考虑摩擦和微凸体相互作用的结合面接触刚度和阻尼模型  

MODEL OF NORMAL CONTACT STIFFNESS AND DAMPING OF JOINT SURFACES CONSIDERING FRICTION AND ASPERITY INTERACTION

作　　者：赵海路 张学良[1] 许雍泰 ZHAO HaiLu;ZHANG XueLiang;XU YongTai(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学机械工程学院,太原030024

出　　处：《机械强度》2023年第2期430-437,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51275328);山西省自然科学基金项目(201901D111248);太原科技大学校级研究生教育创新项目(XCX212074)资助。

摘　　要：基于三维分形理论,建立了同时考虑摩擦和微凸体相互作用影响的结合面法向接触刚度和接触阻尼分形模型。通过对所建模型仿真,分析了摩擦因数、分形维数、分形粗糙度参数和接触载荷对接触刚度和接触阻尼的影响。研究结果表明,该模型的接触刚度和接触阻尼随着法向载荷和分形维数的增大而增大,且会随着分形粗糙度参数的增大而变小;接触刚度随着摩擦因数的增大而减小,而接触阻尼则随着摩擦因数的增大而先增大后减小。另外将仅考虑微凸体相互作用和既无摩擦又无微凸体相互作用的情况进行了对比分析,进而得到当分形维数D=2.4时,微凸体相互作用会稍微增大接触刚度;当D≥2.5时,微凸体相互作用会减小接触刚度,且减小的程度越来越大;当2.4≤D≤2.9时,微凸体相互作用会减小接触阻尼。此外,将所建模型的仿真计算结果与实验数据进行对比分析,验证了所建模型的正确性。Based on the three-dimensional fractal theory,a fractal model of normal contact stiffness and contact damping of joint surfaces considering simultaneously the influence of the friction and the asperity interaction was established.Through the simulation of the built model,the influence of friction coefficient,fractal dimension,fractal roughness parameter and contact load on contact stiffness and contact damping was analyzed.The results show that the contact stiffness and contact damping of this model increase with the increase of normal load and fractal dimension,and decrease with the increase of the fractal roughness parameter;and the contact stiffness decreases with the increase of friction coefficient,but contact damping increases first and then decreases with the increase of friction coefficient.In addition,the cases of interaction only considering the asperity and interaction without the friction and the asperity are compared and analyzed,and it is concluded that the interaction of asperities can slightly increase the contact stiffness when the fractal dimension D=2.4,and at that time D≥2.5,the asperity interaction can reduce the contact stiffness,and the degree of reduction can become larger and larger.At that time2.4≤D≤2.9,the asperity interaction can reduce the contact damping.In addition,the simulation calculation results of the built model are compared with the experimental data to verify the correctness of the built model.

关 键 词：摩擦 相互作用 结合面 刚度 阻尼 

分 类 号：TH113[机械工程—机械设计及理论]