Normal Contact Stiffness Model on Joint Surface of Conical Asperity Considering Friction
Based on fractal theory and the assumption of equivalent rough surfaces,considering the changes in critical contact load under frictional conditions,a more accurate fractal model of the normal contact stiff-ness of the joint surface about conical asperity was established and the contact load and the contact carrying capacity under different frictional levels and fractal characteristics were acquired.The outcomes of analysis reveal that the stiffness of normal contact on interface add with the raise of dimension of fractal,diminish-ing with the raise of roughness of fractal.If the friction coefficient value increase,it will reduce,involving single dimension and index patterns with the variety of fractal dimension are demonstrated at the same time.The connection,between the contact stiffness of normal direction and the plastic index of materials,presents different results due to the different values of fractal dimension the normal contact adaptability to bend is proportional to the normal contact weight to be conveyed.Comparing and analyzing theoretical cal-culations with experimental results,the precision of the established model was verified,benefiting for subse-quent analysis and calculation of theoretics for entire machine structure.
NETL
NSTL
万方数据
