A micromechanically motivated phase-field damage model is proposed to investigate the fracture behaviour in crosslinked polyurethane adhesive. The crosslinked polyurethane adhesive typically show viscoelastic behaviour with geometric nonlinearity. The finite-strain viscoelastic behaviour is modelled using a micromechanical network model considering shorter and longer chain length distribution. The micromechanical viscoelastic network model also consider the softening due to breakage/debonding of the short chains with increase in deformation. The micromechanical model is coupled with the phase-field damage model to investigate the crack initiation and propagation. Critical energy release rate is needed as a material property to solve phase-field equation. The energy release rate is formulated based on the polymer chain network. The numerical investigation is performed using finite element method. The force-displacement curves from the numerical analysis and experiments are compared to validate the proposed material model.
@article{arxiv.2406.05511,
title = {Micromechanically motivated finite-strain phase-field fracture model to investigate damage in crosslinked elastomers},
author = {S. P. Josyula and M. Brede and O. Hesebeck and K. Koschek and W. Possart and A. Wulf and B. Zimmer and S. Diebels},
journal= {arXiv preprint arXiv:2406.05511},
year = {2024}
}