Screw Dislocation b Y0z= 2πr Gb T8z=( 2r7 To 0 0 0 0 0 TOz LO TOz 0 [0 0 Toz 岛 0 0 Tyz Txz 0 Gb 2nr Taz =GYa:=- y 2T z2 +y2 Ty:GTy:= Gb z 2元x2+y2Screw Dislocation