Meicníocht Fáis Crack Tuirse agus Straitéis Coiscthe Gearrthóga Earraigh
- Cén áit a dtosaíonn scoilteanna tuirse i gearrthóga leaisteacha de ghnáth?
Stress - concentrated areas of elastic clips are prone to crack initiation, such as the hook of the clip, the support points in contact with the sleeper, and the cross - section mutation areas. Under train loads, the stress concentration coefficient at these parts can reach 2 - 3 times that of normal areas. Statistics show that more than 80% of fatigue cracks in elastic clips start from the inner Taobh an chrúca, atá faoi réir strus agus cuimilte lúbthachta fadtéarmach, agus is dócha go dtarlóidh damáiste micrea -dhromchla, ag éirí mar fhoinse crack .
- Cén chaoi a gcuireann tosca comhshaoil dlús le iomadú scoilteanna tuirse i gclipeanna leaisteacha?
In humid environments, electrochemical corrosion of elastic clips occurs, forming corrosion pits at the crack tips, increasing the stress concentration degree, and accelerating the crack propagation rate by 30% - 50%. In acid - rain areas, the corrosion products on the surface of elastic clips are loose and porous, reducing the material Neart {. Ag an am céanna, téann na meáin chreimneacha isteach sna scoilteanna, ag luasghéarú iomadú crack {. Ina theannta sin, laghdaíonn timpeallachtaí teochta íseal -theochta na n -ábhar gearrthóg elastic . Faoin ualach céanna, rud a fhágann go laghdaíonn an bracture níos mó ná an luach is mó a laghdaíonn an brusture níos mó de réir an bhrath brittle níos mó de réir an bhrath brittle níos mó de réir an bhriste de réir an bhrioscú brittle níos mó de réir an bhrioscála brittle de réir an bhrioscáin ó thaobh na briste de réir an bhriosctha tarlú .
- Cad é an feabhas a chur ar chruach earraigh Bainitic nua ar fheidhmíocht tuirse gearrthóga leaisteacha?
Tá neart den scoth ag cruach earraigh Bhainitic - comhordú diana, le neart teanntachta 1800 - 2000 MPA agus déine tionchair de níos mó ná 60j/cm² . i gcomparáid le cruach earraigh thraidisiúnta, laghdaítear an ráta iomadúcháin bhaireach de bhairr earraigh {}} {}}}}}}}}}}}}}}}}}}}}} Tá gearrthóga elast á laghdú. Tar éis 10^7 timthriall luchtaithe, níl ach fad crack na gclipeanna leaisteacha cruach bainitcha earraigh ach 1/3 de na gearrthóga elastic traidisiúnta {. Sa fheidhmchlár iarbhír ar an iarnród datong - Qinhuangdao, síneofar a shaol seirbhíse go 4 - 5 bliain {{{}} {}} {}} {}} {}}
- Cad é an prionsabal a bhaineann le cóireáil phionóis dromchla chun scoilteanna tuirse a chosc i gclipeanna leaisteacha?
Shot peening treatment uses high - speed shots (diameter 0.3 - 0.8mm) to impact the surface of elastic clips, causing plastic deformation of the surface layer and forming a residual compressive stress layer with a thickness of 0.2 - 0.5mm (stress value - 300 - - 500MPa). The residual compressive stress offsets part of the working tensile stress, delaying crack initiation. At the same time, shot peening refines surface grains, increases surface hardness by 20 - 30HV, reduces surface roughness, and decreases stress concentration. The fatigue life of shot - peened elastic clips can be extended by 1.5 - 2 times.
- Conas scoilteanna tuirse a laghdú i gclipeanna leaisteacha trí leas iomlán a bhaint as struchtúraigh?
Optimizing the geometric shape of elastic clips, using large - radius fillet transitions instead of sharp corners, can reduce the stress concentration coefficient by 30% - 40%. Increasing the elastic deformation area of the legs of elastic clips can disperse the stress distribution and reduce the stress level at key parts. For example, a new type of elastic clip designs the legs in Cruth wavy {. faoin ualach céanna, laghdaítear an strus uasta ag an gcrúca 25%, rud a laghdaíonn an baol go nginfí crack tuirse . go héifeachtach