Final report_Gear

Final report_Gear - Ryerson University Department of...

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Ryerson University MTL700 - Materials Selection for Engineering Design Airbus Landing Gear Project – Final Report Program: Mechanical Engineering Section 1 Due Date: November 27, 2007 Prepared for: Professor H. Bougherara Names Student I.D. Signature Abdallah Elsayed Kenneth Lee
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ABSTRACT Materials and process selection was performed for a landing gear strut on an Airbus A380. The constraints were high stiffness, strength in compression, and good corrosion resistance; free variables were cross sectional area and choice of material. The analytical method was used since there were multiple constraints and one objective, which was to minimize weight. Material indices were found and the best choice of material was determined to be aluminum silicon- carbide. The most efficient shape was of a hollow tube (ring shape) and will be manufactured via conventional machining with diamond tooling. 2
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TABLE OF CONTENTS NOMENCLATURE A.C.G. Aft center of gravity AISI American Iron and Steel Institute CAD Canadian dollars CFRP Carbon fiber reinforced polymer C.G. Center of gravity CO 2 Carbon dioxide F.C.G. Forward center of gravity GFRP Glass fiber reinforced polymer Kg Kilogram MJ Mega Joules UHTS Ultra-high-tensile strength UTS Ultimate tensile strength Greek symbols Mass Density Area Length 2 nd Moment of Inertia Young’s Modulus Loading Constant F Force D o Outer Diameter D i Inner Diameter D Diameter M stiff Material Index for Stiffness n Buckling Loading Constant π Pi M buck Material Index for Buckling r Radius 3
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t Thickness P Pressure σ y Yield Strength M press Material Index for Pressure M corr Material Index for Corrosion Shape Factor for Elastic Buckling LIST OF FIGURES FIGURE DESCRIPTION PAGE 1 Early landing gear design from a World War I SPAD VII airplane. 1 2 Airbus A380 with deployed landing gears. 2 3 Airbus A380 landing gear layout. 3 4 Airbus A380 nose landing gear. 4 5 Shock absorber. 5 6 Simplified model of landing gear strut. 6 7 Geometry of centers of gravity and landing gear. A-1 4
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LIST OF TABLES TABLE DESCRIPTION PAGE 1 Listing of landing gear parts and their functions. 3 2 Listing of traditional/current materials used in landing gear struts 5 3 Summary of landing gear shock absorber. 5 4 Major design requirements for simplified strut model. 7 5 Summary of materials and masses. 11 6 Material and environmental impact. 12 7 Requirements for process selection. 14 5
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CHAPTER 1 – INTRODUCTION The landing gear (or undercarriage) of an aircraft is the structure that forms the interface between the airplane and the ground. The landing gear must support the weight of the aircraft when traveling on the ground in addition to withstanding the shock and stresses experienced during take-off and landing. Landing gears appeared quickly after the Wright Brothers flight in December 1903 [1] and have quickly evolved in design and construction. The first landing gears consisted of struts that were connected to wound bungee cords as a means of shock absorption
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This note was uploaded on 01/18/2012 for the course MECH MTL 700 taught by Professor Habiba during the Fall '11 term at Ryerson.

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Final report_Gear - Ryerson University Department of...

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