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首页> 外文OA文献 >Dynamics of the contact between a ruthenium surface with a single nanoasperity and a flat ruthenium surface: Molecular dynamics simulations
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Dynamics of the contact between a ruthenium surface with a single nanoasperity and a flat ruthenium surface: Molecular dynamics simulations

机译：钌表面与单一表面接触的动力学  纳米粗糙和平坦的钌表面：分子动力学模拟

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We study the dynamics of the contact between a pair of surfaces (withproperties designed to mimic ruthenium) via molecular dynamics simulations. Inparticular, we study the contact between a ruthenium surface with a singlenanoasperity and a flat ruthenium surface. The results of such simulationssuggest that contact behavior is highly variable. The goal of this study is toinvestigate the source and degree of this variability. We find that duringcompression, the behavior of the contact force displacement curves isreproducible, while during contact separation, the behavior is highly variable.Examination of the contact surfaces suggest that two separation mechanism arein operation and give rise to this variability. One mechanism corresponds tothe formation of a bridge between the two surfaces that plastically stretchesas the surfaces are drawn apart and eventually separates in shear. This leadsto a morphology after separation in which there are opposing asperities on thetwo surfaces. This plastic separation/bridge formation mechanism leads to alarge work of separation. The other mechanism is a more brittle-like mode inwhich a crack propagates across the base of the asperity (slightly below theasperity/substrate junction) leading to most of the asperity on one surface orthe other after separation and a slight depression facing this asperity on theopposing surface. This failure mode corresponds to a smaller work ofseparation. those in which a single mechanism operates. Furthermore, contactsmade from materials that exhibit predominantly brittle-like behavior will tendto require lower work of separation than those made from ductile-like contactmaterials.
机译：我们通过分子动力学模拟研究了一对表面之间的接触动力学（具有模拟钌的特性）。特别是，我们研究了具有单纳米粗糙性的钌表面和平坦的钌表面之间的接触。这种模拟的结果表明接触行为是高度可变的。这项研究的目的是调查这种变异的来源和程度。我们发现，在压缩过程中，接触力位移曲线的行为是可重现的，而在接触分离过程中，行为是高度可变的。接触表面的检查表明，两种分离机理都在起作用，并引起这种变化。一种机制对应于两个表面之间的桥的形成，该桥在两个表面被拉开并最终在剪切时分离时会塑性拉伸。这导致分离后的形态，其中两个表面上存在相对的凹凸。这种塑料分离/桥形成机理导致了较大的分离工作。另一种机理是更脆的模式，其中裂纹在粗糙的基部（略低于粗糙/基体接合处）处传播，导致分离后一个表面或另一个表面上的大部分粗糙，以及在相对的表面上面对该粗糙的轻微凹陷表面。此故障模式对应于较小的分离工作。单一机制运作的组织。此外，由表现出主要为脆性的行为的材料制成的接触件将比由延展性的接触材料制成的接触件需要更低的分离功。

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