Rate-dependent adhesion of cartilage and its relation to relaxation mechanisms
Rate-dependent adhesion of cartilage and its relation to relaxation mechanisms
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DOI：
10.1016/j.jmbbm.2019.103493
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发表时间：
2020-02-01
影响因子：
3.9
通讯作者：
Henak, Corinne R.
中科院分区：
文献类型：
--
作者：
Han, Guebum;Eriten, Melih;Henak, Corinne R.
在边界润滑状态下，软骨粘附在摩擦响应中起着重要作用，但其潜在机制仅被部分理解。本研究探讨了从松弛前到松弛后软骨时间尺度的粘附率依赖性及其与组织松弛反应的可能关系。进行软骨上的粘附测试以获得从松弛到非松弛状态的速率依赖性软骨粘附和相应的松弛响应。根据实验松弛反应分析了软骨粘附的速率依赖性。从松弛状态到非松弛状态，软骨附着力增加约20倍。这种速率相关的增强以及在特征时域中的负载松弛响应。这些实验结果表明，恢复（或放松）的程度在附近的接触过程中卸载支配的速率依赖性的软骨粘附。此外，实验测得的粘附增强解释的帮助下，计算和分析预测的粘弹，多孔粘弹性和凝聚力接触模型的粘附趋势。实验和预测的趋势之间的协议意味着，软骨粘附的增强源于界面剥离和负流体压力的复杂组合在卸载过程中产生的接触区域内。这些发现增强了目前对短时间尺度内探索的速率依赖性粘附机制的理解，从而可以为软骨中的摩擦反应和坚持引起的损伤提供新的见解。
Cartilage adhesion has been found to play an important role in friction responses in the boundary lubrication regime, but its underlying mechanisms have only been partially understood. This study investigates the rate dependence of adhesion from pre-to post-relaxation timescales of cartilage and its possible relation to relaxation responses of the tissue. Adhesion tests on cartilage were performed to obtain rate-dependent cartilage adhesion from relaxed to unrelaxed states and corresponding relaxation responses. The rate dependence of cartilage adhesion was analyzed based on experimental relaxation responses. Cartilage adhesion increased about 20 times from relaxed to unrelaxed states. This rate-dependent enhancement correlated well with the load relaxation responses in a characteristic time domain. These experimental results indicated that the degree of recovery (or relaxation) in the vicinity of contact during unloading governed the rate dependence of cartilage adhesion. In addition, the experimentally measured enhancement of adhesion was interpreted with the aid of computationally and analytically predicted adhesion trends in viscoelastic, poroviscoelastic, and cohesive contact models. Agreement between the experimental and predicted trends implied that the enhancement of cartilage adhesion originated from complex combinations of interfacial peeling and negative fluid pressure generated within the contact area during unloading. These findings enhance the current understanding of rate-dependent adhesion mechanisms explored within short time scales and thus could provide new insight into friction responses and stick-induced damage in cartilage.