Fretting wear behavior considering the contact of third body particles
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摘要:
基于有限元方法建立带有第三体颗粒接触作用的球-平面三维仿真模型，研究在部分滑移状态下第三体对微动磨损的影响。分析了线弹性和弹塑性材料本构下第三体颗粒与第一体之间接触行为，确定研究对象材料本构；分析了不同尺寸条件下的第三体颗粒接触行为；研究了不同加载条件下第三体颗粒对微动磨损的影响。结果表明，弹塑性材料更能体现第三体的接触特性，第三体颗粒受到较大的接触压力发生塑性变形，减小了接触面之间的接触压力；直径0.8 μm的第三体颗粒所承受接触压力最大，0.2 μm时接触压力最小，且随着直径增大塑性变形增大；部分滑移状态下，在微动初始阶段第三体颗粒的存在会降低磨损,较小的接触宽度或较大的位移幅值会导致第三体颗粒承受的接触压力减小，摩擦耗散能增大，微动磨损加剧。
Abstract:Based on the finite element method, a ball-plane three-dimensional simulation model with the contact of the third body particles was established. The influence of the third body on fretting wear under partial slip condition was mainly studied. The contact behavior between the third body and the joint surface under the action of linear elastic material and elastic-plastic material was analyzed. The influences of different sizes on the contact behavior of the third body particles were studied. Finally, the effect of third body particles on fretting wear under different loading conditions was studied. The results showed that the elastic-plastic material can better reflect the contact characteristics of the third body. The third body particles were plastically deformed by the larger contact pressure, which reduced the contact pressure between the contact surfaces. The contact pressure of the third body particles with a diameter of 0.8 μm was the largest, and the contact pressure was the smallest at 0.2 μm, and the plastic deformation increased with the increase of diameter. In the initial stage of fretting, the existence of the third body particles could reduce the wear. For partial slip fretting wear, a smaller contact width or a larger displacement amplitude could lead to a decrease in the contact pressure of the third body particles, and an increase in friction dissipation energy and wear.
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Key words:
- third body particles /
- fretting wear /
- partial slip /
- contact width /
- displacement amplitude
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图 1 三维赫兹点接触有限元模型（P为接触压力，S为法向位移）
Figure 1. 3D hertzian point contact FEM （P is the contact pressure and S is the normal displacement）
图 2 有限元模型与理论对比验证
Figure 2. Finite element model and theoretical comparison verification
图 4 最大位移处有限元模型与理论的剪切力比较
Figure 4. Comparison of shear force between finite element model and theory at the maximum displacement
图 5 最大位移处平面模型黏着-滑移区域尺寸
Figure 5. Size of the adhesion-slip region of the plane model at the maximum displacement
图 7 线弹性材料模型中接触中心处接触压力分布
Figure 7. Contact pressure distribution at contact center in linear elastic material model
图 8 线弹性材料模型中第三体颗粒与第一体接触作用
Figure 8. Contact effect between the third body particles and the first body in the linear elastic material model
图 9 双线性运动硬化材料的应力-应变曲线
Figure 9. Stress-strain curve of bilinear kinematic hardening material
图 10 线弹性和弹塑性材料模型中接触压力比较
Figure 10. Comparison of contact pressure in linear elastic and elastoplastic material models
图 11 线弹性和弹塑性材料模型中接触作用力-形变
Figure 11. Contact force-deformation in linear elastic and elastoplastic material models
图 12 不同尺寸第三体颗粒接触情况比较
Figure 12. Comparison of contact conditions of third body particles with different sizes
图 13 一个循环周期中第三体颗粒接触应力云图变化
Figure 13. Change of contact stress cloud diagram of the third body particles in a cycle
图 14 有无第三体颗粒存在时微动循环图比较
Figure 14. Comparison of fretting cycle diagrams with and without third body particles
图 16 不同接触半宽下第三体颗粒对微动磨损的影响
Figure 16. Effect of the third body particles on fretting wear under different contact half widths
图 17 不同位移幅值下第三体颗粒对微动磨损的影响
Figure 17. Effect of third body particles on fretting wear under different displacement amplitudes
表 1 微动磨损模型中的相关参数
Table 1. Parameters used in the fretting wear analysis
参数 值 最大赫兹接触压力Pmax/GPa 1.2 赫兹接触半宽a/μm 120 黏着区域尺寸/c/μm 92 位移幅值S/μm 0.5 摩擦因数μ 0.6 
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