Numerical determination of shear stress relaxation modulus of polymer glasses
| Autor: | Kriuchevskyi, I., Wittmer, J. P., Benzerara, O., Meyer, H., Baschnagel, J. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | EPJE (2017) 40, 43 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epje/i2017-11535-5 |
| Popis: | Focusing on simulated polymer glasses well below the glass transition, we confirm the validity and the efficiency of the recently proposed simple-average expression $G(t) = \mu_A - h(t)$ for the computational determination of the shear stress relaxation modulus $G(t)$. Here, $\mu_A = G(0)$ characterizes the affine shear transformation of the system at $t=0$ and $h(t)$ the mean-square displacement of the instantaneous shear stress as a function of time $t$. This relation is seen to be particulary useful for systems with quenched or sluggish transient shear stresses which necessarily arise below the glass transition. The commonly accepted relation $G(t)=c(t)$ using the shear stress auto-correlation function $c(t)$ becomes incorrect in this limit. Comment: 5 pages, 2 figures. arXiv admin note: text overlap with arXiv:1711.00725 |
| Databáze: | arXiv |
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