Txhua yam khoom nyob rau hauv qhov kev txiav txim ntawm kev nce lossis tsis tu ncua ntawm lub zog sab nraud yuav dhau mus dhau ib qho kev txwv thiab raug rhuav tshem. Muaj ntau hom kev quab yuam sab nraud uas ua rau muaj kev puas tsuaj rau cov ntaub ntawv, xws li nro, siab, shear, thiab torsion. Ob lub zog, lub zog tensile thiab lub zog tawm los, tsuas yog rau lub zog tensile.
Ob lub zog no tau txais los ntawm kev ntsuas tensile. Cov khoom siv txuas ntxiv txuas ntxiv ntawm qhov chaw thau khoom kom txog thaum nws tawg, thiab qhov siab tshaj plaws quab yuam nws dais thaum tawg yog qhov kawg tensile load ntawm cov khoom. Qhov kawg tensile load yog ib qho kev qhia ntawm lub zog, thiab chav tsev yog Newton (N). Vim tias Newton yog ib chav me me, feem ntau, kilonewtons (KN) tau siv, thiab qhov kawg tensile load tau muab faib los ntawm cov qauv. Qhov tshwm sim ntawm kev ntxhov siab los ntawm qhov chaw hla ntu ntu yog hu ua lub zog tensile.
Nws sawv cev rau lub peev xwm siab tshaj plaws ntawm cov khoom siv los tiv thaiv kev ua tsis tiav hauv qhov nro. Yog li dab tsi yog yield zog? Lub zog tawm los tsuas yog rau cov ntaub ntawv elastic, cov ntaub ntawv inelastic tsis muaj lub zog tawm los. Piv txwv li, txhua yam khoom siv hlau, yas, roj hmab, thiab lwm yam, txhua yam muaj elasticity thiab yield zog. iav, ceramics, masonry, thiab lwm yam yog feem ntau inflexible, thiab txawm tias cov ntaub ntawv no elastic, lawv yog tsawg. Cov khoom siv elastic yog raug mus rau qhov tas li thiab tsis tu ncua ntxiv dag zog rau sab nraud kom txog thaum nws tawg.
Qhov tseeb tau hloov li cas? Ua ntej, cov khoom siv elastic deformation nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam, uas yog, cov khoom yuav rov qab mus rau nws cov qub loj thiab cov duab tom qab lub sab nraud quab yuam raug tshem tawm. Thaum lub zog sab nraud tseem nce ntxiv thiab nce mus txog ib qho txiaj ntsig, cov khoom siv yuav nkag mus rau lub sijhawm yas deformation. Thaum cov khoom nkag mus rau hauv cov yas deformation, qhov loj me thiab cov duab ntawm cov khoom tsis tuaj yeem rov qab tau thaum lub zog sab nraud raug tshem tawm! Lub zog ntawm cov ntsiab lus tseem ceeb uas ua rau ob hom deformation no yog lub zog tawm los ntawm cov khoom siv. Raws li kev siv lub zog tensile, tus nqi tensile quab yuam ntawm qhov tseem ceeb no yog hu ua qhov taw qhia tawm.
Post lub sij hawm: Sep-23-2022