aae 450 spring 2008 steven (“cj”) hiu 03/27/2008 “thank you for the memories” mat & fam...
DESCRIPTION
AAE 450 Spring 2008 Strength Increase – Pressurized Monocoque Flight pressure-stabilized design 17% increase in tank strength vs. axial buckling 30-40% increase in tank strength vs. bending Structures Increase in axial buckling strength versus tank internal pressure and dimensionsTRANSCRIPT
AAE 450 Spring 2008
Steven (“CJ”) Hiu 03/27/2008
“Thank You For The Memories”
MAT & FAM Coder – Structures
Composite Tanks AnalysisCAD – Tanks, Intertank Couplers, Assembly Views
<1>
Structures main code – tanks.m
<2>
Propellant TypePropellant Mass
Tank MaterialMax g loading
Calculate Dimensions to hold propellant volume
Spherical Tank?
L/D > 3?
Inter-Tank
Analysis
Add hoops and/or increment thicknessCalculate stage mass
Tank Buckling
& Bending
Aerodynamic Loads
Inter-stageSkirt
Analysis
Add hoops and/or increment thickness
Add stringers/hoops
NO
YES
YES
NO
FAIL PASS
PASS
COST, Dimensions, MassPASS
FAIL
FAIL
PASS
Prop Code (in MAT)
AAE 450 Spring 2008
Strength Increase – Pressurized Monocoque Flight pressure-stabilized
design 17% increase in tank strength
vs. axial buckling 30-40% increase in tank
strength vs. bending
Structures<3>
0.01 0.1 1 100.1
1
10
f(x) = 0.0604290533651837 ln(x) + 0.358329170578787
Increase in Buckling Stress Coefficient for Pressurised Cylindrical Tanks Under Bending
DCb
P/E(r/t)^2
DCb
(Nor
malized)
Design Range for vehicle
0.01 0.1 1 10 1000
0.05
0.1
0.15
0.2
0.25
Y
f z( )
X z
corr f X( )
Y( ) 0.9873
Increase in axial buckling strength versus tank internal pressure and dimensions
crPD
2ktanktan
t2D
EP
Acknowledgements Kevin Kloster, John Tsohas for help and advice Alan Schwing for tireless dedication
“He’s like some kind of…non- giving up…school guy!” – Bart Simpson
Brandon White for filling up gaps and much beer All MAT coders, especially Danielle Yaple, the Borg
Queen Everyone on the team – you’ve made it a great semester
despite the blood, sweat and tears (manly, manly tears).
AAE 450 Spring 2008 <4>Structures
Backup Slide 1 – Carbon Fiber Analysis
Structures<5>
Metallic stress
Carbon stress
metallic lining
carbon fiber sleeve
Pcontact
Pcontact
P
( ) 2 2
,1 sincontact m contact c
m m c wind c
P P r P rE t E ta
c md d
( )contact mm
m
P P rt
contact cm
c
P rt
Image: Hiu
Backup Slide 2
AAE 450 Spring 2008Structures
<6>
Nose Cone
3rd Stage Propellant Tank
3rd Stage Engine2nd Stage Avionics
Inter-stage Skirt
2nd Stage Propellant Tank
2nd Stage Engine
2nd Stage LITVC Tank
Inter-stage Skirt
1st Stage Pressurant Tank
1st Stage Oxidizer Tank
1st Stage Fuel Tank
1st Stage Engine
Inter-tank Coupler
1st Stage Avionics
Spin Table
Image: Hiu, Donahue, Hinton, Doyle, White
AAE 450 Spring 2008 <7>
Backup Slide 3
AAE 450 Spring 2008 <7>
Structures
Image: Hiu