共查询到19条相似文献,搜索用时 66 毫秒
1.
刘洪志 《中国制造业信息化》2009,38(9):65-67,70
针对机械产品中大量存在的磨损失效问题,分析了常见的磨损失效类型及其主要影响因素,给出了国内外目前主要的计算磨损量的数学模型,最后结合算例对机构磨损可靠性的计算模型进行了阐述。 相似文献
2.
刘洪志 《机械设计与制造工程》2009,(9):65-67
针对机械产品中大量存在的磨损失效问题,分析了常见的磨损失效类型及其主要影响因素,给出了国内外目前主要的计算磨损量的数学模型,最后结合算例对机构磨损可靠性的计算模型进行了阐述。 相似文献
3.
4.
磨损的随机模糊失效概率计算方法 总被引:2,自引:0,他引:2
首先对磨损量的分布进行了计算分析,得出了体积磨损量服从正态分布的结论,然后提出了模糊磨损失效状态的概念,给出了只考虑磨损随机性和同时考虑随机性与模糊性的磨损失效概率的计算方法,讨论了不同参数的变化对磨损安全的影响。此计算方法不仅可以用于单个失效模式,而且可以推广至系统分析的多个失效模式。 相似文献
5.
基于ADAMS的某型炮闩系统关键件磨损寿命计算 总被引:2,自引:0,他引:2
基于ADAMS建立了以碰撞为特征的某型炮闩系统虚拟样机平台,分析了炮闩系统中关键件的磨损对炮闩动作的影响,提出了磨损失效是炮闩故障的主要模式;借助磨损试验机获得了配对材料副的磨损规律,并基于虚拟样机获得的载荷谱和运动学参量,计算出挡弹机构凸轮外廓的磨损失效寿命,填补了当前对于磨损研究多停留在实验状态,没能切实用于工程实际磨损计算的空白. 相似文献
6.
7.
针对多型采用O形密封圈的产品磨损失效且无相关磨损仿真手段的现状,基于ARCHARD的摩擦磨损模型,利用ANSYS软件结构分析与热分析功能,提出了一种用于进行O形密封圈磨损仿真计算的方法。仿真过程中综合考虑了接触压力和摩擦热对摩擦磨损的影响,采用网格重构的方法解决了仿真过程中难于对材料磨损进行模拟的问题,并将仿真过程以编程的方式实现。结合工程实际,提出了判断O形密封圈磨损失效的依据。给出了应用此方法进行计算的具体算例。 相似文献
8.
9.
10.
11.
In ball-cratering wear tests, two abrasive wear modes are commonly observed, grooving abrasion and rolling abrasion, which act in distinct areas. Observing this tendency, the aim of this article is to discuss the characterization of an intermediate condition, in which the superposition of the grooving and the rolling abrasive wear modes is observed. This phenomenon is referred to as microrolling abrasion due to the following particular characteristic: the rolling abrasion was found to act on the grooving abrasion. Additionally, in a defined sliding distance range and normal force range, microrolling abrasion is qualitatively observed to be proportional to the sliding distance and inversely proportional to the normal force. 相似文献
12.
Machinery and equipment used in abrasive environments, such as the mining industry, suffer from severe wear. In order to understand wear and to prolong the life time of the machinery, it is important to understand how materials respond to wear depending on the environmental and tribological conditions imposed.This paper exposes a comparative study between the influence of two abrasive environments (dry and slurry) on hard particle coatings and steels. To study this, the 3-body wear behaviour was evaluated in a dry environment using a continuous abrasion test (CAT) and in a slurry environment using a slurry steel wheel abrasion test (SSWAT) method. Both tests are capable of experimentally modelling the high stress wear at 45 N and 216 N, using quartz sand as an abrasive. The tests were performed on two types of coatings processed by sintering and hardfacing and martensitic steel was used as a reference. The wear was indicated as volume loss by measuring the samples before and after the tests. Furthermore, the specific wear energy was calculated in order to have a fundamental understanding about the material's response to wear. A correlation between the wear rate and the particle brakeage index (PBI) was done for the dry conditions using different loads, in order to explain the interdependence between the two parameters and the change in the wear mechanism between the two loads. The influence of load on the wear of the materials showed different wear mechanisms on coatings compared to the steel in the same environmental conditions. However, a change in wear mechanism at different load levels was observed, which might be directly dependent on the change of the particle's motion from sliding to rolling combined with the change in their shape and size. The results showed that the need to study the influence of different abrasive conditions on the material wear is crucial in order to improve the lifetime and the cost efficiency of the machinery used in such environments. The hard-particle coatings showed comparatively low wear rates promising a great potential in improving the lifetime of industrial equipments in different environments. 相似文献
13.
14.
Abrasion resistance of nanostructured and conventional cemented carbides 总被引:10,自引:0,他引:10
The abrasion resistance of nanostructured WC-Co composites, synthesized by a novel spray conversion method, is determined and compared with that of conventional materials. Scratching by diamond indenter and abrasion by hard (diamond), soft (zirconia) and intermediate (SiC) abrasives was investigated. The size of the scratch formed by the diamond is simply related to the hardness of the composite. Plastic deformation, fracture and fragmentation of the WC grains increase with their size. Nanoscale composites show purely ductile scratch formation. Nanocomposites possess an abrasion resistance approximately double that of the most resistant conventional material: this is a higher gain than the increase in hardness which is at most 23%. This large gain is due to a specific grain size effect on abrasion resistance in the case of diamond and SiC abrasive and to a very rapid increase of abrasion resistance with hardness in the case of the softer (SiC and ZrO2) abrasives. The observation of the abraded surfaces of conventional composites reproduced the known mechanisms: plastic deformation and fracture of WC grains by hard abrasives; removal of binder phase and fall-out of WC by soft abrasives. Magnetic fields from the ferromagnetic Co prevent the observation of abrasion mechanisms in the very fine-structured nanocomposites. 相似文献
15.
16.
Total hip arthroplasty is a highly successful procedure where the hip joint is replaced by an artificial ball and socket joint. Bearing wear continues to be a contributing factor to implant failure. Prosthetic femoral heads roughen in vivo which leads to increased wear. Along with the introduction of improved polyethylene which reduces wear by up to 99%, improved femoral head materials have been introduced to improve resistance to abrasion. The abrasion resistance of two of these improved femoral heads was assessed in this study and compared to a cobalt chromium (CoCr) femoral head. The resulting wear performance against a polyethylene acetabular component was assessed. The bulk ceramic (zirconia toughened alumina) femoral head exhibited superior abrasion resistance compared to CoCr (97% reduction in damage) as well as reduced wear after abrasion (97% reduction in wear). The oxide coated zirconium niobium femoral head showed inferior abrasion resistance compared to CoCr (99% increase in damage) as well as increased wear after abrasion (161% increase in wear). Both femoral head surfaces utilize hard ceramic materials, however, the thin ceramic coating on top of a softer metallic substrate of the oxide coated bearing was unable to withstand aggressive abrasion. 相似文献
17.
The abrasion properties of a series of cemented carbides with different carbide grain sizes, different amounts and types of binder phases have been investigated under varied conditions. Abrasion results from other works are also incorporated for comparison reasons. The results are interpreted in the light of a previously published model for the abrasion properties of multiphase materials, although this is the first time this model is applied to materials with very high amounts of hardphase. It is confirmed that the abrasion resistance of tungsten carbide–cobalt materials may vary considerably, also for fixed amounts of metal and hardphase. Not only the wear resistance level but also the ranking depends both on the test conditions and on the microstructure. It is further showed that some nano-crystalline materials posses a wear resistance superior to those of the pure carbide material. 相似文献
18.
煤矿机械磨损失效分析方法和抗磨措施 总被引:4,自引:0,他引:4
为了降低煤矿机械零部件的磨损,提高使用寿命和可靠性,分析了煤矿机械的工况特点和磨损特性,总结了磨损失效分析的一般方法,提出了抗磨措施。 相似文献
19.
Materials working in slurries containing seawater and abrasive particles degrade gradually because of the synergic effects of mechanical wear and electrochemical corrosion. In this study, the abrasion–corrosion behaviors of a steel–steel tribopair in an environment with artificial seawater and SiO2/Al2O3 particles were investigated. Corrosion is responsible for surface degradation at low concentrations of SiO2 particles, whereas abrasion is the primary cause for steel damage at high SiO2 concentrations. When Al2O3 particles were used, abrasion was found to be the dominant factor for material loss at all concentrations. Results from this study indicate that at low concentrations of hard particles, abrasion–corrosion behavior is determined by the properties of particles. 相似文献