沟槽型织构表面对摩擦界面力及磨损特性的影响

发布时间：2018-05-09 19:57

本文选题：表面织构 + 沟槽　；参考：《西南交通大学》2017年硕士论文

【摘要】：两个接触的物体在发生相对运动时会引起界面的摩擦磨损,界面的摩擦磨损是影响各种装备正常安全服役问题的关键要素,有效地调控界面摩擦及磨损有助于提高设备运行的可靠性、延长使用寿命以及节约能源和原材料。界面摩擦磨损受到温度、湿度、相对滑动速度、表面粗糙度、法向载荷、磨屑颗粒以及表面形貌等诸多因素的影响。表面经织构化处理后能够有效地改变表面的几何形貌,引起了摩擦界面接触状态的变化,从而对界面摩擦学特性有着重要的影响作用。但是关于织构表面是如何影响界面的摩擦学特性,即影响机理方面的研究相对较少。因此,开展织构表面是如何影响界面的摩擦学特性的研究工作具有重要的意义,为织构表面的优化设计提供了重要的理论依据。本文在盘试样表面加工出具有不同宽度的沟槽型织构表面和单根沟槽表面试样,在球-面/面-面两种不同的接触模式下首先分别考察了沟槽型织构表面对界面摩擦学特性的影响,然后再利用单根沟槽表面试样深入研究了沟槽的存在对界面摩擦力学特性和动态特性的影响,从而揭示了沟槽型织构表面对界面摩擦学特性的影响机理。主要结论如下:1、在本研究所选试样几何参数及试验条件下,无论球-面接触还是面-面接触,经沟槽织构化表面处理的盘试样均能显著地改变界面的摩擦学特性,且特定尺寸参数的沟槽型织构表面能够在一定程度上降低界面的摩擦系数。2、沟槽的存在改变了摩擦界面的接触状态,从而引起了界面的法向位移和力信号产生突变,且随着沟槽宽度的增大,沟槽对界面接触状态的影响越明显,界面法向位移和法向力信号的变化亦越明显。但接触方式的不同,沟槽对界面接触状态的影响存在一定的差异:在球-面接触中,沟槽的存在主要打断了界面的连续接触,从而导致了界面法向位移、力信号的变化;在面-面接触中,沟槽的存在主要改变了界面的接触面积,导致界面上接触应力的分布发生了转移,从而使得界面的力信号发生变化。3、沟槽棱边对摩擦界面存在刮擦的作用,能够起到清理界面磨屑的作用,从而减轻了磨屑对界面的负面影响,进而改善了界面的摩擦学特性,但具有特定宽度的沟槽型织构表面才能有效地改善界面的摩擦学特性。在球-面接触中,随着沟槽宽度增大,沟槽棱边对摩擦界面的刮擦作用将逐渐演变成强烈的撞击作用,从而加剧了界面的磨损;在面-面接触中,随着沟槽宽度的增大,界面力信号的变化越明显和沟槽棱边对界面的刮擦作用越强烈,这可能会加剧对摩副的磨损。因此,需合理的设计沟槽的尺寸参数,才能充分的发挥沟槽型织构表面对界面的影响作用,进而改善摩擦界面的摩擦学特性。
[Abstract]:The friction and wear of two contact objects will cause the friction and wear of the interface when they are in relative motion. The friction and wear of the interface is the key factor that affects the normal and safe service of all kinds of equipment. The effective control of interface friction and wear can improve the reliability of the equipment, prolong the service life and save energy and raw materials. Interface friction and wear are affected by temperature humidity relative sliding velocity surface roughness normal load debris particles and surface morphology. After texture treatment, the surface geometry can be changed effectively, which leads to the change of the contact state of the friction interface, which has an important effect on the tribological properties of the interface. However, there are few studies on how the texture surface affects the tribological properties of the interface, that is, the influence mechanism. Therefore, it is of great significance to study how the texture surface affects the tribological properties of the interface, which provides an important theoretical basis for the optimal design of the texture surface. In this paper, grooved texture surfaces with different widths and single grooves surface samples were machined on the surface of disk specimens. The influence of grooved texture surface on the tribological properties of the interface was investigated in two different contact modes. Then, the influence of grooves on the tribological and dynamic properties of the interface was studied by using the single groove surface specimen, and the influence mechanism of the grooved texture surface on the tribological properties of the interface was revealed. The main conclusions are as follows: 1. Under the geometric parameters and experimental conditions, the tribological properties of the interface can be significantly changed by the groove-textured surface treated disk specimen, regardless of the spherical contact or the surface-to-surface contact. And the surface of grooved texture with specific dimension parameters can reduce the friction coefficient of interface to a certain extent. The existence of groove changes the contact state of friction interface, which causes the abrupt change of normal displacement and force signal of interface. With the increase of groove width, the influence of groove on interface contact state is more obvious, and the change of interface normal displacement and normal force signal is more obvious. However, the influence of grooves on the interface contact states is different with different contact modes: in the spherical and surface contact, the existence of grooves mainly interrupts the continuous contact of the interface, which leads to the change of the normal displacement and the force signal of the interface; The existence of grooves mainly changes the contact area of the interface, which leads to the transfer of the contact stress distribution on the interface, which makes the force signal of the interface change .3. the groove edges scratch the friction interface. It can clean up the debris of the interface, thus reduce the negative effect of the debris on the interface, and then improve the tribological properties of the interface. However, the surface of the groove texture with specific width can effectively improve the tribological properties of the interface. In ball-surface contact, with the width of groove increasing, the scratching action of groove edge on the friction interface will gradually evolve into a strong impact action, thus exacerbating the wear of the interface, and in the face surface contact, with the increase of groove width, The more obvious the change of the interface force signal and the stronger the scratching effect of the groove edge on the interface, the more serious the wear of the friction pair may be. Therefore, it is necessary to design the dimension parameters of the grooves reasonably in order to give full play to the effect of the groove texture surface on the interface, and then improve the tribological characteristics of the friction interface.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH117

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