14 Oct 22 - Structures 7

14 Oct 22 - Structures 7 - AOE 2104--Aerospace and Ocean...

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Unformatted text preview: AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 22 2009 Aircraft Structures 7 Click to edit Master subtitle style AOE 2104 Introduction to Aerospace Engineering Aircraft Structures 7 AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 22 2009 Aircraft Structures 7 We looked at how we might select a material based on two sets of requirements Mechanical Properties Production related issues During our conversation we came across interesting alloy designations. Just what does 2104-T4 really mean? Lets find out! Last time AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 22 2009 Aircraft Structures 7 Aluminum alloys have been around for quite some time! Here is a condensed view of the major developments which are relevant to aircraft structures Information from these lectures can be found in Airframe Structural Design by Michael Niu should you be curious for more information Aluminum and its alloys AOE 2104--Aerospace and Ocean Engineering Fall 2009 Virginia Tech October 22 2009 Aircraft Structures 7 { 5 A D F 5 4 E 3 -C 3 5 C -4 9 4 3 -A 3 8 3 -0 1 C 9 E C 3 1 7 D F B } 1920s { 7 3 5 D E 6 9 8 -B 4 D 7 -4 2 E 9 -A 2 8 E -0 9 C 6 8 7 3 9 0 9 F 3 } Aluminum 2014 common in aircraft construction { D 0 D B D 0 8 6 -3 B A 8 -4 E 6 F -8 0 F 0 -B 8 2 F 5 B A B 1 B 3 D } 2014 is an aluminum-copper-magnesium alloy { A 1 F E 4 7 0 -6 B 2 3 -4 C 0 E -A 7 1 3 -8 6 1 3 0 D 4 8 0 8 B 9 } 1940s { E F E 8 F 3 -B 4 A 5 -4 C D C -8 1 5 4 -5 3 A F 0 B 4 3 D 0 3 D } strength required! (Higher performance aircraft!) { 8 C 0 3 4 1 3 -A 8 0 4 -4 F 6 A -B 4 C D -9 B 0 7 9 7 A 7 4 D } Introduction of 7000 series alloys (Al-Zn-Mg-Cu) { 4 B 7 C D C 1 4 -8 1 2 4 -4 6 9 5 -9 5 D 9 -1 E 1 E 4 2 4 E 2 8 6 E } 1950s { 2 7 D F A E 5 D -5 5 4 -4 C 5 C -8 0 6 4 -0 D F 6 A 4 F E D B 9 5 } blems of stress corrosion cracking remain, fatigue failure of aircraft spars ca le strength but no increase in fatigue resistance { A 0 D E 2 1 2 4 -5 B E -4 A D 5 -9 7 4 0 -B 9 A F B A B 9 F 8 C A }...
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14 Oct 22 - Structures 7 - AOE 2104--Aerospace and Ocean...

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