Study on Time-Correlated Leakage Predication Model of Nonmetallic Gaskets

Huang

2010

AMM

Based on the time-correlated leakage model and fuzzy random probability theory, a formula for calculating fuzzy random reliability of sealing performance of bolted flanged connections was derived. The optimization variables were defined according to the sensitivity analysis of design parameters on fuzzy reliability of sealing performance. A fuzzy reliability optimization design method of flange was investigated, in which both the tightness of bolted flanged connections and the strength of flange were taken into consideration. As an example, an integral welding necked pipe flange was designed according to the optimization design method proposed in this paper. The designed flange not only satisfies the requirements of flange strength and sealing reliability of connections, but also its weight is reduced by 16% compared with that prescribed in the standard.

“…In order to analyze the reliability of sealing performance, the leakage rate of the connections can be calculated based on the presented time-correlated leakage model [4]:…”

Section: Fuzzy Reliability Analysis Of Bolted Flanged Connections The...mentioning

confidence: 99%

“…Loads Analysis. There exists the following relationship between the leakage rate of tested gasket L and the target leakage rate L C according to the reference [4]:…”

Section: Applied Mechanics and Materials Vols 37-38mentioning

confidence: 99%

Fuzzy Reliability Optimization Design Method of Flange Based on the Tightness of Bolted Flanged Connections

Huang

2010

AMM

“…13 Gu et al established the prediction model of the leakage performance of the non-metallic gasket seal by considering material property degradation based on the theory of porous media and analyzed the change rule of the leakage performance with increasing time by the model, and then verified the correctness of the model by the relevant tests. 14 Grine et al proposed the leakage model of porous gasket to predict the leakage performance under high temperature conditions. 15 Siouris et al studied the influence of law of compression stress-relaxation effect on the seal performance of the elastic O-ring by the test method and could realize the prediction of its seal performance.…”

Section: Introductionmentioning

confidence: 99%

Research on micro-leakage performance of the rubber seal

Proceedings of the Institution of Mechanical Engineers, Part C:

Hao

Song³

et al. 2022

For the manned International Space Station, the more stringent requirements of the leakage performance of the rubber seal, which is located in it, is presented. The leakage is caused by the small leakage paths between contact pairs of the rubber seal. Therefore, it is necessary that the micro-leakage performance analysis between interfaces of the rubber seal is carried out. Based on this, the finite element model (FEM) of macroscopic contact performance analysis of the rubber seal is established first, and the macroscopic contact pressure and contact width of the rubber seal are calculated by the model. Then, the micro-leak path model is constructed based on the contact width and surface micro-structure, and the cross-sectional area of the micro-leakage path is obtained, when the contact pressure is acted on the model. Therefore, the fluid flow states in the micro-leakage path are determined, and the flow conductance and the seal leakage rate of rubber seal are all calculated. Finally, the micro-leakage model of the rubber seal is modified to improve the theoretical calculation accuracy by the experiment.

“…Gu et al established the leakage prediction model of non-metallic gasket seal considering material property degradation based on the porous media theory and analyzed the change law of seal leakage performance with increasing time by the model, then verified the correctness of the model by relevant tests. 13 Grine et al established the leakage performance analysis model of porous gasket and predicted the leakage rates of different gases passing through gaskets under high temperature conditions. 14 Li et al established the FEM of local contact based on the fractal theory and gave the prediction model of the static seal leakage performance, then verified the correctness of the theoretical model by the leakage performance test 15 Yu et al 16 analyzed the leakage path calculation method between mechanical seal interfaces based on the penetration theory and realized the calculation and prediction of the leakage path dimensions and leakage rate.…”

Section: Introductionmentioning

confidence: 99%

Macroscopical contact pressure and microscopic leakage performance analysis of rubber seal considering thermal oxygen aging effect

Proceedings of the Institution of Mechanical Engineers, Part G:

Hao

Wang

2022

Leakage performance of rubber seal is a key factor of spacecraft system, which is required long life. But the degradation law of the rubber seal performance in long service period is limited to qualitative analysis for its macro contact performance, and the quantitative research of rubber seal leakage performance is rarely involved considering thermal oxygen aging effect. Therefore, the thermal oxygen aging mathematical model is firstly established to predict the life of rubber material by aging tests. Secondly, the finite element model (FEM) of rubber seal performance analysis considering thermal oxygen aging effect is built to obtain the degradation law of its macroscopic contact performance with the increase of service time. Thirdly, the micro-leakage model of rubber seal considering thermal oxygen aging effect is established based on the material surface microstructure, contact pressure, and contact width, and the leakage rate of rubber seal is calculated by the model. Finally, the micro-leakage model of rubber seal is modified based on the experimental results, so the calculation accuracy of leakage rate is improved.