Thaum lub sijhawm tsim khoom, thaum cov yas yaj raug txhaj rau hauv qhov pwm qhov hauv qab qhov kub thiab siab thiab pwm hauv qab siab, thaum qhov kub poob qis, cov yas yaj txias thiab khov ua ib feem yas. Qhov loj ntawm qhov yas me dua li qhov ntawm qhov pwm qhov, uas hu ua luv. Cov laj thawj tseem ceeb rau kev luv yog raws li nram no. Thaum ua yas, qhov ntev ntawm cov rooj vag pwm sib txawv yog txawv. Lub rooj vag loj pab ua kom lub siab ntawm qhov pwm nce ntxiv, ua kom lub sijhawm kaw ntawm lub rooj vag ntev dua, thiab pab kom cov yaj ntws mus rau hauv qhov pwm ntau dua, yog li qhov ceev ntawm qhov yas kuj tseem loj dua, yog li txo qhov luv, txwv tsis pub nws yuav ua rau qhov luv dua.
Kev hloov pauv ntawm cov qauv tshuaj lom neeg ntawm cov pwm yas thaum lub sijhawm tsim khoom. Qee cov yas hloov lawv cov qauv tshuaj lom neeg thaum lub sijhawm molding. Piv txwv li, hauv cov yas thermosetting, cov roj hmab hloov pauv ntawm cov qauv linear mus rau cov qauv zoo li lub cev. Qhov hnyav ntawm cov qauv zoo li lub cev loj dua li ntawm cov qauv linear, yog li nws tag nrho cov ntim luv dua, ua rau luv dua. Cov khoom yas nyias-phab ntsa nrog cov phab ntsa tuab sib npaug tau txias sai dua hauv qhov pwm, thiab qhov luv luv feem ntau yog qhov me tshaj plaws tom qab demolding. Lub sijhawm ntev dua rau cov khoom yas tuab nrog tib lub phab ntsa tuab kom txias hauv qhov pwm, qhov luv dua tom qab demolding. Yog tias qhov tuab ntawm cov khoom yas txawv, yuav muaj qee qib luv luv tom qab demolding. Yog tias muaj kev hloov pauv sai sai ntawm cov phab ntsa tuab, qhov luv luv kuj tseem yuav hloov pauv sai sai, ua rau muaj kev ntxhov siab sab hauv ntau dua.
Kev ntxhov siab seem hloov pauv. Thaum cov khoom yas raug pwm, vim yog qhov cuam tshuam ntawm kev nias molding thiab lub zog shear, anisotropy, kev sib xyaw tsis sib xws ntawm cov khoom ntxiv thiab qhov kub pwm, muaj kev ntxhov siab seem hauv cov khoom yas pwm, thiab cov kev ntxhov siab seem yuav maj mam me dua thiab rov kis mus, ua rau cov khoom yas luv dua feem ntau hu ua post-shortening.
Lub sijhawm tshaj tawm: Lub Xya Hli-19-2021