Lecture 14- Structures 4

Lecture 14- Structures 4 - AOE 2104--Aerospace and Ocean...

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Unformatted text preview: AOE 2104--Aerospace and Ocean Engineering Fall 2010 Virginia Tech October 26 2010 Aircraft Structures 4 Click to edit Master subtitle style AOE 2104 Introduction to Aerospace Engineering Aircraft Structures 4 AOE 2104--Aerospace and Ocean Engineering Fall 2010 Virginia Tech October 26 2010 Aircraft Structures 4 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 2010 Virginia Tech October 26 2010 Aircraft Structures 4 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 2010 Virginia Tech October 26 2010 Aircraft Structures 4 { 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 } 1960s { 1 E 8 C 6 F 0 -9 6 9 2 -4 6 C 3 -8 C F 4 -2 0 5 4 6 B F 4 1 D 5 } rosion cracking and low fatigue resistance { 2 7 8 6 0 8 B 3 -0 5 7 -4 C 0 F -9 8 E 8 -0 E 6 5 3 C 1 A 8 2 7 6 } 2024-T3 offers good fatigue resistance (and re { 0 4 B 4 F 9 5 C -6 B 5 7 -4 A C 5 -B 4 A 0 -7 6 B 4 3 D 0 3 B D 8 } Demand increases for 7000 series strength, with 2024-T le ageing treatment which gave a dramatic improvement in resistance to stre reased tensile strength by 10% { 4 D 8 5 D 1 0 -3 B A 9 -4 9 E 3 -9 B A 4 -2 9 3 2 0 9 3 5 8 5 A F } Work began to regain the additional strength { F C 5 6 F 1 C -8 A B-4 E 7 5 -B 1 9-3 B A 9 B 7 F B 6 5 C 9 } 1970s { 2 D 3 9 B 0 F 4 -B 2 E B -4 5 B A -A 0 7 -F 1 A 4 3 8 0 F E 6 7 } appear which balance strength and fatigue life well ow better strength in the presence of cracks (7010, 7075) AOE 2104--Aerospace and Ocean Engineering Fall 2010 Virginia Tech October 26 2010...
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Lecture 14- Structures 4 - AOE 2104--Aerospace and Ocean...

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