St Wing Flight 4b

Aerospace Engineering AER403B Aircraft Structural Design.doc 1/4

University: Cairo Faculty: Engineering Department: Aerospace

Course Specifications Program: Aerospace Engineering Major Field: Aircraft Structural Design Department: Aerospace Engineering. Academic Year Level: Fourth Year Undergraduate Term: Second Year of Approval: November, 2007.

A- Basic Information Title: Aircraft Structural Design Code: AER403B Credit Hours: 2 Weekly Hours: Lectures 2, Tutorials 2, Total 4 Prerequisite Courses: AER403A (Structural Design of Flight Vehicles A)

B-Professional Information

1-Overall Aims of Course Introduce the student to perform a preliminary fuselage design and then improve this design using the finite element method.

2-Intended Learning Outcomes

A-Knowledge and Understanding Upon completion of this course the student should be able to:

Calculate the buckling strength of a curved sheet Calculate the loads and stresses in frames Analyze the diagonal semi-tension field of curved webs Perform a preliminary fuselage design and calculate MOS Improve this design using the finite element method Design a connection (bolted, riveted and welded) Understand some important details in airframe design

B-Intellectual Skills Upon completion of this course the student should be able to:

Perform a fuselage structural design Checking this design using the finite element method and perform the necessary

modifications Study of the static and dynamic behavior of a structure using a finite element

model with application to fuselage design Structure optimization Design airframe connections Make the necessary modifications at cutouts


C-Professional and Practical Skills Upon completion of this course the student should be able to

Prepare a preliminary fuselage design and analyze the MOS Use a finite element package to analyze deflections, stresses, and study the static

and dynamic behavior of a structure with application to fuselage Fitting design Construction of cutouts Design optimization

3-Course Contents

Topic Lecture Hour Tutorial

Hour Chapter 1: Buckling strength of curved sheets 4 4 Compressive buckling stress of curved sheet panels Buckling strength of curved sheet panels under combined axial compression and shear

Compressive buckling stress of curved sheet panels with internal pressure

Shear buckling stress of curved sheet panels with internal pressure Ultimate strength of stiffened cylindrical structures, Instability Chapter 2: Loads and stresses in frames 3 3 Supporting boundary forces on fuselage frames Types of wing frame construction Stresses in fuselage frames Frame loads due to discontinuities in fuselage skin covering Chapter 3: Diagonal semi-tension field curved web 5 5 Analysis of stringer systems in diagonal tension Allowable stresses (and interactions) Longeron type system Chapter 4: Fittings and connections 4 4 Economy in fitting design Fitting margins of safety, special factors Failure analysis Design of bolted, riveted and welded connections Chapter 5: Some important details in airframe construction 3 3 Shear and tension clips Joggled members and fillers Cutouts in webs or skin panels Chapter 6: Wing stress analysis 13 13 Loads, design considerations and requirements Effective section at failing load


Ultimate bending strength of a tapered unsymmetrical fuselage section

Shear lag influences Fuselage made up of composite materials Case study: Perform a preliminary design of an actual fuselage and improve its static and dynamic behavior using the finite element method

4-Teaching and Learning Methods Board instructions Student discussions Homework problems Discussion of exercise problems Computer laboratory

5-Student Assessment Methods Reports of exercise problems Nastran reports Mid-term exam Final exam

Assessment Schedule Assessment 1 At the end of every chapter Assessment 2 At the mid- term Assessment 3 At the end of the term

Weighting of Assessments Reports 9 % Nastran reports 6 % Mid-Term exam 15 % Oral and lab exam 10 % Final exam 60 %

6- References Bruhn, E.F., Analysis and Design of Flight Vehicle Structures, Tri-State.

Jones, R.M., Mechanics of Composite Materials, Scripta.

Ashton, J.E., J.C. Halpin and P.H. Petit, Primer on Composite Material Analysis, Technomic.

MSC/NASTRAN reference manual


7-Facilities Required for Teaching and Learning Board Exercise sheets Computer laboratory Library

Course Coordinator: Prof. Edward A. Sadek, Professor of Aircraft Structures Head of Department : Prof. Atef Sherif Date: November, 2007.

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St Wing Flight 4b