AE 440 Structures Discipline Lecture 6

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# AE 440 Structures Discipline Lecture 6 - PowerPoint PPT Presentation

AE 440 Structures Discipline Lecture 6. Eric Loth For AE 440 A/C Lecture. Structures Responsibilities. Determine V-n relationships and establish a V-n diagram Establish and maintain load paths

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### AE 440Structures Discipline Lecture 6

Eric Loth

For AE 440 A/C Lecture

Structures Responsibilities
• Determine V-n relationships and establish a V-n diagram
• Establish and maintain load paths
• Determine component materials (weights and dimensions to configuration) and consider environmental impact of acquisition, production and operations
• Determine landing gear configuration
• Carry out a detailed structural design of the wing box and wing attachment and structurally design landing gear (weights & dimensions to configuration)
• Employ FEM Analysis
V-n Diagram

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/MainFrame?OpenFrameSet

• How loads are transferred from one structural member to another
• Wing skin—torsion and shear stress
• Wing ribs—maintain shape and rigidity, transfer loads from skin to spars
• Wing spars—bending moments
• Empennage loads due to trim, maneuvering, turbulence and gusts
• Pressure loads due to cabin pressurization
• Landing gear loads due to landing impact, taxiing and ground maneuvering
• Loads induced by the propulsion installation when the latter is attached to the fuselage
Structural Components
• Spars
• Ribs
• Skin
• Beam shear
• Beam bending
• Torsion

Cessna Citation II

Materials
• Selection criteria
• Strength
• Stiffness
• Density
• Cost
• Typical materials
• Aluminum
• Composites
• Steel
• Titanium
• Mini-UAV materials
• Plastic
• Balsa
• Fiber (cloth)