基于拟土颗粒DEM数值模型的静态液桥力测试方法

发布时间：2019-04-28 18:38

【摘要】：为经济便捷地测定微量液桥力与球颗粒间距的关系,提出基于微量天平的手动与连续测试的方法,能实现两球位置精确移动和间隙调整,观察并记录液桥从拉伸直至断裂的形态和液桥力变化,采用连续测量方式还可自动实现液桥力数值的连续输出。对等径球和异径球液桥力的测试记录与不同公式计算结果的比较表明,手动和连续测试方法具有较高测试精度且经济适用,可用于对不同液桥力公式的精度进行评估;对异径球液桥力的测试与不同公式结果的比较还表明,静态液桥力近似公式简洁明确精度较好,可供选用。
[Abstract]:In order to determine the relationship between micro-liquid bridge force and particle spacing conveniently and economically, a manual and continuous measurement method based on micro-balance is put forward, which can realize the precise movement of two ball positions and the adjustment of clearance. The shape and force change of the liquid bridge from drawing to fracture are observed and recorded. The continuous output of the hydraulic bridge force value can also be realized automatically by means of continuous measurement. The results show that the manual and continuous testing methods have high testing accuracy and are economical and applicable, and can be used to evaluate the accuracy of different hydraulic bridge force formulas. The results show that the hydraulic bridge forces of equal diameter ball and non-diameter sphere are compared with the calculated results of different formulas, and the results show that the manual and continuous testing methods are of high accuracy and economic applicability. The comparison between the test and the results of different formulas shows that the approximate formula of static hydraulic bridge force is simple and precise, and can be used for selection.
【作者单位】：中国农业大学理学院;
【基金】：国家自然科学基金资助项目(11272341;11072260)
【分类号】：S152

【相似文献】