Mohammad Hossein Moshaei

arXiv2018

On Mechanical Behavior of Elastomeric Networks: Effects of Random Porous Microstructure

An assumption in micromechanical analysis of polymers is that the constitutive polymeric media is non-porous. Non-porosity of media, however, is merely a simplifying assumption. In this paper, we neglect this assumption and studied polymer networks with a different porosity volume fraction. A random morphology description function is used to model the porosity of the network and nonlinear finite element analyses are conducted to perform structural analysis of porous polymer networks. The results show that the porosity effect is significant in mechanical behavior of polymer networks and may increase the maximum Von-Mises stress drastically.

cond-mat.soft↗

arXiv2017

Revisiting the Deformation-Induced Damage in Filled Elastomers: Effect of Network Polydispersity

A priori assumption in micromechanical analysis of polymeric networks is that the constitutive polymer strands are of equal length. Monodisperse distribution of strands, however, is merely a simplifying assumption. In this paper, we relax this assumption and consider a vulcanized network with a broad distribution of strand length. In the light of this model, we predict the damage initiation and stress-stretch dependency in a filled polymer network with random internal structures. The degradation of network mechanical behavior is assumed to be controlled by the adhesive failure of the strands adsorbed to the filler surface. We show that the short adsorbed strands are the culprits for damage initiation and their finite extensibility is a key determinant of mechanical strength.

cond-mat.mtrl-sci↗