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| Content Provider | Springer Nature Link |
|---|---|
| Author | Tanna, Vijesh Wetzel, Casey Henning Winter, H. |
| Copyright Year | 2017 |
| Abstract | For soft solids with their low modulus, small stress already results in large strain, which may cause nonlinearity and yielding. These potentially competing effects were studied on a clay/polybutadiene (clay/sPB) composite, which is a soft physical gel. Structural changes were introduced by oscillatory shear using large amplitude (LAOS). LAOS beyond a critical limit reduced the internal connectivity. This softened the already soft solid even further, thereby moving it closer to its physical gel point. For clay/sPB, the shear-induced changes were irreversible so that they could get probed using small amplitude shear (SAOS) frequency sweeps. Sequences of SAOS-LAOS-SAOS (SLS) where repeated with increasing LAOS amplitude and increasing duration. The flow-induced structural changes in the soft solid were attributed to yielding, which began to occur at about the same stress/strain values as found for the onset of nonlinearity in traditional SAOS to LAOS (StL) stress amplitude sweeps. The onset of nonlinearity and the yielding seem to be a strain activated process since the characteristic strain amplitude is independent of frequency and temperature, but not so for the characteristic stress amplitude. The duration of LAOS in a SLS experiment beyond yielding is an important parameter since flow-induced structural changes require time to grow. |
| Starting Page | 527 |
| Ending Page | 537 |
| Page Count | 11 |
| File Format | |
| ISSN | 00354511 |
| Journal | Rheologica Acta |
| Volume Number | 56 |
| Issue Number | 6 |
| e-ISSN | 14351528 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2017-04-20 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Yield stress Linear viscoelasticity Oscillatory shear Nonlinearity Reverse gelation Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Mechanics of Materials Condensed Matter Physics Materials Science |
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