太原科技大学 机械工程学院,太原 030024
刘宇龙,男,2000年生,江苏宿迁人,硕士研究生;主要研究方向为机械结合面;E-mail:1329878356@qq.com。
收稿:2024-08-22,
修回:2024-12-11,
网络首发:2026-07-17,
纸质出版:2026-07-15
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刘宇龙,兰国生,宋建国,等. 基于椭球微凸体的结合面加、卸载特性研究[J]. 机械强度,2026,48(7):156-165.
LIU Yulong,LAN Guosheng,SONG Jianguo,et al. Research on loading and unloading characteristics of joint surfaces based on ellipsoidal micro⁃asperities[J]. Journal of Mechanical Strength,2026,48(7):156-165.
刘宇龙,兰国生,宋建国,等. 基于椭球微凸体的结合面加、卸载特性研究[J]. 机械强度,2026,48(7):156-165. DOI: 10.16579/j.issn.1001.9669.2026.07.018.
LIU Yulong,LAN Guosheng,SONG Jianguo,et al. Research on loading and unloading characteristics of joint surfaces based on ellipsoidal micro⁃asperities[J]. Journal of Mechanical Strength,2026,48(7):156-165. DOI: 10.16579/j.issn.1001.9669.2026.07.018.
目的
2
针对粗糙结合面微凸体几何形貌非单一性导致接触特性模拟不准确的问题,探究不同离心率下椭球微凸体在法向加、卸载过程中的力学响应机制。
方法
2
首先,基于三维各向异性分形理论与赫兹接触理论,构建了椭球微凸体法向加、卸载动力学模型;然后,分别在微凸体顶端曲率半径取常数、顶端曲率半径随接触面积动态变化(改进模型)两种边界条件下进行了数值仿真;最后,引入灰铸铁磨削结合面的试验数据进行了对比分析,探讨了分形维数与分形粗糙度对接触特性的主导规律。
结果
2
数值模拟与试验验证表明,结合面粗
糙表面上的微凸体由多重复杂的几何形状共同组成。在引入曲率半径随接触面积动态变化的改进模型中,理论预测值与试验曲线吻合良好,加载阶段误差控制在14%以内,卸载阶段误差控制在22%以内。在弹塑性变形的后半段,试验数据明显向离心率
e
为0.5~0.7的椭球仿真曲线靠拢,验证了改进椭球接触模型的合理性与工程参考价值。
Objective
2
To address the inaccurate simulation of joint surface contact characteristics caused by the non-uniform geometric shapes of micro-asperities
the mechanical responses and deformation mechanisms of ellipsoidal micro-asperities with varying eccentricities during the normal loading and unloading processes are investigated.
Methods
2
Firstly
based on the three-dimensional anisotropic fractal theory and Hertzian contact mechanics
a theoretical loading-unloading contact model for ellipsoidal micro-asperities was established. Secondly
numerical simulations were performed under two distinct boundary scenarios: a constant tip curvature radius and a dynamic tip curvature radius varying with the contact area. Finally
test data from a gray cast iron grinding joint surface were introduced to validate the models
and the influences of fractal dimension and fractal roughness on the contact load were analyzed.
Results
2
The comparative analysis demonstrates that the micro-asperities on rough surfaces are composed of multi-shaped geometries rather than a single profile. For the improved model where the curvature radius varies dynamically with the contact area
the simulated curves exhibit excellent agreement with the test data
restricting errors to within 14% during the loading stage and 22% during the unloading stage. In the late elastoplastic stage
the test trajectory shifts toward the ellipsoidal model with eccentricities between 0.5 and 0.7
confirming the higher bi-directional accuracy and physical feasibility of the improved model.
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