The fibre-reinforced structure in synovial articular cartilage plays an important role in enhancing the fluid load support in the biphasic lubrication mechanism.Poly(vinyl alcohol)(PVA)hydrogel is a potential biomimet...The fibre-reinforced structure in synovial articular cartilage plays an important role in enhancing the fluid load support in the biphasic lubrication mechanism.Poly(vinyl alcohol)(PVA)hydrogel is a potential biomimetic articular cartilage material.In this study,PVA hydrogel was reinforced with PVA fibres to improve its frictional properties.By computational analysis,the position of the PVA fibre layer was examined with a migrating contact condition to reduce the friction coefficient.To improve the fibre reinforcement,a method for fibre placement was developed to retain the initial strain of the fibre in the hydrogel matrix.The experimental results showed that the fibre-reinforced PVA hydrogel with a surface fibre layer had a low friction coefficient of 0.031 in pure water.The fibre-reinforced PVA hydrogel successfully reduced friction coefficient.展开更多
The soft hydrogel material is expected for a candidate material as biomimetic artificial cartilage with synergisticfunctionalities of adaptive multimode lubrication.In boundary lubrication mode of hydrogel material,th...The soft hydrogel material is expected for a candidate material as biomimetic artificial cartilage with synergisticfunctionalities of adaptive multimode lubrication.In boundary lubrication mode of hydrogel material,the biphasiclubrication mechanism cooperatively exerts its functionality.In hydrodynamic lubrication mode,it is preferable that thelubricating surfaces be impermeable to trap the fluid pressure in contact surfaces,whereas the actual biphasic materiallike a hydrogel is a permeable material with surface porosity.lt is indicated that the interstitial fluid pressurisation inthe permeable biphasic material can contribute to significant fluid load support under lower sliding speed condition.So,the authors examined how the contrary fluid pressure effect appears in the transition from the boundarylubrication mode to soft elastohydrodynamic lubrication mode.In the experiment,a small pressure sensor was utilisedto measure the in-situ fluid pressure in sliding condition.Although the experimental condition of this study wasselective,the result showed a possibility of the negative effect of the biphasic surface,in which the permeable surfacediminished the hydrodynamic fluid pressure.This means that one should manage and enhance the biphasic lubricationabilities in wide operation range when the hydrogel material was used as a load bearing material.展开更多
基金the Grant-in-Aid for Specially Promoted Research of Japan Society for the Promotion of Science(JSPS)(KAKENHI:23000011)the Grant-in-Aid for Science Research of JSPS(KAKENHI:16H03170).
文摘The fibre-reinforced structure in synovial articular cartilage plays an important role in enhancing the fluid load support in the biphasic lubrication mechanism.Poly(vinyl alcohol)(PVA)hydrogel is a potential biomimetic articular cartilage material.In this study,PVA hydrogel was reinforced with PVA fibres to improve its frictional properties.By computational analysis,the position of the PVA fibre layer was examined with a migrating contact condition to reduce the friction coefficient.To improve the fibre reinforcement,a method for fibre placement was developed to retain the initial strain of the fibre in the hydrogel matrix.The experimental results showed that the fibre-reinforced PVA hydrogel with a surface fibre layer had a low friction coefficient of 0.031 in pure water.The fibre-reinforced PVA hydrogel successfully reduced friction coefficient.
基金the Grant-in-Aid forSpecially Promoted Research of Japan Society for the Promotionof Science(JSPS)(KAKENHI:23000011)the Grant-in-Aidfor Science Research of JSPS(KAKENHI:16H03170).
文摘The soft hydrogel material is expected for a candidate material as biomimetic artificial cartilage with synergisticfunctionalities of adaptive multimode lubrication.In boundary lubrication mode of hydrogel material,the biphasiclubrication mechanism cooperatively exerts its functionality.In hydrodynamic lubrication mode,it is preferable that thelubricating surfaces be impermeable to trap the fluid pressure in contact surfaces,whereas the actual biphasic materiallike a hydrogel is a permeable material with surface porosity.lt is indicated that the interstitial fluid pressurisation inthe permeable biphasic material can contribute to significant fluid load support under lower sliding speed condition.So,the authors examined how the contrary fluid pressure effect appears in the transition from the boundarylubrication mode to soft elastohydrodynamic lubrication mode.In the experiment,a small pressure sensor was utilisedto measure the in-situ fluid pressure in sliding condition.Although the experimental condition of this study wasselective,the result showed a possibility of the negative effect of the biphasic surface,in which the permeable surfacediminished the hydrodynamic fluid pressure.This means that one should manage and enhance the biphasic lubricationabilities in wide operation range when the hydrogel material was used as a load bearing material.
