Research on the Assembly Pattern of MMC Bolted Flange Joint

Zhang, L.Z.; Liu, Y.; Sun, Jiachao; Ma, Kai; Ren-liang, Cai; Guan, Kai

doi:10.1016/j.proeng.2015.12.188

Cited by 16 publications

(10 citation statements)

References 3 publications

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“…Flange strain components are observed from fillet region between flange ring and hub, similar to the strain gauge placement location in experiment. 11 In case of flange response, the deviation is significant compared to ABF, both on assembly and pressurization stage. The variation of longitudinal and tangential flange strains with internal pressure is high in FEA compared to experimental response, following the same trend in both cases.…”

Section: Comparison Of Fea and Experimental Valuesmentioning

confidence: 99%

“…In this joint, bolt preload is shared between gasket and flanges till it reaches a specified limit, beyond which it is taken completely by the metal block provided between flanges. A tightening method is proposed for MMC joint for better sealability by Zhang et al 11 The stability of the soft gasket material is improved in spiral wound gasket, by providing a combination of V-shaped metal ring and soft fillers, wounded radially under radial compression. So, the metal rings and fillers are bonded together due to radial compression.…”

Section: Introductionmentioning

confidence: 99%

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Studies on joint strength and sealing behavior of single and twin-gasketed flange joints

Nelson

Prasad

Sekhar

2017

Proceedings of the Institution of Mechanical Engineers, Part E:

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Leakage is the main mode of failure in gasketed flange joints used in nuclear and thermal power plants. The leakage occurs when the joint is not able to withstand the internal fluid pressure. To evaluate the leakage behavior of gasketed flange joint, it is important to incorporate gasket properties and interfacial contact behavior due to friction. However, for safe joint operation, the members also should be structurally sound without exceeding allowable limit of materials. In this study, the joint strength and sealing behavior of gasketed flange joint are investigated through experiments by carrying out leakage test. The joint strength is evaluated based on strains developed in flanges along longitudinal and tangential direction under both pretightening and pressurizing stages. Three-dimensional finite element simulation is also performed under both aforesaid stages, considering the nonlinear properties of gasket along with hysteresis during unloading. The finite element results of joint strength and leakage pressure are compared with experimental values and observed to be conservative. In addition, the performance of twin gaskets (two gaskets concentric to each other) through both experiment and simulation is also evaluated and compared with that of the single gasket. From the experiment and finite element analysis, it is found that the sealability of twin-gasketed joint is higher than that of single-gasketed joint.

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Section: Comparison Of Fea and Experimental Valuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studies on joint strength and sealing behavior of single and twin-gasketed flange joints

Nelson

Prasad

Sekhar

2017

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Most often, they can occur in two states of loading and deformation. The first one is the assembly state in which the connection may be set up under different assembly patterns [2,32]. Another feature of multi-bolted connections is that they are constructed of many structural components [7,22,27,28].…”

Section: Introductionmentioning

confidence: 99%

“…While the joined elements in such connections are created mainly as a spatial body, the bolts are modelled in different ways. In addition to the spatial models of bolts [1,6,32], the following substitute FE-models of bolts are used:…”

Section: Introductionmentioning

confidence: 99%

Determination of Bolt Forces and Normal Contact Pressure Between Elements in the System with Many Bolts for its Assembly Conditions

Grzejda¹

2019

Adv. Sci. Technol. Res. J.

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The paper put forward a thesis that modelling dissymmetric non-linear multi-bolted connections as a system is possible. Modelling of the systems composed of four subsystems on the assembly state was presented. These subsystems included: a couple of joined elements (a flange and a support), a contact layer between them, and bolts. The physical model of the system was described considering the tightening of bolts according to a specific sequence. In this model: the flange and the support were built using spatial finite elements, the contact layer was formed as the non-linear Winkler model, and the bolts were replaced with simplified models made of flexible beams. The calculation model which can be applied to determine the changes in bolt forces, as well as in the normal contact pressure between the joined elements during the tightening of the system and at its end, was presented. The results of sample calculations for the selected multi-bolted system were shown.

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“…Different mechanisms between the two type joints were illustrated in various studies. 1–5 In an MMC-type flange joint, the graphite seal ring only takes part of the bolt force, while the MMC between the outer metal ring and the flange sealing surfaces takes the additional bolt force to compensate for the unloading effect due to the internal and external loadings. Then, the contact stress on the sealing surface of an MMC-type flange joint stays stable.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the metal-to-metal contact flange joint subject to external bending moment

Zhang

Guangkai

2018

Proceedings of the Institution of Mechanical Engineers, Part E:

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Metal-to-metal contact flange joints are widely used in nuclear and petrochemical industry for severe conditions, because of the relative stability of the sealing gasket stress under complex service condition. In the present work, finite element models were used for analyzing the stress distribution of metal-to-metal contact pipe flange connection under different internal pressures, temperatures, and external bending moments to evaluate the sealing and strength performance. A metal-to-metal contact pipe flange connection device was also experimented. It was found that the results of the axial bolt force and flange hub stress obtained from the experiments were in fairly good agreement with the finite element simulations. The leakage test of metal-to-metal contact type gasket was conducted to highlight its leakage characteristics under different temperatures. The methods to determine the maximum allowable bending moment of a metal-to-metal contact flange joint according the strength criterion and the sealing criterion were analyzed. The results showed that the maximum allowance bending moment was determined by the strength criterion rather than by the sealing criterion with different thermal loadings when the initial bolt-up stress was high enough to achieve metal-to-metal contact contact.

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Research on the Assembly Pattern of MMC Bolted Flange Joint

Cited by 16 publications

References 3 publications

Studies on joint strength and sealing behavior of single and twin-gasketed flange joints

Studies on joint strength and sealing behavior of single and twin-gasketed flange joints

Determination of Bolt Forces and Normal Contact Pressure Between Elements in the System with Many Bolts for its Assembly Conditions

Analysis of the metal-to-metal contact flange joint subject to external bending moment

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