共查询到19条相似文献,搜索用时 109 毫秒
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以销-盘互换试验为基础,通过对比销-盘材料分别为42CrMoV-Stellite6和Stellite6-42CrMoV时,摩擦因数与磨损体积随速度、磨程的变化规律,研究钴基合金Stellite6的摩擦磨损性能。试验结果表明,Stellite6的摩擦因数随滑动速度的增大而减小,随磨程的增加逐渐增大之后达到稳定状态;磨损体积随速度和磨程的增大而增大,跑合阶段与稳定磨损阶段的分界点随速度的增大而减小。销-盘材料为42CrMoV-Stellite6较之销-盘材料为Stellite6-42CrMoV,摩擦因数与磨损体积差别很大,在工程应用中,需要根据实际工况,设计与之具有相同接触特征的试验以获得材料的摩擦磨损性能。 相似文献
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利用数值仿真技术,以销盘磨损试验为研究对象,采用VB编程语言开发了一套包括接触应力仿真和磨损仿真模块的数值仿真软件.应力仿真模块中,销盘接触的各向应力仿真值与ANSYS有限元分析软件的计算结果比较,两者误差很小;销盘磨损仿真结果通过销盘滑动磨损试验给予了验证.仿真结果表明,该仿真软件在实现销盘接触应力和同工况下的磨损仿真计算是可行的. 相似文献
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销-盘磨损试验涉及复杂的热-应力-磨损耦合现象。基于广义Archard磨损模型和商用有限元软件ABAQUS,开发模拟销-盘磨损试验过程中热-应力-磨损耦合模拟分析的顺序耦合方法。分析销-盘试验的瞬态温度场,将温度场作为热载荷分析摩擦副的应力-磨损耦合问题;分析过程中考虑温度对摩擦副材料的力学和热学性能的影响以及广义Archard磨损系数和摩擦因数对温度和接触压力的依赖性。热传导分析考虑摩擦生热、销-盘接触传热、各个表面与空气之间的强制对流换热、自然对流换热以及热辐射。将该方法用于销-盘磨损试验的模拟,得到温度场、接触压力和磨损量的演变过程,揭示温度场对接触和磨损的影响规律,仿真结果与试验结果吻合良好。 相似文献
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《机械科学与技术》2017,(6):869-876
针对某大型断路器机构系统磨损试验成本高的特点,通过建立磨损预测模型,对其传动机构危险关节的磨损量进行了预测分析。基于2种典型的预测模型建立方法,采用销盘磨损实验数据,分别建立磨损预测模型。对比分析表明Elman网络模型的预测精度较高,可准确的反映磨损率与接触压力、相对滑动速度和材料硬度之间的规律。考虑运动副间隙的存在,基于非线性弹簧阻尼模型,利用ADAMS软件仿真获得传动机构危险关节的动力学参数。基于Hertz接触理论对动力学参数进行变换,并将其作为预测模型的输入信息,对关节的磨损进行预测计算。通过迭代分析,发现随着断路器开断次数的增加,轴套表面一些特定位置的磨损越来越严重。对比采用固定系数下的Archard模型,表明预测模型计算的结果对磨损失效判定更具参考价值。 相似文献
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为提高基于磨粒的机器状态监测的准确性,研究了磨粒特征随滑动磨损进程的变化规律.在球一盘磨损试验机上模拟可靠润滑和润滑不足2种工况下的摩擦磨损试验,分析了磨损过程中不同磨损阶段的磨粒尺寸分布和磨粒表面粗糙度,探讨了磨损进程中磨粒尺寸分布与磨粒表面粗糙度之间的关系.研究结果表明磨损进程中的磨粒特征的变化对机器状态监测极为有效. 相似文献
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《Wear》2007,262(5-6):672-683
In this paper a boundary element formulation for three-dimensional sliding wear problems is presented. In the proposed formulation, the wear problem is described by modified boundary integral equations to include sliding wear. A linear wear law is used to model wear and an incremental sliding technique is adopted to solve the non-linear wear problem. Both cases, of one and both bodies losing material are investigated. The proposed method is validated initially by analysing the classic problem of pin-on-disc wear experiment and is subsequently applied to a total hip arthroplasty wear problem.The analysis demonstrates that the proposed boundary element formulation is efficient for solving sliding wear problems and particularly for cases involving complicated geometries, such as the artificial hip joint. Due to the boundary only modelling requirement, the computational effort remains low. In case of incrementing the sliding distance in advance, some optimization of the increment size must be carried out for the total CPU time to remain low and the final geometries of the bodies to be smooth. Using an optimum increment formulation, the solution speeds up as the sliding increments increase without great loss of accuracy. 相似文献
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In the present study, the effect of the combined addition of boron (B) and strontium (Sr) on the high-temperature dry sliding wear behavior of A356 alloy has been investigated using a pin-on-disc wear testing machine attached with a furnace. During wear studies, the effect of alloy composition, normal pressure, sliding speed, and sliding distance on A356 alloy at four temperatures, namely, room temperature and 100, 200, and 300°C, have been investigated. Further, the cast alloys and worn surfaces of A356 alloy with and without B and Sr were characterized by scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) microanalysis. Results indicate that the combined addition of B and Sr to A356 alloy has led to improvements in wear properties. This is due to a change in microstructure, improvement in mechanical properties, and the formation of an oxide layer between the mating surfaces during the sliding wear process. 相似文献
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Investigations on the influence of graphite filler on dry sliding wear and abrasive wear behaviour of carbon fabric reinforced epoxy composites 总被引:1,自引:0,他引:1
In this experimental study, the dry sliding wear and two-body abrasive wear behaviour of graphite filled carbon fabric reinforced epoxy composites were investigated. Carbon fabric reinforced epoxy composite was used as a reference material. Sliding wear experiments were conducted using a pin-on-disc wear tester under dry contact condition. Mass loss was determined as a function of sliding velocity for loads of 25, 50, 75, and 100 N at a constant sliding distance of 6000 m. Two-body abrasive wear experiments were performed under multi-pass condition using silicon carbide (SiC) of 150 and 320 grit abrasive papers. The effects of abrading distance and different loads have been studied. Abrasive wear volume and specific wear rate as a function of applied normal load and abrading distance were also determined.The results show that in dry sliding wear situations, for increased load and sliding velocity, higher wear loss was recorded. The excellent wear characteristics were obtained with carbon-epoxy containing graphite as filler. Especially, 10 wt.% of graphite in carbon-epoxy gave a low wear rate. A graphite surface film formed on the counterface was confirmed to be effective in improving the wear characteristics of graphite filled carbon-epoxy composites. In case of two-body abrasive wear, the wear volume increases with increasing load/abrading distance. Experimental results showed the type of counterface (hardened steel disc and SiC paper) material greatly influences the wear behaviour of the composites. Wear mechanisms of the composites were investigated using scanning electron microscopy. Wear of carbon-epoxy composite was found to be mainly due to a microcracking and fiber fracture mechanisms. It was found that the microcracking mechanism had been caused by progressive surface damage. Further, it was also noticed that carbon-epoxy composite wear is reduced to a greater extent by addition of the graphite filler, in which wear was dominated by microplowing/microcutting mechanisms instead of microcracking. 相似文献
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The sliding wear behaviour of zinc–nickel electrodeposited coatings on mild steel substrates was investigated using a spherical pin-on-disc apparatus. The pin materials were alumina and hardened steel. The composition of the coatings was the following: 86 wt% zinc–14 wt% nickel. The friction coefficient of zinc–nickel coating against alumina counter spheres was found to be higher than that against hardened steel counter spheres. The weight loss of zinc–nickel coating after sliding against hardened steel counter spheres was found to be lower than that against alumina counter spheres. The main wear mechanism of the zinc–nickel coating sliding against stainless steel was noted to be severe shearing of the surface layers of the coating due to the ploughing action of the steel pins. For the wear experiments of zinc–nickel coatings against alumina spheres, a surface delamination mechanism is proposed to be the predominant wear mechanism of the coatings. 相似文献
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《Tribology - Materials, Surfaces & Interfaces》2013,7(4):147-154
AbstractPresent investigation deals with the wear behaviour of conventional cast Mg–5%Sn and Mg–5%Sn–2%Mm (Mm is misch metal) (wt.%) alloys studied through pin-on-disc wear experiments at four different loading conditions under ambient temperature. This study reports the effects of external applied load on the dry sliding wear rate and co-efficient of friction of both the alloys. It has been investigated that the volumetric wear loss increases with increasing applied load. It has also been found that the wear rate of Mg–5%Sn–2%Mm alloy is less than that of Mg–5%Sn alloy. The wear mechanism has also been studied through extensive scanning electron microscopy imaging. It has been investigated that wear occurs by delamination of flakes and ploughing (i.e., asperities). 相似文献