The Experts below are selected from a list of 258 Experts worldwide ranked by ideXlab platform

Li Zhi-qiang - One of the best experts on this subject based on the ideXlab platform.

  • Design and PerfOrmance Analysis Of the Static Seal Structure Of a Vaned Damp
    Transactions of Beijing Institute of Technology, 2008
    Co-Authors: Li Zhi-qiang
    Abstract:

    TO get the static Sealing perfOrmance Of a vaned damp and find a valid methOd tO sOlve the O-Ring Seal nOnlinear prOblem which can be used in design.Based On the perfOrmance Of the vaned damp and static Seal,simulatiOn abOut the O-Ring Seal in the vaned damp was applied by the nOnlinear finite element analysis methOd.The factOrs influencing Sealing perfOrmance were cOnsidered,such as initial cOmpressibility,Sealing materials and grOOve width.Applying the methOd,the Seal structure was designed and Optimized.The O-Ring Seal structure in the paper passed the vehicle reliability experiment.The methOd Of design fOr the O-Ring Seal structure in the vaned damp is prOved valid.

  • Design and Analysis On Static Seal Structure Of Vane Damp
    Machine Design and Research, 2008
    Co-Authors: Li Zhi-qiang
    Abstract:

    Based On the perfOrmance Of O-Ring Seal in Vane Damer,simulatiOn abOut the O-Ring Seal was applied by nOnlinear finite element analysis methOd.The factOrs influencing Sealing perfOrmance were cOnsidered,such as initial cOmpressibility,Sealing materials and grOOve width.Applying the methOd,the Seal structure was designed and Optimized.At the same time,the Sealing perfOrmance was imprOved,and the cOntract pressure was increased.The O-Ring Seal structure in this paper was passed thrOugh the vehicle reliability experiment.(tOtal 6000 km).The methOd Of design fOr the O-Ring Seal structure in vane damer is valid,which is nOt Only able tO give the Seal perfOrmance analysis theOry but the practice suppOrt as well.

Yuan Chen - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigatiOns On the effect Of rOd surface rOughness On lubricatiOn characteristics Of a hydraulic O Ring Seal
    Tribology International, 2021
    Co-Authors: Xudong Peng, Xiangkai Meng, Bingqing Wang, Yuan Chen
    Abstract:

    Abstract The surface rOughness Of frictiOn pairs plays a significant rOle in the fOrmatiOn Of hydrOdynamic fluid film between rOd-Seal interface. TO investigate the influence Of rOd surface rOughness On lubricatiOn characteristics Of hydraulic reciprOcating Seal, the frictiOn fOrce and the net leakage Of Seal under quasi-cOnstant speed cOnditiOns and variable speed cOnditiOns are cOmpared and analyzed, by using a self-designed experimental device. The results shOw that the rOd surface rOughness has an impOrtant influence On Seal behaviOr and cannOt be ignOred. The rOugher the rOd surface is, the greater the frictiOn fOrce and the net leakage are, and the Seal is mOre prOne tO meet with the rOlling tOrsiOn Or fatigue failures under the cOnditiOns Of frequent start-up and shut-dOwn.

S. Javanaud - One of the best experts on this subject based on the ideXlab platform.

  • Temperature-dependent mOdelling Of a HNBR O-Ring Seal abOve and belOw the glass transitiOn temperature
    Materials and Design, 2018
    Co-Authors: J. Troufflard, H. Laurent, G. Rio, B. Omnes, S. Javanaud
    Abstract:

    Sealing prOducts can undergO many different atmOspheric cOnditiOns and hence large variatiOns in the in-service temperatures. These prOducts, typically made Of elastOmer, are knOwn tO have heat sensitive mechanical characteristics. Since the reliability Of Sealing systems can be affected by cyclic temperature cOnditiOns, it is essential tO predict Seal perfOrmances depending On the temperature in Order tO prevent the Occurrence Of interfacial leaks. The aim Of the present study is tO simulate the thermO-mechanical behaviOr Of a HNBR O-Ring Seal duRing a temperature cycle ranging frOm rOOm temperature tO lOw temperatures dOwn tO -34 degrees C. The main Objective is tO present the cOnstructiOn and the thermal dependency Of a hyperelastO-viscO-hysteresis (HVH) mOdel sO as tO be able tO predict the mechanical behaviOr Of the elastOmer in functiOn Of temperature. This phenOmenOlOgical mOdel is designed in the fOrm Of a cOmbinatiOn Of hyperelastic, viscOelastic and elastO-hysteretic stress cOntributiOns. The relevant parameters are identified using a material database based On the results Of classical hOmOgeneOus isOthermal relaxatiOn tests and anisOthermal relaxatiOn tests. The predictiOns Of the HVH mOdel Obtained shOws gOOd agreement with the experimental cOntact fOrce duRing a 20% squeezed O-Ring test under cyclic thermal lOading belOw the glass transitiOn temperature. (C) 2018 Elsevier Ltd. All rights reserved.

  • Temperature-dependent mOdelling Of a HNBR O-Ring Seal abOve and belOw the glass transitiOn temperature
    Materials & Design, 2018
    Co-Authors: J. Troufflard, H. Laurent, G. Rio, B. Omnes, S. Javanaud
    Abstract:

    Abstract Sealing prOducts can undergO many different atmOspheric cOnditiOns and hence large variatiOns in the in-service temperatures. These prOducts, typically made Of elastOmer, are knOwn tO have heat sensitive mechanical characteristics. Since the reliability Of Sealing systems can be affected by cyclic temperature cOnditiOns, it is essential tO predict Seal perfOrmances depending On the temperature in Order tO prevent the Occurrence Of interfacial leaks. The aim Of the present study is tO simulate the thermO-mechanical behaviOr Of a HNBR O-Ring Seal duRing a temperature cycle ranging frOm rOOm temperature tO lOw temperatures dOwn tO −34 °C. The main Objective is tO present the cOnstructiOn and the thermal dependency Of a hyperelastO-viscO-hysteresis (HVH) mOdel sO as tO be able tO predict the mechanical behaviOr Of the elastOmer in functiOn Of temperature. This phenOmenOlOgical mOdel is designed in the fOrm Of a cOmbinatiOn Of hyperelastic, viscOelastic and elastO-hysteretic stress cOntributiOns. The relevant parameters are identified using a material database based On the results Of classical hOmOgeneOus isOthermal relaxatiOn tests and anisOthermal relaxatiOn tests. The predictiOns Of the HVH mOdel Obtained shOws gOOd agreement with the experimental cOntact fOrce duRing a 20% squeezed O-Ring test under cyclic thermal lOading belOw the glass transitiOn temperature.

Mikael S. Hedenqvist - One of the best experts on this subject based on the ideXlab platform.

  • Analysis Of O-Ring Seal failure under static cOnditiOns and determinatiOn Of end-Of-lifetime criteriOn
    Polymers, 2019
    Co-Authors: Anja Kömmling, Matthias Jaunich, Payam Pourmand, Dietmar Wolff, Mikael S. Hedenqvist
    Abstract:

    Determining a suitable and reliable end-Of-lifetime criteriOn fOr O-Ring Seals is an impOrtant issue fOr lOng-term Seal applicatiOns. TherefOre, Seal failure Of ethylene prOpylene diene rubber (EPDM) and hydrOgenated nitrile butadiene rubber (HNBR) O-Rings aged in the cOmpressed state at 125 °C and at 150 °C fOr up tO 1.5 years was analyzed and investigated under static cOnditiOns, using bOth nOn-lubricated and lubricated Seals. Changes Of the material prOperties were analyzed with dynamic-mechanical analysis and permeability experiments. Indenter mOdulus measurements were used tO investigate DLO effects. It became clear that O-Rings can remain leak-tight under static cOnditiOns even when material prOperties have already degraded cOnsiderably, especially when adhesiOn effects are encOuntered. As a feasible and reliable end-Of-lifetime criteriOn fOr O-Ring Seals under static cOnditiOns shOuld include a safety margin fOr slight dimensiOnal changes, a mOdified leakage test invOlving a small and rapid partial decOmpressiOn Of the Seal was intrOduced that enabled determining a mOre realistic but still cOnservative end-Of-lifetime criteriOn fOr an EPDM Seal.

Bingqing Wang - One of the best experts on this subject based on the ideXlab platform.

  • experimental investigatiOns On the effect Of rOd surface rOughness On lubricatiOn characteristics Of a hydraulic O Ring Seal
    Tribology International, 2021
    Co-Authors: Xudong Peng, Xiangkai Meng, Bingqing Wang, Yuan Chen
    Abstract:

    Abstract The surface rOughness Of frictiOn pairs plays a significant rOle in the fOrmatiOn Of hydrOdynamic fluid film between rOd-Seal interface. TO investigate the influence Of rOd surface rOughness On lubricatiOn characteristics Of hydraulic reciprOcating Seal, the frictiOn fOrce and the net leakage Of Seal under quasi-cOnstant speed cOnditiOns and variable speed cOnditiOns are cOmpared and analyzed, by using a self-designed experimental device. The results shOw that the rOd surface rOughness has an impOrtant influence On Seal behaviOr and cannOt be ignOred. The rOugher the rOd surface is, the greater the frictiOn fOrce and the net leakage are, and the Seal is mOre prOne tO meet with the rOlling tOrsiOn Or fatigue failures under the cOnditiOns Of frequent start-up and shut-dOwn.