Time-variant structural fuzzy reliability analysis under stochastic loads applied several times

Fang, Yongfeng; Xiong, Jianguo; Tee, Kong Fah

doi:10.12989/sem.2015.55.3.525

Cited by 19 publications

(10 citation statements)

References 14 publications

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“…It is vital to understand the phenomenon of friction and wear [9,10]. The possibility of extension of the operation period, as well as prediction of wear and probability of failure, are significant due to economic and ecological factors [11][12][13][14][15]. The application of the fillers can improve the properties of the sealing element [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Tribological Characteristic of a Ring Seal with Graphite Filler

Szczypiński-Sala

Lubas

2020

Materials

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This paper presents the outcome of the measurement of the tribological characteristic of O-ring seals in the event of operating in conditions with a lack of lubrication. The measurement was carried out on a seal and rod model. The measurement was carried out during the condition of the round cross-section seal sliding on the surface of the piston rod. We analyzed how the friction force during rod movement, which resulted from the cooperation of the sliding nod and the rod, was changing. The experiment was conducted for various rubber materials. The aim of the research was to evaluate the friction reducing capability of graphite in rubbers of commercial sealing parts. Typical materials used for the seal and the materials, which contained the filler in the form of graphite powder, were compared. Synthetic graphite powder with a particle size of 1-2 µm was applied, and nitrile rubber (NBR) and fluoroelastomer (FKM) were compared as typical materials for O-ring seals. In the case of the two tested materials, the addition of graphite powder had an influence on the decrease in the friction force. , depending on the type and structure of the filler, the character of material wear changes [22].Research is conducted with the aim of creating materials with better functional characteristics. A lot of various kinds of fillers are studied. The developed new materials find application in various spheres of the industry. The fillers can have different forms. Although, based on the analysis in the literature, one can infer that, in general, carbon-based materials are widely applied as fillers. The fillers introduced into rubber can significantly improve many properties of the material. Even at a relatively low quantity of the applied filler, the mechanical, thermal, and electrical properties of the elastomeric matrix can be improved. Depending on the choice of the type of filler, properties such as tensile strength, elongation at break, and thermal oxidative stability can be improved. They also enable the change of properties such as the friction coefficient and specific wear rate in the case of materials used as the elements, which need to perform relative movement. Various kinds of rubber such as isobutylene-co-isoprene (IIR), polychloroprene (CR) [23], silicone rubber (SR) [24][25][26][27], ethylene-propylene-diene rubber (EPDM) [28,29], petroleum resin, and nitrile rubber (NBR) [30][31][32] are used as a matrix material. In the literature, one can come across broadly discussed research results on the application of carbon-based materials as filler [33][34][35][36].Scientists are also interested in the methods of material optimization, including reinforcement application. The identification and description of the complex structures obtained in this way is a complicated issue [37,38].The research associated with O-ring seals, described in the literature, refers to their reliability. The mechanical behavior of chosen materials, taking into account both static and dynamic strain [38][39][40], is checked during the tests. The inf...

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Section: Introductionmentioning

confidence: 99%

Tribological Characteristic of a Ring Seal with Graphite Filler

Szczypiński-Sala

Lubas

2020

Materials

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“…Techniques used in risk assessment and analysis in literature are numerous, unique and suitable for different applications. The most common risk analysis are in two categories namely deterministic (quantitative & qualitative) and stochastic (statistics & forecasting), [23], [24]. The stochastic approach used is presented in Table III.…”

Section: Risk-based Inspection and Assessmentmentioning

confidence: 99%

Reliability based maintenance methodology for sustainable transport asset management

Ekpiwhre

Tee

2018

Pollack Periodica

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Functional failures and structural deterioration defects are among the leading causes of growing failure probabilities of the road systems and networks. Thus, asset maintenance intervention is an essential task for the unified management of road assets and systems. The objective of this research is to consider reliability based probabilistic approach established on functional failure mode, effects and criticality analysis parametric reliability analysis, risk-based assessment and strategic asset deterioration decisions. The combined progressive assessment frameworks and algorithms based procedures utilize service inspection, safety inspection and survey inputs. The illustrated reliability maintenance based methodologies offer sustainable asset management for highway transport infrastructure and systems with emphasis on resolutions to their functional failures, defect related risk and appropriate deterioration treatment.

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“…On the basis of the degradation process and material reliability, Woo [12] proposed a life prediction method for the O-ring with the help of the finite element method. Fang et al [13] calculated the reliability of rubber components under random loads on the stress-strength interference model. Furthermore, in the study of load on the O-ring, Zuo et al [14] studied the influence of the working efficiency on the seals of the hydraulic systems.…”

Section: Introductionmentioning

confidence: 99%

Time-Variant Reliability Analysis for Rubber O-Ring Seal Considering Both Material Degradation and Random Load

et al. 2017

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Due to the increase in working hours, the reliability of rubber O-ring seals used in hydraulic systems of transfer machines will change. While traditional methods can only analyze one of the material properties or seal properties, the failure of the O-ring is caused by these two factors together. In this paper, two factors are mainly analyzed: the degradation of material properties and load randomization by processing technology. Firstly, the two factors are defined in terms of material failure and seal failure, before the experimental methods of rubber materials are studied. Following this, the time-variant material properties through experiments and load distribution by monitoring the processing can be obtained. Thirdly, compressive stress and contact stress have been calculated, which was combined with the reliability model to acquire the time-variant reliability for the O-ring. Finally, the life prediction and effect of oil pressure were discussed, then compared with the actual situation. The results show a lifetime of 12 months for the O-ring calculated in this paper, and compared with the replacement records from the maintenance workshop, the result is credible.

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Time-variant structural fuzzy reliability analysis under stochastic loads applied several times

Cited by 19 publications

References 14 publications

Tribological Characteristic of a Ring Seal with Graphite Filler

Tribological Characteristic of a Ring Seal with Graphite Filler

Reliability based maintenance methodology for sustainable transport asset management

Time-Variant Reliability Analysis for Rubber O-Ring Seal Considering Both Material Degradation and Random Load

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