水表面张力对切向土壤黏附力的影响(摘选)

Effect of Water Surface Tension on Tangential Soil Adhesion(Extracts)

土壤黏附力特别是土壤与轮胎或履带间的切向黏附对提高非公路用车的性能具有显著的作用。从另一方面来说,土壤黏附作用在轮胎或履带上会降低车辆的通过性。为了能有效解决这一问题,有必要对土壤黏附的机理进行探讨。该研究意在探讨水表面张力对土壤粒子与接触面间切向土壤黏附力的影响。不同直径的玻璃微珠用来模拟土壤颗粒,对3种不同材料进行试验。试验测定了玻璃微珠外不同直径水膜下,玻璃微珠与金属板之间的切向力。结果表明,在任何玻璃微珠直径下,任何试材的切向黏附力都与水膜直径成正比。对于任何材料,比例系数k(反映切向黏附力与水膜直径的关系)都随着玻璃微珠直径呈线性增加。如果使用亲水材料,则k接近线性系数。因此,切向黏附力与玻璃微珠外水膜密切相关。

Soil adhesion,especially the tangential adhesion between soil and tire or track,has a significant role on improving the performance of off-road vehicle.On the other hand,soil sticking to tire or track reduces the performance of tire or track of off-road vehicles.In order to solve this problem effectively,the mechanism of soil adhesion should be understood.The purpose of this study was to find out the effect of water surface tension on the tangential soil adhesion force generated between soil particle and the contact surface of material.Glass beads in different diameter were used as models to simulate soil particles and three kinds of materials were provided.The tangential force generated between the glass bead and the plate was measured at various diameters of water film rings formed around the glass beads.Experimental results showed that no matter what kinds of material plates were used tangential adhesion was directly proportional to the diameters of the water film rings even if the diameter of glass beads were different.No matter what kinds of material plates were used,proportional coefficient k which reflects the relationship between tangential adhesion force and water film diameter in the tangential adhesion formula increased linearly with the increase of glass bead diameter.And coefficients of approximate lines were exactly the same if materials with the same hydrophilic were used.Therefore tangential adhesion was closely related to water film rings formed around glass beads.