Autor: Tejchman, J - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A Non-local hypoplastic constitutive law to describe shear localisation in granular bodies
Autorzy:: Tejchman, J.
Powiązania:: https://bibliotekanauki.pl/articles/240962.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: characteristic length
finite element method
non-local model
plane strain compression
shear localization
Opis:: The paper presents a FE-analysis of shear localisation in granular bodies by a finite element method based on a hypoplastic constitutive law. The law can reproduce essential features of granular bodies depending on the void ratio, pressure level and deformation direction. To realistically simulate the formation of a spontaneous shear zone inside cohesionless sand during plane strain compression, a hypoplastic constitutive law was extended by non-local terms. The effects of initial void ratio, pressure level and a characteristic length on the thickness of an interior shear zone were shown. The numerical results were compared with corresponding laboratory tests.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 4; 359-379
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Simulation of shear localization in granular bodies within gradient-enhanced hypoplasticity
Autorzy:: Tejchman, J.
Powiązania:: https://bibliotekanauki.pl/articles/241309.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: characteristic length
finite element method
gradient model
plane strain compression
shear localization
Opis:: The paper presents a FE-analysis of a spontaneous shear localization inside non-cohesive sand during plane strain compression. The calculations were carried out with a gradient-enhanced hypoplastic constitutive law. The hypoplastic law can reproduce essential features of granular bodies depending on the void ratio, pressure level and deformation direction. To model the thickness of shear zones, a characteristic length of the microstructure was incorporated via the second gradient of the modulus of the deformation rate. To determine the effect of micro-structure, the analysis was performed with different characteristic lengths for the same specimen size.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 3; 243-265
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: A Non-local elasto-plastic model to describe localisations of deformation in concrete
Autorzy:: Bobiński, J.
Tejchman, J.
Powiązania:: https://bibliotekanauki.pl/articles/1986935.pdf
Data publikacji:: 2002
Wydawca:: Politechnika Gdańska
Tematy:: concrete
localisation
non-local theory
elasto-plasticity
characteristic length
Opis:: The paper presents numerical simulations of behaviour of concrete elements subjected to uniaxial compression for plane strain. FE-calculations are performed with two different elasto-plastic constitutive laws for concrete. Numerical results obtained suffer from mesh sensivity due to the presence of material softening. To obtain a well-posed boundary problem and a mesh independent solution, conventional constitutive laws with softening require an extension (called regularisation) to describe properly the localisations of deformations. In this paper elasto-plastic constitutive laws are extended by non-local strain terms. Owing to them, localisations of deformations are realistically captured.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 3; 437-446
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Modelling of concrete behaviour with a non-local continuum damage approach
Autorzy:: Bobiński, J.
Tejchman, J.
Powiązania:: https://bibliotekanauki.pl/articles/241347.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:: characteristic length
concrete
crack
damage model
FEM
non-local theory
Opis:: The paper presents FE-results on the behaviour of concrete under plane strain conditions. The material was modelled using a simple isotropic damage continuum model. The model was enriched by non-local terms to avoid a pathological mesh-sensitivity and to obtain a well-posed rate boundary value problem. The constitutive model was used to simulate localization of deformation in 3 benchmark problems: a double-edge notched specimen under uniaxial tension and a notched beam under three- and four-point bending. Attention was laid on the effect of a characteristic length on the load-displacement curves and strain localization. The FE-results were compared with experiments and other numerical studies.
Źródło:: Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 3; 243-263
1231-3726
Pojawia się w:: Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:: Biblioteka Nauki

Artykuł

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