论文标题
温度在弹性网络的刚性裂缝中的作用
The role of temperature in the rigidity-controlled fracture of elastic networks
论文作者
论文摘要
我们通过模拟具有变化的刚度（即连接性）的单轴延伸，研究了热波动对弹性网络断裂的影响。在研究其失败反应，无论是在宏观和微观水平上，我们发现温度的升高都对应于更均匀的应激（RE）分布，并诱导弹簧的热激活失败。结果，材料强度在升高时降低，损伤分布在较大的长度尺度上，并且观察到更延性的断裂过程。这些效果是通过网络刚度调节的，因此可以通过网络连接性和弹簧的破裂阈值来调节。了解温度与刚性之间的相互作用的知识可以提高我们对弹性网络断裂（例如（生物）聚合物网络）的理解，并可以帮助完善较硬的软材料的设计原理。
We study the influence of thermal fluctuations on the fracture of elastic networks, via simulations of the uniaxial extension of central-force spring networks with varying rigidity, i.e. connectivity. Studying their failure response, both at the macroscopic and microscopic level, we find that an increase in temperature corresponds to a more homogeneous stress (re)distribution and induces thermally activated failure of springs. As a consequence, the material strength decreases upon increasing temperature, the damage is spread over larger lengthscales and a more ductile fracture process is observed. These effects are modulated by network rigidity and can therefore be tuned via the network connectivity and the rupture threshold of the springs. Knowledge of the interplay between temperature and rigidity improves our understanding of the fracture of elastic networks, such as (biological) polymer networks, and can help to refine design principles for tough soft materials.
