Haʻilula helu ukana kaulahao

ʻO ke ʻano helu ʻana o ke kaulahao e hāpai ana i ke kaumaha penei: ʻO ke ʻano helu ʻana o ke kaumaha mika kaulahao hāpai? Pane: ʻO ke ʻano kumu ka helu o nā ʻāpana = ka lōʻihi holoʻokoʻa (mm) ÷ 14. 8 mm = 600 ÷ 14. 8 = 40. 5 (nā ʻāpana) Kaumaha o kēlā me kēia ʻāpana = He aha ke ʻano helu no ka ikaika tensile o ke kaulahao kila poepoe? Ikaika haki kaulahao Ka helu ʻana o ka ikaika haki o ke kaulahao wili pā 1. ʻO ke kaumaha haki liʻiliʻi loa o ke kila 40Cr ʻo S=980N/mm2, ʻo ka ʻāpana ʻāpana liʻiliʻi loa o kahi loulou kaulahao hoʻokahi ma nā ʻāpana B (mm2), a ʻo ka ikaika haki liʻiliʻi loa o ke kaulahao ma nā ʻāpana F (N). ʻO ke ʻano F=S×B3. Ka helu ʻana o ke kaulahao me ka mānoanoa 10 a me ka pitch 80: B=15*10*2+12. 5*10*2=550mm2F=980*550=539000N Ka helu ʻana o ke kaulahao me ka mānoanoa 16 a me ke kiʻekiʻe 80: B=15*16*2+12 .5*16*2=880mm2F=980*880=862400N Ka helu ʻana o ke kaulahao me ka mānoanoa 16 a me ke kiʻekiʻe 120: B=23. 5*16*2+22. 5*16*2=1472mm2F=980*1472=1442560N