Lectures1-2 - Structural Mechanics and Dynamics AE213...

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1 Structural Mechanics and Dynamics AE213 Professor Ferri M H Aliabadi
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2 Course Layout Shear flow analysis for thin walled sections Structural failure assessment Buckling analysis Main Topics covered are:
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3 Shear flow analysis for thin walled sections Shear flow in open sections Shear flow in closed sections Shear Centre On completion of this part you should have gained an understanding of thin walled aircraft structures under general loading conditions. It will allow you to assess the effect of aerodynamic loading on the performance of an aircraft design. Text book: Aircraft Structures by T.H.G.Megson This is the extension of beam theory (1 st year) to thin walled sections. The topics covered include: Loading
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4 Structural Failure Assessment Two dimensional stress fields Principal stresses Mohr’s circle Two dimensional strain fields Stress-Strain relationship Failure assessment
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5 Buckling Analysis P z P A S M P P L V 1 V 2 Bending Stiffness EI P z v P A B On Completion of this part you will be able to determine the Critical Buckling load and deflection of Struts with different end conditions and eccentricity Buckling loads will be determined equilibrium of forces and moments
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6 Aircraft Structures An aircraft structure performs two essential functions: 1. It maintains the aerodynamic shape and contain the content 2. It transmits and resists loads applied to its surface Aircraft structures are usually made of stiffened shells. An unstiffened shell monocoque shell of large cross-section would require fairly thick walls to avoid buckling of the skin. Hence a Semi-monocoque construction plays is usually used in which stiffeners play an important role, allowing a thinner skin to be used.
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7 Wing Wing box is a Closed Section Longitudinal members are Open Section
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8 Fuselage
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9 Review of Classical Beam Theory Classical beam theory assumes that a beam is a member that is long in one direction and short in the other two directions, the member has a high aspect ratio. Compress Stretch Neutral surface z y x z After Deformation Horizontal lines become curved Vertical lines remain straight, yet rotate Before Deformation
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10 z y x x y y z z Longitudinal axis Neutral axis z z a. The shape of the cross-section of the beam is not changed by any loading.
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Lectures1-2 - Structural Mechanics and Dynamics AE213...

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