A phase-field regularized cohesive zone model for quasi-brittle materials with spatially varying fracture properties

2021 ◽  
pp. 107977
Author(s):  
Hui Li ◽  
Zhen-jun Yang ◽  
Bei-Bei Li ◽  
Jian-ying Wu
Keyword(s):  
Phase Field ◽  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Brittle Materials ◽  
Zone Model ◽  
Fracture Properties ◽  
Spatially Varying

scholarly journals Crack propagation in quasi-brittle materials by fourth-order phase-field cohesive zone model

2022 ◽  
pp. 103236
Author(s):  
Khuong D. Nguyen ◽  
Cuong-Le Thanh ◽  
Frank Vogel ◽  
H. Nguyen-Xuan ◽  
M. Abdel-Wahab
Keyword(s):  
Crack Propagation ◽  
Fourth Order ◽  
Phase Field ◽  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Brittle Materials ◽  
Zone Model

Existence and Convergence Questions in Computational Modelling of Crack Growth in Brittle and Quasi-Brittle Materials

2016 ◽  
Vol 258 ◽  
pp. 157-160 ◽  
Author(s):  
Jiří Vala
Keyword(s):  
Crack Growth ◽  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Computational Modelling ◽  
Brittle Materials ◽  
Zone Model ◽  
Static Tests ◽  
Materials Used ◽  
Proper Analysis

Computational modelling of the crack growth in brittle and quasi-brittle materials used in mechanical, civil, etc. engineering applies the cohesive zone model with various traction separation laws; determination of micro-mechanical parameters comes then from static tests, microscopic observation and numerical calibration. Although most authors refer to ill-possedness and need of artificial regularization in inverse problems (identification of material parameters), some difficulties originate even in nonlinear formulations of direct and sensitivity problems. This paper demonstrates the possibility of proper analysis of the existence of a weak solution and of the convergence of a corresponding numerical algorithm for such model problem, avoiding non-physical assumptions.

scholarly journals Modeling the Ductile Brittle Fracture Transition in Reactor Pressure Vessel Steels Using a Cohesive Zone Model Based Approach

2013 ◽  
Author(s):  
Pritam Chakraborty ◽  
S. Bulent Biner
Keyword(s):  
Crack Growth ◽  
Pressure Vessel ◽  
Cohesive Zone ◽  
Fracture Behavior ◽  
Cohesive Zone Model ◽  
Pressure Vessels ◽  
Reactor Pressure Vessel ◽  
Zone Model ◽  
Fracture Properties ◽  
Reactor Pressure

Fracture properties of Reactor Pressure Vessel (RPV) steels show large variations with changes in temperature and irradiation levels. Brittle behavior is observed at lower temperatures and/or higher irradiation levels whereas ductile mode of failure is predominant at higher temperatures and/or lower irradiation levels. In addition to such temperature and radiation dependent fracture behavior, significant scatter in fracture toughness has also been observed. As a consequence of such variability in fracture behavior, accurate estimates of fracture properties of RPV steels are of utmost importance for safe and reliable operation of reactor pressure vessels. A cohesive zone based approach is being pursued in the present study where an attempt is made to obtain a unified law capturing both stable crack growth (ductile fracture) and unstable failure (cleavage fracture). The parameters of the constitutive model are dependent on both temperature and failure probability. The effect of irradiation has not been considered in the present study. The use of such a cohesive zone based approach would allow the modeling of explicit crack growth at both stable and unstable regimes of fracture. Also it would provide the possibility to incorporate more physical lower length scale models to predict DBT. Such a multi-scale approach would significantly improve the predictive capabilities of the model, which is still largely empirical.

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