TY - JOUR
T1 - Effects of grain boundary heterogeneities on creep fracture studied by rate-dependent cohesive model
AU - Yu, Chi Hua
AU - Huang, Chang Wei
AU - Chen, Chuin Shan
AU - Gao, Yanfei
AU - Hsueh, Chun Hway
N1 - Funding Information:
The research was supported by AFOSR Grant No. FA9550-09-1-0200, National Science Council, Taiwan under Contract No. NSC100-2218-E-002-014, and National Science Foundation CMMI 0926798. We are grateful to the National Center for High-performance Computing and Simutech Solution Corporation for providing the computational resources. We would also like to express our sincere gratitude to Professors Ken White and P. Sharma (University of Houston), P. Onck (University of Groningen), and P.F. Becher (University of Tennessee) for their enlightening comments and discussions.
PY - 2012/10
Y1 - 2012/10
N2 - To simulate creep fracture of ceramics at high temperatures, we have developed a user-defined element (UEL) subroutine and a user-defined material properties (UMAT) subroutine to analyze the rate-dependent cohesive behavior of the grain boundary and the creep deformation of the grain, respectively, and implemented them in ABAQUS. The model presented here accounts for grain boundary sliding, nucleation of grain boundary cavities, their growth by diffusion and creep, and link up of microcracks to form macrocracks. Numerical examples demonstrate that the rate-dependent cohesive element has a better numerical stability than the existing work and the entire cavity growth process can be simulated. Also, in the presence of grain boundary heterogeneities, stress distribution becomes localized which, in turn, induces localized grain boundary cavitation and promotes creep fracture.
AB - To simulate creep fracture of ceramics at high temperatures, we have developed a user-defined element (UEL) subroutine and a user-defined material properties (UMAT) subroutine to analyze the rate-dependent cohesive behavior of the grain boundary and the creep deformation of the grain, respectively, and implemented them in ABAQUS. The model presented here accounts for grain boundary sliding, nucleation of grain boundary cavities, their growth by diffusion and creep, and link up of microcracks to form macrocracks. Numerical examples demonstrate that the rate-dependent cohesive element has a better numerical stability than the existing work and the entire cavity growth process can be simulated. Also, in the presence of grain boundary heterogeneities, stress distribution becomes localized which, in turn, induces localized grain boundary cavitation and promotes creep fracture.
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U2 - 10.1016/j.engfracmech.2012.04.034
DO - 10.1016/j.engfracmech.2012.04.034
M3 - Article
AN - SCOPUS:84865432585
SN - 0013-7944
VL - 93
SP - 48
EP - 64
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
ER -