Fracture Mechanics 1

Course guarantor:

Jiří Kunz

Lecturer:

Jiří Kunz

Tutor:

Jiří Kunz

Supervisor:

Department of Materials

Synopsis:

Abstract:

Mechanisms and modes of fracture. Stress and strain field in the vicinity of notch or crack tip. Parameters of linear elastic fracture mechanics. Total energy balance approach. Fracture toughness of materials and crack stability examination. Application in research and engineering practice.

Requirements:

Syllabus of lectures:

Outline:

1.Fracture modes and crack growth mechanisms

2.Stress and strain field around notches and cracks - theoretical background

3.Loading of cracked body - opening, sliding, and tearing modes, criterion of crack stability

4.Stress intensity factor - definition, calculation, influence of finite dimensions of body, boundary conditions, etc., fracture toughness - significance in practice, standard testing methods

5.Crack tip plastic zone under plane stress and plane strain conditions - analytical calculation and experimental determination of size and shape

6.Total energy balance approach - energy release rate, Griffith's criterion, R-curves

7.Sih's strain energy density factor - mixed mode problem, prediction of crack growth direction

8.Relations between parameters of linear elastic fracture mechanics

9.Examples and case studies

Keywords:

crack, fracture mechanisms, stress and strain fields, stress concentration, linear fracture mechanics, stress intensity factor, fracture toughness, crack driving force, R-curves, plastic zone, strain energy density factor

Syllabus of tutorials:

Study Objective:

Study materials:

Key references:

[1] Anderson, T.L. Fracture Mechanics. Fundamentals and Applications. 4th Ed. Boca Raton, CRC Press 2017.

[2] Dowling, N.E. Mechanical behavior of materials: engineering methods for deformation, fracture, and fatigue. 4th Ed. Boston, Pearson 2012.

Recommended references:

[1] Murakami, Y. et al.: Stress Intensity Factors Handbook. Oxford, Pergamon Press 1987.

Media and Tools:

Calculator or Notebook.

Note:

Time-table for winter semester 2024/2025:

	06:00–08:0008:00–10:0010:00–12:0012:00–14:0014:00–16:0016:00–18:0018:00–20:0020:00–22:0022:00–24:00
Mon
Tue
Wed
Thu	roomTR:341 Kunz J. 10:00–11:50 (lecture parallel1) Trojanova 13
Fri

Time-table for summer semester 2024/2025:

Time-table is not available yet

The course is a part of the following study plans:

• Fyzikální inženýrství materiálů (compulsory course in the program)