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| 1 | Investigation of role of cartilage surface polymer brush border in lubrication of biological joints显示文摘Although experimental evidence has suggested that the polymer brush border(PBB)on the cartilage surface is important in regulating fluid permeability in the contact gap,the current theoretical understanding of joint lubrication is still limited.To address this research gap,a multiscale cartilage contact model that includes PBB,in particular its effect on the fluid permeability of the contact gap,is developed in this study.Microscale modeling is employed to estimate the permeability of the contact gap.This permeability is classified into two categories:For a gap size>1μm,the flow resistance is assumed to be dominated by the cartilage roughness;for gap size<1μm,flow resistance is assumed to be dominated by the surface polymers extending beyond the collagen network of the articular cartilage.For gap sizes of less than 1μm,the gap permeability decreases exponentially with increasing aggrecan concentration,whereas the aggrecan concentration varies inversely with the gap size.Subsequently,the gap permeability is employed in a macroscale cartilage contact model,in which both the contact gap space and articular cartilage are modeled as two interacting poroelastic systems.The fluid exchange between these two media is achieved by imposing pressure and normal flux continuity boundary conditions.The model results suggest that PBB can substantially enhance cartilage lubrication by increasing the gap fluid load support(e.g.,by 26 times after a 20-min indentation compared with the test model without a PBB).Additionally,the fluid flow resistance of PBB sustains the cartilage interstitial fluid pressure for a relatively long period,and hence reduces the vertical deformation of the tissue.Furthermore,it can be inferred that a reduction in the PBB thickness impairs cartilage lubrication ability. | JinJing LIAO David W.SMITH Saeed MIRAMINI Bruce S.GARDINER Lihai ZHANG | 2022 | Friction2022，10，1： | 2 |
| 2 | Microscopic dynamic observation of adhesion hysteresis friction and exploration of the influence of different pressures on friction transmission显示文摘The mechanism of adhesive friction between viscoelastic materials is a key question.In this study,the friction process of the adhesive interface between a friction lining and a wire rope is dynamically observed in real time to analyze the adhesion hysteresis friction intuitively and quantitatively.The adhesion is determined by the state of motion,while the relative displacement of the wire rope and lining is used to find the magnitude of the adhesive friction.The hysteresis friction is reflected by the internal deformation of the lining.The magnitude of the hysteresis friction is determined by the displacement difference(Ax)in the sliding direction of two marked points at different distances from the contact surface.The results show that the adhesion friction is proportional to the loss modulus and the hysteresis friction is proportional to the ratio of the loss modulus to the square of the storage modulus(E'/(E'^(2))).The frictional vibration first decreases and then increases with the increase in pressure.The K25 lining has the highest adhesion hysteresis friction and minimal frictional vibration.The result provides a simple and intuitive method for research into the friction transmission and vibration of viscoelastic materials. | Cun-ao FENG De-kun ZHANG Kai CHEN | 2021 | Friction2021，9，4： | 1 |
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