Computational Indentation in Highly Cross-linked Polymer Networks

Abstract

Indentation is a common experimental technique to study the mechanics of polymeric materials. The main advantage of using indentation is because this provides a direct correlation between the microstructure and the small-scale mechanical response, which is otherwise difficult within the standard tensile testing. Here, majority of studies have investigated hydrogels, microgels and/or elastomers. However, a lesser investigated system is the indentation in highly cross-linked polymer (HCP) networks, where the complex network structure plays a key role in dictating their physical properties. In this work, we investigate the structure-property relationship in HCP networks using the computational indentation of a generic model. We establish a correlation between the local bond breaking, the network rearrangement, and the small-scale mechanics. The results are compared with the elastic-plastic deformation model. HCPs harden upon indentation.

References in corpus (7)

• Dynamics of Viscoplastic Deformation in Amorphous Solids
• A random critical point separates brittle and ductile yielding transitions in amorphous materials
• Strain Hardening in Polymer Glasses: Limitations of Network Models
• The effect of inertia on sheared disordered solids: Critical scaling of avalanches in two and three dimensions
• Why Do Elastin-Like Polypeptides Possibly Have Different Solvation Behaviors in Water-Ethanol and Water-Urea Mixtures?
• Viscosity Overshoot in Biaxial Elongational Flow: Coarse-Grained Molecular Dynamics Simulation of Ring-Linear Polymer Mixtures
• Tuning thermal transport in highly cross-linked polymers by bond induced void engineering