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lecture12 - OBJECTIVES To understand Stress-strain diagrams...

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OBJECTIVES To understand Stress-strain diagrams To identify the characteristics, elastic and plastic deformation , work , strain energy & strain hardening . To apply stress-strain concepts to simple biomechanical situation
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How to generate a stress-strain curve? Stress = F/A Strain = ∆L/L a) You measure the original length (L) and the original area (A) L A
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How to generate a stress-strain curve? Stress = F/A Strain = ∆L/L a) You measure the original area (A) and the original length (L) b) You apply force, so you know F c) You measure the change in displacement, so you know ∆L
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Stress-Strain Diagram Examples for a variety of materials Allow for comparisons of mechanical properties between materials. Allow for the determination of material behavior
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Stress-Strain Diagram In-Class Exercise I (10 min.) Independently answer the assigned question (5 minutes) Form a group of four and discuss your answers (5 minutes).
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Determination of Yield Point 0.2% offset method
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Stress-Strain Diagram Key Characteristics P-proportionality limit E-elastic limit Y-yield point U-Ultimate point R-Rupture or failure point O-Origin
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Elasticity Linear & Non-linear elastic materials
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Nature of Deformation Elastic & Plastic Deformations
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