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有关微观物体的粘附力与变形分析在微机械和表面物理中越来越重要.文章以表面形状由幂函数描述的轴对称微冲头与半空间体为研究对象,分析作用于微冲头上的分子间作用力和液桥张力,分析了在微观力作用下的微冲头接触前的弹性变形.最后以液桥张力作用力下微冲头的特例———微球为对象,分析了液桥体积对微冲头顶端竖向变形的影响.分析结果表明,小间距时,作用于微冲头顶端的液桥力随间距的增大而减小,并随液桥体积的增大而增大.在较大间距时,液桥力与液桥体积之间的关系却出现了一种波动现象,而在小间距时,微冲头的变形随液桥体积的增加而减小,同时随液桥体积变化而先增后减的波动,大间距时这种波动现象愈加明显.微冲头的粘附接触特性中出现的这种波动现象也说明了微观尺寸效应的存在.
The adhesion and deformation analysis of micro-objects are more and more important in micro-mechanics and surface physics.In this paper, the axial-symmetric micro-punch and half-space body whose surface shape is described by power function is taken as the research object, and the analysis is applied to the micro-punch Of the intermolecular force and liquid bridge tension, the micro-force under the action of the micro-punch before the contact elastic deformation.Finally, the liquid bridge tension force micro-punching special --- microsphere as the object, the analysis of the The influence of the liquid bridge volume on the vertical deformation of micro punch tip is analyzed.The results show that the liquid bridge force acting on the micro punch tip decreases with the increase of space distance at small pitch, Increase.When the spacing is larger, the relationship between the liquid bridge force and the liquid bridge volume appears a kind of wave phenomenon, while at small distance, the deformation of the micro-punch decreases with the increase of liquid bridge volume, meanwhile, Fluctuations that increase first and then decrease with the volume of the liquid bridge become more obvious when the distance is larger. The phenomenon of fluctuation in the adhesion characteristics of the micro-punch also shows the existence of the microscopic size effect.