AE 362 AEROSPACE STRUCTURES

COURSE OUTLINE

INSTRUCTOR: Assoc.Prof.Dr. Altan Kayran, Asst. Prof. Dr. Güçlü Seber

Room 203, Tel: 4274 Room 202, Tel: 4257

COURSE ASSISTANT: Burak Sayar

COURSE OBJECTIVE:

This course presents the basic structural analysis principles of aerospace structures with

special emphasis on aircraft structures. Aerospace structures are generally made up of thin

walled members which are assembled together to bring about the final sub-structure such as

wing, control surfaces, fuselage, tail etc. The main aim of the course is to complement the

analysis principles acquired in Strength of Materials and Elasticity and apply them for the

analysis of thin walled members which form the components of sub-structures of aircraft.

Analysis principles are then applied to the structural analysis of sub-structures mentioned

above which are the main building blocks of the aircraft. In various parts of the course

reference is made to the application of numerical solution of complex built-up aircraft

structures. Deformation of aircraft structures under static loads is also treated to provide

introduction to the aeroelastic stability.

TEXTBOOK:

The course will mainly reference two main textbooks.These are:

1- ‘Aircraft Structures for Engineering Students,’ by T.H.G. Megson, 1990, 2nd edition,

John Wiley Sons, ISBN: 0470216530, Call Number: TL671.6 M36

2- ‘Aircraft Structures,’ by D.J. Peery and J.J. Azar, 1982, Mc Graw Hill, ISBN:

0070491968, Call Number: TL671.6 P4

Other reference books include:

3- ‘Analysis and Design of Flight Vehicle Structures,’ by E.F. Bruhn, 1973, Tri-State

Offset Company

4- ‘Analysis of Aircraft Structures,’ by B.K. Donaldson, 1993, McGraw-Hill, ISBN:

007017539X, Call Number: TL671.6.D56

5- ‘Theory and Analysis of Flight Structures,’ R.M. Rivello, 1969, McGraw-Hill, ISBN:

07052985X, Call Number: TL671.6 R53

6- ‘Airframe Stress Analysis and Sizing,’ by M.Niu, 1999, Hong Kong Conmilit Press

Ltd.,ISBN: 9627128082.

7- ‘Structural Loads Analysis for Commercial Transport Aircraft: Theory and Practice,’

by Ted L. Lomax, 1995, AIAA Education Series, ISBN: 1563471140, Call Number:

TL671.6.L597

7- ‘Understanding Aircraft Structures,’ by J. Cutler, 1999, Third Edition, Blackwell

Science, ISBN: 0632050012, Call Number: TL671.6 .88

8- ‘Aeroelasticity,’ by Raymond L. Bisplinghoff, H. Ashley and Robert L. Halfman,

1996, Dover Publications, ISBN: 0486691896, Call Number: TL574.A37B5397

9- ‘Spacecraft Structures and Mechanisms; From Concept to Launch,’ by Thamas P.

Sarafin, 1998, Luwer Academic Publishers, ISBN: 188184019, 0792319962, Call

Number: TL790.S74

10- ‘Advanced Strength and Applied Elasticity,’ by A.C. Ugural and S.K. Fenster,

Prentice Hall PTR, 3rd Edition, 1995, ISBN: 013137589X

COURSE SYLLABUS: Total Hours Allocated: 56 class hours

1- Introduction: Main structural elements of aircraft structures, function of structural

elements, loads on the aircraft, V-N diagrams, materials used, airworthiness

engineering

(5HR)

2- Failure theories and strength considerations: Introduction, static failure theories

(ductile and brittle materials), Fracture concept , Fatigue failure

(6HR)

3- Energy Methods in Structural Analysis: Strain and complementary energy,

principle of virtual work, principle of minimum potential energy, Castigliano’s

method, unit load method, Rayleigh Ritz method

(8HR):

1 st Midterm: Section 1,2,3 :

4- Structural Analysis of Thin Walled Open Section Beams:Flexural analysis of open

section beams; stiffener loads, web shear flows, shear center

(7 HR):

5- Structural Analysis of Thin Walled Closed Section Beams:Shear flow under

transverse loading, shear flow under torsional loading, angle of twist, multicell beams,

shear center

(9 HR):

6- Bending of Unsymmetrical Sections:Generalized theory of beam bending, bending

of unsymmetrical wing-box cross sections

(2HR):

2 nd Midterm: Section 4,5,6 :

7- Structural Analysis of Aircraft Sub-Structures:Fuselage frames, wing rib analysis,

cut-outs in semimonoque structures (wings, fuselages etc.)

(8HR):

8- Elastic Stability:Elastic buckling of slender members, inelastic buckling, effective

length of columns, buckling of flat and curved panels, buckling analysis of stiffened

closed section box beams, post-buckling behaviour of stiffened flat and curved panels

(12 HR)

EVALUATION (out of 105%)

Homeworks: %15

1- HW1: 5%: Section 1

2- HW-2 (%2.5): Section 2,3 :

3- HW-3(%2.5): Section 4,5

4- HW-4(%2.5): Section 6,7

5- HW-5(%2.5): Section 8

Each homework will have 2 questions, and the solutions will be submitted before the

examinations. However, the homeworks may not be graded before the related examinations.

You are expected to cooperate during preparation of the homeworks. However, you should

not directly copy homeworks from your friends. In those situations the student copying the

homework and the student allowing his/her homework to be copied will be severely

penalized. !!!

2 Midterm examinations:

1st MD: Sections 1,2,3 (%25)

2nd MD: Sections 4,5,6 (%30)

Final examination: % 35

All sections

Note on the grading policy:

No photocopy is allowed

Closed books

Open class notes

Open formula sheets (no limit)