Tsib Kev Laus Mechanisms Tua Rail Pads
Rail pads ua tsis tiav los ntawm kev poob lawv elasticity, thiab txhua qhov chaw ua rau cov yam ntxwv ntawm kev laus: thermo- oxidative aging uas tau tsav los ntawm tshav kub thiab oxygen ntawm cov kab kub yav qab teb; yees duab- oxidative aging tsav los ntawm ultraviolet hluav taws xob nyob rau siab - qhov siab thiab suab puam kab; qis- kub aging los ntawm khov-thaw cycles ntawm alpine kab; ntsev tsuag aging ntawm ntug hiav txwv kab; thiab tshuaj lom neeg- nruab nrab aging nyob rau hauv industrial corridors. Hauv kev xyaum ua ob peb lub tswv yim ua ke: kab suab puam kub, UV- nplua nuj thiab plua plav, thaum kab ntug hiav txwv sib xyaw ntsev, av noo thiab cua sov.
Failure Phenomena los ntawm Aging Type
| Hom kev laus | Ua tsis tiav phenomena |
|---|---|
| Thermo-oxidative | Deg hardening thiab embrittlement, network tawg, nce elastic modulus, poob ntawm buffering |
| Duab -oxidative | Deg chalking, fading, loosening ntawm txheej txheej, ntse poob hauv tensile lub zog |
| Tsawg- kub | Cov iav hloov pauv hloov pauv, poob ntawm elasticity, nkig tawg thaum huab cua txias |
| Ntsev tsuag | Corrosion ntawm hlau reinforcement, delamination, blistering, poob peev xwm load |
| Tshuaj | o, softening los yog tawg nyob ntawm qhov nruab nrab |
Khoom tsim rau Alpine kab
Cov kab Alpine xav kom lub ncoo kom nyob twj ywm ntawm qhov kub ntawm 40 ° C thiab qis dua, yog li lub hom phiaj tsim yog qhov kub hloov pauv iav qis. Txias-cov roj hmab tiv taus xws li polybutadiene-raws li kev sib xyaw, lossis hloov polyurethane, hloov cov roj hmab zoo tib yam; txias-cov yas resistant ua rau kom cov saw hlau hloov tau yooj yim, thiab cov tshuaj tiv thaiv kab mob ntxiv tiv thaiv cov dej sab hauv los ntawm kev khov thiab tawg ntawm lub ncoo. Qhov tshwm sim yog lub ncoo uas ua kom nws elasticity thiab nkag los ntawm kev rov khov dua -thaw cycles es tsis txhob mus nkig.
Kev tsim qauv tsim rau cov kab ntug hiav txwv
Cov tshuaj tsuag ntsev nkag mus rau cov npoo npoo thiab tawm tsam cov hlau nplaum. Cov kev daws teeb meem muaj zog yog tag nrho tsis yog-cov qauv hlau: siab- lub zog fiber ntau hloov cov tsoos steel lossis hlau mesh reinforcement, yog li tsis muaj dab tsi hauv lub ncoo rau corrode. Ib qhov ntom ntom, ntsev-txhaj tshuaj- tiv thaiv txheej yog siv rau saum npoo raws li lub cev thaiv, thiab cov npoo ntawm lub ncoo tau muab khi rau kev nkag mus. Cov qauv no khaws cov load-cov kabmob muaj peev xwm yam tsis muaj delamination thiab blistering pom nyob rau hauv cov hlau-cov ntaub ntawv ntxiv.
Ntawm -Site Aging Assessment
Kev ntsuam xyuas teb ua ke nrog ob qhov kev ntsuam xyuas ceev. Pom pom, nrhiav cov kab nrib pleb, chalking, hardening, blistering los yog delamination, thiab qib qhov hnyav. Tom qab ntawd ntsuas Shore hardness nrog lub portable durometer: kev hloov pauv ntau dua 15 feem pua ntawm cov tshiab -pad tus nqi qhia tias muaj kev laus loj. Thaum kawg ntsuas tus nqi rov qab; thaum nws poob qis dua 80 feem pua ntawm tus nqi tsim, lub ncoo tau poob nws txoj haujlwm buffering thiab yuav tsum tau hloov. Kev siv ob qho tib si zoo li thiab cov txiaj ntsig kev ua tau zoo zam ob qho tib si hauv qab - hloov pauv thiab dhau - hloov.
Kev Ntsuas Cov Qauv thiab Cov Khoom Muag Khoom Specification
Accelerated aging is verified in the laboratory: kub- cua qhov cub aging ib GB/T 3512 (sib npaug rau ISO 188) ntawm qhov ntsuas kub thiab lub sij hawm, tom qab ntawd hardness, tensile thiab rebound checks; qis- qhov kub thiab txias ua haujlwm los ntawm qhov ntsuas qhov tawg; thiab kev tiv thaiv rau ib puag ncig hnyav los ntawm kev nrawm nrawm- qib ntsuas tau piav qhia hauv EN 13146-6. Hauv kev yuav khoom tshwj xeeb, hais txog qhov kev cia siab ntawm qhov kev cia siab tom qab kev laus (piv txwv li tsis pub ntau tshaj 10 feem pua hloov ntau dua 5 xyoos rau cov kab ceev ceev), Cov Dej Hiav Txwv hardness ntau yam, thiab qhov yuav tsum tau rov ua dua. Yuav tsum tau daim ntawv ntsuam xyuas kev laus ua ke nrog cov ntaub ntawv pov thawj.
FAQ
Vim li cas rail pads harden ntawm cov kab kub?
Thaum tshav kub kub thiab oxygen maj mam crosslink thiab oxidise cov roj hmab, tsa lub elastic modulus thiab embrittling saum npoo. Cov nyhuv yog nrawm dua li ntawm 60 degrees C ncoo kub thiab los ntawm cov pa oxygen siab.
Kuv tuaj yeem qhia tau li cas yog tias lub ncoo muaj hnub nyoog ntau dhau ntawm qhov chaw?
Siv cov kev sim ua ke: pom cov kab nrib pleb lossis chalking ntxiv rau Shore hardness hloov siab dua 15 feem pua, lossis tus nqi rov qab qis dua 80 feem pua ntawm cov qauv tsim, txhais tau tias yuav hloov.
Puas yog hlau- cov ntaub thaiv npog tsis haum rau cov kab ntug hiav txwv?
Lawv xav tau tag nrho sealing thiab txheej, thiab txawm tias tom qab ntawd cov txheej hlau corrode dhau sijhawm. Ib qho uas tsis yog-hlau fiber ntau- cov ntaub qhwv lub zog tshem tawm txoj kev xeb tag nrho thiab yog qhov nyiam ntawm ntug hiav txwv tsim.
Dab tsi yog qhov txawv ntawm kev laus thiab compression teeb?
Kev laus yog qhov ntev - lub sij hawm tshuaj degradation ntawm cov roj hmab nws tus kheej, thaum compression teeb yog qhov deformation mus tas li tom qab kev thauj mus los. Ob leeg txo kev ua tau zoo, thiab ob qho tib si raug sim cais; qhia qhov txwv rau txhua qhov.
Daim ntawv pov thawj twg tus neeg muab khoom siv yuav tsum muab?
Cov ntaub ntawv pov thawj, daim ntawv ceeb toom kev laus zuj zus (GB/T 3512 lossis ISO 188), qhov ntsuas qis - qhov ntsuas kub qhov twg xav tau, thiab cov ntawv ceeb toom qhov ntev thiab tawv rau cov khoom siv.