BEHAVIOR OF LUBRICATION LAYERS OF PLATENS IN ELEMENT TESTS
BEHAVIOR OF LUBRICATION LAYERS OF PLATENS IN ELEMENT TESTS
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压盘润滑层在元件测试中的表现
DOI：
10.3208/sandf1972.24.113
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发表时间：
1984
影响因子：
3.7
通讯作者：
Tsutomu Hino
中科院分区：
文献类型：
--
作者：
F. Tatsuoka;F. Molenkamp;Tsuyoshi Torii;Tsutomu Hino
为了更好地了解砂样和压板之间的润滑方法，对润滑层进行了一系列直接剪切试验和其他相关试验。所用的润滑层由润滑脂和乳胶圆盘组成。为了获得良好的润滑质量，首先需要润滑脂在压缩时具有足够的抗挤出性。在润滑脂中包含细固体填料会增加这种阻力，而结果是，随着填料量的增加，未挤出时的润滑效果也会降低。润滑质量至少取决于以下因素：（1）润滑脂的质量（基础硅油的粘度和润滑脂中包含的细固体填料的量），（2）法向应力，（3）有关乳胶盘和硅脂的组成。对于低法向应力下的润滑，可推荐以下组成：（1）润滑脂应由低粘度硅油和适量填料组成，（2）润滑脂层表面应光滑。对于高法向应力下的润滑，可推荐以下成分：（1）润滑脂应由高粘度硅油和适量细填料组成，以及（2）可降低润滑脂层中应力集中的成分。通过使用适当的润滑方法，对于至少150 ~ 670 kN/m2的法向应力，放置在细角砂体和钢压板之间的润滑层的表观摩擦角可以远小于1度。
The results of a series of direct shear tests on lubrication layers and other related tests performed to get a better insight into the methods of lubrication between the sand samples and the platens are described. The lubrication layers used consist of grease and latex disc. To get a good quality of lubrication, it is first needed that the grease has an enough resistance against squeezing out when compressed. The inclusion of fine solid fillers in the grease increases this resistance, while as a result lubrication when not squeezed out becomes less effective with the increase in the amount of fillers as well. The quality of lubrication depends on the following factors at least; (1) the quality of grease (the viscosity of the base silicone oil and the amount of fine solid fillers included in the grease), (2) the normal stress, (3) the composition concerning latex disc and silicone grease. For the lubrication at low normal stresses, the following composition may be recommended; (1) the grease should be composed of low viscosity silicone oil and an appropriate amount of fillers, and (2) a smooth surface should be facing the grease layer. For the lubrication at high normal stresses the following composition may be recommended; (1) the grease should be composed of high viscosity silicone oil and an appropriate amount of fine fillers, and (2) a composition with which stress concentrations in the grease layer are reduced. By using an appropriate method of lubrication the apparent angle of friction for a lubrication layer placed between a fine angular sand mass and a steel platen can be much smaller than 1 degree for normal stresses of 150∼670 kN/m2 at least.