Dab tsi yog elongation thaum tawg

Lub elongation ntawm kev tawg ntawm cov roj hmab hais txog qhov sib piv ntawm qhov ntev uas cov khoom siv roj hmab tuaj yeem txuas mus rau qhov qub ntev nyob rau hauv kev quab yuam stretching. Ntawd yog, qhov siab tshaj plaws uas cov khoom tuaj yeem tiv taus ua ntej nws tawg. Nyob rau hauv layman cov ntsiab lus, lub elongation ntawm so yog hais txog lub degree uas cov khoom siv roj hmab yuav thinner thaum nws yog stretched nyob rau hauv quab yuam kom txog thaum lub thinnest point so. Feem ntau qhia raws li feem pua. Lub elongation ntawm tawg ntawm cov roj hmab yog ib qho tseem ceeb ntawm lub cev khoom uas yuav ntsuas nws elasticity thiab plasticity.

Cov mis laij lej yog: elongation ntawm so=(tawg ntev - thawj qhov ntev) / thawj qhov ntev × 100 feem pua.

Piv txwv li, yog tias cov khoom siv roj hmab tau ncab mus rau 14 cm ntawm qhov ntev ntawm 10 cm thiab cov khoom tawg, qhov elongation ntawm so yog (14-10) / 10 × 100 feem pua ​​=40 feem pua. Ntawd yog, cov khoom siv nce ntev li 40 feem pua ​​​​ntawm kev ncab.