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012109-Ch4 - 2 92-411 Machine Design Winter 2009 Department...

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1 92-411 Machine Design Winter 2009 Department of Mechanical, Automotive, and Materials Engineering 92-411: Machine Design I 2 Chapter 4: Deflection and Stiffness | Rigidity is the assumption that a body does not distort under loading by forces or moments | Elastic or plastic deformation occurs naturally | One form of distortion, flexibility, is the “ability of a body to distort by bending” | Deflection analysis: assembly vs. function, processes, optimal conditions 92-411: Machine Design I 3 Chapter 4: Deflection and Stiffness | Part design criteria: z Deflection limitation: particular force/deflection characteristic z Stress limitation: resist yielding/failure | Concentrate on distortion of single bodies | Introduce distortion as it applies to part assemblies 92-411: Machine Design I Figure 4-1 4 Chapter 4: Deflection and Stiffness | Elasticity: ability of a material to regain its original configuration after being deformed z Springs exert a force when deformed Linear spring Nonlinear stiffening spring Nonlinear softening spring
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