Objectives and competences
to provide detailed theoretical knowledge for fatigue strength of structures;
to provide general approaches for fatigue design of machine parts and structures;
to provide general characteristics and use of fracture mechanics;
to provide detailed knowledge for designing and dimensioning of dynamically loaded welded structures;
to demonstrate practical use of previously accumulated theoretical knowledge on the practical examples;
to further develop student's capabilities of independent thinking and creative solutions of engineering problems in regard to dimensioning of structures.
Content (Syllabus outline)
Lectures:
Introduction and overview. Cyclic deformations. Fatigue crack initiation in ductile and brittle solids. Fracture of materials. Brittle and ductile fracture. Fracture in transition region from ductile to brittle fracture. Low Cycle Fatigue (LCF). Parameters influencing the fatigue of materials (microstructure of the material, size effect, surface finish, frequency of loading, residual stresses, mean stress effect, notches and their effects, variable amplitude loading, multiaxial stresses, environmental effects). Linear elastic fracture mechanics (LEFM). Elastic-plastic fracture mechanics (EPFM). Stress intensity factor. Plastic zone around crack tip. Crack tip opening displacement (CTOD). J-integral. Applicability of different fracture mechanics parameters regarding to fracture behaviour of material. Crack driving force. Resistance curve. Fatigue crack growth. Parameters influencing the fatigue crack growth. Theory of short fatigue crack growth. Crack growth in inhomogeneous materials. Structure integrity assessment procedures (SINTAP, R6, BS 7910).
Learning and teaching methods
frontal lectures,
coursework,
practical work at lab work,
seminar (project) work.
Intended learning outcomes - knowledge and understanding
knowledge of general principles to dimensioning of dynamic loaded structures;
knowledge of fundamental approaches to fatigue design (stress approach, deformation approach, fracture mechanics approach);
knowledge of main parameters influencing the fatigue of materials;
knowledge of basic principles for designing and dimensioning of dynamically loaded welded structures;
understanding of relationships between different skills and procedures and importance of professional literature and computer systems for efficient solutions of engineering problems.
Intended learning outcomes - transferable/key skills and other attributes
combined use of different fundamental skills for solution of engineering problems;
general principles of dimensioning of dynamic loaded structures.
Readings
S. Glodež, J. Flašker: Dimenzioniranje na življenjsko dobo, znanstvena monografija, Univerza v Mariboru, 2006.
N. Gubeljak: Celovitost konstrukcij, Fakulteta za strojništvo, 2005.
I. S. Stephens, A. Fatemi, R. R. Stephens, H. O. Fuchs: Metal Fatigue in Engineering, John Wiley & Sons, 2001.
S. Suresh: Fatigue of Materials, Cambridge University Press, 1998.
D. Radaj: Ermüdungsfestigkeit, Springer Verlag, Heidelberg, 2003.
T. Lassen, R. Recho: Fatigue life analysis of welded structures, ISTE, 2006.
N. Gubeljak: Mehanika loma, Fakulteta za strojništvo, Maribor, 2009.
Prerequisits
Preliminary knowledge in Engineering Design and Mechanics.
Additional information on implementation and assessment • seminar work 20%,
• written exam calculus 20%,
• theoretical part 1 (fracture mechanics and loading capacity) writing form for oral 30%
• theoretical part 2 (strain-life approach) 30%
