TY - JOUR
T1 - A robust peridynamic computational framework for predicting mechanical properties of porous quasi-brittle materials
AU - Gu, Xin
AU - Li, Xing
AU - Xia, Xiaozhou
AU - Madenci, Erdogan
AU - Zhang, Qing
N1 - Funding Information:
The authors appreciate the financial support from the National Natural Science Foundation of China (Nos. 11932006, U1934206), the Fundamental Research Funds for the Central Universities (B210201031), and the National Natural Science Foundation of China (Nos. 12002118, 12172121).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Prediction of the macroscopic mechanical properties and damage evolution of cement paste is significant; however, it poses challenges due to the complex multiphase heterogeneity and porosity of the hydration microstructure. This study presents a robust implicit-explicit hybrid computational framework based on the bond-based peridynamics for predicting crack evolution and macroscopic mechanical properties of porous quasi-brittle materials. Specifically, the prototype micro-elastic brittle (PMB) material model is improved by considering an attenuation kernel function and surface effect correction. Subsequently, an efficient implicit-explicit hybrid approach is developed for the solution of the strong form of peridynamic equation of motion. A critical damage index of the global system is specified to switch the solver from implicit to explicit. CEMHYD3D software is employed to generate the microstructure of hydration under uniaxial tension. Systematic simulations of the microstructure explain the influence of several computational strategies on the results, i.e., the approach of boundary enforcement, the geometry of porous microstructure, the loading rate in the explicit stage, and breaking the bonds across the voids or not. The simulations demonstrate that applying the improved bond-based peridynamic solver on hydration microstructures can capture their cracking behavior and macroscopic mechanical properties, e.g., stress–strain curve, peak stress, maximum tensile strain, Young's modulus, and fracture energy release rate. This study also paves the way for peridynamic multiscale modeling of cement-based materials.
AB - Prediction of the macroscopic mechanical properties and damage evolution of cement paste is significant; however, it poses challenges due to the complex multiphase heterogeneity and porosity of the hydration microstructure. This study presents a robust implicit-explicit hybrid computational framework based on the bond-based peridynamics for predicting crack evolution and macroscopic mechanical properties of porous quasi-brittle materials. Specifically, the prototype micro-elastic brittle (PMB) material model is improved by considering an attenuation kernel function and surface effect correction. Subsequently, an efficient implicit-explicit hybrid approach is developed for the solution of the strong form of peridynamic equation of motion. A critical damage index of the global system is specified to switch the solver from implicit to explicit. CEMHYD3D software is employed to generate the microstructure of hydration under uniaxial tension. Systematic simulations of the microstructure explain the influence of several computational strategies on the results, i.e., the approach of boundary enforcement, the geometry of porous microstructure, the loading rate in the explicit stage, and breaking the bonds across the voids or not. The simulations demonstrate that applying the improved bond-based peridynamic solver on hydration microstructures can capture their cracking behavior and macroscopic mechanical properties, e.g., stress–strain curve, peak stress, maximum tensile strain, Young's modulus, and fracture energy release rate. This study also paves the way for peridynamic multiscale modeling of cement-based materials.
KW - Cement paste
KW - Macroscopic mechanical property
KW - Peridynamics
KW - Quasi-brittle fracture
KW - Uniaxial tension
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U2 - 10.1016/j.compstruct.2022.116245
DO - 10.1016/j.compstruct.2022.116245
M3 - Article
AN - SCOPUS:85139291760
SN - 0263-8223
VL - 303
JO - Composite Structures
JF - Composite Structures
M1 - 116245
ER -