How does roughness kill adhesion?

How does roughness kill adhesion?
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粗糙度如何消除粘附力?

DOI:
10.1016/j.jmps.2023.105465
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发表时间:
2023
影响因子:
5.3
通讯作者:
Afferrante L
Afferrante L
中科院分区:
工程技术2区
文献类型:
--
作者:
Afferrante L

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众所周知,附着力受到表面粗糙度的强烈影响。然而,文献目前包含一个正在进行的争论,关于粗糙度尺度是主要负责的附着力损失。在这项研究中,我们的目标是通过对不同分形维数的自仿射分形剖面进行数值模拟来为这一争论做出贡献。我们的研究结果表明,当考虑具有赫斯特指数H b>的轮廓时,粗糙度光谱的长波长部分在杀死粘附方面起着至关重要的作用。5. 相反,对于H< 0的概要。5、结果显示出不同的趋势,说明胶粘剂的粘性也受到短波长的粗糙度的影响。我们最近的实验观察证实了这些发现。在这种情况下,随着粗糙度尺度的增大,粘接滞回率和拉脱力呈现连续减小的趋势。然而,对于H b> 0。5、随着放大倍数的增大,拉脱力向有限值收敛。
It is well-known that adhesion is strongly influenced by surface roughness. Nevertheless, the literature currently contains an ongoing debate regarding which roughness scales are primarily responsible for adhesion loss. In this study, we aim to contribute to this debate by conducting numerical simulations on self-affine fractal profiles with varying fractal dimensions. Our results reveal that the long-wavelength portion of the roughness spectrum plays a crucial role in killing adhesion when considering profiles with Hurst exponent H> 0. 5. Conversely, for profiles with H< 0. 5, results show a different trend, indicating that adhesive stickiness is also influenced by short wavelength roughness. These findings are corroborated by our recent experimental observations. In such case, adhesive hysteresis and pull-off force exhibit a continuous decrease with increasing roughness scales. However, for H> 0. 5, the pull-off force converges towards a finite value as the magnification increases.
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