2. W of a screw dislocation Glb R We=4丌r 3.W of a mixed dislocation bsin a b a G(bsin a) 1 G(b cos a)LlIn( R mIX 4m(1+y) 4丌2. We of a screw dislocation: ln( ) 4 2 e  r Glb R W  = 3. We of a mixed dislocation: l bcos bsin  b   ]ln( ) 4 ( cos ) 4 (1 ) ( sin ) [ 2 2 mix  r G b l G b l R W      + + =