Ghosh Sayantan, Nayak Rahul, Vemparala Satyavani, Chaudhuri Pinaki
The Institute of Mathematical Sciences, C.I.T. Campus, Taramani, Chennai 600113, India.
Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India.
Soft Matter. 2025 Feb 12;21(7):1286-1295. doi: 10.1039/d4sm01069h.
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, the thermal assembly loses 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.
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对施加的振荡剪切的屈服响应，其中环的刚度为控制参数。在静态玻璃态下，较柔性的环表现出更宽的形状波动谱，随着环刚度的增加，这种波动谱受到越来越多的限制。在剪切作用下，高度堆积的环发生屈服，热组装失去刚性，屈服应变阈值随着环刚度的降低而显著增加。此外，与未剪切的环相比，这些环在形状上显示出显著差异。这项研究为剪切作用下形状变化和平动重排之间的相互作用提供了见解，从而有助于理解致密堆积、可变形聚合物系统中的屈服转变。
