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Ace 402 lec 1&2

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Dr Mohamed Elfarran

The document outlines a lecture on fuselage structural design. It discusses iterative methods for calculating effective width and radius of gyration of thin-walled structures. It also covers loads acting on the fuselage, fuselage structure components like stringers and frames, and examples of analyzing stresses in circular fuselage sections. The document concludes by mentioning that stress analysis of wings will be covered next.

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Airframe Design and Construction Part 2 Fuselage Structural Design Instructor: Dr Mohamed Elfarran Aerospace Engineering Department Cairo University 2020 ACE 402- Dr Mohamed Elfarran 1 Lecture 2.1: Intro
ACE 402 Road Map 1: Aircraft loads 2 : Section Properties Review 3: Bending Stresses 4: Column/Thin Sheets Stability ( buckling) 5: Crippling Strength 6: Sheet Effectiveness And Inter- rivet Buckling 7: Stringers Failing Strength 8: Wing Stress Analysis 2020 ACE 402- Dr Mohamed Elfarran 2
Area Effective Iterative Method 2020 ACE 402- Dr Mohamed Elfarran 3 Failure Load DEPENDS Radius Of Gyration Radius Of Gyration DEPENDS Effective Width. Effective Width DEPENDS Failure Stress = ?!!!!!!!!!
Area Effective Iterative Method 2 Bruhn Iterative Method Steps: 1. Calculate Crippling Strength ( Lec 5) as Standalone Column 2. Get Effective width Wo based on S1 3. Get 4. Get Fc from Johnson-Euler Equation: 5. Calculate W based on Fc 6. If d(W-Wo) > 10%, then repeat 2020 ACE 402- Dr Mohamed Elfarran 4 =
Critical Stress Summary 1. Crippling stress is the failing stress of the corner stringers in compression side. (Fcs) 2. Column failing stress is the failing stress of middle stringers in compression side. (Fc) 3. Ultimate stress is the failing stress of the stringers in the tension side. 2020 ACE 402- Dr Mohamed Elfarran 5
Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 6
Loads acting on fuselage 2020 ACE 402- Dr Mohamed Elfarran 7
Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 8
Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 9
Fuselage Crippling 2020 ACE 402- Dr Mohamed Elfarran 10
Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 11
fuselage load-bearing members 2020 ACE 402- Dr Mohamed Elfarran 12
Section properties of thin sheets 2020 ACE 402- Dr Mohamed Elfarran 13
Circular arc section 2020 ACE 402- Dr Mohamed Elfarran 14
Example 1 Circular fuselage 2020 ACE 402- Dr Mohamed Elfarran 15
Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 16
Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 17
Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 18
Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 19
Wing Stress Analysis Ref C7 What Next ?!!! 2020 ACE 402- Dr Mohamed Elfarran 20 Assignments: All Problems in C7

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Ace 402 lec 1&2

  • 1. Airframe Design and Construction Part 2 Fuselage Structural Design Instructor: Dr Mohamed Elfarran Aerospace Engineering Department Cairo University 2020 ACE 402- Dr Mohamed Elfarran 1 Lecture 2.1: Intro
  • 2. ACE 402 Road Map 1: Aircraft loads 2 : Section Properties Review 3: Bending Stresses 4: Column/Thin Sheets Stability ( buckling) 5: Crippling Strength 6: Sheet Effectiveness And Inter- rivet Buckling 7: Stringers Failing Strength 8: Wing Stress Analysis 2020 ACE 402- Dr Mohamed Elfarran 2
  • 3. Area Effective Iterative Method 2020 ACE 402- Dr Mohamed Elfarran 3 Failure Load DEPENDS Radius Of Gyration Radius Of Gyration DEPENDS Effective Width. Effective Width DEPENDS Failure Stress = ?!!!!!!!!!
  • 4. Area Effective Iterative Method 2 Bruhn Iterative Method Steps: 1. Calculate Crippling Strength ( Lec 5) as Standalone Column 2. Get Effective width Wo based on S1 3. Get 4. Get Fc from Johnson-Euler Equation: 5. Calculate W based on Fc 6. If d(W-Wo) > 10%, then repeat 2020 ACE 402- Dr Mohamed Elfarran 4 =
  • 5. Critical Stress Summary 1. Crippling stress is the failing stress of the corner stringers in compression side. (Fcs) 2. Column failing stress is the failing stress of middle stringers in compression side. (Fc) 3. Ultimate stress is the failing stress of the stringers in the tension side. 2020 ACE 402- Dr Mohamed Elfarran 5
  • 6. Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 6
  • 7. Loads acting on fuselage 2020 ACE 402- Dr Mohamed Elfarran 7
  • 8. Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 8
  • 9. Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 9
  • 10. Fuselage Crippling 2020 ACE 402- Dr Mohamed Elfarran 10
  • 11. Fuselage Structure 2020 ACE 402- Dr Mohamed Elfarran 11
  • 12. fuselage load-bearing members 2020 ACE 402- Dr Mohamed Elfarran 12
  • 13. Section properties of thin sheets 2020 ACE 402- Dr Mohamed Elfarran 13
  • 14. Circular arc section 2020 ACE 402- Dr Mohamed Elfarran 14
  • 15. Example 1 Circular fuselage 2020 ACE 402- Dr Mohamed Elfarran 15
  • 16. Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 16
  • 17. Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 17
  • 18. Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 18
  • 19. Example 2 Idealized Circular Fuselage 2020 ACE 402- Dr Mohamed Elfarran 19
  • 20. Wing Stress Analysis Ref C7 What Next ?!!! 2020 ACE 402- Dr Mohamed Elfarran 20 Assignments: All Problems in C7