Ageing of metallic gaskets for spent fuel casks: Century-long life forecast from 25,000-h-long experiments

Sassoulas, H.; Morice, L.; Caplain, P.; Rouaud, Cédric; Mirabel, L.; Beal, F.S.

doi:10.1016/j.nucengdes.2006.02.008

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…The material hardness of the inner lining is much greater than that of the outer lining, and the stress relaxation rate of the former can be ignored compared with that of the latter. 11 The metal O-ring properties are described in Table 1, and the surface profiles and surface roughness of the specimens were measured using the measurement equipment called Phase Shift MicroXAM-3D. Using a testing machine for gasket comprehensive performances, the compression and rebound experiments of the metal O-rings were carried out.…”

Section: Experimental Verificationsmentioning

confidence: 99%

“…Newman et al 10 presented a novel metallic seal design incorporating a spring energizer made from cast single crystal turbine blade alloys, which was experimentally proven to minimize evidently stress relaxation compared with conventional metal seals. Sassoulas et al 11 investigated the stress relaxation of the Helicoflex Õ type of metallic seals, and two methods including a time extrapolation and a time-temperature equivalence parameter were proposed to study the stress relaxation. But the two methods were statistical analysis methods based on the 25,000-h-long experiments of the research objects.…”

Section: Introductionmentioning

confidence: 99%

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Study on characteristics and mathematical models of stress relaxation for metal O-rings

Liao

Fang

Wang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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The metal O-ring is effectively applied to extreme conditions and long-term uses for several decades, where conventional seals cannot meet the requirements. During the long-time service, the stress relaxation of the metal O-ring has been confirmed to be a potential damage to the sealing performance. By analyzing the sealing mechanism and the problem of the stress relaxation of the metal O-ring, a model has been developed to study its stress relaxation. The model includes the contact model, the stress–strain model, and the dynamic equation of stress relaxation. Based on the classical elastic-plastic model for two contact rough surfaces, the contact model of sealing zone is developed, by which the mechanical and geometric parameters of the sealing zone can be obtained for the initial state after the assembling. In the stress–strain model, the determination of stress and strain in the metal O-ring is performed by means of a simplified closed-form solution. The dynamic equation of stress relaxation using the stress-creep rate equation is developed, and is solved by combination of the contact model and the stress–strain model. The equation can be adopted for stress relaxation analysis of the metal O-ring at any time. After a validation of the model by comparison with experiments, a parametric study is presented. Simulation results corresponding with the mathematical models explain how the stress relaxation characteristic of the metal O-ring is influenced by a number of parameters.

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Section: Experimental Verificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on characteristics and mathematical models of stress relaxation for metal O-rings

Liao

Fang

Wang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part J:

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show abstract

“…3 [7]. Therefore, the dynamic equation is obtained and is expressed by The silver is also one of the major materials used by metallic seals, and the main geometric and operating parameters of the studied silver specimen is shown in table 2 [7]. The experimental data and its fitting curve of the studied specimen are shown in Fig.…”

Section: Characteristic Analysis Of Stress Relaxationmentioning

confidence: 99%

Study on Characteristics of Stress Relaxation for Typical Metallic Sealing Materials

Ding¹,

Liao²,

Zhang³

et al. 2016

Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)

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The stress relaxation of the metallic seal is a general problem during its long-term service, which is harmful for the sealing performance. For the metallic seal, the sealing mechanism and the problem of the stress relaxation are analyzed, and the research methods applied to study the problem of stress relaxation of the metallic sealing material are proposed in this paper. Further, the dynamic equation of the metallic seal is developed, and the data processing method and the solving method of the dynamic equation are also put forward, which are based on the stress relaxation experiment. Based on the proposed mathematics methods and the experimental data of the stress relaxation, the analysis about the characteristics of stress relaxation of the two metallic sealing materials are carried out, which include of the aluminum and the silver that are common materials used by the metallic seal. To the specific test conditions, the dynamic equations of stress relaxation are respectively presented, which lay the foundation for judging the sealing performance of the metallic seal during its long-time service.

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“…Based on limited experimental data, a fuzzy model to predict gasket leakage rate and sealing performance was established by Arghavani et al (2002). Sassoulas et al (2016) studied the long-term creep relaxation law of the metal gasket under high temperature, and the relationship among the residual stress, temperature and time was obtained. The relationship between gasket sealing performance and the number of cycles under different pressure fluctuations was analyzed by Păunescu (2006).…”

Section: Introductionmentioning

confidence: 99%

Study on life distribution and prediction method of flexible graphite composite reinforced gasket

Zhang,

Shao,

Kong

et al. 2023

ILT

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Purpose This paper aims to prevent gasket sealing failure in engineering, accurately predict gasket life, extend system life and improve sealing reliability. The accelerated life test method of flexible graphite composite–reinforced gaskets is established, the life distribution law of flexible graphite composite–reinforced gaskets is revealed, and the life prediction method of flexible graphite composite–reinforced gaskets with different allowable leakage rates is proposed, which can provide a reference for the life prediction of other types of gaskets. Design/methodology/approach In this study, flexible graphite composite–reinforced gaskets were tested for long-term high-temperature sealing performance on a multi-sample gasket accelerated life test rig. The data were also analyzed using the least squares method and the K-S hypothesis calibration method. A gasket time-dependent leakage model and an accelerated life model were also developed. Constant stress-accelerated life tests were conducted on flexible graphite composite–reinforced gaskets. On this basis, a gasket life prediction method at different allowable leakage rates was proposed. Findings The life distribution law of flexible graphite composite–reinforced gaskets is revealed. The results show that the life of the gasket obeys the Weibull distribution. The time-correlated leakage model and accelerated life model of the gasket were established. And the accelerated life test method of the flexible graphite composite–reinforced gasket was established. The life distribution parameters, accelerated life model parameters and life estimates of gaskets were obtained through tests. On this basis, a gasket life prediction method under different leakage rates was proposed, which can be used as a reference for other types of gaskets. Practical implications The research in this paper can better provide guidance for the use and replacement of gaskets in the project, which is also very meaningful for predicting the leakage condition of gaskets in the bolted flange connection system and taking corresponding control measures to reduce energy waste and pollution and ensure the safe operation of industrial equipment. Originality/value A multi-specimen gasket-accelerated life test device has been developed, and the design parameters of the device have reached the international advanced level. The life distribution law of the flexible graphite composite–reinforced gasket was revealed. The accelerated life test method for the flexible graphite composite–reinforced gasket was established. The life prediction method of the flexible graphite composite–reinforced gasket under different allowable leakage rates was proposed. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2023-0254/

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Ageing of metallic gaskets for spent fuel casks: Century-long life forecast from 25,000-h-long experiments

Cited by 13 publications

References 2 publications

Study on characteristics and mathematical models of stress relaxation for metal O-rings

Study on characteristics and mathematical models of stress relaxation for metal O-rings

Study on Characteristics of Stress Relaxation for Typical Metallic Sealing Materials

Study on life distribution and prediction method of flexible graphite composite reinforced gasket

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