AC LEC 18-09

AC LEC 18-09 - Lecture 18 - Mechanical Properties of...

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Lecture 18 - Mechanical Properties of Materials Stress and Strain Tensile, Compression, Shear Stresses Poisson’s Ratio Engineering Stress and Strain vs True Stress and Strain The Tensile Test Elastic Properties Plastic Properties Liberty Ship SS Schenectady 1943
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Engineering Stress-Strain Elastic region Plastic region
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Engineering Stress and Strain in Tension Engineering Stress Engineering Strain ε = ( l l 0 ) / l 0 = l / l 0
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Tension and Compression
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Tension and Shear Poisson’s Ratio ν = -ε / ε Shear Stress τ = S/A Shear Strain γ = a / h = tan θ Elastic Shear τ = G γ G = elastic modulus
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Tensile Specimens Round Rectangular
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The Load Frame
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The σ ε Curve
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Elastic Deformation Hooke’s Law σ = E ε E = Modulus of Elasticity
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Elastic Constants
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Elastic Constants of Engineering Materials
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When does the material start to deform permanently? Pick a value of
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AC LEC 18-09 - Lecture 18 - Mechanical Properties of...

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