Kodi 4.8 ndi 8.8 pa Bolts Amatanthauza Chiyani?
Zolemba pa mabawuti, monga 4.8 ndi 8.8, zikuwonetsa momwe ma bolt amagwirira ntchito polumikizana ndi zitsulo. Maphunzirowa agawidwa m'magulu oposa khumi kuphatikizapo 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, ndi 12.9. Pakati pa izi, mabawuti opangidwa ndi 8.8 ndi kupitilira apo amapangidwa kuchokera kuchitsulo chochepa cha carbon alloy kapena sing'anga-carbon zitsulo zomwe zakhala zikuthandizidwa ndi kutentha (kuzimitsa ndi kutentha), zomwe zimatchedwa ma bolts amphamvu kwambiri. Ena onse amadziwika kuti mabawuti okhazikika.
Chidindo cha giredi lakuchita chimakhala ndi magawo awiri a manambala omwe amayimira kufunikira kwamphamvu kwamphamvu komanso kuchuluka kwa zokolola mpaka kumakulidwe kwa bawuti. Mwachitsanzo:
- Bawuti yokhala ndi giredi lakuchita 4.8 imatanthauza:
- Mphamvu yokhazikika ya bawuti imafika 400 MPa;
- Chiŵerengero cha zokolola-to-tensile cha bawuti ndi 0,8;
- Choncho, mwadzina zokolola mphamvu za bawuti zakuthupi ndi 400 × 0,8 = 320 MPa.
- Bawuti yamphamvu kwambiri yokhala ndi giredi la 10.9, pambuyo pa chithandizo cha kutentha, imatha kukwaniritsa:
- Mphamvu zodziwikiratu za bawuti zimafika 1000 MPa;
- Chiŵerengero cha zokolola-to-tensile cha zinthu za bawuti ndi 0,9;
- Choncho, mwadzina zokolola mphamvu za bawuti zakuthupi ndi 1000 × 0,9 = 900 MPa.
Mabawuti amagwirira ntchito ndi muyezo wodziwika padziko lonse lapansi, kuwonetsetsa kuti mabawuti a giredi yofanana amakhala ndi magwiridwe antchito ofanana mosasamala kanthu za zinthu zawo kapena komwe amachokera, zomwe zimalola kuti masankhidwe ake azisankhidwa potengera momwe amagwirira ntchito.
Ponena za kalasi yamphamvu, ziyenera kuzindikirika kuti zomwe zimatchedwa 8.8 ndi 10.9 sizikutanthauza kumeta ubweya wa 8.8 GPa ndi 10.9 GPa, koma m'malo mwake:
- Kwa giredi 8.8, mphamvu yokhazikika ndi 800 N/mm², ndipo mphamvu zokolola mwadzina ndi 640 N/mm².
Mphamvu ya bolt imasonyezedwa ndi "XY", pomwe X100 ikufanana ndi mphamvu ya bawuti, ndipo X100 * (Y / 10) ikufanana ndi mphamvu zokolola za bawuti (monga polemba chizindikiro: kutulutsa mphamvu / mphamvu yolimba = Y/10).
Mwachitsanzo, pa bawuti ya giredi 4.8:
- Mphamvu yamphamvu ingakhale 400 MPa;
- Mphamvu zokolola zitha kukhala 400 * 8/10 = 320 MPa.
Kuphatikiza apo, mabawuti achitsulo chosapanga dzimbiri nthawi zambiri amalembedwa kuti A4-70 kapena A2-70, omwe ali ndi matanthauzo osiyanasiyana malinga ndi miyezo yoyendetsera zomangira zitsulo zosapanga dzimbiri.
Zikomo powerenga, ngati mukufuna kuwona zambiri zomwe timapereka mutha kutsatira maulalo pansipa!