–
+
Distant
changes alter curvature cancellation
¥damage: remove bending energy from core region
–central force F decreases
–curvature cancellation is incomplete
–\cancellation † uniform elasticity
Thus: curvature
cancellation results from global constraints.
deform: circular rim¨elliptical rim
Mean curvature varies
along the rim
Becomes negative at
minor axis
r
0
Jin Wang, TW 2009