Aerospace structural Analysis

Teacher

Dr. Sangram Samal

Category

Core Courses

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Course Name : Aerospace structural Analysis

Code(Credit) : CUTM1099(3-0-3)

Course Objectives

  • To provide the students an understanding on Aerospace Structures and Materials
  • To study the shear stresses in wing, fuselage, wing spar, attachments
  • To study velocity and load diagram for different condition

Learning Outcomes

  • Understand Aerospace Structures and Materials
  • Understand load paths and demonstrate the knowledge of structural behavior in fuselage and wing structures
  • Calculate the stresses in wing, fuselage, wing spar, attachments
  • Differentiate and analyse the types of aircraft fittings, bolt fittings, Riveted connections and their failures.
  • Estimate the load of aircraft at different condition
  • Able to complete structural design in project mode

Course Syllabus

Module I: Aerospace Structures and Materials uses (6hrs)

monocoque, semimonocoque, corrugated, sandwich structure, reinforced and honeycomb structures, aerospace materials, metallic and non metallic materials, use of aluminum alloy, titanium, stainless steel, composite and ceramic materials.

 

Module II: ANALYSIS OF WINGS (5hrs)

Basics of aircraft components and functions of parts, Construction concepts for wing, control surfaces and tail plane. Analysis of multi‐cell wing structures for bending, shear and torsional loads. Method of successive approximation, analysis of ribs, cut outs in wings.

 

Module III: ANALYSIS OF FUSELAGE (4hrs)

Construction concepts for fuselage, Analysis of fuselage structures for bending, shear and torsional loads. Analysis of fuselage frames, cut outs in fuselages.

 

Module IV: ANALYSIS OF WING SPAR   (5hrs)

Types of spar construction, diagonal tension concept, semi‐diagonal tension concept, design of spar web: shear resistant, diagonal tension, semi‐diagonal tension web. Analysis of parallel and tapered spar.

 

Module VI: AIRCRAFT FITTINGS AND CONNECTIONS (6 hrs)

Types of aircraft fittings, Wing to spar attachments, Single bolt fittings, Multi bolt fittings, Bolt group analysis, Shear, bending and tensile failures of bolts, Analysis of lugs to normal and oblique loadings. Riveted connections and strength of rivets.

 

Module VII: V-N DIAGRAM WITH GUST LOAD(3 hrs)

Loads on an aircraft for different condition, V-n diagram,

Project-  Students are expected to complete following
  • Perform structural calculations establish the structural requirements and constraints apprehend the applicable structural standards for an aircraft
  • Perform structural calculations such as buckling, natural mode and frequencies, fatigue, flutter speed, reserve factor, stress analysis on various aircraft sections and design concepts for appropriate aircraft loads. Various analyses to be performed are free-free analysis, normal modes, linear and nonlinear analysis, buckling and post buckling analysis.
  • Joint and fastener calculations, attachment lugs etc.
  • Perform fatigue life and crack growth analysis through selection of critical primary and secondary locations on structure
  • Carry out optimization on the finalized design concepts and make final layout.
  • Create composite canopy for aircraft
Steps:
  1. V-n diagram for design study
  2. Critical loading performance and final V-n graph calculation
  3. Gust and maneuverability
  4. Structural design study- Theory approach
  5. Load estimation of wings
  6. Wing spar and stringer calculation
  7. Wing shear flow calculation
  8. Load estimation of fuselage
  9. Fuselage shear flow calculations
  10. Design of miscellaneous members
  11. Detailed structural
  12. Design and manufacture the structure (use composite material)
  13. Complete the documentation
Text Books:
  1. M.G. Megson, “Aircraft Structures for Engineering Students”, Fifth edition, ButterworthHeinemann, 2012.
  2. H. Bruhn, “Analysis and Design of Flight Vehicles Structures”, Tristate off set company, USA, 1985.
  3. J. Peery and J.J. Azar, “Aircraft Structures”, 2nd edition, McGraw – Hill, N.Y., 1999.
  4. Timoshenko and D.H. Young, “Elements of strength materials Vol. I and Vol. II"., T. Van Nostrand CoInc PrincetonN.J. 1990.
Reference Books:
  1. K. Donaldson, "Analysis of Aircraft Structures ‐ An Introduction", Second edition, Cambridge University Press, 2012.
  2. Howard D Curtis, ‘Fundamentals of Aircraft Structural Analysis’, WCB‐ McGraw Hill, 1997.
  3. M. Rivello, “Theory and Analysis of Flight Structures”, McGraw Hill, 1993.

  Source of reference; NSQF

Session Plan

Session 1

monocoque, semimonocoque, corrugated structure

Aircraft_structure

https://www.youtube.com/watch?v=aYB2h_tUfYM

Session 2

sandwich structure, reinforced and honeycomb structures

sandwich structure

https://www.youtube.com/watch?v=bdyjCAz4ofE

https://www.youtube.com/watch?v=aL8HQtpxQqg

Session 4

metallic and non metallic materials, use of aluminum alloy

Aluminum and Aluminum Alloys Davis

Session 5

titanium, stainless steel

Session 6

composite and ceramic materials use in aerospace industry

https://www.youtube.com/watch?v=ZgSWLFd9dOY

https://www.youtube.com/watch?v=is1BBilkyUM

Session 7

Basics of aircraft components and functions of parts

Aircraft_construction

Session 8

Construction concepts for wing

https://www.youtube.com/watch?v=60CmDTly8Dg

Wing

Session 9

control surfaces and tail plane.

tail plane

Session 10

Analysis of multi‐cell wing structures for bending, shear and torsional loads

bending an shear

https://www.youtube.com/watch?v=CaayhUu58Zk

Session 11

analysis of ribs, cut outs in wings, Method of successive approximation

Session 12

Construction concepts for fuselage

fuselage

https://www.youtube.com/watch?v=UM4SuFBYxnA

Session 13

Analysis of fuselage structures for bending, shear and torsional loads

bending an shear fuselage

https://www.youtube.com/watch?v=5hOqjd2tgJw

Session 14

Analysis of fuselage frames, cut outs in fuselages

Session 15

Types of spar construction

Session 16

diagonal tension concept, semi-diagonal tension concept

diagonal tension

Session 17

design of spar web: shear resistant

Session 18

design of spar web: diagonal tension and semi-diagonal tension web

Session 19

Analysis of parallel and tapered spar

Session 20

Session 21

Wing to spar attachments, Single bolt fittings

https://www.youtube.com/watch?v=qbBhg8xISug

Session 22

Wing to spar attachments,  Multi bolt fittings

https://www.youtube.com/watch?v=5QlQKuLvGNM

Session 23

Bolt group analysis

Bolt

Session 24

Shear, bending and tensile failures of bolts

Session 25

Analysis of lugs to normal and oblique loading

Shear tensile failures of bolts

Session 26

Session 28

Aircraft Maneuvering Loads

Load Maneuvering

Case Studies

Case Studies

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