User:Eas4200c.f08.aero.E

 This HW report is not in the right format. There should be a separate wiki page for each HW report with a section with the signature of each contributing team member for that HW report. Here you have a section of contributing team members that is not clear to which HW report it applies. See Team Carbon as an example.

Also a team member did not register (create user account), and the work is threatened to be deleted; see the matlab code section for HW5.

Please fix the above problems immediately.

Do NOT remove this comment box; simply add to this comment box what you have done to fix the above problems.

Eml4500.f08 15:10, 11 November 2008 (UTC)

Solutions:

[Lecture: HW 6] --Eas4200c.f08.aero.E 03:14, 20 November 2008 (UTC)

We are also going to start putting a signature on the items we work one.

Team: Aero

EAS 4200C Aerospace Structures

Professor Vu-Quoc

=Book Preface= The book used for the class is Mechanics of Aircraft Structures by C. T. Sun. We will be using the second edition of the text. The text comes with two prefaces: one for the first edition and another one for the second edition (which is a complement for the first preface). On the preface of the first edition, the author explains the basic knowledge that the student must have in order to have a good understanding of the material covered during class. The book is intended for community of junior and senior level aerospace engineering students with prior knowledge of a mechanics of materials course. The material might be covered in a semester at a decent pace.

The author presents the topics of the book influenced by the recent developments in commercial finite codes which have been used lately in structural analysis. Therefore many ad hoc techniques that were used in the past have lost their usefulness in structural analysis. These recent changes have led to put more emphasis in understanding the mechanics of the structure rather than focus on the problem-solving drill. Another aspect that has influenced the writing of the book is the recent attention put on fracture mechanics, since this tool has became the most important tool in estimating aircraft structure damage tolerance and durability. The author believe that this knowledge (that traditionally was a subject directed to graduate students), is very important for the students to get exposed to. Finally, a third subject of influence for the book has been the recent development and study of advanced composite materials, which is a subject in which students must have contact to the characteristics and properties of such materials. The implementation of Finite Element Method brought with it the use of the consistency elasticity approach. Here, multidimensional stresses, strains, and stress-strain relations are emphasized. Also instead of using strain and stress to derive the equations for torsion and bending, displacement is used. The author uses the concept of Griffith stress energy release rate to bring the concepts of fracture mechanics. In which the strain energy release rate can be calculated for simple structures in a basic way. Composite materials are covered in Chapter 1, anisotropic stress-strain relations in Chapter 2, and in Chapter 8 analysis of symmetric laminates of composite materials is covered. Such coverage of composite materials is believed by the author of the book to be sufficient to give the student a basic background, however; the material covered should not be used as a substitute for a course based on entire composite materials. Elastic buckling is presented in Chapter 7, where sub-topics such as buckling of slender bars, the postbuckling concept and buckling of structures composed of thin sheets are briefly covered. Also, since Postbuckling strengths of bars or panels are so commonly used in aircraft structure, its briefly presentation is justified. Finally, the author appreciates Mrs. Marilyn Engel for typing the manuscript and also James Chou and R. Sergio Hasebe for making the drawings. On the second edition preface the author explains that the purpose of the second edition is to correct some typographical errors as well as to introduce new topics. The newly introduced topics are: primary warping, effects of boundary constraints, Saint-Venant's principle, the concept of shear lag, the Timoshenko beam theory, and briefly introduces the effect of plasticity on fracture. Chapters 1-2 remain unmodified. The modifications concentrate on Chapters 3, 4 and 6, and the number of pages are increased by 25 percent. Finally, and as in the first preface; the author expresses his gratitude to the students and colleagues for pointing out errors and making suggestions, and give special thanks to Dr. G. Huang for assisting him in making new drawings.

=Class Notes=


 * Lectures: HW 1


 * Lectures: HW 2


 * Lectures: HW 3
 * Lectures: HW 4


 * Lectures: HW 5


 * [Lectures: HW 6]


 * [Lectures: HW 7]

=Matlab Projects=


 * Matlab 1: NACA Airfoil


 * Matlab 2: Convergence and Multi Cell


 * Matlab 3: Airfoil and Stringers


 * Matlab Projects assigned for HW 6 and 7 will be in their HW botton.

=Matlab-code certification=

I, the undersigned, certify that I can read, understand, and write matlab codes, and can thus contribute effectively to my team.

Eas4200c.f08.aero.r         --Eas4200c.f08.aero.r 15:38, 19 November 2008 (UTC) Eas4200c.f08.aero.arena     --Eas4200c.f08.aero.arena 05:14, 20 November 2008 (UTC) Eas4200c.f08.aero.gabo28   --Eas4200c.f08.aero.gabo28 20:08, 24 October 2008 (UTC) EAS4200C.F08.AERO.CLK04D   --EAS4200C.F08.AERO.CLK04D 03:47, 24 October 2008 (UTC) Eas4200c.f08.aero.E        --17:06, 23 October 2008 (UTC)Eas4200c.f08.aero.E EAS4200C.Fall08.AERO.Watlington.VG --    EAS4200C.Fall08.AERO.Watlington.VG 17:18, 23 October 2008 (UTC)

=Contributing Team Members=

The following students contributed to this report:

"Eas4200c.f08.aero.r"

"Eas4200c.f08.aero.arena"

"Eas4200c.f08.aero.gabo28"

"EAS4200C.F08.AERO.CLK04D"

"Eas4200c.f08.aero.E"

"EAS4200C.Fall08.AERO.Watlington.VG 17:18, 23 October 2008 (UTC)"