结合面卸载分形模型  

Fractal Unloading Model of Joint Interfaces

作　　者：缪小梅[1] 黄筱调[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009

出　　处：《农业机械学报》2014年第6期329-332,323,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51175242);国家科技重大专项资助项目(2010ZX04011-032)

摘　　要：基于分形接触理论以及微凸体的卸载模型,建立了结合面的分形卸载模型。在模型中考虑了弹性以及弹塑性微凸体的卸载。通过对所建模型的数值仿真,揭示了卸载过程中接触载荷、实际接触面积、接触压力与干涉量间的非线性关系,以及卸载过程与加载过程的不同。结果表明,结合面的卸载过程是弹性的,且卸载过程取决于加载过程的最终状态。卸载过程中,接触面积和载荷是干涉量的函数。卸载开始时,接触面积和接触载荷都急剧减小,并且小于加载时的值。随着卸载量的增加,接触面积很快超过了加载时的接触面积,而接触载荷在很大范围内都远小于加载时的接触载荷。在整个干涉量区间内,接触压力都远小于卸载时的接触压力。A fractal unloading model of joint interfaces was established based on fractal contact theory and unloading model of asperity. The unloading of asperities both elastic and elastic-plastic deformation was taken into account in the model. By numerical simulation, the nonlinear relationship among the real contact areas, contact force, contact pressure and interference was obtained, as was as the difference between loading and unloading. The result showed that the unloading process of joint interfaces was elastic, and depended on the final condition of loading. During the unloading process, the real contact area and contact force depended on the interference of joint interface. When the loading process started, both the real contact area and contact force sharply decreased and smaller than the values during loading. As the interference increased, the real contact area became larger than the value during loading soon, while the contact force was smaller than the value during loading in a wide range of interference. The unloading contact pressure was much less than the loading contact pressure within the entire interference interval.

关 键 词：结合面 分形模型 卸载模型 

分 类 号：TH113.1[机械工程—机械设计及理论]