Deflection of an eccentric crack under mixed-mode
conditions in an SCB specimen
More details
Hide details
1 |
Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics,
Institute of Physics of Materials, Brno, Czech Republic |
2 |
Academy of Sciences of the Czech Republic, Institute of Physics of Materials, Brno, Czech
Republic and Brno University of Technology, Faculty of Civil Engineering, Institute of Structural
Mechanics, Brno, Czech Republic |
3 |
Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics,
Brno, Czech Republic |
4 |
Brno University of Technology, Faculty of Civil Engineering, Institute of Building Testing, Brno,
Czech Republic |
Publication date: 2021-02-12
BoZPE 2020;(2):79–87
KEYWORDS
TOPICS
ABSTRACT
Crack propagation under mixed-mode (I + II) conditions has been investigated in a semicircular
disc where various levels of mixed-mode can be achieved by means of different
geometry configurations. The research has been performed on a novel cementitious material,
alkali-activated concrete. Its main advantage is that it is environment-friendly. On the
other hand, its fracture mechanical properties, as of yet, have not been described sufficiently.
Therefore, a fracture analysis has been performed. The crack deflection under threepoint
bending conditions has been investigated numerically as well as experimentally.
The numerical approach is based on a combination of the common finite element analysis
and a multi-parameter form of the maximum tangential stress criterion. This generalized
method is suitable especially for materials with specific (elasto-plastic, quasi-brittle etc.)
fracture behaviour. The over-deterministic method together with the Williams expansion
is applied to approximate selected stress tensor components around the crack tip. In this
work, the influence of the eccentric crack is also discussed. In the conclusions, several
recommendations about using single-parameter/multi-parameter fracture mechanics are
stated.