strain diagram  gives us data about a  material’s strength without regard to it’s  physical dimensions. Another variation of this plot is a  true stress- strain diagram , where      and            Where A and L are the instantaneous, or actual              
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In the elastic region,  σ  is a  liner function of  , this ends  ε at the  proportional limit ,   σ pl . Anytime before reaching 
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This note was uploaded on 04/14/2008 for the course E MCH 213 taught by Professor Lewisdean during the Spring '08 term at Pennsylvania State University, University Park.

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CH_3--mechanical_properties_of_materials - Ch 3 & 10.6...

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