Fatigue of Materials

Course guarantor:

Lecturer:

Tutor:

Supervisor:

Department of Materials

Synopsis:

Lectures are concerned with explanation of conditions, causes and mechanisms of fatigue damage, as well as material fatigue characteristics, diagrams, equations and computational algorithms.

Requirements:

Fundamentals of the theory of elasticity, physical metallurgy, theory of probability and mathematical statistics.

Syllabus of lectures:

I. Failure processes - overview.

II. Fatigue of materials.

1. Low-cycle fatigue.

1.1 Cyclic stress-strain curve.

1.2 Crack nucleation.

1.3 Manson-Coffin law.

1.4 Energetic hypothesis (Kliman).

2. High-cycle fatigue.

2.1 Wöhler curve, Smith diagram.

2.2 The effect of surface, size, stress

concentration, environment,

temperature.

2.3 Damage cumulation - Miner

hypothesis.

3. Fatigue crack growth.

3.1 Crack growth laws.

3.2 Interaction effects.

3.3 Models Preffas, Onera, Willenborg,

etc.

4. Cyclic loading.

4.1 Loading cycle and process.

4.2 Markov models.

4.3 Rainflow cycle counting.

5. Statistical evaluation of fatigue

experiments.

5.1 Statistical analysis of lifetime

data.

5.2 Statistical analysis of dependence

v-deltaK.

5.3 Probabilistic models of fatigue

crack growth.

6. Examples: screw, shaft, etc.

Syllabus of tutorials:

Study Objective:

Knowledge: Conditions, causes and mechanisms of fatigue damage. Fatigue parameters, diagrams, equations and computational algorithms.

Skills: computation of fatigue strength and lifetime, design and evaluation of basic fatigue experiments.

Study materials:

Key references:

[1] Schijve J.: Fatigue of Structures and Materials. Dordrecht, Kluwer Academic Publishers 2001, 521 p.

Recommended references:

[1] Laird C.: Fatigue. In: Physical Metallurgy, R.W.Cahn and P.Haasen, eds. Elsevier Science BV, 1996, pp. 2294-2397.

[2] Várkoly L., Zuidema J., Várkolyová B., Chalupová M.: Fatigue Failure of Materials.

TU Delft - Žilinská univerzita, 1998, 235 p.

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans: