Abstract
Numerical modelling on the compressive response of self-healing polymer foams embedded with novel, bilayered alginate capsules was developed based on the coupled pore fluid diffusion and stress simulations. Micromechanical models were developed to link the damage variable to permeability as well as the saturation to the capillary pressure within damaged polymer foams. These micromechanical models were calibrated against experimental measurements and were implemented into the coupled simulations. To give physical insight into how the damage evolution coupled with the mass conservation, an illustrative example was presented for one-dimensional (1D) compression problem. Two-dimensional (2D) detailed finite element simulations were conducted to interpret the experimental findings. It was demonstrated that the numerical study could capture the main features of the self-healing process. The predicted healing efficiency has good agreement with that measured by the experiments. Based on the numerical models, parameter study was conducted to understand the effects of the key design parameters of the healing system.
Highlights
Self-healing materials, which can repair themselves automatically, have been emerged to provide resilient solutions for critical engineering structures
Capsular self-healing systems are suitable for industrial-scale production with the advantages of easy fabrication, low cost, and versatility (Wang et al, 2015)
The numerical results obtained by the finite difference (FD) calculations have good agreements with those obtained by the finite element (FE) calculations
Summary
Self-healing materials, which can repair themselves automatically, have been emerged to provide resilient solutions for critical engineering structures. For self-healing polymer composites, the self-healing solutions can be achieved through intrinsic and extrinsic self-healing mechanisms (Blaiszik et al, 2010; Wang et al, 2015). Intrinsic self-healing is activated by the parent polymers under external stimuli, including various thermo-mechanical/chemical stimuli (Yu et al 2019). Extrinsic self-healing can be achieved through releasing the prefilled healing agents within either vascular (Trask et al, 2007; Hansen et al, 2011) or capsular (Hia et al, 2016; Al-Mansoori et al, 2017; Sun et al, 2019) containers when damage occurs. Capsular self-healing systems are suitable for industrial-scale production with the advantages of easy fabrication, low cost, and versatility (Wang et al, 2015). Owing to mutually reactive nature, the two-part (http://creativecommons.org/licenses/by/4.0/)
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