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06 Sept 10 - Structures 2

06 Sept 10 - Structures 2 - AOE 2104-Aerospace and Ocean...

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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 Click to edit Master subtitle style AOE 2104 Introduction to Aerospace Engineering Aircraft Structures 2
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 SAVE THE DATE! Hovering Missiles and Disappearing Aircraft Revolutionary New Adaptive Aerostructures Technologies Dr. Ron Barrett October 8th @ 5.00pm in McBryde 100 You are not required to attend, but there will be an essay homework assignment on this topic so it is in your interest to be there to ask questions and to save yourself research time! ANNOUNCEMENT!!!!
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 Had an overview of the history of aircraft structures Named major structural components of the fuselage and wing Can you name them? and their purpose? Any questions? Last time…
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 To answer this, we need to understand a little about solid mechanics Stress – what is it? A measure of intensity of forces over a particular surface in a body Stress is 3-Dimensional and has 9 components in it’s matrix! Essentially it is how hard the atoms at a point in a material are being pulled apart or pushed together. For now, we will consider 1-D only What happens when an external force is applied to a material? Solid tends to deform Material attempts to resist change by an internal force The force per unit area is called stress! (1-D) How does the structure cope with ground and in flight loads? A F area force = = σ
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 Compressive – acts perpendicular to cross-sectional area (pushing) Tensile – acts perpendicular to cross-sectional area (pulling) Shear – acts tangentially to cross-sectional area A look at the three forms of stress A F area force = = τ F F F F F F
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech September 10 2009 Aircraft Structures 2 When stress acts on a material it tends to change shape and size For the rods, the length looks like it should change, right?
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