共查询到16条相似文献,搜索用时 171 毫秒
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表面粗糙度对微动摩擦特性的影响 总被引:4,自引:0,他引:4
通过实验研究,探讨了表面粗糙度对微动摩擦特性影响的作用。表面粗糙高时接触表面之间的摩擦系数会有明显增加,在微动状态下表面粗糙度对表面磨损影响不大。 相似文献
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扭转复合微动模拟及其试验研究 总被引:2,自引:0,他引:2
基于低速往复回转电动机系统和高精度六维力/转矩传感器,通过改变旋转轴的倾斜角α,成功实现了扭转复合微动,该微动属扭动微动和转动微动模式的复合。并对GCr15钢球/50钢平面在倾斜角度为10°和40°及不同扭转角位移幅值下的扭转复合微动进行初步考察,同时结合光学显微镜、扫描电子显微镜、表面轮廓仪等手段分析50钢的扭转复合微动运行行为、磨痕形貌及损伤机理。结果表明,该试验装置能真实模拟扭转复合微动;倾斜角和角位移幅值对扭转复合微动的运行和损伤行为有重要影响;可利用摩擦力—角位移幅值曲线来表征扭转复合微动行为,50钢摩擦力—角位移幅值曲线呈直线型、椭圆型和平行四边形型3种类型;其损伤特征明显不同于单一运行模式控制(扭动微动或转动微动)下的微动行为。此外,不对称的磨斑形貌是扭转复合微动的一个典型特征。 相似文献
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关于微动磨损与微动疲劳的研究 总被引:18,自引:2,他引:16
微动磨损与微动疲劳是2种主要的微动模式,造成的损伤在工业中相当普遍,并可能引发灾难性的后果。主要研究了们移幅度、压力和疲劳应力3个基本微动参数,并以获得的微动区域、微动图为基础,分析了微动磨损与微动疲劳的运行机制和破坏规律。为更好地了解微动磨损与微动疲劳之间的内在联系,进一步探讨了接触磨损与局部疲劳、局部疲劳与整体疲劳之间的竞争机制。 相似文献
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用超声疲劳试验技术研究了Al-Li8090铝锂合金和Ti-6Al-4V钛合金在20kHz时的微动损伤现象。试验结果表明,在极高频率下,也有微动损伤发生,并可引发疲劳裂纹的萌生和扩展,导致微动疲劳破坏。 相似文献
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对新鲜人股骨皮质骨对纯钛球(直径10mm)接触副,在12mm/min加载速度下,分别以最大法向载荷100,200,300,400N进行径向微动实验研究。在动力学特性分析的基础上,用激光共聚焦显微镜和扫描电镜观察皮质骨表面的磨痕形貌。结果显示:随着载荷的增加,股骨皮质骨表现出不同的界面变形行为,损伤随之加重,而且裂纹的产生存在一个临界载荷;裂纹在骨表面主要有4种生长方式,以沿粘合线生长最常见。讨论了减缓骨/种植体界面径向微动损伤的措施,表明降低界面应力和种植体表面改性有利于减缓骨/种植体界面径向微动损伤。 相似文献
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On the mechanisms of various fretting wear modes 总被引:1,自引:0,他引:1
M.H. ZhuZ.R. Zhou 《Tribology International》2011,44(11):1378-1388
According to relative motion directions for a ball-on-flat contact, there are four fundamental fretting wear modes, e.g., tangential, radial, torsional and rotational modes. In this paper, the mechanisms of these four fundamental fretting wear modes, particularly for the later three modes, have been reviewed from results obtained by the authors in combination with results from literature. Some general features have been reported. Differences both in running and degradation behavior have been discussed in detail. Results showed that some similar laws for three fretting regimes (partial slip regime, mixed regime and slip regime), fretting maps (running condition fretting map and material response fretting map), wear and cracking mechanisms obtained from the classic mode (i.e. tangential fretting) were also identified and useful to characterize the other modes. Nevertheless, the occurrence of relative slip for the radial fretting, the formation of mixed regime for the torsional fretting, the evolution of surface morphology for the rotational fretting were quite different compared to that of the classical fretting mode. 相似文献
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采用面接触扭动微动形式,以动力定位系统可调距螺旋桨桨-毂轴承摩擦副材料(CuNiAl-42CrMo4)为对象,以不同的角位移幅值模拟海水波动影响下的微动磨损行为,并结合扫描电子显微镜和超景深三维显微镜对磨痕形貌进行分析,探究桨-毂轴承摩擦副材料扭动微动磨损规律。结果表明,随着角位移幅值的增加,扭动微动依次运行于部分滑移区、混合区、滑移区,摩擦因数减小,同时磨损量增加,微动损伤中剥层机制所占的比例逐渐增加,且由于疲劳裂纹扩展的不利影响,实际运行过程中要尽量避开混合区。 相似文献
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An apparatus for composite fretting tests on a steel ball opposite to the inclined steel flat with different inclined angles (60° and 45°) have been carried out. During the tests, the maximum imposed loads were varied from 200 N to 400 N and 800 N at a constant loading speed of 12 mm/min. Dynamic analysis in combination with microscopic examinations through optical microscopy, profilometery, and SEM have been performed. Composite fretting behaviour has been analyzed and compared with the conventional fretting. 相似文献
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Three types of surface-treated NiTi samples, M-1 (700 °C/0.5 h), M-2 (650 °C/1 h) and M-3 (400 °C/50 h), were prepared by
ceramic conversion treatment under different conditions. The effect of the surface treatment on the fretting behavior of NiTi
alloy was investigated in the Ringer’s solution by using a horizontal servo-hydraulic fretting apparatus. The experimental
results indicated that the surface layer of the low temperature (400 °C) treated samples M-3 was dominated by a single TiO2 layer, while the high temperature (650 and 700 °C) treated samples M-1 and M-2 consisted of surface TiO2 layer followed by a TiNi3 layer. These surface layers were found to have a strong effect on the fretting behavior of the NiTi alloy in terms of changes
in the shape of the curves of the tangential force (F
t) versus displacement (d), the fretting regimes and the damage mechanisms involved. The stress-induced reorientation of martensite bands in the NiTi
alloy could decrease the slope of the F
t–d curve and thus increase the elastic accommodation ability of the NiTi plate against 1Cr13 steel ball pair. However, since
the surface-treated layers could suppress the martensite reorientation in the NiTi substrate and thus decrease the elastic
accommodation ability of NiTi, the gross slip started at a smaller displacement amplitude for the surface-treated NiTi samples
than for the untreated one. The main wear mechanism of the as-received NiTi alloy in slip regime was adhesion and delamination,
while the major damage to the high temperature treated NiTi samples M-1 and M-2 was determined as the spallation of surface-treated
layers. Due to the high bonding strength of the surface-treated layer with NiTi substrate, the low temperature treated NiTi
samples M-3 showed the best fretting wear resistance in all samples tested. 相似文献
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Shanshan Gao Zhenbing Cai Huixin Quan Minhao Zhu Haiyang Yu 《Tribology International》2010,43(1-2):440-446
Fretting tests were carried out to compare the effect of radial and dual-motion modes on wear of cortical bone. A titanium ball was rubbed against fresh human cortical bone under controlled load and motion test conditions. Dual-motion fretting mode produced more severe damage than radial fretting, with more debris occurring at the worn surface. Cracks were abundant in radial fretting and they were significantly affected by the microstructure of cortical bone; this effect was not obvious in the case of the dual-motion fretting mode. Radial fretting test could be used to evaluate the anisotropy of material and crack propagation of brittle cortical bone. 相似文献