A chemo-mechanically coupled model for capsule-based self-healing polymer materials. (July 2019)

• Record Type: Journal Article
• Authors: Tian, Fang; Zhong, Zheng; Pan, Yihui
• Is Part Of: International journal of damage mechanics. Volume 28:Number 7(2019)
• Page Start: 1075
• Page End: 1094
• Publication Date: 2019-07
• Subjects: Self-healing -- chemo-mechanics -- elasto-plastic deformation -- damage-healing model -- chemical reaction; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1177/1056789518812979
• Languages: English
• ISSNs: 1056-7895

Abstract

In this paper, a chemo-mechanically coupled model for capsule-based self-healing polymer materials has been proposed within a thermodynamic consistent framework. Elasto-plastic deformation, mechanical deterioration due to plastic damage and recovery resulting from the release of healing agents are all considered. By introducing a variable representing the extent of chemical reaction associated with healing agents, we are able to describe the healing behavior of self-healing materials from chemical kinetics. The Helmholtz free energy function and the evolution equations for the damage and the healing processes are specified. The proposed model offers a novel viewpoint to the establishment of damage-healing models by incorporating chemo-mechanical couplings. Taking the dicyclopentadiene-filled microcapsules and Grubbs' catalyst-embedded self-healing epoxy matrix composite as an example, we discuss the effects of temperature, loading conditions, and initial damage on the evolution of damage-healing and the mechanical performance of self-healing materials.