机床支撑地脚结合部法向粗糙接触建模

发布时间：2018-05-03 23:12

本文选题：地脚结合部 + 弹塑性区域　；参考：《浙江大学学报(工学版)》2015年11期

【摘要】：基于对起伏和凹凸不平的表面微观几何学形貌统计分析,考查衡量微接触点的2个弹塑性变形区域,建立机床支撑地脚结合部的实际接触面积、法向接触负载与法向接触刚度的理论解.该理论解综合考虑了材料的弹性、弹塑性与塑性变形规制.计算及分析结果显示:地脚结合部的实际接触面积、法向接触负载和法向接触刚度均随着混凝土地坪与标准平板之间间距的减少而增长,但随着塑性指数的扩大而上升.微接触点高度的概率密度关乎结合部法向接触参数的程度最大.通过有限元仿真对地脚结合部法向接触参数辨识结果进行验证,计及地脚参数的有限元模型得到的谐响应分析和法向接触刚度结果与试验结果一致.结合部法向接触参数的理论考究以及仿真分析为粗糙表面接触特性的扩展探索奠定了基础.
[Abstract]:Based on the statistical analysis of the micro-geometric morphology of the undulating and uneven surfaces, two elastic-plastic deformation regions of the micro-contact points are examined and the actual contact area of the joint of the machine supporting ground foot is established. Theoretical solution of normal contact load and normal contact stiffness. The theoretical solution considers the elastic, elastic-plastic and plastic deformation regulation of materials. The results of calculation and analysis show that the actual contact area, normal contact load and normal contact stiffness increase with the decrease of the distance between concrete floor and standard plate, but increase with the increase of plastic index. The probability density of the height of microcontact points is the most important to the normal contact parameters of the joint. The identification results of the normal contact parameters of the ground foot joint are verified by finite element simulation. The harmonic response analysis and the normal contact stiffness obtained by the finite element model with reference to the ground foot parameters are in agreement with the experimental results. The theoretical study and simulation analysis of the normal contact parameters of the joints lay a foundation for the exploration of the extension of the contact characteristics of rough surfaces.
【作者单位】：三峡大学机械与动力学院;
【基金】：国家自然科学基金资助项目(51275273)
【分类号】：TG502

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