积极强调边际网络
Actively stressed marginal networks
摘要:
我们使用平均场、有效介质理论、标度分析和计算模型相结合的方法研究了电机产生的应力在无序三维纤维网络中的作用。我们发现,电机活动控制的弹性在一个异常的方式接近临界网络波动耦合到临界稳定点。我们还表明,电动机应力可以稳定最初的软盘网络,扩展范围的临界行为,以广泛的制度的网络连通性低于边缘点。远离该状态,或在高应力下,马达引起刚度随应力线性增加。最后,我们证明了我们的结果被捕获的一个简单的,本构标度关系突出的重要作用,非仿射应变波动的敏感性电机应力。
英文摘要:
We study the effects of motor-generated stresses in disordered three dimensional fiber networks using a combination of a mean-field, effective medium theory, scaling analysis and a computational model. We find that motor activity controls the elasticity in an anomalous fashion close to the point of marginal stability by coupling to critical network fluctuations. We also show that motor stresses can stabilize initially floppy networks, extending the range of critical behavior to a broad regime of network connectivities below the marginal point. Away from this regime, or at high stress, motors give rise to a linear increase in stiffness with stress. Finally, we demonstrate that our results are captured by a simple, constitutive scaling relation highlighting the important role of non-affine strain fluctuations as a susceptibility to motor stress.
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