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arXiv 2409.04725cond-mat.soft
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二维软玻璃:振荡剪切下的屈服

Two-dimensional squishy glass: yielding under oscillatory shear

Sayantan Ghosh, Rahul Nayak, Satyavani Vemparala, Pinaki Chaudhuri

AI总结:

该研究模拟由可变形聚合物环构成的二维致密玻璃,考察环刚度如何影响振荡剪切下的形状涨落、屈服应变及平移重排。

摘要:

本文研究了由双分散、可变形聚合物环组成的二维致密玻璃模型在施加振荡剪切时的屈服响应,并以环的刚度作为控制参数。在静止玻璃态下,更柔韧的环表现出更宽的形状涨落谱,而随着环刚度增加,这种涨落逐渐受到约束。在剪切作用下,高度堆积的环发生屈服,即热组装体失去刚性,且阈值屈服应变随着环刚度降低而显著增大。此外,与未受剪切的对应体系相比,这些环的形状表现出显著偏差。本研究揭示了剪切下形状变化与平移重排之间的相互作用,从而有助于理解致密堆积、可变形聚合物体系中的屈服转变。

英文摘要:

The yielding response to an imposed oscillatory shear is investigated for a model two-dimensional dense glass composed of bidisperse, deformable polymer rings, with the ring stiffness being the control parameter. In the quiescent glassy state, the more flexible rings exhibit a broader spectrum of shape fluctuations, which becomes increasingly constrained with increasing ring stiffness. Under shear, the highly packed rings yield, i.e. the thermal assembly looses rigidity, with the threshold yield strain increasing significantly with decreasing ring stiffness. Further, the rings display significant deviations in their shape compared to their unsheared counterparts. This study provides insights into the interplay between shape changes and translational rearrangements under shear, thus contributing to the understanding of yielding transition in densely packed, deformable polymer systems.

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