|
|
Analýza singularity napětí s bi-materiálovým vrubem
Klusák, Jan ; Knésl, Zdeněk
The article deals with analysis of a stress state in the case of constructions with a bi-material notch. The eigenvalues as well as the stress singularity exponents are determined and discussed for three specific geometries of a bi-material notch and for varying material combinations. The eigenvalues are presented in dependence on Dundurs` composite parameters in so called Dundurs` parallelograms. A numerical example of critical stress estimation is given at the end of the article
|
|
|
Interaction of crack and aggregate in concrete
Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk
Concrete is represented as a two-phase material in this paper. Behaviour of a single macrocrack approaching to the interface between hardened cement paste (matrix) and aggregate (particle) is modelled. It is shown that in the case of where Young modulus of cement paste is greater then those of aggregates, the effective fracture toughness of concrete is predominantly given by fracture properties of aggregates.
|
|
| |
|
| |
|
| |
guest ::
