Aircraft Structures

Teacher

Dr. Sangram Samal

Category

Core Courses

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Course Name : Aircraft Structures

Code(Credit) : CUTM1098(3-1-0)

Course Objectives

  • To provide the students an understanding on the analysis of aircraft structural components.
  • To study the properties of materials used in Aircraft structure.
  • To study the shear flow at different section.
  • To study stress analysis of wing and fuselage

Learning Outcomes

  • Analyse the truss structure and find forces acting in the individual members deflections of the truss with the nature using different methods.
  • Calculate the reaction forces for indeterminate beams. Should be able to draw shear force and bending moment diagrams for indeterminate beams using different methods.
  • Calculate the bending stresses in unsymmetrical sections using different
  • Calculate crippling load of columns and beam columns with various end conditions using Euler’s method and Rankine’s formula.
  • Analyse the buckling and crippling characteristics of rectangular shear panels.Analyse the buckling and crippling characteristics of rectangular shear panels.

Course Syllabus

Module I: STATICALLY INDETERMINATE STRUCTURES (4hrs)

Shear force and bending moment of fixed‐fixed beam, Propped cantilever beam, Continuous beam, Clapeyron’s Three Moment Equation, Moment Distribution Method.

Practice: Bending stress of a indeterminate beams using 3D Experience Tool

 Module II: ENERGY METHODS (5hrs)

Strain Energy in axial, bending, torsion and shear loadings. Castigliano’s theorems and their applications. Energy theorems – dummy load & unit load methods – energy methods applied to statically determinate and indeterminate beams, frames & trusses. Deflection of indeterminate beams using energy method and unit load method

Practice: Deflection of beams using 3D Experience Tool

free and forced Vibration of a Cantilever Beams using 3D Experience Tool

 Module III: SHEAR FLOW IN OPEN SECTIONS (6hrs)

Thin walled beams, Concept of shear flow and shear centre, Elastic axis. Shear flow in single and multi cell under bending with walls effective and ineffective, one axis of symmetry, unsymmetrical beam sections. Structural constraint, Shear stress distribution in constrained open sections

 Practice: Locate Shear Centre for open section

 Module IV: SHEAR FLOW IN CLOSED SECTIONS (5hrs)

Bredt-Batho formula, Shear flow in single and multi, cell closed structures under bending and torsion, Shear stress distribution in constrained closed sections,

Practice:  Locate Shear Centre for closed section

Determination of Principal axis of Unsymmetrical beams

 Module V: BUCKLING OF PLATES (5hrs)

Bending of thin plates – rectangular sheets under compression - local buckling stress of thin

walled sections.

Practice: Buckling load estimation of thin plates using

 Module VI: CRIPPLING OF PANELS (4hrs)

Crippling stresses by Needham's and Gerard's methods. Thin walled column strength. Sheet stiffener panels. Effective sheet width, inter rivet and sheet wrinkling failures

Practice: Shear failure of bolted and riveted Joints using

Module VII: STRESS ANALYSIS OF WING AND FUSELAGE (3hrs)

shear force and bending moment distribution over the aircraft wing and fuselage

Practice: Composite sheet with glass fiber

Text Books:
  1. M.G. Megson, “Aircraft Structures for Engineering Students”, Fifth edition, ButterworthHeinemann, 2012.
  2. J. Peery, “Aircraft Structures”, Dover Publications Inc., 2011.
  3. H. Bruhn. ‘Analysis and Design of Flight Vehicles Structures’, Tristate off set company,USA, 1985.
  4. S. and Young D.H. "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 Level 6

Session Plan

Session 1

Statically indeterminate structures, Shear force and bending moment of fixed‐fixed beam

statically indeterminate structures

Session 2

Propped cantilever beam, Continuous beam and SF and Bending Moment

Session 3

Session 4

Moment Distribution Method - structural analysis

Moment Distribution Method

https://www.youtube.com/watch?v=E3zLTnc_nlk

Session 5

Practice: Bending stress of a indeterminate beams using 3D Experience Tool

Session 6

Practice: Bending stress of a indeterminate beams using 3D Experience Tool

Session 7

Strain Energy in axial, bending, torsion and shear loading

Strain Energy Method

Session 8

Castigliano’s theorems and their applications

Castigliano’s theorems

https://www.youtube.com/watch?v=4bweCDd_JTg

Session 9

Energy theorems – dummy load & unit load methods

https://www.youtube.com/watch?v=2shXkiiChzk

Unit Load Method

Session 10

energy methods applied to statically determinate and indeterminate beams, frames & trusses

Session 11

Deflection of indeterminate beams using energy method and unit load method

Session 12

Practice: Deflection of beams using 3D Experience Tool

Session 13

Practice: Deflection of beams using 3D Experience Tool

Session 14

Thin walled beams, Concept of shear flow and shear center

https://www.youtube.com/watch?v=eXdWs7xPM4Q

shear center

Session 15

Shear flow in single cell under bending

Session 16

Shear flow in multi cell under bending with walls effective and ineffective

Session 17

one axis of symmetry, unsymmetrical beam sections.

Session 18

Structural constraint, Shear stress distribution in constrained open sections

Session 19

Practice: Locate Shear Centre for open section

Session 20

Practice: Locate Shear Centre for open section

Session 21

Bredt-Batho formula, Shear flow in single cell closed structures under bending and torsion,

Bredt-Batho

Shear flow in single cell - torsion

Session 22

Shear flow in  multi cell closed structures under bending and torsion,

multi cell

Session 23

Shear stress distribution in constrained closed sections

Session 24

Practice:  Locate Shear Centre for closed section

Determination of Principal axis of Unsymmetrical beams

Session 25

Practice:  Locate Shear Centre for closed section

Determination of Principal axis of Unsymmetrical beams

Session 27

rectangular sheets under compression

Session 28

local buckling stress of thin walled sections

Session 29

Practice: Buckling load estimation of thin plates using 3DS / experimental

Session 30

Practice: Buckling load estimation of thin plates using 3DS / experimental

Session 31

Crippling stresses by Needham's and Gerard's methods

NEEDHAM’S METHOD

https://www.youtube.com/watch?v=VzDt2IRt1fs

Session 32

Thin walled column strength. Sheet stiffener panels.

Session 33

Effective sheet width, inter rivet and sheet wrinkling failures

Session 34

Practice: Shear failure of bolted and riveted Joints using

Session 35

Practice: Shear failure of bolted and riveted Joints using

Session 36

Shear force distribution over the aircraft wing and fuselage

load on aircraft

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

Session 37

Bending moment distribution over the aircraft wing and fuselage

Bending moment for wing

https://slideplayer.com/slide/5288188/

Session 38

Practice: Composite sheet with glass fiber

Session 39

Practice: Composite sheet with glass fiber

Case Studies

Case Studies

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