Aerospace structural Analysis

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:

V-n diagram for design study
Critical loading performance and final V-n graph calculation
Gust and maneuverability
Structural design study- Theory approach
Load estimation of wings
Wing spar and stringer calculation
Wing shear flow calculation
Load estimation of fuselage
Fuselage shear flow calculations
Design of miscellaneous members
Detailed structural
Design and manufacture the structure (use composite material)
Complete the documentation

Text Books:

M.G. Megson, “Aircraft Structures for Engineering Students”, Fifth edition, Butterworth‐ Heinemann, 2012.
H. Bruhn, “Analysis and Design of Flight Vehicles Structures”, Tri‐state off‐ set company, USA, 1985.
J. Peery and J.J. Azar, “Aircraft Structures”, 2nd edition, McGraw – Hill, N.Y., 1999.
Timoshenko and D.H. Young, “Elements of strength materials Vol. I and Vol. II"., T. Van Nostrand Co‐Inc Princeton‐N.J. 1990.

Reference Books:

K. Donaldson, "Analysis of Aircraft Structures ‐ An Introduction", Second edition, Cambridge University Press, 2012.
Howard D Curtis, ‘Fundamentals of Aircraft Structural Analysis’, WCB‐ McGraw Hill, 1997.
M. Rivello, “Theory and Analysis of Flight Structures”, McGraw Hill, 1993.

Source of reference; NSQF