Fatigue Limit Design ntawm Elastic Clips kom haum rau kab khiav ceev
Cov kab khiav hauj lwm ceev cuam tshuam li cas rau lub xeev qaug zog ntawm elastic clips?
Kev khiav hauj lwm ceev txiav txim qhov zaus thiab dynamic amplitude ntawm alternating loads ntawm clips. Tsawg- cov kab ceev muaj cov tsheb ciav hlau tsawg zaus; clips feem ntau dais zoo li qub loads thiab qis - zaus, me me - amplitude vibrations nrog maj mam hloov kev ntxhov siab. Nruab nrab- cov kab nrawm muaj qhov ua kom muaj kev vibration ntau zaus, tso cov clips hauv nruab nrab-ntau zaus qaug zog ntau. High-cov kab nrawm dhau lub log-rail cuam tshuam ntau zaus txog li ob peb puas hertz; clips ua siab ntev - zaus, siab - amplitude alternating stress ua ke nrog rau cov kev cuam tshuam ib ntus. Kev nrawm dua ua kom muaj kev ntxhov siab ntau ntxiv, ua rau muaj kev pheej hmoo ua rau qaug zog.
Lub hauv paus ntsiab lus tseem ceeb ntawm clip qaug zog txwv tsim yog dab tsi, thiab yuav ua li cas kom tau txais kev hloov pauv ceev?
Lub hauv paus ntsiab lus tseem ceeb yog "kev ntxhov siab amplitude hauv qab qhov qaug zog txwv nrog kev nyab xeeb txaus." Rau qis- cov kab nrawm, cov hlau manganese zoo tib yam nrog cov ntoo khaub lig qis -sectional zog txaus, ua tau raws li qhov yuav tsum tau ua rau qaug zog. Nruab nrab- cov kab ceev yuav tsum tau kho kom zoo hla- ntu thiab nruab nrab- carbon steel quenching, tsa qhov kev qaug zog siab tshaj 300MPa. High- cov kab ceev ceev tswj cov hlau hlau, nrog cov qauv kev ntxhov siab ua kom zoo los txhawb qhov qaug zog tshaj 450MPa. Nyob rau tib lub sijhawm, qhov clip lub ntuj zaus yog tswj kom tsis txhob muaj kev cuam tshuam nrog lub log -rail vibrations.
Yuav ua li cas tshwm sim thaum ib tug clip lub ntuj zaus resonates nrog kab vibration zaus?
Resonance tshwm sim thaum clip lub ntuj zaus sib tw lub log-rail vibration zaus, ua kom nrov nrov kev vibration amplitude thiab ua rau cov clip rau kev ntxhov siab ntau tshaj qhov tsim nqi. Resonance ua kom luv lub neej qaug zog ntau dua 90%-ib daim clip tsim rau 10 xyoo kev pabcuam tuaj yeem tawg hauv lub hlis. Fractured clips plam clamping quab yuam, ua rau rail loosening thiab gauge widening, ua rau muaj kev phom sij loj heev -kev nyab xeeb kev khiav hauj lwm ceev. Yog li ntawd, zam resonance yog ib qho tseem ceeb txwv nyob rau hauv siab -speed clip tsim.
Dab tsi yog qhov txawv ntawm kev qaug zog txwv ntawm Suav thiab thoob ntiaj teb tus qauv siab -ceev clips?
Tuam Tshoj tus "High-Speed Railway Fastener System Clips" tus qauv yuav tsum muaj siab - ceev clips kom tiv taus 10^7 kev ntxhov siab cycles yam tsis muaj pob txha nyob rau hauv siab tshaj plaws ua hauj lwm. Cov txheej txheem thoob ntiaj teb xws li UIC 864 yuam kom nruj dua: tsis tsuas yog 10^7 lub voj voog tsis muaj kev puas tsuaj tab sis kuj muaj qhov seem deformation tsawg dua lossis sib npaug li 0.1 hli thiab tsis pom qhov tawg tom qab 10^8 cycles. Qee cov qauv thoob ntiaj teb ntxiv qhov qis- ntsuas qhov kub thiab txias, yuav tsum muaj kev qaug zog ntawm -40℃kom tsis pub tsawg dua 90% ntawm chav tsev-tus nqi kub, hloov mus rau alpine high-speed kab.
Yuav ntsuas li cas rau ntawm -qhov chaw seb qhov clip qaug zog txwv tsis sib haum nrog cov kab nrawm uas siv cov ntaub ntawv ua haujlwm?
Kev txheeb xyuas ntawm cov qhab nia ntawm qhov sib tsoo ntawm qhov chaw nrawm: qhov kev nce ntxiv hauv cov pob txha tawg tom qab kev hloov kho nrawm qhia tias cov clips qub tsis sib haum nrog qhov nrawm tshiab. Meanwhile, strain gauges saib xyuas kev ua haujlwm kev ntxhov siab; yog tias qhov ntsuas qhov siab tshaj plaws siab tshaj 80% ntawm qhov tsim kev qaug zog txwv, tam sim ntawd hloov nrog qib siab dua - qib clips. Tsis tas li ntawd, tsis tu ncua coj mus kuaj hauv - cov kev pabcuam clips los tshuaj xyuas qhov seem deformation thiab microcracks saum npoo - cov seem deformation ntau dhau kuj qhia tias kev ua haujlwm qaug zog tsis txaus, yuav tsum tau kho dua tshiab.