In this work, the mechanical response oF an one-dimensional active solid -- defined as a network of active stochastic particles interacting by nonlinear hard springs -- subject to an external deformation force, is numerically studied and rationalized with a minimal model. It is found that an active solid made of linear springs and subject to an external stress, presents an average deformation which is independent of the system's activity. However, when the active solid is made of nonlinear hard springs, the solid's average deformation decreases with respect to a passive system under the same conditions, and as a function of activity and rotational noise in the system. The latter result may shed light on new ways to creating an active metamaterial, which could tune its stiffness by moving either its activity or rotational noise.
Mechanical inhibition of dissipation in a thermodynamically consistent active solid
Max Planck Institute for Dynamics and Self-Organization（马克斯·普朗克动力学与自组织研究所）；Rudolf Peierls Centre for Theoretical Physics, University of Oxford（牛津大学鲁道夫·派尔斯理论物理中心）
Statistical mechanics of permanent random atomic and molecular networks: Structure and heterogeneity of the amorphous solid state
在足够的永久无规共价键合下，原子或小分子的流体转变成非晶态固体网络。由于是无定形的，这种网络的局部结构特性在样品中各不相同。一个自然的序参量，从一个物理力学的方法，通过一定的联合概率分布捕获有关这种异质性的信息。这种联合概率分布描述了粒子的位置和取向局部化的变化，反映了它们所经历的随机环境，以及表征粒子热运动的进一步信息。一个完整的解决方案，在附近的非晶凝固转变有效，基本上是解析构造的非晶态固体序参量，在随机网络模型和方法的背景下引入的Goldbart和Zippelius [Europhys. Lett. 27，599（1994）]。这个序参量的知识使我们能够得出某些结论的结构和非均匀性的随机共价键合的原子或分子网络固体在附近的非晶凝固转变。除其他外，颗粒本地化的位置方面的建立，以精确地获得的结构perperperly在硫化介质的上下文中，和结果被发现的自旋玻璃序参量描述的粒子之间的键的取向冻结的模拟。
Unravelling the multiscale surface mechanics of soft solids
Universite Lyon 1（里昂第一大学）；CNRS（法国国家科学研究中心）；Institut Lumière Matière（光与物质研究所）；ETH Zürich（苏黎世联邦理工学院）；Yale University（耶鲁大学）；Institute of Science and Technology Austria (ISTA)（奥地利科学技术研究院）；Cornell University（康奈尔大学）
Activated solids: Spontaneous deformations, non-affine fluctuations, softening, and failure
Institute of Physics, Sachivalaya Marg, Bhubaneswar-751005, Odisha, India（印度物理研究所）；Georg-August-Universität Göttingen, Wilhelmsplatz 1, 37073 Göttingen, Germany（哥廷根大学）；Tata Institute for Fundamental Research Hyderabad, 36/P Gopanapally, Hyderabad 500107, India.（塔塔基础研究院海得拉巴分校）；Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India（霍米·巴巴国立研究所）
