• Aviation, Semester 2, position 3

1. introduction to modern approach in stress analysis of composite material structures on aircraft, it's application to practical problems solutions as well as experimental methods applied to structural verifification of composite structures. 2.Introduction to specifics of thin walled structures and application of composite materials for these structures. 3.Introduction to computer simualtion and stress analysis of composite structures on aircrafts.

1. Starting from the mechanical properties of fibers and matrices to calculate the properties of the composite elastic lamina . 2. calculate the load capacity of the composite lamina applying the HILL, Wu and Tsai criteria 3. Using classical laminate theory (CLT) determine stress strain state in composite laminate for a given external load 4. use commercial software for calculation of strength of aircraft composite structures

Basic Definitions. Polymer Matrix and fiber characteristics. Prepregs. Fabrication processes. Autoclave polymerization. Characteristics of composite materials. Elastic stres-strain behavor of composite materials modeling. Plane stress. Principal stresses, principal deformations. Temperatre deformations. Deformations in respect to humidity. Failure Criteria applicable to composite media. Kirchoff and Midlin plate theories. Effective mechanical characteristics of laminates. Composite Beams. Interlaminar stresses. Composite buckling. Delamination, structural analysis of composte material constructuctions using finite element method.

In the practical part of the course, stress-strain theory applicable to composite media is demonstrated. Real practical problems are analyzed. Practical work is carried out using computers and finite element analysis software for composite materials structures. Students are provided with all necessary materials in the form of lecture notes, books and past exam and test papers.

Recommendation: Theory of elasticity, Strucural analysis of aircraft structures

Course notes in electronic form, media materials, computer simulation models available after class, internet resources.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 10
Laboratory exercises: 0
Calculation tasks: 10
Seminar paper: 0
Project: 10
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 5
Test: 0
Test: 5
Final exam: 5

Activity during lectures: 10
Test/test: 20
Laboratory practice: 0
Calculation tasks: 10
Seminar paper: 0
Project: 20
Final exam: 40
Requirement for taking the exam (required number of points): 40

Engineering Mechanics of Composite Materials, D.Ishaii, Oxford Universiy Press 1994; Composite Airframe Structures, Michael Chun-Yung Niu , Michael Niu, Conmilit Press Ltd. 1992