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contributor authorZ. G. Sun
contributor authorB. Q. Gu
date accessioned2017-05-09T00:54:14Z
date available2017-05-09T00:54:14Z
date copyrightFebruary, 2012
date issued2012
identifier issn0094-9930
identifier otherJPVTAS-28556#011211_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/150173
description abstractThe leakage rates of bolted flanged connections change with service time due to the gasket contact stress relaxation and degradation of gasket material. The nonuniform distribution of gasket contact stress has significant influence on the leakage behavior of the connections. In order to predict the time-correlated leakage rates accurately, both appropriate approaches to dealing with the gasket residual contact stress and a corresponding time-correlated leakage model of sealing elements are needed. In this paper, an analytical model has been developed to determine the maximum contact stress at gasket outer diameter in consideration of creeps of flanges, bolts and gasket coupled to the axial deformation compatibility equation. The analysis was verified against the finite element numerical simulation considering the nonlinear behavior of gasket and material creep. The analytical results of the maximum contact stress of gasket and its change over time compared well with those obtained by finite element method. A time-correlated leakage model of nonmetallic gasket sealing connections based on the porous medium theory was established, in which the effects of the gasket material degradation and contact stress relaxation on the sealing performance were taken into consideration. Furthermore, a leakage rate prediction method was proposed. Some long-term sealing performance tests were performed on two types of gaskets to obtain the coefficients in the leakage model. The leakage rate prediction method proposed in this paper was also validated against the experimental data presented by other researchers, and the errors between the predicted values and the experimental results were within 18%.
publisherThe American Society of Mechanical Engineers (ASME)
titlePrediction of Time-Correlated Leakage Rates of Bolted Flanged Connections by Considering the Maximum Gasket Contact Stress
typeJournal Paper
journal volume134
journal issue1
journal titleJournal of Pressure Vessel Technology
identifier doi10.1115/1.4004818
journal fristpage11211
identifier eissn1528-8978
keywordsStress
keywordsGaskets
keywordsFlange connections
keywordsLeakage
keywordsFlanges AND Deformation
treeJournal of Pressure Vessel Technology:;2012:;volume( 134 ):;issue: 001
contenttypeFulltext


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