论文标题
无定形固体屈服行为的模型
Models for the yielding behaviour of amorphous solids
论文作者
论文摘要
了解固体的机械响应和失效在用作结构材料方面至关重要。近年来，塑性变形导致无定形固体产生的性质。采用单向和循环变形方案的研究表明，屈服行为对退火程度有很强的依赖性。退火的阈值程度低于定性变化的性质，逐渐不连续的屈服。无定形固体屈服的理论研究几乎完全集中在单向变形下的屈服上，但是循环变形揭示了几个有趣的特征，这些特征在很大程度上尚未进行。重点关注静态环形变形，我根据能量景观描述研究了一个模型家族。这些模型重现了在模拟中观察到的关键有趣特征，并为阈值能量的有趣存在提供了解释。
Understanding the mechanical response and failure of solids is of obvious importance in their use as structural materials. The nature of plastic deformation leading to yielding of amorphous solids has been vigorously pursued in recent years. Investigations employing both unidirectional and cyclic deformation protocols reveal a strong dependence of yielding behaviour on the degree of annealing. Below a threshold degree of annealing, the nature of yielding changes qualitatively, to progressively more discontinuous yielding. Theoretical investigations of yielding in amorphous solids have almost exclusively focused on yielding under unidirectional deformation, but cyclic deformation reveals several interesting features that remain largely un-investigated. Focusing on athermal cyclic deformation, I investigate a family of models based on an energy landscape description. These models reproduce key interesting features observed in simulations, and provide an interpretation for the intriguing presence of a threshold energy.
