Accurate computational modelling for impacts of microcapsule size and interfacial fracture properties on the fracture of self-healing concrete Online publication date: Fri, 18-Nov-2022
by John Hanna
International Journal of Hydromechatronics (IJHM), Vol. 5, No. 4, 2022
Abstract: The fracture of microcapsules in the encapsulation-based self-healing concrete is the most important aspect to release the healing agents and hence heal the cracks. This paper studied computationally the impacts of the microcapsule size and the interfacial fracture proprieties between the microcapsule and the concrete on the fracture mechanism of the self-healing concrete (SHC). The proposed modelling combined the extended finite element method (XFEM) and cohesive surface technique to model the fracture of uniaxial tensile test SHC specimens. When compared to the zero thickness cohesive element approach on the same specimens, the proposed model shows high accuracy in determining load carrying capability and fracture pattern. The interfacial fracture properties and core-shell thickness of the microcapsule determine whether it fractures or debonds. The microcapsule with the thinnest shell is more likely to be fractured.
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