EAS 4200C Aerospace Structures

Catalog
information: Credit 3; Prerequisite: EGM 3520

Instructor:
Nam-Ho Kim, Office: 210 MAEA, email: [email-masked],
Phone: 846-0665

Class time &
location: 303 MAEA, MWF 4th period (10:40 – 11:30)

Office hour:
MWF 6th period (12:50 – 1:40)

TAs: William Kurth ([email-masked]),
Kathryn Cason ([email-masked])

Textbook: C.T. Sun, Mechanics of Aircraft
Structures, 2nd edition, John Wiley, 2006.

Course description:
Review of plane states of stress and strain. Analysis of thin-walled beams with
open and closed section. Unsymmetrical bending of wing sections. Torsion of
skin-stringer and multi-cell sections. Flexural shear in open and closed
sections. Shear Center. Failure criteria. Introduction to composite materials. Demonstration of behavior of some simple structural elements.

Course objectives: Teach modern techniques of
structural analysis and design with emphasis on aerospace applications. Develop
communication skills and teamwork skills.

Topics:

Introduction – aircraft structures and materials

Introduction to elasticity

Torsion and bending of
beams

Analysis and design of
thin-walled beams

Failure criteria for isotropic
materials

Elastic buckling

Homework: Homework
must be submitted before starting Friday class. It is likely to have a
quiz based on the homework during the same day class. The worst (or missed) two
homework grades will not be counted toward the final grade.

In-Term Exams: There will be three in-term exams.
All exams are closed book and closed
notes. Students can bring a calculator and 4"x6" formula sheet. There
will be no make-up exams. Unless there is an extreme medical emergency that can
be documented, no credit will be given for a missed exam.

Projects: There
will be two term projects (wing box analysis and fuselage analysis). Projects
must be submitted on time in class. Late projects submitted by next class will
receive 90% credit. Projects received later than that will not be accepted
without medical or other valid reasons.

Grading policy: Exams 45%, Projects 30%, Homework
15%, Quiz 10%. Grades are on an absolute scale (A=93~100, A-=90~92.9, B+=87~89.9, B=83~86.9, B-=80~82.9, C+=77~79.9, C=73~76.9, C-=70~72.9, D+=67~69.9, D=63~66.9, D-=60~62.9, E=0~59.9).

Re-grading policy:
Any re-grade request must be submitted in writing within ONE WEEK after return of the graded paper. The written request must
explain in detail what you want the grade to do and where you believe the
mistake is in grading. Only the instructor will accept these requests.

Course web site:
http://www.mae.ufl.edu/nkim/eas4200c
Students are expected to check it on a regular basis for up-to-date course
information. This may include changes to the syllabus, homework assignment due
dates, and exam schedules.

Class sorting
number: A class sorting number will be assigned to each student, which
should be used in all submissions of homework, projects, exams, and quizzes.

Personal responsibility. You
are personally responsible for all information disseminated during the
lectures. This means knowing all homework due dates, knowing when exams will be
given, where they will be given, what material they will cover, and knowing all
material, handouts, and announcements made in the lectures, whether or not you
were present. Thus, if you miss a lecture, it is your responsibility to obtain
all information presented during that lecture.

Academic
Honesty. All students admitted to the University of Florida
have signed a statement of academic honesty committing themselves
to be honest in all academic work and understanding that failure to comply with
this commitment will result in disciplinary action. This statement is a
reminder to uphold your obligation as a student at the University of Florida
and to be honest in all work submitted and exams taken in this class and all
others.

Accommodations
for Disabilities. Students requesting classroom accommodation
must first register with the Dean of Students Office. That office will provide
the student with documentation that he/she must then provide to the course
instructor when requesting accommodations.

Software Use – All faculty, staff
and student of the University are required and expected to obey the laws and
legal agreements governing software use.
Failure to do so can lead to monetary damages and/or criminal penalties
for the individual violator.
Because such violations are also against University policies and rules,
disciplinary action will be taken as appropriate.  We, the members of the University of Florida
community, pledge to uphold ourselves and our peers to the highest standards of
honesty and integrity.

UF Counseling Services –
Resources are available on-campus for students having personal problems or
lacking clear career and academic goals.  The resources include:

University
Counseling Center, 301 Peabody Hall, 392-1575, Personal and Career
Counseling.

SHCC mental
Health, Student Health Care Center, 392-1171, Personal and Counseling.

Center for
Sexual Assault/Abuse Recovery and Education (CARE), Student Health Care
Center, 392-1161, sexual assault counseling.

Career Resource
Center, Reitz Union, 392-1601, career development assistance and
counseling.

Tentative schedule

Week

Class content

Reading

H/W, Project

1

Introduction; axial, shear, bending, and torsion

Chapter 1

2

Displacement, strain, stress, principal stress, shear
stress, equilibrium

2.1 ~ 2.6

1.1, 1.3, 1.7

3

Stress transformation, stress-strain relation, strain
energy, plane problems

2.7 ~ 2.10

2.1, 2.6, 2.7

4

Uniform-bar torsion, circular/rectangular/closed
sections

3.1 ~ 3.5

2.10, 2.11, 2.17

5

Multi-cell closed section, warping, end constraint

3.6 ~ 4.1

TBD

6

Exam1, Euler beam

4.2

7

bidirectional bending, shear stress, Timoshenko beam,
shear lags

4.3 ~ 4.5

TBD

8

Project1, shear flow, Homecoming (no class)

5.1

TBD

9

Shear center, closed multi-cell sections

5.2 ~ 5.4

TBD

10

Strength/yield criteria, fracture mechanics

6.1 ~ 6.3

Project 1

11

Exam2, stress intensity factor, elastic buckling

6.4 ~ 7.3

12

Post-buckling, unsymmetric
section, Veterans day (no class)

7.4 ~ 7.5

TBD

13

Project 2, torsional-flexural
buckling, plate buckling

7.6 ~ 7.7

TBD

14

Local buckling, composite lamina, Thanksgiving(no
class)

7.8 ~ 8.1

TBD

15

Off-axis loading, symmetric lamina, lamina stress

8.2 ~ 8.7

Project 2

16

Review, Exam3