Fatigue Life Enhancement thiab Full -Cycle Life Prediction Technology rau Elastic Clips
Dab tsi yog cov txheej txheem tseem ceeb thiab cov yam ntxwv tsis ua haujlwm ntawm elastic strip fatigue tsis ua haujlwm?
Lub ntsiab mechanism ntawm elastic strip qaug zog tsis ua hauj lwm yog qhov pib thiab nthuav tawm ntawm qaug zog tawg nyob rau hauv alternating kev ntxhov siab. Elastic strips tau rov ua dua elastic deformation nyob rau hauv lub tsheb ciav hlau loads, tsim alternating tensile thiab compressive stresses ntawm txheej txheej. Thaum tus naj npawb ntawm kev ntxhov siab ntau dhau ntawm cov khoom siv qaug zog, cov kab nrib pleb pib pib. Cov kab nrib pleb feem ntau tshwm sim ntawm qhov kev ntxhov siab xws li lub hauv paus ntawm elastic strip claws thiab arc hloov chaw, qhov twg tus nqi kev ntxhov siab tuaj yeem ncav cuag ntau dua 80% ntawm cov khoom muaj zog. Cov txheej txheem tawg yog qhov tshwm sim los ntawm cov kab nrib pleb zoo ntawm cov kab nrib pleb, nthuav tawm ntawm ob peb millimeters mus rau ntau tshaj kaum millimeters. Nyob rau lub sijhawm no, cov hlua elastic tseem tuaj yeem tswj tau qhov yooj yim buckling quab yuam, tab sis muaj peev xwm muaj kev nyab xeeb. Qhov kawg tsis ua hauj lwm theem yog qhov tawg nkag mus rau hauv elastic strip seem, uas ua rau brittle puas. Cov pob txha pob txha qhia pom cov yam ntxwv qaug zog striation, thiab tsis muaj qhov pom tseeb ntawm cov yas deformation thaum lub sij hawm tawg. Cov yam ntxwv tsis ua hauj lwm kuj muaj xws li qhov tsis xws luag xws li xeb pits thiab cov cuab yeej ua cov cim ntawm elastic strip nto. Cov kev tsis xws luag no yuav ua kom qhov pib ntawm qaug zog tawg thiab ua kom lub neej qaug zog ntawm elastic strips los ntawm 30% -50%.
Dab tsi yog cov txheej txheem kev txhim kho cov khoom siv thiab kev txhim kho kev ua tau zoo ntawm kev qaug zog lub neej ntxiv dag zog rau kev siab - ceev railway elastic strips?
High -Speed railway elastic strips txais yuav 60Si2CrVATi alloy steel es tsis txhob siv cov tsoos 60Si2CrVA steel. Los ntawm kev ntxiv cov ntsiab lus titanium los ua kom zoo dua cov nplej, cov nplej loj yog txo los ntawm 10μm mus rau 5μm, thiab kev qaug zog ntawm cov khoom yog nce los ntawm 20%. Cov khoom siv no muaj lub zog tensile Ntau dua lossis sib npaug ntawm 1450MPa, lub zog tawm los Ntau dua lossis sib npaug rau 1300MPa, thiab elongation Ntau dua lossis sib npaug li 12%. Nws cov khoom siv kho tshuab dav dav yog qhov zoo tshaj plaws rau cov khoom siv ib txwm muaj, thiab nws tuaj yeem tiv taus siab - zaus hloov kev ntxhov siab ntawm qhov ceev ntawm 350 km / h. Kev kho cua sov txheej txheem ntawm elastic strips yog optimized rau quenching + nruab nrab -kub tempering, nrog rau tempering kub tswj ntawm 420 degree, kom cov elastic strips tau ib tug zoo heev ua ke ntawm lub zog thiab toughness, nrog rau ib tug tej yam toughness ntau dua los yog sib npaug zos rau 60J / cm², tsis txhob qis - kub. Lub neej qaug zog ntawm elastic strips tom qab cov khoom siv optimization tuaj yeem ncav cuag ntau dua 8 lab lub sijhawm, ob zaug ntawm cov khoom siv elastic, ua kom tau raws li 20- xyoo kev pabcuam kev xav tau ntawm high{28}} cov kab tsheb ciav hlau ceev. Kev ntsuas kev ua tau zoo qhia tau hais tias qhov ua kom zoo dua elastic strips tsis muaj qhov pib tawg tom qab 8 lab cyclic loads nyob rau hauv simulated high-speed railway kev co, thiab lub zog qaug zog yog qhov tseem ceeb.
Dab tsi yog cov kev ntsuas tseem ceeb rau kev txhim kho cov qauv ntawm elastic strips kom tshem tawm kev ntxhov siab?
Lub hauv paus ntawm elastic strip structural txhim kho yog tshem tawm cov kev ntxhov siab concentration qhov chaw. Ua ntej, cov hauv paus hniav ntawm elastic strip claw yog kho nrog kev hloov ntawm fillet, thiab lub vojvoog fillet yog nce los ntawm R2mm mus rau R5mm, qhov kev ntxhov siab concentration yog txo los ntawm 1.8 mus rau 1.2, zoo heev txo qhov tshwm sim ntawm tawg pib. Qhov thib ob, qhov kev hloov pauv ntawm arc ntawm lub elastic strip yog optimized, siv ib tug du nkhaus es tsis txhob ntawm cov tsoos polyline hloov, ua rau cov kev ntxhov siab faib ntau yam thiab txo tus nqi siab tshaj plaws ntawm 15%. Thib peb, tus ntoo khaub lig- ntu ntawm txoj hlua elastic siv qhov sib txawv ntawm tus ntoo khaub lig- ntu qauv tsim, qhov kev ntxhov siab- cov kabmob ntawm cov claw yog thickened mus rau 12 hli, thiab cov tsis yog - kev nyuaj siab-cov kabmob yog thinned mus rau 8 hli, txo qhov kev ntxhov siab ntawm qhov tsis yog 6} {15} kev ntxhov siab buckling zog. Fourthly, qhov kawg ntawm cov elastic strips siv lub tiaj tus tsim, qhov dav yog nce los ntawm 20mm mus rau 25mm, ua rau thaj chaw sib cuag nrog cov tsheb ciav hlau thiab dispersing kev ntxhov siab. Tom qab kev txhim kho cov txheej txheem, nws yuav tsum raug txheeb xyuas los ntawm kev txheeb xyuas qhov kev ntxhov siab kom ntseeg tau tias qhov kev ntxhov siab ntawm txhua feem ntawm cov hlua elastic yog qis dua qhov qaug zog ntawm cov khoom siv, thiab qhov kev ntxhov siab hloov pauv tau tswj nyob rau hauv ± 5%.
Dab tsi yog cov txheej txheem txheej txheem thiab cov ntsiab cai ntawm kev txhim kho saum npoo ntawm elastic strips los txhim kho lub neej qaug zog?
Kev kho qhov chaw ntxiv dag zog ntawm elastic strips txais cov txheej txheem sib xyaw ntawm kev txhaj tshuaj peening ntxiv dag zog + qis -kub phosphating. Txhaj peening ntxiv dag zog siv stainless hlau txhaj tshuaj nrog ib txoj kab uas hla ntawm 0.3mm los tsuag cov elastic strip nto ntawm ib tug siab ntawm 0.5MPa, uas ua rau ib tug 0.2-0.3mm yas deformation txheej nyob rau saum npoo thiab tsim residual compressive kev nyuaj siab. Residual compressive stress tuaj yeem cuam tshuam qhov tensile stress Cheebtsam nyob rau hauv alternating stress, txo qhov tseeb alternating kev nyuaj siab amplitude ntawm elastic strip nto los ntawm 30%, thiab zoo heev ncua qhov pib ntawm qaug zog tawg. Cov txheej txheem phosphating uas tsis kub yog 5-10μm phosphating zaj duab xis ntawm elastic strip nto. Cov phosphating zaj duab xis muaj lubricity zoo heev thiab corrosion kuj, uas tuaj yeem txo qhov kev sib txhuam thiab hnav ntawm elastic strip thiab rail, thiab tsis txhob muaj kev ntxhov siab vim los ntawm khawb qhov chaw. Qhov saum npoo roughness ntawm elastic strip tom qab txhaj tshuaj peening ntxiv dag zog yog Ra tsawg dua los yog sib npaug rau 1.6μm, tshem tawm cov teeb meem xws li cov cuab yeej ua cov cim thiab burrs, thiab ntxiv txo qhov kev pheej hmoo ntawm kev ntxhov siab. Lub neej qaug zog ntawm elastic strips kho los ntawm cov txheej txheem sib xyaw yog nce los ntawm 40% piv nrog cov tsis tau kho, thiab cov ntsev tsuag kuj muaj ntau dua lossis sib npaug li 500 teev, haum rau ntau qhov chaw hnyav.
Txoj kev tsim kho thiab daim ntawv thov ceeb toom ntxov ntawm tag nrho - qauv kev kwv yees lub neej ntawm elastic strips yog dab tsi?
Kev tsim kho ntawm tag nrho - lub voj voog kev kwv yees lub neej qauv ntawm elastic strips yog ua raws li Miner fatigue cumulative puas tsuaj txoj kev xav. Ua ntej, cov ntsuas kev ntxhov siab yog siv los ua tiag- lub sijhawm saib xyuas qhov hloov pauv kev ntxhov siab thiab lub voj voog ntawm cov hlua elastic thaum lub sijhawm ua haujlwm kom tau txais cov ntaub ntawv kev ntxhov siab. Qhov thib ob, kev sim qaug zog ntawm elastic strips yog ua nyob rau hauv lub chaw soj nstuam los txiav txim siab lub neej qaug zog nyob rau hauv txawv kev ntxhov siab amplitudes thiab kos tus S-N nkhaus (kev nyuaj siab- lub neej nkhaus). Tom qab ntawd, muab cov ntaub ntawv ntawm -qhov chaw saib xyuas kev ntxhov siab nrog S-N nkhaus los xam qhov qaug zog ntawm qhov kev puas tsuaj ntawm cov hlua elastic. Thaum qhov kev puas tsuaj nce mus txog 0.8, nws tau txiav txim siab tias qhov qaug zog tsis ua haujlwm thaum ntxov. Thaum kawg, ib qho IoT-raws li kev kwv yees lub neej yog tsim los upload cov ntaub ntawv kev ntxhov siab thiab kev puas tsuaj ntawm elastic strips nyob rau lub sijhawm tiag tiag kom paub txog kev twv ua ntej ntawm tag nrho - lub neej voj voog. Daim ntawv thov ceeb toom ntxov yog tias thaum lub kaw lus txiav txim siab tias qhov kev puas tsuaj ntawm cov hlua elastic yog ze rau qhov pib, nws tau teeb tsa kev saib xyuas ntxov kom ceeb toom cov neeg ua haujlwm thiab cov neeg ua haujlwm saib xyuas kom hloov cov hlua elastic nyob rau lub sijhawm kom tsis txhob muaj kev qaug zog tawg. Qhov kev twv ua ntej lub neej yuam kev ntawm tus qauv yog Tsawg dua lossis sib npaug li 10%, uas tuaj yeem ua tau zoo coj kev tiv thaiv kev saib xyuas ntawm txoj kab nrawm.