| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Understanding and Predicting Dynamic Behavior of Materials
|
| Presentation Title |
Transient State Rheological Behavior of Poly(ethylene glycol) Diacrylate Hydrogels at High Shear Strain Rates |
| Author(s) |
Ke Luo, Kshitiz Upadhyay, Ghatu Subhash, Douglas E. Spearot |
| On-Site Speaker (Planned) |
Douglas E. Spearot |
| Abstract Scope |
Transient rheological properties of poly(ethylene glycol) diacrylate (PEGDA) hydrogels under Couette flow conditions are determined via molecular dynamics simulations and validated by high strain rate shear experiments. The transient shear response is characterized via the introduction of dimensionless variables and the application of a self-similar solution to the power-law fluid model. This enables meaningful comparison across the disparate length and time scales between MD simulations and experiments. The momentum diffusion exponent is found to increase with a decrease in PEGDA concentration, which indicates higher shear-thickening behavior in lower PEGDA concentration hydrogels. Shear-thickening mechanisms in hydrogels are explained by computing the average mesh size and the distribution of junction separations. Two stages of deformation are observed under shear, where the first stage is associated with PEGDA chain conformational changes and the second stage is associated with bond length and angular deviations within PEGDA chains. |
| Proceedings Inclusion? |
Undecided |