Journal
ENGINEERING FRACTURE MECHANICS
Volume 252, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.107847
Keywords
Quasi-brittle solids; Dynamic failure; Phase-field damage model; Rate-dependence; Viscosity
Categories
Funding
- National Natural Science Foundation of China [51538010]
- Education Commission of Shanghai China [2017-01-07-00-07-E00006]
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The newly developed phase-field damage model can effectively characterize the dynamic failure process of quasi-brittle solids, with good agreement between numerical predictions and experimental results.
In recent years, phase-field theory has become an efficient approach for predicting damage and fracture of engineering materials. However, the rate-dependence of quasi-brittle materials is not considered in most exiting models. To address this issue, we develop a new phase-field damage model for the dynamic failure of quasi-brittle solids based on the microforce balance law, within which a linear viscoelastic constitutive relation in effective stress space and a hyperbolic phasefield evolution equation are incorporated. Then several representative numerical examples are presented to demonstrate the ability of the proposed model in characterizing the dynamic failure process of quasi-brittle solids. Good agreements are achieved between numerical predictions and theoretical and experimental results. In particular, the increase of tensile strength and the transition of failure modes of concrete-like materials with the increase of loading rates can be well reproduced.
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