TY - JOUR
T1 - A STUDY ON PHASE-FIELD MODELS FOR BRITTLE FRACTURE
AU - Zhang, Fei
AU - Huang, Weizhang
AU - Li, Xianping
AU - Zhang, Shicheng
N1 - Funding Information:
F.Z. was supported by China Scholarship Council (CSC) and China University of Petroleum - Beijing (CUPB) for his research visit to the University of Kansas
Publisher Copyright:
© 2022 Institute for Scientific Computing and Information.
PY - 2022
Y1 - 2022
N2 - In the phase-field modeling of brittle fracture, anisotropic constitutive assumptions for the degradation of stored elastic energy due to fracture are crucial to preventing cracking in compression and obtaining physically sound numerical solutions. Three energy decomposition models, the spectral decomposition, the volumetric-deviatoric split, and a modified volumetric-deviatoric split, and their effects on the performance of the phase-field modeling are studied. Meanwhile, anisotropic degradation of stiffness may lead to a small amount of energy remaining on crack surfaces, which violates crack boundary conditions and can cause unphysical crack openings and propagation. A simple yet effective treatment for this is proposed: define a critically damaged zone with a threshold parameter and then degrade both the active and passive energies in the zone. A dynamic mesh adaptation finite element method is employed for the numerical solution of the corresponding elasticity system. Four examples, including two benchmark ones, one with complex crack systems, and one based on an experimental setting, are considered. Numerical results show that the spectral decomposition and modified volumetric-deviatoric split models, together with the improvement treatment of crack boundary conditions, can lead to crack propagation results that are comparable with the existing computational and experimental results. It is also shown that the numerical results are not sensitive to the parameter defining the critically damaged zone.
AB - In the phase-field modeling of brittle fracture, anisotropic constitutive assumptions for the degradation of stored elastic energy due to fracture are crucial to preventing cracking in compression and obtaining physically sound numerical solutions. Three energy decomposition models, the spectral decomposition, the volumetric-deviatoric split, and a modified volumetric-deviatoric split, and their effects on the performance of the phase-field modeling are studied. Meanwhile, anisotropic degradation of stiffness may lead to a small amount of energy remaining on crack surfaces, which violates crack boundary conditions and can cause unphysical crack openings and propagation. A simple yet effective treatment for this is proposed: define a critically damaged zone with a threshold parameter and then degrade both the active and passive energies in the zone. A dynamic mesh adaptation finite element method is employed for the numerical solution of the corresponding elasticity system. Four examples, including two benchmark ones, one with complex crack systems, and one based on an experimental setting, are considered. Numerical results show that the spectral decomposition and modified volumetric-deviatoric split models, together with the improvement treatment of crack boundary conditions, can lead to crack propagation results that are comparable with the existing computational and experimental results. It is also shown that the numerical results are not sensitive to the parameter defining the critically damaged zone.
KW - Brittle fracture
KW - constitutive assumption
KW - critically damaged zone
KW - finite element method
KW - moving mesh
KW - phase-field modeling
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M3 - Article
AN - SCOPUS:85136317479
SN - 1705-5105
VL - 19
SP - 793
EP - 821
JO - International Journal of Numerical Analysis and Modeling
JF - International Journal of Numerical Analysis and Modeling
IS - 6
ER -