5083铝合金线接触式切向微动磨损行为研究及其数值模拟

发布时间：2018-06-15 12:03

本文选题：铝合金 + 线接触　；参考：《西南交通大学》2014年硕士论文

【摘要】：微动磨损是指接触表面由于小幅振动而产生的一种小位移磨损。微动磨损广泛存在于航空航天、铁路机车和核电工业等领域。微动主要的影响因素包括法向载荷、位移幅值、频率、接触形式、材料特性和表面粗糙度等。目前关于微动磨损研究主要是采取点接触的方式,对线接触的研究相对较少。线接触形式广泛存在于工程实际中,例如轮轴配合、齿轮啮合及销轴连接等。本论文研究5083铝合金/35CrMo钢在线接触形式下的切向微动磨损行为。本文的实验主要是在电磁激振微动磨损试验机上进行的,采用平面(5083铝合金)/圆柱(35CrMo钢)线接触形式。在分析摩擦特性曲线和摩擦系数时变曲线的基础上,研究了位移幅值和法向载荷对微动磨损的影响。试验后对测试试样的磨痕形貌、磨损量及剖面进行分析。最后建立有限元模型,研究5083铝合金接触面的应力状态,并分析了摩擦系数和夹紧力对应力的影响,进一步解释了试验现象。通过以上的工作,本论文主要获得了以下几个结论： 1.本研究获得了5083铝合金/35CrMo钢接触面在线接触条件下微动磨损的运行状态图。在线接触条件下,磨痕表面在部分滑移状态下呈现不连续性,完全滑移状态下磨痕中心比两端严重。微观形貌分析表明,5083铝合金的磨损机制主要为磨粒磨损和剥层。 2.在相同法向载荷的条件下,磨损量(磨损体积、磨损率和平均磨损深度)随着位移幅值的增加而增加。在相同位移幅值的条件下,磨损量随着法向载荷的增加而减少。 3.通过有限元分析获得了5083铝合金微动磨损接触面的应力状态；接触面的应力值随着摩擦系数的增加而增加；夹紧力对接触线方向上的应力分布影响较大。
[Abstract]:Fretting wear is a kind of small displacement wear caused by small vibration of contact surface. Fretting wear is widely used in aerospace, railway locomotive and nuclear power industry. The main factors affecting fretting include normal load, displacement amplitude, frequency, contact form, material characteristics and surface roughness. At present, the research on fretting wear is mainly by point contact, but less on linear contact. Linear contact is widely used in engineering practice, such as wheel shaft fit, gear engagement and pin shaft connection. The tangential fretting wear behavior of 5083 aluminum alloy / 35CrMo steel is studied in this paper. The experiment in this paper is mainly carried out on the electromagnetic excited vibration fretting wear tester. The linear contact form of plane 5083 aluminum alloy / cylindrical steel 35CrMo is adopted. Based on the analysis of friction characteristic curve and friction coefficient time-varying curve, the effects of displacement amplitude and normal load on fretting wear are studied. After the test, the wear trace morphology, wear amount and profile of the test sample were analyzed. Finally, the finite element model is established to study the stress state of 5083 aluminum alloy contact surface, and the effects of friction coefficient and clamping force on the stress are analyzed, and the experimental phenomenon is further explained. Through the above work, this paper mainly obtains the following conclusions: 1. In this paper, the running state diagram of fretting wear of 5083 aluminum alloy / 35CrMo steel is obtained under the condition of on-line contact. Under the condition of on-line contact, the wear scar surface is discontinuous in the partial slip state, and the wear mark center is more serious than the two ends in the complete slip state. The microstructure analysis shows that the wear mechanism of Zu 5083 aluminum alloy is mainly abrasive wear and delamination. 2. Under the same normal load, the wear amount (wear volume, wear rate and average wear depth) increases with the increase of displacement amplitude. Under the same displacement amplitude, the wear loss decreases with the increase of normal load. The stress state of fretting wear contact surface of 5083 aluminum alloy is obtained by finite element analysis. The stress value of contact surface increases with the increase of friction coefficient, and the stress distribution in contact line direction is greatly affected by clamping force.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TG146.21;TH117

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