A coupled constitutive model for fracture in plain concrete based on continuum theory with non-local softening and eXtended Finite Element Method
PBN-AR
Instytucja
Wydział Inżynierii Lądowej i Środowiska (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
FINITE ELEMENTS IN ANALYSIS AND DESIGN
ISSN
0168-874X
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
1-21
Numer tomu
114
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Autorzy
Słowa kluczowe
MECHANIKA USZKODZEŃ
NIELOKALNOŚĆ
RYSY
SPRĘŻYSTO-PLASTYCZNOŚĆ
XFEM
Streszczenia
Język
Treść
The paper presents a constitutive model for concrete which combines a continuous and discontinuous fracture description. In a continuum regime, two different constitutive laws were used. First, a plasticity model with a Rankine failure criterion and an associated fl ow rule was used. Second, a constitutive law based on isotropic damage mechanics was formulated. In order to capture the width of a localized zone and to obtain mesh-independent results, both models were equipped with a characteristic length of micro-structure by applying a non-local theory of an integral format. In order to describe a macro-crack as a displacement jump along/across a localized zone, the eXtended Finite Element Method (XFEM) was used. A transition algorithm between a non-local continuum model and XFEM was formulated. The implementation details of a coupled approach were given. The performance of two coupled models were numerically analysed based on several 2D benchmarks with a dominating mode-I (e.g. uniaxial tension and bending) and under mixed-mode conditions. The numerical results were compared with our experimental ones. The advantages of a continuous – discontinuous coupling in describing crack patterns were outlined.
Inne
System-identifier
136891
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