Vim li cas Elastic Modulus yog qhov tseem ceeb Parameter
Lub hauv qab -rail ncoo zaum ntawm txoj kev tsheb ciav hlau thiab tus neeg pw tsaug zog, thiab nws cov qauv elastic txiav txim siab ntau npaum li cas lub log cuam tshuam mus txog rau tus neeg pw tsaug zog, yuav ua li cas lub tsheb ciav hlau deflects nyob rau hauv load, thiab yuav ua li cas vibration propagates rau hauv ib puag ncig. Ib lub ncoo uas tawv dhau kev cuam tshuam thiab suab nrov; ib qho uas mos heev cia cov tsheb ciav hlau deflect ntau dhau, destabilizing gauge thiab geometry. Sib piv cov modulus rau cov kab qeb yog li ntawd lub luag haujlwm tseem ceeb ntawm kev tsim cov ntaub qhwv ntsej, thiab nws ua tiav los ntawm kev tsim, vulcanization thiab qauv.
Peb Levers uas Tswj Modulus
Material formulation yog thawj qib. Hauv ib qho EPDM-raws li kev sib xyaw, ua kom cov pa roj carbon dub thauj khoom los ntawm 30 qhov chaw mus rau 60 qhov chaw ntawm ib puas roj hmab nce lub elastic modulus ntau dua 50 feem pua. Cov txheej txheem vulcanization yog qhov thib ob: kho qhov kub ntawm 150 txog 160 ° C rau 15 mus rau 20 feeb ua kom muaj qhov sib txawv nruab nrab ntawm qhov sib txuas thiab cov qauv ruaj khov, thaum overheating tshaj -crosslinks cov roj hmab mus rau hauv ib qho nyuaj, nkig. Qhov thib peb qib yog geometry: pads nrog grooves los yog puag ncig qhov deform ntau dua nyob rau hauv load thiab khiav 10 mus rau 20 feem pua softer dua cov ntaub ntawv ntawm tib lub compound. ambient kub yog qhov tseem ceeb ntawm sab nraud: lub modulus nce hauv txias thiab poob rau hauv tshav kub, yog li cov formulation yog hloov mus rau hauv lub zos huab cua.
High -Speed Lines: Balance Elasticity thiab Stability
High - cov ntaub qhwv ceev tau teev nyob rau ntawm qhov zoo li qub compressive elastic modulus ntawm 80 txog 120 MPa. Cov hlua no muab cov elasticity txaus los nqus cov kev co ntawm cov tsheb ciav hlau khiav ntawm 250 txog 350 km / h thaum ua kom cov tsheb ciav hlau deflection nyob rau hauv geometry kam rau ua. Lub dynamic-rau- zoo li qub modulus piv yuav tsum nyob nruab nrab ntawm 1.2 thiab 1.5, yog li lub ncoo tsis khov heev nyob rau hauv siab - zaus loading, thiab modulus hloov dua 5 xyoos ntawm UV thiab los nag yuav tsum tsis pub tshaj 10 feem pua. Ib txheej txheej txheej yog ib txwm muaj: ib txheej mos ntawm 80 mus rau 90 MPa nyob rau hauv txoj kev tsheb ciav hlau rau kev vibration absorption thiab ib tug firmer qis txheej ntawm 100 mus rau 120 MPa ntawm lub sleeper rau load faib.
Hnyav -Haul Kab: Sib ntaus Compression Set
Hnyav- cov ntaub qhwv lub taub hau ua haujlwm nyob rau hauv siab txhawb nqa qag loads thiab yuav tsum tiv thaiv compression mus tas li. Ib qho kev sib xyaw ua ke yog styrene-butadiene thiab cov roj hmab ntuj sib xyaw ntawm 7 mus rau 3 piv, nrog 2 feem ntawm cov antioxidant 4010NA thiab 40 feem ntawm silica reinforcement. Ob -theem vulcanization (145 ° C rau 12 feeb, tom qab ntawd 100 ° C rau 4 teev) ua kom qhov sib sib zog nqus sib nqus thiab tuav cov compression teem ntawm lossis qis dua 25 feem pua thaum kuaj ntawm 70 ° C rau 22 teev hauv qab 25 feem pua compression. Cov ntaub qhwv ntsej siv lub ntsej muag hla- ntu, tuab hauv nruab nrab (kwv yees 20 hli) thiab nyias ntawm cov npoo (kwv yees li 15 hli), txhawm rau nthuav dav lub log hnyav hnyav, thiab 2 hli los tiv thaiv- cov kab txaij ntawm lub hauv qab kom lub ncoo tsis txhob nkag mus rau tus neeg pw tsaug zog.
Nroog Rail Transit: Suab nrov -Txoj Kev Tsim Kho
Lub nroog rail pads muab cov qauv qis nrog damping. Lub compound siv damping roj hmab nrog ib tug poob yam tsawg kawg nkaus 0.3, uas converts vibration zog mus rau hauv tshav kub thiab xa 15 mus rau 20 feem pua zoo attenuation tshaj li cov roj hmab zoo tib yam, ntxiv txog 15 feem ntawm vermiculite muab tub lim uas thaiv suab kis tau tus mob. Raws li kev tsim qauv, tus qauv honeycomb (5 hli hlwb ntawm 8 hli qhov sib nrug) ua rau muaj suab nrov sab hauv, thiab 3 hli sib sib zog nqus los ntawm 10 hli dav arc grooves redirect txoj kev vibration deb ntawm lub sleeper. Ib txheej 5 hli polyurethane ua npuas ncauj ntawm lub ncoo thiab kev tsheb nqaj hlau ntxiv rau theem thib ob attenuation; ua ke cov kev ntsuas no txo cov suab nrov ntawm txoj kev tsheb ciav hlau los ntawm 8 mus rau 10 dB.
Kuaj Elastic Modulus
Modulus yog ntsuas los ntawm kev ntsuas compression ntawm GB/T 7757 (compressive stress-strain properties of vulcanised rubber). Cov qauv yog tus qauv 29 hli txoj kab uas hla los ntawm 12.5 hli siab lub tog raj kheej, kuaj ntawm 23 ntxiv lossis rho tawm 2 degrees C ntawm compression ceev ntawm 5 mm / min; peb tus qauv ib batch yog nruab nrab. Txais bands los ntawm kab hom yog teev hauv qab no.
| Hom kab | Static modulus band | Qhov tseem ceeb txais nqi |
|---|---|---|
| Siab -ceev | 80 txog 120 MPa (ntxiv lossis rho tawm 10 MPa) | Dynamic-rau- zoo li qub piv 1.2 txog 1.5 |
| Hnyav-lav | 150 txog 200 MPa | Compression teem tsis ntau tshaj 25 feem pua |
| Nroog tsheb ciav hlau | 60 mus rau 90 MPa | Damping yam tsawg kawg yog 0.3 |
Tsis tas li ntawd, ntsuas qhov ntsuas ntawm qhov ntsuas kub ntawm qhov rho tawm 40 ° C thiab 60 ° C thiab xav tau qhov kev hloov pauv ntawm chav tsev - tus nqi kub kom nyob li ntawm 20 feem pua, lees paub kev ruaj ntseg thoob plaws huab cua.
FAQ
Yuav ua li cas yog lub elastic modulus ntawm ib tug rail ncoo ntsuas?
Los ntawm kev ntsuas compression ntawm GB / T 7757 ntawm 29 hli los ntawm 12.5 hli cov qauv ntawm 23 degrees C, compressing ntawm 5 mm / min thiab faib kev ntxhov siab los ntawm kev sib zog los ntawm kev thauj khoom -deflection nkhaus.
Dab tsi modulus yuav tsum muaj lub siab - ceev rail ncoo muaj?
80 mus rau 120 MPa static modulus, nrog ib tug dynamic - rau - zoo li qub piv ntawm 1.2 mus rau 1.5 thiab tsawg dua 10 feem pua modulus drift tshaj 5 xyoo.
Vim li cas carbon dub loading hloov lub modulus?
Cov pa roj carbon dub txhawb nqa cov roj hmab matrix thiab nce nws cov tawv nqaij; kwv yees li ob npaug ntawm kev thauj khoom los ntawm 30 mus rau 60 qhov chaw ua rau cov khoom siv ntau dua 50 feem pua.
Dab tsi yog compression teeb thiab vim li cas nws txwv?
Cov txheej txheem compression yog lub thickness tas mus li poob tom qab kev txhawb nqa compression. Hauv qhov hnyav - kev pabcuam thauj nws yuav tsum nyob hauv 25 feem pua (70 degrees C, 22 teev, 25 feem pua compression), txwv tsis pub lub ncoo thins, lub fastening slackens thiab taug qab geometry drifts.
Kev txo suab nrov npaum li cas tuaj yeem ua tau zoo -tsim ntaub qhwv lub cev ua tiav?
Hauv kev tsheb ciav hlau hauv nroog, qhov sib xyaw ua ke nrog honeycomb thiab groove qauv ntxiv rau cov txheej txheem ua npuas ncauj txo cov suab nrov li ntawm 8 mus rau 10 dB piv nrog cov ntaub qhwv ntsej muag.