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arXiv 0909.2447cond-mat.stat-mechcond-mat.mes-hall
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有限探针尺寸对自仿射粗糙度测量的影响

Effects of finite probe size on self-affine roughness measurements

F. Lechenault, G. Pallares, M. George, C. Rountree, E. Bouchaud, M. Ciccotti

摘要:

断裂表面的粗糙度已被证明表现出自仿射尺度不变性的各种材料和负载条件。这一制度所延伸的尺度范围以及相关指数的普遍性仍然是一个有争议的问题。然而,这些表面的形貌通常用比微结构大的接触探针来研究。在这种情况下,我们表明,粗糙度和相应的赫斯特指数$ζ$的关联函数只能测量到长度尺度$Δxc$,这取决于探针大小$R$,在$ζ$和表面拓扑$l$,并表现出虚假的行为在较小的尺度。首先,我们从一个简单的缩放参数推导出$Δxc$对这些参数的依赖性。然后,我们研究了这种依赖性的数值和验证我们的理论预测。最后,我们建立了相关的AFM测量实验玻璃断裂表面的分析,并提供了一个粗糙度测量的测量程序。

英文摘要:

The roughness of fracture surfaces has been shown to exhibit self-affne scale invariance for a wide variety of materials and loading conditions. The range of scales over which this regime extends remains a matter of debate, together with the universality of the associated exponents. The topography of these surfaces is however often investigated with a contact probe that is larger than the micro-structure. In this case, we show that the correlation function of the roughness and the corresponding Hurst exponent $ζ$ can only be measured down to a length scale $Δxc$ which depends on the probe size $R$, on $ζ$ and on the surface topothesy $l$, and exhibit spurious behavior at smaller scales. First, we derive the dependence of $Δxc$ on these parameters from a simple scaling argument. Then we study this dependence numerically and verify our theoretical prediction. Finally, we establish the relevance of this analysis from AFM measurements on an experimental glass fracture surface and provide a metrological procedure for roughness measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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