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Micromechanical modelling of self-healing cementitious materials

Davies, Robert Elfed and Jefferson, Anthony Duncan 2017. Micromechanical modelling of self-healing cementitious materials. International Journal of Solids and Structures 113-4 , pp. 180-191. 10.1016/j.ijsolstr.2017.02.008

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Abstract

A new approach is described for simulating self-healing behaviour in cementitious materials with a two phase micro-mechanical constitutive model. A Mori-Tanaka homogenisation scheme is employed for the composite along with an exterior point Eshelby solution that accounts for stress concentrations adjacent to inclusions. In addition, anisotropic micro-cracking is simulated using arrays of circular cracks. Self-healing is incorporated into the model by using a novel solidification formulation that models healing under both null and non-zero strain conditions. The focus of the present work is on the recovery of mechanical properties of the micro-cracked material. The performance of the 3D micromechanical self-healing model is illustrated using a series of stress-strain paths that involve damage and healing cycles. The implementation of the model in a layered beam model is also described, as are a series of model validations that employed data from a recent test series undertaken at Cardiff University as well as data from tests undertaken by others. The examples and validations show that the new micro-mechanical self-healing model is capable of representing the characteristic mechanical response of self-healing cementitious materials.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: Elsevier
ISSN: 0020-7683
Funders: EPSRC
Date of First Compliant Deposit: 30 March 2017
Date of Acceptance: 7 February 2017
Last Modified: 05 Jun 2017 05:52
URI: http://orca.cf.ac.uk/id/eprint/98642

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