Dynamic materials have many benefits that cannot be seen in static materials. They have the ability to dissociate stress, and many can even self-heal. Dissociating stress is a useful property for these materials to have as it can allow more stress to be applied to a system before it fails. The relaxation time can depend on temporary bonds breaking, or the untangling of polymers within the system itself. We proposed a theory that included a time-dependent element in the analysis of stress-strain curves of dynamic materials, thus accounting for the temporary bonds breaking in materials as opposed to just the stretching of bonds. This gives the ability to understand the relaxation time of dynamic materials so that they can be better characterized before being used. The time-dependent term has a second-order time dependence, which was found to predict the relaxation time more accurately and precisely than a first-order dependence. The model was tested out against a wide range of materials, both experimental and taken from the literature, and found to be sensitive and applicable across these materials. This model assists with the characterization of dynamic materials that includes their temporary bonds in the predictions of their behaviors.

Adding transient bonds into hyperelastic models

ACS Fall 2021

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