Lub 90 degree ob lub qhov (socket) khoov yog khoov nrog cov khoom tiav ntawm cov khoom siv khoov, uas tau muab faib ua ob txoj haujlwm: txias simmer thiab kub thawb. Tsis muaj teeb meem dab tsi ntawm cov tshuab, khoom siv thiab cov kav dej, feem ntau ntawm lawv siv 90 degree ob lub qhov (socket) khoov, uas yog siv rau cov roj, roj, infusion, engineering choj, thiab lwm yam.
Lub deformation degree ntawm cov yeeb nkab nyob ntawm qhov txheeb ze dabtsi yog khoov vojvoog R / D thiab tus txheeb ze thickness t / D qhov tseem ceeb. Qhov me me ntawm R / D thiab t / D qhov tseem ceeb, qhov ntau dua qhov deformation degree. Rau txoj kev zoo ntawm cov yeeb nkab fittings, lub degree ntawm deformation yuav tsum tau tswj nyob rau hauv qhov kev tso cai. Txoj kev khoov ntawm cov yeeb nkab fittings nyob ntawm tsis yog tsuas yog cov khoom siv ntawm cov khoom siv thiab kev khoov, tab sis kuj yog nyob ntawm kev siv cov yeeb nkab fittings. Kev tsim cov yeeb nkab fittings yuav tsum muaj cov ntsiab lus hauv qab no:
(1) Lub elongation deformation nyob rau hauv lub tensile deformation cheeb tsam sab nraum lub nruab nrab txheej tsis pub tshaj tus nqi yas tso cai ntawm cov khoom, ua rau tawg;
(2) Nyob rau hauv lub compression deformation cheeb tsam ntawm sab hauv ntawm lub nruab nrab txheej, lub nyias-walled qauv nyob rau hauv qhov kev txiav txim ntawm tangential compressive kev nyuaj siab yuav tsis wrinkle tshaj instability;
(3) Yog hais tias cov yeeb nkab haum muaj qhov yuav tsum tau ntawm ovality, tswj qhov distortion ntawm nws seem;
(4) Yog tias cov yeeb nkab fittings muaj qhov yuav tsum tau muaj zog los tiv thaiv sab hauv, kev tsim cov phab ntsa tuab yuav tsum tau tswj.
