16 Oct 29 - Structures 8

16 Oct 29 - Structures 8 - AOE 2104-Aerospace and Ocean...

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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 Click to edit Master subtitle style AOE 2104 Introduction to Aerospace Engineering Aircraft Structures 8
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 We looked at alloy designations and what they mean… we will return to some of those definitions once we return homework Questions? Concerns? Comments? Today we will look at a few selected aircraft structure design issues Cutouts Stiffener shapes Last time…
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 Last time… here is the chart you were missing
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 As structural analysts we like smooth continuous structures but unfortunately, a practical aircraft design will contain many cutouts! We need cutouts! Windows Doors Bomb bays Access for cables/hydraulic lines Service panels Inspection access holes I have designed the perfect structure…
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 The most efficient structure is one where the loading path is direct Cutouts cause stress concentrations Stress concentration factor (k) is the ratio of maximum stress in the cross-section to the reference stress in the cross-section Cutouts…
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AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 29 2009 Aircraft Structures 8 Circular holes – stress concentration factor of 3 Elliptical holes – stress concentration factor dependent on ratio of axes, here it is 2.3 Typical shapes of cutouts…
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16 Oct 29 - Structures 8 - AOE 2104-Aerospace and Ocean...

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