Chapter4 - Mechanics Materials I Chapter 4 Equilibrium of...

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Mechanics & Materials I FAMU-FSU College of Engineering Department of Mechanical Engineering Chapter 4 Equilibrium of Rigid Bodies
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Equilibrium of Rigid Bodies Equilibrium of rigid bodies: The situation when the external forces and moments acting on a rigid body form a system equivalent to zero 0 ) ( 0 = × = = F r M F o
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Equilibrium in Two Dimensions Here the structure and the forces applied to it are contained in the same plane. • Example: = = = + + + 0 0 0 0 M F F y x
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Equilibrium Free-Body Diagram (FBD) – Step 1. Identify the body or combination of bodies – Step 2. Isolate this body and draw an outline – Step 3. Replace the surrounding with forces to keep the structure in equilibrium – Step 4. Choose a set of coordinate axes
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Equilibrium Types of Forces: – Two force members (trusses, frames, machines,...)
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Equilibrium Taking moment about A or B: Or,
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Equilibrium
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Equilibrium
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Equilibrium
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Equilibrium: support reactions Support reactions are required for static
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