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首页> 外文期刊>Journal of Biomechanics >Determinants of friction in soft elastohydrodynamic lubrication.
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Determinants of friction in soft elastohydrodynamic lubrication.

机译：软弹性流体动力润滑中摩擦的决定因素。

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Elastohydrodynamic lubrication (EHL) protects soft tissues from damage and wear in many biological systems (e.g. synovial joints, cornea of the eye, and pleural surfaces of the lung and chest wall). Among studies of lubrication of deformable solids, few have examined the effects of external loads, geometry, and material properties on EHL of soft tissues. To examine these effects, we studied the tribology of soft tissues in a two-dimensional finite element simulation of a thin layer of fluid separating a sliding rigid surface from a soft asperity or bump with an initial sinusoidal shape. We computed the frictional force, deformation of the solid, and change in fluid thickness as functions of independent variables: sliding velocity, normal load, material properties, and bump amplitude and length. Double-logarithmic regression was used to determine the exponents of the scaling relationships of friction coefficient and minimum fluid thickness to the independent variables. The analysis showed that frictional shear force is strongly dependent on velocity, viscosity, and load, moderately dependent on bump length and elasticity, and only weakly dependent on the bump amplitude. The minimum fluid thickness is strongly dependent on velocity and viscosity, and changes moderately with load, elasticity, amplitude, and length. The shape of the bump has little effect. The results confirm that the shear-induced deformation of an initially symmetrical shape, including generalizations to other symmetrical geometries such as quadratic or piecewise linear bumps, leads to load-supporting behavior.
机译：弹性流体动力润滑（EHL）可保护软组织免受许多生物系统（例如滑膜关节，眼角膜以及肺和胸壁胸膜表面）的损坏和磨损。在润滑可变形固体的研究中，很少有人研究外部载荷，几何形状和材料特性对软组织EHL的影响。为了检查这些影响，我们在二维薄层流体有限元模拟中研究了软组织的摩擦学，该流体薄层将滑动的刚性表面与具有初始正弦曲线形状的软凹凸或凸块分离开来。我们计算了摩擦力，固体变形和流体厚度的变化，这些变量是独立变量的函数：滑动速度，法向载荷，材料特性以及碰撞幅度和长度。使用双对数回归来确定摩擦系数和最小流体厚度与自变量之间的比例关系的指数。分析表明，摩擦剪切力在很大程度上取决于速度，粘度和载荷，在一定程度上取决于凸块的长度和弹性，而在很小程度上取决于凸块的振幅。最小流体厚度在很大程度上取决于速度和粘度，并随载荷，弹性，振幅和长度而适度变化。凸起的形状影响很小。结果证实，由剪切引起的初始对称形状的变形，包括对其他对称几何形状（如二次或分段线性凸点）的推广，都导致了载荷支撑行为。

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