Abstract
In disordered, viscoelastic or viscoplastic materials a sample response exhibits a recoveryphenomenon after the removal of a constant load or after creep. We study experimentallythe recovery in paper, a quasi-two-dimensional system with intrinsic structural disorder.The deformation is measured by using the digital image correlation (DIC) method. By theDIC we obtain accurate displacement data and the spatial fields of deformation andrecovered strains. The averaged results are first compared to several heuristic models forviscoelastic polymer materials in particular. The most important experimental quantity isthe permanent creep strain, and we analyze whether it is non-zero by fitting theempirical models of viscoelasticity. We then present in more detail the spatialrecovery behavior results from DIC, and show that they indicate a power-law-typerelaxation. We outline results on variation from sample to sample and collective,spatial fluctuations in the recovery behavior. An interpretation is provided for therelaxation in the general context of glassy, interacting systems with barriers.
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