FACULTY

APPLIED TECHNOLOGIES

DEPARTMENT

AIRCRAFT TECHNOLOGY ENGINEERING

LEVEL OF STUDIES

UNDERGRADUATE

MODULE CODE

AE1220

SEMESTER OF STUDIES

2^ND

MODULE TITLE

ΜECHANICS ΙΙ

INDEPENDENT TEACHING ACTIVITIES

TEACHING HOURS PER WEEK

CREDIT UNITS

Lectures

2

4

Practice

2

0

Workshop

2

2

COURSE TYPE

General Background

PRE-REQUIRED COURSES

TEACHING AND EXAMINATION LANGUAGE

GREEK

THE COURSE IS OFFERED TO ERASMUS STUDENTS

COURSE WEBPAGE  (URL)

Learning Objectives

After successfully completing the course, students should be able to analyze and apply the basic concepts of material strength for the soulution of practical problems that arise during the repair and maintenance procedures of aircraft parts.

General Skills

·                  Search, analysis and combination of data and information, with the use of the necessary technologies.

·                  Indepentend work

·                  Team work

Unit 1: Basic principles of material strength.  Types  of stresses. Types of loadings, Types of carriers. Method of sections.  Microscopic analysis of internal forces. The principle of Superposition. Types of tension and tension situation, tensioner and strain tensioner.

Unit 2:        Tension-deformation relationships. Equations of state in elastic materials. State functions. The concept of symmetry directions. Hooke's generalized law. Hooke's tensioner. Specific cases of symmetry direction materials. Elasticity standards in isotropic materials. Thermal stresses. Mohr cycle for tensions and strains.

Unit 3: Axial Tension- Compression. Tension and compression σ-ε diagram. Elastic and plastic deformation. Modulus. Proportional limit, elastic limit, yield point, plastic deformation, maximum tension, shear point. Ductile and brittle fracture. Hysteresis loop.  Bauschinger effect.

Unit 4:      Shear, flat Intensity and flat deformation. Shear stresses, Shear surface. Rivet shear strain. Lamina strain. 

                  Analysis of the general flat intensity. Flat intensity Mohr cycle. Pure shear. Relationship between E and G

                  elasticity  modulus. Stress orbits and isostatic lines. Analysis of deformations. 

Unit 5:  Bending. Pure and general bending. General analysis of bending. Basic types of bending. Radius of curvature and steering angle. Maximum normal stress. Strength and cross-section calculation. Cross-section use coefficient. Bending of variable cross-section beam. Beam bending with different moduli in tension and compression. Bending of complex beams. Shear in bending beam. Bending main stresses.

Unit 6:        Flexible line. Method of double integration. Method of generalized functions. Method of Superposition. Beam-Mohr's method. Method of bending moment diagrams.

 Unit 7: Torsion. Torsion of cyclical cross-section rod. Torsion of cyclical variable cross-section. Torsion of rod with non cyclical cross-section. Torsion of thin walled tubes. Statically indeterminate torsion problems.

Unit 8:       Buckling. Buckling cases. Euler formula. Critical buckling stress. Εffect of eccentricity. Method of ω

                    coefficients. 

Unit 9:       Double and asymmetric bending. Double bending double symmetrical sections, oblique bending double

                    symmetrical sections, oblique beam bending with random section

 Unit 10:   Impact, fatigue and creep. Propagation of stress waves to elastic means. Dynamic stress and  material mechanical behavior. Fatigue curve. Effect of average stress on fatigue threshold.  Εffect of cracks and notches on fatigue strength. Factors affecting material fatigue strength. Creep, slackening and recovery. Hreologic behavior standards. Creep stages and effect of temperature. 

  Unit 11: Combined stress. General conditions of body equilibrium.  Analysis of the resultant external force. Relationship between internal forces and stresses. Types of combined stresses. Strength check and dimensioning. Strain by eccentic force. Bending and torsion. Axial force, bending and torsion. Torsion, bending and shear. Axial force, torsion, bending and shear.

 Unit 12: Criteria of material failure. Maximum normal stress criterion. Maximum shear stress criterion. Maximum normal strain criterion. Strain energy criterion. Torsional energy criterion. Mohr criterion.  

ΤEACHING METHOD.

Face to face

USE OF INFRORMATION AND COMMUNICATION TECHNOLOGIES

•  Use of Internet

•  Use of e-class platform

TEACHING ORGANIZATION

STUDENT EVALUATION

·                     Written examination in the scheduled examination periods including theory questions, comprehension questions, multiple choice questions and problem solving activities.

·                     Written assignments based on the workshop activities during the semester.

Suggested Bibliography :

•  Βουθούνης , Τεχνική Μηχανική - Αντοχή των Υλικών, 2002,  Κωδικός ISBN: 9608543142

•  Ανδριανόπουλου, Πειραματική αντοχή των υλικών, Εκδ. ΣΥΜΕΩΝ

•  Πρασιανάκης, Εργαστήριο Πειραματικής αντοχής υλικών, Εκδόσεις ΣΥΜΜΕΤΡΙΑ,2004,  ISBN: 9601100059

•  Γκαρούτσος, Μηχανική Παραμορφώσιμου Στερεού ΙΙ - Αντοχή Υλικών, Εκδόσεις SPIΝ, ISBN: 9608250218

•  Χαραλαμπάκης Παπαμίχος, Αντοχή υλικών, Εκδ. ΤΖΙΟΛΑΣ, ISBN: 9604180487

•  Russell C. Hibbeler, Mechanics of Materials, Prentice Hall, 6th edition, 2005

•  James M. Gere, Mechanics of Materials, Nelson Thornes Ltd, 5th edition, 2002

•  Ferdinand Pierre Beer, E. Russell Johnston, John T. Dewolf , Mechanics of Materials with tutorial CD, McGraw Hill Text, 3rd edition, 2002

•  Robert P. Kokernak, Harold Morrow, Statics and Strength of Materials, Prentice Hall College Div, 5th edition, 2004

•  James M. Gere and S.P. Timosenko, Mechanics of Materials, Stanley Thornes Ltd, 4th  edition, 1999

•  Cheng, Statics and Strength of Materials, 1997

•  J. Case, L. Chilver and C. Ross, Strength of Materials & Structures, 1996

•     -Συναφή επιστημονικά περιοδικά: