摘要
目的研究不同分形参数下表面粗糙度对微动接触表面温升的影响。方法通过创建Python脚本,将MATLAB中利用Weierstrass-Mandelbrot函数构造的分形表面轮廓坐标导入ABAQUS中,使用样条曲线拟合轮廓坐标,构建包含粗糙表面的二维柱面-平面接触模型,研究表面粗糙度、法向载荷、切向载荷以及材料属性对接触表面温升的影响规律。结果微动接触状态下,温升在接触宽度方向上呈先增后减的趋势,且沿深度方向温升幅值逐渐减小。不同粗糙度的表面节点具有相似的温升分布历程,热影响区主要分布于接触区表层附近,并在此表层产生高的温度场。粗糙接触模型会出现局部温升峰值,同时剪切摩擦应力和接触压力分布具有离散性,与文献中已有结论一致。结论接触表面温升幅值随着粗糙度的增大而增大。当表面粗糙度和法向载荷一定时,随着切向载荷幅值的增大,上试件的相对滑移距离和摩擦热产生率增加,引起温升幅值增大。考虑材料属性时,发现温升幅值大小与材料导热性密切相关,材料导热性能越好,接触表面温升幅值越小。
The work aims to study the effect of surface roughness on the temperature rise of the micro-motion contact surface under different fractal parameters. By creating a Python script, the fractal surface contour coordinates constructed by Weierstrass-Mandelbrot function in MATLAB were imported into ABAQUS, and the spline curves were used to fit the contour coordinates. A two-dimensional cylindrical-plane contact model with rough surface was constructed and the influence of roughness, normal load, tangential load and material properties on the temperature rise of the contact surface was studied. The temperature rise first increased and then decreased in the contact width direction and amplitude decreased gradually along the depth direction in the micro-motion contact state. The surface nodes with different roughness had similar temperature rise distribution history and thermal influence area was mainly distributed near the surface and generated a high temperature field of the contact area. The local temperature rise peak appeared in the rough contact model, and the shear friction stress and the contact pressure distribution were discrete, consistent with the conclusions in the literature. The temperature rise amplitude of contact surface increases with the increase of roughness. The relative slip distance and friction of the upper test piece increase with the increase of the tangential load amplitude when the surface roughness and normal load are constant, thus causing an increase in temperature rise amplitude. In terms of the material properties, the magnitude of the temperature rise is closely related to the thermal conductivity of the material. The better the thermal conductivity of the material is, the smaller the temperature rise amplitude of the contact surface is.
作者
李玲
田海飞
云强强
麻诗韵
李治强
LI Ling;TIAN Hai-fei;YUN Qiang-qiang;MA Shi-yun;LI Zhi-qiang(School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第6期238-244,共7页
Surface Technology
基金
国家自然科学基金资助项目(51305327,51475352)
陕西省自然科学基金资助项目(2018JM5066)~~
关键词
柱面-平面接触模型
微动接触
分形理论
粗糙度
温升
cylindrical-plane contact model
fretting contact
fractal theory
roughness
temperature rise
