共查询到20条相似文献，搜索用时 937 毫秒
1.
《武汉工程职业技术学院学报》2019,(4)
某炼钢厂高压循环水泵作为输送高压水蒸气的动力源在使用两个月后发生轴承抱死失效。失效轴承为6315深沟球轴承,其保持架完全断裂并烧损变形,部分滚动体破裂,表面有不同程度损伤。对6315深沟球轴承失效故障的机理进行了分析,对轴承进行了宏观失效分析、微观失效分析、断裂有限元模拟工况分析,得出轴承失效原因为疲劳断裂和高温磨损。 相似文献
2.
油管的服役条件往往严酷复杂，油管接口螺纹处是油管最薄弱的环节。其接口损伤表现出各种各样的失效形式。本文论述了目前油管接口损伤的主要形式和特点，分析了影响油管接口损伤的主要因素，从工程应用角度出发，指出了预防油管接口产生粘扣、泄漏、滑脱和断裂的主要措施。 相似文献
3.
油管的服役条件往往严酷复杂,油管接口螺纹处是油管最薄弱的环节。其接口损伤表现出各种各样的失效形式。本文论述了目前油管接口损伤的主要形式和特点,分析了影响油管接口损伤的主要因素,从工程应用角度出发,指出了预防油管接口产生粘扣、泄漏、滑脱和断裂的主要措施。 相似文献
4.
飞机机轮轮毂安装螺栓是重要的结构承力件,强度高,对裂纹敏感,一旦使用中出现裂纹将快速扩展直至断裂,对飞行安全构成较大威胁。在对近年来发生的十余起机轮螺栓断裂失效事件从失效模式、失效原因进行深入分析的基础上发现,无论疲劳、氢脆还是应力腐蚀,除与设计、选材、加工工艺有关外,还与应力水平的高低密切相关,以此结合机轮维修装配工艺过程,提出了一系列降低螺栓工作应力水平的措施并运用于机轮维修实践,显著降低了螺栓断裂的风险。 相似文献
5.
伏可夫 《兰州石化职业技术学院学报》2008,8(4):49-51
汽车半轴在汽车运行中受力复杂,易损坏引发安全事故。针对标致307前驱动半轴所发生的突然断裂,分析了半轴断裂的机理,并从设计、制造和结构方面阐述了断裂失效的可能性,进而判定半轴是以疲劳断裂为主的失效模式。在此基础上,提出了防范和改进措施,以达到减少此类断裂失效的目的。 相似文献
6.
通过对失效破损的油管螺纹进行外观形貌、螺纹检验、机械性能、化学成分分析、金相组织及井下工况分析,研究螺纹失效的主要原因,并提出了相应的改进措施,为油田今后避免类似井下作业事故的发生提供了有效的依据。 相似文献
7.
应力腐蚀断裂是焊接结构断裂失效的重要原因之一,这种断裂失效呈脆断特点,易导致灾难性后果.探讨应力腐蚀裂纹的产生、开裂的机理及其影响因素,并提出控制焊接结构发生应力腐蚀断裂的措施. 相似文献
8.
本文通过对一系列球磨机断裂失效事例的分析，认为球磨机简体断裂失效的主要原因是疲劳失效，并针对不同结构的球磨机简体提出了相应的改进方法，取得了良好的实用效果。 相似文献
9.
采用宏观及显微组织分析、扫描电镜分析和力学性能试验等方法对传动轴的断裂进行了失效分析。结果表明,该轴断裂属疲劳失效,轴端部键槽处在制造过程中存在淬火裂纹是导致疲劳断裂的主要原因。 相似文献
10.
高压输电线路导线跌落非线性动响应分析(英文) 总被引：1，自引：0，他引：1
为了研究机械性故障对高压输电线路耦合体系的受力影响,建立了输电线路耐张段的非线性耦合体系模型,通过导线找形非线性静力计算确定了耐张段的初始平衡状态.采用瞬态动力分析方法计算了导线、绝缘子破坏失效危险工况下的输电线路耦合体系非线性动响应.分析结果表明,上横担一组导线断裂失效对邻近端导线张力没有明显影响,对邻近端的绝缘子及铁塔横担构件的受力有较大的影响;上横担一组绝缘子破坏失效后,破坏档未破坏端导线的张力超过了技术规程中的设计值;导线的跌落对破坏档未破坏端的上横担绝缘子受力有较大的影响,而对上横担铁塔杆件没有明显的影响;在架空送电线路的设计中应该考虑绝缘子断裂的荷载工况.研究成果可为输电线路结构设计提供理论依据. 相似文献
11.
炼油厂许多主蒸汽管线 ,直经和质量较大 ,管线在管架上常被拉裂。针对该问题设计的滑动管托 ,解决了这一难题 相似文献
12.
In petrochemical plant, the in-operation repairing is usually a repairing strategy with pressured inoperation repairing for avoiding huge economic losses caused by unplanned shutdown when some slight local leakage happens in pipes. This paper studies the effects of repairing strategies on the failure probability of the pipe systems in process industries based on the time-average fault tree approach, especially the in-operation repairing strategies including pressured in-operation repairing activities. The fault tree model can predict the effect of different repairing plans on the pipe failure probability, which is significant to the optimization of the repairing plans. At first pipes are distinguished into four states in this model, i.e., successive state, flaw state, leakage state and failure state. Then the fault tree approach, which is usually applied in the studies of dynamic equipment, is adopted to model the pipe failure. Moreover, the effect of pressured in-operation repairing is also considered in the model. In addition, this paper proposes a series of time-average parameters of the fault tree model, all of which are used to calculate node parameters of the fault tree model. At last, a practical case is calculated based on the fault tree model in a repairing activity of pipe thinning. 相似文献
13.
Liu Zuozhen 《大连大学学报》1995,(1)
该自控系统成功地运用台湾MEKON M28P型PC机,实现对长6米直径0.14米波纹管的加热、扩口及成型加工自动控制。具有扩口加工自动循环、翻管自动循环和点动调整三种工作方式;具有自动诊断、故障报警并显示故障部位、监控八处工作等多种功能;“加热时间”和“扩口时间”,可由指拨器在现场随时调节。自动工作循环周期为一分钟。 相似文献
14.
某汽车配件公司生产汽车油管发生折弯开裂现象,采用金相显微镜和扫描电镜等对油管进行观察并分析开裂原因。结果表明:原双层卷焊管表面存在细小裂纹,在折弯过程中,裂纹在外力作用下发生了扩展,最终导致开裂。 相似文献
15.
This paper describes a novel design for the carrier mechanism of a pipe-inspection micro robot. Based on this mechanism, a new
micro robot for the pipes with diameter of 20mm has been developed. It can travel through both vertical pipes and curved pipes to make
possible inspection that would be difficult with conventional endoscopes. This mechanism is composed of three units, two novel micro
mechanisms called as a planetary wheel mechanism for robot drive, two micro electromagnetic motors and a flexible coupler. 相似文献
16.
饶丹珍 《郧阳师范高等专科学校学报》2005,25(6):85-89
石油是不可再生的重要战略资源,是中国国民经济持续发展的基础。近年来,随着经济的不断发展,中国的石油需求量也逐年攀升。进口石油或者修建管道,都只是解决问题的一个方面、一种手段。我们万万不能忽视解决问题的另一个方面,即节油和寻求新能源。研究开发先进的节油和替代燃料技术,同时及时引进世界先进的节油技术,提高国人对石油的忧患意识,开源节流显得尤为重要。 相似文献
17.
Water distribution networks are essential components of water supply systems. The combination of pipe structural deterioration and mechanics leads to the failure of pipelines. A physical model for estimating the pipe failure must include both the pipe deterioration model and mechanics model. Winkler pipe-soil interaction （WPSI）, an analytical mechanics model developed by Rajani and Tesfamariam （2004）, takes external and internal loads, temperature changes, loss of bedding support, and the elastoplastic effect of soil into consideration. Based on the WPSI model, a method to evaluate the elastic and plastic areas was proposed in the present study. An FEM model based on pipe-soil interaction （PSI） element was used to verify the analytical model. Sensitivity analyses indicate that the soft soil, long pipe and high temperature induced the axial plastic deformation more likely, which, however, may not occur in normal scenarios. The soft soil, pipes in small diameters, long unsupported bedding are prone to form flexural plastic area. The results show that the pipes subjected to the same loads have smaller stresses in the elastoplastic analysis than elastic analysis. The difference, however, is slight. 相似文献
18.
XU Jing-jing WU Yi-min School of Electromechanical Engineering Automation Shanghai University Shanghai China 《上海大学学报(英文版)》2000,(Z1)
l lgtroductionIt is well known that the safety of pipeline systemsfor transpofting oil or gas is very important in the oil orgas industry, and it will be a catastTophe if an accidentoccurs. Howevef, there are a lot of methods for ensuringthe safety of such pipeline systems, for instance,TopRAM program['] (TransCanada Pipeline RiskAssessment Model), IAP program['] (The integrityAssessment Program), In-line inspection tools for crackdetection in gas and liquid pipeline['l etc. The safety … 相似文献
19.
Three-way pipes, T and Y pipes, are very important connecting components in pipeline systems, their strength are related to the
safety of pipelines. In the case that crack is not detected in the three-way pipe, ANSYS finite element program version 5.6 is applied to study
the stress distribution of the three-way pipe and to obtain the optimum fillet radius in the crotch region of the two pipes. The reasonable
intersection angle φ of the two pipes is also obtained. In the case that a surface crack is detected in the three-way pipe, the maximum stress
intensity factor (SIF) near the front of the surface crack is studied. 相似文献
20.
The multi-piped freezing method is usually applied in artificial ground freezing (AGF) projects to fulfill special construction requirements, such as two-, three-, or four-piped freezing. Based on potential superposition theory, this paper gives analytical solutions to steady-state frozen temperature for two, three, and four freezing pipes with different temperatures and arranged at random. Specific solutions are derived for some particular arrangements, such as three freezing pipes in a linear arrangement with equal or unequal spacing, right and isosceles triangle arrangements, four freezing pipes in a linear arrangement with equal spacing, and rhombus and rectangle arrangements. A comparison between the analytical solutions and numerical thermal analysis shows that the analytical solutions are sufficiently precise. As a part of the theory of AGF, the analytical solutions of temperature fields for multi-piped freezing with arbitrary layouts and different temperatures of freezing pipes are approached for the first time. 相似文献