The large amplitude oscillatory strain response of aqueous foam: Strain localization and full stress Fourier spectrum
The large amplitude oscillatory strain response of aqueous foam: Strain localization and full stress Fourier spectrum
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DOI：
10.1140/epje/i2008-10382-7
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发表时间：
2008-11
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影响因子：
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通讯作者：
F. Rouyer;S. Cohen-Addad;R. Höhler;Peter Sollich;S. Fielding
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文献类型：
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作者：
F. Rouyer;S. Cohen-Addad;R. Höhler;Peter Sollich;S. Fielding
研究了振荡应变作用下含水泡沫的低频应力响应。随着应变振幅从零开始逐渐增加，初始线性粘弹性响应随着屈服而变为非线性。为了定量地表征从固体状到液体状行为的这种交叉，测量应力的全谐波谱。这些结果进行了比较，软玻璃流变模型以及弹塑性模型。此外，为了检查应变局部化，我们使用视频显微镜在库埃特池中的泡沫样品的自由表面处监测气泡的位移分布。这些观察结果表明，应变局部化发生在接近差距的中间，但仅在应变幅度远高于屈服应变。
We study the low frequency stress response of aqueous foams, subjected to oscillatory strain. As the strain amplitude is progressively increased starting from zero, the initially linear viscoelastic response becomes nonlinear as yielding sets in. To characterize this crossover from solid-like to liquid-like behaviour quantitatively, the full harmonic spectrum of the stress is measured. These results are compared to the soft glassy rheology model as well as to elastoplastic models. Moreover, to check for strain localization, we monitor the displacement profile of the bubbles at the free surface of the foam sample in a Couette cell using video microscopy. These observations indicate that strain localisation occurs close to the middle of the gap, but only at strain amplitudes well above the yield strain.