Creep yam ntxwv ntawm Rail Pads thiab Tswj Logic rau Ntev -Lub Sijhawm Teeb Meem ntawm Hnyav-Load Tracks
Yuav ua li cas siab qag load nyob rau hauv hnyav -haul kab ua kom creep deformation nyob rau hauv -rail pads?
Creep tus nqi nce exponentially nrog load; hnyav -haul qag loads (Ntau dua los yog sib npaug rau 30t) yog tshaj 1.3 npaug ntawm cov pa kab (tsawg dua los yog sib npaug rau 23t), drastic elevating ntsug siab ntawm pads. Kev kub siab ua rau irreversible molecular saw plam thiab reorganization nyob rau hauv cov ntaub qhwv, accelerating creep. Tsis tas li ntawd, kev thauj khoom rov qab ua rau muaj kev cuam tshuam thermal, nce qhov kub thiab txias ntxiv thiab txo qis kev tawm tsam. Txhua xyoo creep deformation nyob rau hauv hnyav - cov kab tuaj yeem yog 3-5 npaug ntawm cov kab lus.
Dab tsi cuam tshuam rau lub ncoo creep deformation muaj nyob rau hauv geometric alignment ntawm hnyav -haul lem?
Creep deformation yogtsis yog -uniform-Hloov thaj chaw thiab qhov nkhaus muaj kev nkag siab ntau dua li qhov ncaj. Qhov kev tsis sib haum xeeb no ua raulongitudinal tsis sib haum xeeb(verttical irregularities) nyob rau hauv txoj kev. Cov kev tsis sib haum xeeb ua kom lub log tsis muaj zog- kev tsheb ciav hlau, tsim kom muaj lub voj voog tsis zoo: "ntau dua → ntau dua creep → ntau concentrated loads." Thaum kawg, qhov no ua rau rail corrugation thiab sleeper puas.
Yuav ua li cas los txhim kho lub ncoo creep tsis kam ntawm cov khoom xaiv rau hnyav -cov kab?
Heavy-cov ntaub qhwv qhov tseem ceebhloov polyurethanelos yogultra- siab molecular hnyav polyethylene (UHMWPE)tshaj tej yam ntuj tso roj hmab. Hloov kho polyurethane nrog nano- fillers tsim ib tug interpenetrating network qauv, txo creep deformation rau 1/5 ntawm cov roj hmab ntuj. UHMWPE muaj cov saw hlau molecular siab entanglement, muab kev hnav zoo heev thiab nkag mus rau qhov hnyav heev -cov xwm txheej thauj. Tsis tas li ntawd, sab hauv fiber reinforcement txheej txwv tag nrho cov ntaub qhwv nkag.
Yuav ua li cas "txwv cov thawj coj" hauv kev tsim qauv pab tswj cov ntaub qhwv deformation?
Kev txwv cov thawj coj tau tsa cov qauv ntawm lub ncoo lub qhov rooj sab saud / sab saud, ua kom sib raug zoo nrog cov grooves hauv cov neeg pw tsaug zog thiab cov ntsia hlau. Lawv lub luag haujlwm tseem ceeb yog uatxwv lateral/longitudinal pad creepthiab tiv thaiv slippage nyob rau hauv load. Nyob rau tib lub sijhawm, cov thawj coj hloov ib feem ntsug load rau hauv shear load, dispersing stress concentrations thiab slowing zos creep. Rau cov kab hnyav- cov kab, cov thawj coj feem ntau yog 5 hli -8 hli siab, ua los ntawm cov yas tawv tawv tawv, thiab sib koom ua ke nrog lub ncoo kom muaj zog.
Yuav ua li cas saib xyuas cov ntaub qhwv deformation thaum nyob ntawm -kev tu thiab siv cov phiaj xwm ntsuas?
Cov txheej txheem tseem ceeb yogPeriodic Track kev daws teeb meem ntsuassiv cov qib precision los sau qhov nce hauv qhov hnyav -cov ntu, muab piv nrog cov ntaub ntawv thawj zaug los xam kev sib haum xeeb. Kev txiav txim siab tshaj 10mm qhia tias muaj kev nkag siab ntau dhau. Kev saib xyuas yog ob -tiered: me me creep yog them nrogqhov siab- kho shimskom rov qab smoothness; creep hnyav yuav tsum tau hloov cov ntaub qhwv nrog kev nkag siab zoo dua, thaum tshuaj xyuas cov neeg pw tsaug zog rau kev puas tsuaj los ntawm kev sib haum xeeb kom ntseeg tau cov qauv kev ntseeg.