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arXiv 0707.4014cond-mat.softcond-mat.mtrl-sci
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非晶材料的可逆塑性

Reversible plasticity in amorphous materials

M. Lundberg, K. Krishan, N. Xu, C. S. O'Hern, M. Dennin

摘要:

我们理解材料流变学的一个基本假设是,当微观变形是可逆的时,材料对外部载荷产生弹性响应。塑性,即材料中的耗散和不可逆的宏观变化,被认为是不可逆的微观事件的结果。在这里,我们显示在微观尺度上的可逆塑性事件的直接证据,在实验和模拟的二维泡沫。在模拟中,我们证明了可逆的塑料重排事件和系统的势能景观的途径之间的联系。这些发现代表了我们对材料理解的根本性变化-微观可逆性并不一定意味着弹性。

英文摘要:

A fundamental assumption in our understanding of material rheology is that when microscopic deformations are reversible, the material responds elastically to external loads. Plasticity, i.e. dissipative and irreversible macroscopic changes in a material, is assumed to be the consequence of irreversible microscopic events. Here we show direct evidence for reversible plastic events at the microscopic scale in both experiments and simulations of two-dimensional foam. In the simulations, we demonstrate a link between reversible plastic rearrangement events and pathways in the potential energy landscape of the system. These findings represent a fundamental change in our understanding of materials--microscopic reversibility does not necessarily imply elasticity.

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