A Phenomenological Model for Shakedown of Tough Hydrogels Under Cyclic Loads
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- A Phenomenological Model for Shakedown of Tough Hydrogels Under Cyclic Loads
- 发表刊物：
- Journal Of Applied Mechanics-Transactions Of The Asme
- 摘要：
- Most tough hydrogels suffer accumulated damages under cyclic loads. The damages may
stem from breakage of covalent bonds, unzipping of ionic crosslinks, or desorption of
polymer chains from nanoparticle surfaces. Recent experiments report that when a tough
hydrogel is subject to cyclic loads, the stress–stretch curves of tough hydrogels change
cycle by cycle and approach a steady-state after thousands of cycles, denoted as the
shakedown phenomenon. In this paper, we develop a phenomenological model to
describe the shakedown of tough hydrogels under prolonged cyclic loads for the first
time. We specify a new evolution law of damage variable in multiple cycles, motivated by
the experimental observations. We synthesize nanocomposite hydrogels and conduct the
cyclic tests. Our model fits the experimental data remarkably well, including the features
of Mullins effect, residual stretch and shakedown. Our model is capable of predicting the
stress–stretch behavior of subsequent thousands of cycles by using the fitting parameters
from the first and second cycle. We further apply the model to polyacrylamide (PAAM)/
poly(2-acrylanmido-2-methyl-1-propanesulfonic acid) (PAMPS) and PAAM/alginate
double-network hydrogels. Good agreement between theoretical prediction and experimental
data is also achieved. The model is hoped to serve as a tool to probe the complex
nature of tough hydrogels, through cyclic loads
- 合写作者：
- Wang, ZT; Tang, JD; Bai, RB; Zhang, WL; Lian, TD; Lu, TQ; Wang, TJ
- 是否译文：
- 否
- 发表时间：
- 2018-06-14