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AE 310 AEROSPACE STRUCTURAL ANALYSIS SPRING 2013

Tuesday and Thursday, 12:30 pm to 1:45 pm

Engineering Building, Room E 328

SYLLABUS & CLASS POLICY

Catalog description: Methods of static structural analysis of problems encountered in the flight of

aerospace vehicles.

Prerequisites: Required: Civ E 301 or ME 304 (or equivalent mechanics of materials course).

Recommended: Completion or concurrent registration in ME 240 (Intro to

Materials Science) & Civ E 302 (Mechanics of Materials Lab).

Instructor: Dr. Satchi Venkataraman, Associate Professor of Aerospace Engineering, Room

309 Engineering Building, (619) 594 6660, satchi@mail.sdsu.edu

Office hours: TBA.

Website: http://blackboard.sdsu.edu.

Objectives Teach fundamentals of structural analysis and design with emphasis on

aerospace applications.

Textbook: Required: Advanced Mechanics of Materials, Arthur P. Boresi and Richard J.

Schmidt, Sixth edition, John Wiley and Sons, Inc., 2003.

References: 1. Aircraft Structures, D. J. Peery, Dover Publications, 2011.

2. Theory and Analysis of Flight Structures, R. W. Rivello, McGraw Hill, 1969.

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

4. Analysis and design of flight vehicle structures, E. F. Bruhn, Tri-State Offset

Co., 1965.

5. Aircraft Structures for Engineering Students, T. H. G. Megson, Third Edition,

Elsevier, 1999.

Course Topics: Introduction – aircraft structures and materials (2 hrs)

1. Introduction to theory of elasticity (8 hours)

2. Energy methods (3 hrs)

3. Torsion of circular & non-circular- solid and thin walled structures (3 hours)

4. Bending of beams with non-symmetric cross-sections (4 hours)

5. Shear stress in beams subjected to transverse bending loads (6 hours)

6. Analysis and design of thin-walled pressure vessels (1 hour)

7. Failure criteria for isotropic materials (3 hours)

8. Introduction to concepts of fatigue and fracture (6 hours)

9. Elastic buckling of beams and plates (3 hours)

Grading: Grades will be determined using these weights:

1. Homework, Quizzes in class & Projects 30% ; Two in class exams during the

term 40%; Final Exam 30%

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Lecture sessions There will be two seventy five minutes lectures every week.

Attendance is mandatory. More than three unexcused absences can lead to

grade penalty.

Students are expected to come to class on time, turn off their cell phones,

pagers, etc. before the start of class. Use of, portable computers, laptops, tablets

are allowed only for note taking purposes.

Please do not bring or consume food during lectures.

Student participation in class is encouraged to maximize the learning

opportunity. Active participation in class lectures and coming prepared to

lectures will maximize your learning in the class room and minimize the time

you will have to invest outside the class room in studying for this course. Class

participation will be used in deciding borderline grades. Be courteous to the

fellow students and the instructor during classroom discussions.

The use of laptop is not allowed in the classrooms without the permission of

the instructor. Disregard for these rules or other disruptive behavior can lead to

the following sanctions: expulsion, disciplinary sanctions, grade penalty.

Recording lectures (audio and/or video) electronically is not permitted.

Rules for Homework Assignments

Homework assignments are an essential component for learning in this course.

Assignments are chosen to help you review the concepts learned in class and

become familiar with applying it to solving structural analysis problems.

Homework assignments are intended to develop written technical

communication skills.

Present your solution and progression of the ideas in solution process using

appropriate level of explanations.

Each problem in the assignment must start on a new page. Write only on one

side of the paper.

Reproduce the problem statement and any figure accompanying the problem

statement.

Draw neatly all necessary figures and free body diagrams needed for your

computations.

Homework assignments can be handwritten or typed.

Handwritten assignments must be completed on engineering computation

paper and must be neat and legible.

Assignment submitted will not be graded if they are not neat, legible and easy

to follow.

In class quizzes will be based on homework assignments (10-15 minutes long).

Only a small subset of problems will be graded in detail for HW grades.

In-Term Exams: In-class exams will be closed book and closed notes.

Final Exam: The final exam will be comprehensive and will be closed book and closed notes.

Course Outcomes: On completing this course students must be able to:

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1. Demonstrate knowledge of the fundamental equations of linear elasticity.

2. Distinguish between strength of materials and elasticity approach to

structural analysis, and Deduce limitations of different analysis models

based on assumption made in their derivations.

3. Understand derivations of analytical models for elastic response of simple

structures obtained using strength of material and theory of elasticity

concepts.

4. Apply energy methods to compute deformation of statically determinate

and indeterminate trusses and beams.

5. Compute shear stresses and twist angles in torsion for solid sections, closed

thin-walled sections and open thin-walled sections .

6. Compute bending stresses and deflections of beams with non-symmetrical

cross-sections.

7. Understand concept of shear flow and shear center in thin walled beam

structures under torsion and bending loads.

8. Apply different failure criterion to predict failure given the stress state of a

body.

9. Predict critical loads for buckling of beam columns and plate structures.

10. Document structural analyses and design solutions for technical reports.

Students with Disabilities

Students with disabilities are encouraged to contact the Office of Student

Disability Services to make suitable accommodations.

Academic honesty: SDSU Student conduct code (http://csrr.sdsu.edu/conduct1.html) expects all

students to be honest in all academic work. Academic honesty requires that you

acknowledge any source of information that you have used for materials

submitted for credit. Failure to comply with this commitment will result in

disciplinary action. You will be guilty of plagiarism if you present someone

else’s work as your own, even with the other person’s consent; using sources

not approved by the instructor in completing course assignments, not citing

sources from which you took information to complete your assignments, and

reports. Any plagiarism will be immediately reported to the SDSU Judicial

Procedures Office and result in expulsion from the course.

Miscellaneous Only University approved excuses for absences will be accepted. Each student

will be responsible for knowledge of all scheduling and announcements made

in class, via blackboard or email

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AE 310 Aerospace Structural Analysis

Spring 2013 – Tentative Schedule

Date Topics Reading Assignments

1 1/17 Introduction – Aircraft structures Handouts: Navy Mechanics Manual

2 1/22 Review of Statics and Mechanics of materials Class Notes:

3 1/24 Review of Statics and Mechanics of materials Ch 1: Boresi

4 1/29 Stress at a point in 3D & Equilibrium Boresi, 2.1 – 2.3.

5 1/31 Principal stresses Boresi, 2.4 – 2.5:

6 2/5 Deformation and Strains Boresi, 2.6-2.7

7 2/7 Strains and Strain Rosettes Boresi, 2.8, 2.9

8 2/12 Internal energy & Hooke’s Law Boresi, 3.1 – 3.3

9 2/14 Thermo elasticity of Isotropic materials Boresi, 3.4: Boresi

10 2/19 Torsion of Circular bars Boresi, 6.1

11 2/21 St. Venant’s solution, torsion of non-circular shapes Boresi, 6.2-6.3;

12 2/26 Torsion of rectangular sections Boresi, 6.4-6.6

13 2/28 Torsion of hollow thin wall members. Single and Multiply connected cross-sections

Boresi, 6.7

14 3/5 Bending of symmetric beams – review & Exam 1 review

15 3/5 First in-Term Exam

13 3/7 Bending of beams Boresi: 7.1;

16 3/12 Stresses in non-symmetrical beams Boresi: 7.2;

17 3/14 Deflection of beams under non-symmetrical bending Boresi: 7.3

18 3/19 Shear Stresses in Beams, and shear in thin wall beams Boresi 8.1, 8.2

19 3/21 Shear center for channel section Boresi 8.3:-8:4,

20 3/26 Shear center for beams with skin-stringer design Boresi 8.4

21 3/28 Shear center of box beams & Exam 2 review Boresi 8.5

21 4/2 & 4/4

** Spring break **

23 4/9 Introduction to Material Failure Boresi 4.1-4.2;

24 4/11 Models for Yield Criteria Boresi 4.3-4.4

25 4/16 Fracture Criteria Boresi 15.1-15.2

26 4/18 Second in-term exam

26 4/23 Fracture Criteria & Crack Propagation Boresi 15.1-15.3

26 4/25 Cyclic Loading and Fatigue; Stress Concentrations Boresi 16.1 – 16.3

27 4/30 Low Cycle fatigue Boresi 16.4

29 5/2 Buckling of Beams Boresi 12.2-12.3

30 5/7 Buckling of Plates Notes

5/16 Final Exam (10:30-12:30 am)