Load-separation curves for the contact of self-affine rough surfaces.

Load-separation curves for the contact of self-affine rough surfaces.
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DOI:
10.1038/s41598-017-07234-4
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发表时间:
2017-07-31
期刊:
影响因子:
4.6
通讯作者:
Ciavarella M
Ciavarella M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Papangelo A;Hoffmann N;Ciavarella M

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粗糙固体接触的近似理论主要有两种:Greenwood-Williamson粗糙理论(GW)和Persson粗糙理论。到目前为止,这两种方法在载荷-分离曲线方面都没有得到充分的评估。通过广泛的数值研究,我们将重点放在低分形维数(Df = 2.2)的最重要的情况下,我们发现:(i) Persson的理论很好地描述了中间压力/接触面积的情况,但需要重要的校正因素:后者也取决于粗糙度的上波矢量截止;因此,(ii) Persson的理论不能正确预测功能对放大的依赖;(iii)离散版本中的粗糙理论即使忽略了相互作用效应,也更适合于较大的分离范围,并且考虑到实际实现表面时的较大散射。
There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (Df = 2.2) with extensive numerical studies we find that: (i) Persson’s theory describes well the regime of intermediate pressures/contact area, but requires significant corrective factors: the latter depend also on upper wavevector cutoff of the roughness; hence, (ii) Persson’s theory does not predict the correct functional dependence on magnification; (iii) asperity theories in the discrete version even neglecting interaction effects are more appropriate in the range of relatively large separations, also to take into consideration of the large scatter in actual realization of the surface.
DOI: 10.1098/rspa.2002.1038
发表时间: 2003-01-08
影响因子: 3.5
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