Qhov tsis zoo ntawm txoj kev vuam no yog qhov sab hauv ntawm cov hniav tsis muaj mandrel los txwv qhov radial degree ntawm txoj kev ywj pheej ntawm cov hniav, uas ua rau deformation tom qab kev ntxhov siab tso tawm tom qab vuam, thiab cov khoom raug muab pov tseg.
