Kev txhais ntawm lub zog txwv
Qhov kawg ntawm lub zog yog hais txog qhov siab tshaj plaws uas tshwm sim thaum ib qho khoom raug puas ntsoog raws li kev ua ntawm sab nraud quab yuam. Nws kuj tseem tuaj yeem raug hu ua qhov tsis ua tiav qhov tsis txaus lossis tsis ua haujlwm ntxhov siab. Qhov siab tshaj plaws ntawm ib yam khoom kom tawm tsam qhov kev puas tsuaj sab nraud yog suav sau ua lub zog txwv. Thaum sab nraud quab yuam yog tensile, nws raug hu ua tensile lub zog txwv; thaum nws muaj compressed, nws yog hu ua compressive zog txwv; thaum nws khoov duav, nws hu ua qhov khoov lub zog txwv: thaum nws tau sheared, nws hu ua shear lub zog txwv.