25Skin-stringeranalysis0

25Skin-stringeranalysis0 - AAE352 Lecture 25 Skin-stringer...

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AAE 352 1 AAE352 Lecture 25 Skin-stringer idealizations Reading – Class notes, Chapter 7
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AAE 352 2 Summary Shear stress develops on beam cross- sections and also longitudinally because the bending moment changes Shear flows are tangent to thin webs Relations developed thus far assume that there is no twist – load is applied at the shear center.
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The way things started AAE 352 3
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Germany was first – The Junkers F-13 AAE 352 4
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Function of Aircraft Structures AAE 352 5 The structures of most flight vehicles are thin walled structures (shells) Resists applied loads (Aerodynamic and inertial loads acting on the wing structure) Provides the aerodynamic shape Protects the contents from the environment Adolph Rohrbach
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Skin functions AAE 352 6 Skin reacts the external applied torsion and shear forces Skin transmits aerodynamic forces to the longitudinal and transverse supporting members acts with the longitudinal members in resisting the applied bending and axial loads\ acts with the transverse members in reacting the hoop, or circumferential, load when the structure is pressurized.
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Stiffeners and stringers AAE 352 7 resist bending and axial loads along with the skin divide the skin into small panels and thereby increase its buckling and failing stresses act with the skin in resisting axial loads caused by pressurization.
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Skin-stringer modeling sub-divide load carrying functions AAE 352 8 Upper Wing Skin Lower Wing Skin Web Web Stiffener (Stringer/Spar Cap) y z h Red areas resist only normal stresses Thin areas resist only shear So what?
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